Newsletter - CSIR-Structural Engineering Research Centre

Newsletter
ENGINEERING SUSTAINABLE STRUCTURES
CSIR - SERC
Chennai
Vol.29, No.2
NATIONAL TECHNOLOGY DAY
In this issue
National Technology
Day
CSIR-SERC
Foundation day
General Events
Special Lectures
Deputation
In House Lecture
Invited Lectures
Honours & Awards
New Facilities
Extension of Service
Retirements on
Superannuation
April - June 2014
CSIR - SERC Newsletter
National Technology Day was celebrated on
12th May 2014. Prof. Nagesh R. Iyer, Director,
CSIR-SERC and Coordinating Director, CMC,
presided over this function and in his
presidential address emphasized that challenge
before science today is to make significant
improvement in the technological design &
development with sound and strategic
techniques so as to enable us to compete
globally. He said that the real focus will have to
be on the need to convert our Research and
Development units into innovation creating
institutions. Two lectures were delivered on
“Current Challenges of Futuristic Trends in
Earthquake Simulation in the Laboratory” and
“Technologies for Faster and Affordable Housing
using Cold Formed Steel” by Dr. N.
Gopalakrishnan, Chief Scientist and Dr. G.S.
Palani, Senior Principal Scientist, CSIR-SERC
respectively.
Jorhat, CSIR – IICT Hyderabad, CSIR – CLRI
Chennai, Former Commonwealth Science
Diplomat, London was the Chief Guest and
delivered the Prof. G.S. Ramaswamy Memorial
Lecture on "Science Diplomacy: A Rich option
for India's International Relations”. Director
gave away Certificates of Appreciation and cash
awards to different categories of employees of
CSIR – SERC & CMC for achieving Excellence in
Director felicitating the Chief Guest of the
CSIR-SERC Foundation Day
Editorial Board
C. Jeyabal,
Chief Scientist & Head,
Knowledge Management
Division
K. Gunasekaran,
Principal Scientist,
Research Planning &
Business Development
S. Vijayalakshmi,
Nodal Officer,
Knowledge Network Unit
M. Sangeetha,
Special Assistant
Dignitaries on the dais of the National Technology Day
Chief Guest Prof. Surendra P. Shah, Professor Emeritus,
Northwestern University delivering the
Prof. G.S. Ramaswamy Memorial Lecture
CSIR-SERC FOUNDATION DAY
Business Development. He also felicitated the
octogenarian members of the CSIR family with
Citation and silver plaque. The Director
mentioned that CSIR-SERC had entered into its
Golden Jubilee year and the lecture by Dr. G.
Thyagarajan has set the ball rolling for the
The CSIR-SERC Foundation Day was celebrated
on 10th June 2014. The function was presided
over by Dr. Nagesh R. Iyer, Director, CSIR-SERC
and Coordinating Director, CMC, Chennai. Dr. G.
Thyagarajan, Former Director, CSIR – NEIST
CSIR - SERC Newsletter
April - June 2014
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CSIR - SERC Chennai
Golden Jubilee year celebrations. Shri C. Jeyabal, Chief
Scientist & Head, KMD delivered the Vote of Thanks.
3.
Prof. G.S. Ramaswamy Memorial Lecture was delivered by
Prof. Surendra P. Shah, Professor Emeritus, Northwestern
University, Illinois, USA on “Advancements Made during the
Past Decades in Concrete Technology” on 16.6.2014.
Ms. Prameetthaa, QHS Trainee attended the
International Conference on Advances in Sustainability
of Materials and Environment held at St Xavier's Catholic
College of Engineering, Nagercoil during 10-11 April,
2014.
4.
MoU was signed between CSIR-Structural Engineering
Research Centre, Chennai and Vignan's Foundation for
Science Technology and Research, Vadlamudi on April 23,
2014.
Shri G V Ananthakrishnan, Technical Assistant attended
the IPv6 workshop organized by ERNET India held at
Indian Institute of Technology, Chennai on 2nd May,
2014.
5.
Dr. K Muthumani, Dr. G Raghava & Dr. J. Rajasankar,
Chief Scientists attended the Theme Meeting on
Shielding and Criticality Aspects in Nuclear Fuel Cycle
Facilities Challenges and Future directions held at
IGCAR, Kalpakkam during 5-6 May, 2014.
6.
Mrs. P. Prabha, Scientist and Mrs B. Bhuvaneshwari,
Senior Project Fellow attended the Second International
Conference on Innovations in Civil Engineering held at
SCMS School of Engineering and Technology during 8-9
May, 2014.
7.
Dr S Vishnuvardhan, Scientist attended the 1st Annual
conference on Innovations and Developments in Civil
Engineering held at National Institute of Technology,
Surathkal, Karnataka during 19-20 May, 2014.
8.
Shri J Prawin and Shri T Jothi Saravanan, AcSIR
Students attended the International conference on
Advances in Engineering and Technology held at Indian
Institute of Technology, Roorkee during 24-25 May,
2014.
9.
Dr. K Rama Raju, Chief Scientist and Shri G V Rama Rao,
Scientist attended the Indo-Norwegian training
programme on Seismic design of Multi-storey building:
IS 1893 vs Eurocode held at India Habitat Centre, New
Delhi, during 26-28 May, 2014.
GENERAL EVENTS
MoU was signed between CSIR-Structural Engineering
Research Centre, Chennai and Mangalayatan university,
Beswan (Aligarh) on June 6, 2014.
In Plant training was organized for second & third year
students of B.E/B.Tech (Civil Engineering) from 02.06.2014 to
20.06.2014. Around 35 students attended this training
programme from different universities/colleges/institutions.
SPECIAL LECTURES
Prof. Ohama Yoshihiko Delivered a Special Lecture
Prof. Ohama Yoshihiko delivered a Special Lecture on “Recent
Developments in Concrete Polymer Composite in Japan” on
th
8 March 2014.
10. Shri C. Jeyabal, Chief Scientist attended the 71st
Residential Training Programme on the New
Reservation Policy of Govt. of India conducted by
Institute of Public Administration at Faridabad, New
Delhi during 29-31 May, 2014.
Prof. S.P. Shah, Northwestern University, USA delivered a
Special Lecture on “Nanotechnology in Civil Engineering
th
Application” on 15 May 2014.
11. Dr A Hariharan, Principal Technical Officer and Dr M
Mymoon, Senior Technical Officer attended Proquest
Day Event, Chennai on 11th June, 2014.
DEPUTATION
India
1.
Mrs. K. Sasikala, Senior Technical Officer attended the
National Workshop on cloud application testing held at
VIT Chennai campus, Chennai on 5th April, 2014.
2.
Ms. A Thirumalaiselvi, QHS Trainee attended the Second
International Conference on Innovations in Civil
Engineering held at SCMS School of Engineering and
Technology during 8-9 April, 2014.
12. Shri A Abraham, Senior Scientist attended the
International Conference & Expo on Renewable Energy
held at Trade Centre, Chennai during 12-14 June, 2014.
13. Shri T M. Muhammed Majaz, Assistant (F&A) Gr. I
attended Induction Training Programme for Assistants
Grade I recruited under combined Administrative
Services Examination-2013 held at HRDC, Ghaziabad
during 23 June 2014 to 25 July 2014.
(Contd. on page 7)
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April - June 2014
Seismic Behaviour of Cold Formed Steel Self-drilling Screw Beam-Column Connections
The usage of cold-formed steel (CFS) sections in building construction has picked up momentum, as they result in
faster and light weight construction. In view of these, the construction cost is considerably reduced. The buildings
made of CFS sections can be used effectively during natural disasters such as cyclone and earthquake, which
need buildings and structures for immediate occupancy for victims and other logistical requirements for
post-disaster mitigation. In general, it is known that CFS structures exhibit brittle failure and they are classified as
slender sections by different codes of practices all over the world. Hence, the applicability of buildings and
structures made up of CFS structural members needs to be evaluated. The state-of-the-art reviews on CFS
structural components cover mainly on the static behavior and very little studies have been reported at component
level behavior, especially for seismic applications. Hence, design guidelines and technology is to be developed,
which could be used for design of easily erectable light weight seismic resistant CFS buildings. In the present study,
the cyclic behavior of CFS structural sub-assemblage has been highlighted.
A new beam-column connection has been developed
by using self-drilling screws through gusset plates. The
CFS members are thin and the screws are weak against
pulling out action. However, the self-drilling screws are
efficient in transferring shear forces and hence the
beam end forces can be transferred as shear force
through gusset plates. The screws are available with
different configurations depending upon the usage
(Fig.1). These connections are simple to install without
skilled supervision; predrilled holes, site welding, etc. A
comparative study on the guidelines for evaluation of
strength as per the commonly used codes such as AISI,
Fig. 1 Self-drilling screws
AS/NZS, BS-Eurocode, Canadian code and
IS:801-draft has been conducted and results are compared with the respective experimental values available in the
literature.
In general, the self-drilling screws are used for joining
roofing/cladding sheets to the underlying thick
members and hence the screw head is always in
contact with the thin sheet. Whereas, in the present
study, the screw head is in contact with thick gusset
plate, for which no guidelines are available. In order to
evaluate the codal equations for the present condition,
experiments on single screw lap joints have been
conducted for three different sheet combinations. In
each case, the screw head is in contact with thicker
sheet, which represents the gusset plate. Each
specimen is instrumented with strain gauges at critical
Fig. 2 Failure mode of lap joints
locations of bearing and in the expected path of the net
section rupture in each sheet. The specimens are tested under 25 Ton UTM. The specimens failed by bearing,
bearing-tilting and screw shearing modes as shown in Fig. 2. The estimated ultimate load of all specimens as per
IS: 801-draft code closely matches with the corresponding experimental value. From the studies, it is found that the
IS:801-draft provisions can be used for evaluating the strength of the self-drilling screw joint, in which the screw
head is in contact with thick sheet.
The present study has been extended towards understanding the beahviour of CFS beam-column self-drilling
screw joints. In order to design the beam, column and connection elements, a two bay single storey residential
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frame has been analysed for dead, live, wind, earthquake load and their combinations as per relevant IS codes.
Based on the analysis results, lipped channel cross-sections have been designed for beam and column by
considering buckling modes such as local, distortional and overall buckling. The larger value of lip depth has been
chosen for accommodating the screw with adequate end distances. A double cantilever model of the interior joint
has been studied experimentally under monotonic loading. The ends of the beam setup have been supported by
roller and hinge assembly and these beams are centrally connected with a stub column. The specimen has been
instrumented with strain gauges and LVDTs. The strains and displacements are recorded automatically during the
test by using a data logger. The test has been conducted under displacement controlled mode. Fig. 3 shows the
experimental set up of the beam-column joint specimen.
Fig. 3 View of the experimental set-up
Fig. 4 Moment–rotation behaviour
The stiffness of the initial linear portion is 1800 kNm/radian. Since, the beam and column are open channel sections
with single symmetry and loaded at the center of gravity of the column, the tendency of the specimen is to twist
about its shear center leading to stiffness reduction by about 80%. The specimens failed at an ultimate moment of
11.6 kNm with gusset plate buckling and support instability as shown in Fig. 4. From the experiment, it is found that
none of the screw has undergone bearing, tilting and their combination modes. The double cantilever connection
model is not representing the reversed nature of beam forces and hence the panel zone action is not observed in
the moment-rotation behavior. Hence, the studies are performed with full scale sub-assemblage of the
beam-column joint. An exterior beam column joint has been designed as per IS: 801-draft code. The height of the
Fig. 5 Beam-column joint specimen
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April - June 2014
column is taken as 3000 mm. The beam length has been chosen based on the available experimental facility in the
laboratory. The beam length is taken as 1700 mm. The view of the specimen and the schematic view of the
experimental set up is shown in Fig. 5. The specimen is subjected to point load at free end of the beam. The top and
bottom of the column set-up have been supported by hinge support to simulate the point of contra-flexure at the
mid-height of the columns above and below the joint and these beams are centrally connected with the column. The
experiment has been conducted under displacement control mode. With the above details, FE model has also
been developed by employing shell element. Since, no deformation near the screw points is observed during the
double cantilever model experiment, the screws are simulated by using tie constraints.
The moment-rotation behaviour of the specimen is compared with that of the experiment for 10 mm gap as shown in
Fig. 6. It is found that finite element analysis (FEA) results and failure modes are closer to those obtained through
experiment as shown in Fig. 7. Having validated the FE model, it is further extended for parametric studies. From
the experiment and FEA results, it is found that the joint retained about 50% of the ultimate moment capacity after
gusset buckling. In order to enhance the moment capacity after ultimate, FEA is further continued by providing
lateral restraints in the beam. It is observed that the moment capacity of the joint improved by about 1.45 and 1.7
times to that of the design bending strength of the beam respectively for 3 and 4 mm thick gusset plates. However,
after buckling, the FE model with 3 mm gusset plate retains about 80% of design moment capacity at a rotation of
about 0.06 radians. From these studies, it is observed that the CFS beam-column joint with gusseted connection
exhibits stable behaviour, which is contrary to the results reported in the literature that the CFS components and
systems results in brittle mode of behaviour. In addition, it is reported that the response reduction factor for these
type of frames is generally taken in the range of 1.5 to 2 for seismic resistance. Hence, the results of FE model
needs to be validated through experiments under cyclic loading towards development of necessary guidelines.
Fig. 6 Moment rotation behavior of full-scale joint
Fig. 7 Comparison of failure modes
In continuation with FEA of CFS beam-column self-drilling screw connections under monotonic loading,
experimental studies under cyclic loading have been conducted by varying the gusset plate thickness as
3 and 4 mm. The length of the beam and column are 1250 mm and 2500 mm respectively. The gusset plate is joined
with beam by using 6 nos. of screws in each lip, totaling 24 nos. The column side has been provided each 7 nos. of
screws totaling 28 nos. in a line. The specimen is instrumented with strain gauges at different critical locations like,
regions of the beam and column near gusset plates and on the gusset plate. An axial load of 60 kN is applied on the
column centroid to simulate the dead and live loads. The alternating load at the beam end is applied as cyclic load
as per the provisions of ANSI/AISC 341-10. The restraining effect provided by the secondary beams of the slab and
the cladding in the wall panels in the out-of-plane are simulated by providing appropriate restraining channels in the
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beam and columns. Both the specimens exhibited pinching effect. The specimen with 4 mm thick gusset plate
failed by screw tilting and shearing in the column and the 3 mm gusseted specimen failed by gusset plate buckling
as shown in Figs. 9 and 10 respectively. FE models have also been developed for conducting analytical studies.
The hysteresis curves and failure modes obtained from FEA have been compared (Fig. 11). The failure mode and
hysteresis curve obtained from FEA closely matches with experiment. However, pinching is not observed in FEA.
Further, refinement of FE model and parametric studies are in progress.
Fig. 8 Experimental set-up
Fig. 9 Screw tilting and shearing in 4 mm thick gusset
Fig. 10 Buckling of 3 mm thick gusset
Fig. 11 Hysteresis curve of 3 mm gusset specimen
For more details, please contact :
Director
CSIR – Structural Engineering Research Centre
(Council of Scientific and Industrial Research),
CSIR Campus, Taramani, Chennai - 600 113.
Phone : +91-44-22549200/22542139/22549151 E-mail : [email protected] Web : www.serc.res.in
CSIR - SERC Newsletter
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April - June 2014
Engineering and Technology, Chittor, Andhra Pradesh, April
2014.
IN HOUSE LECTURE
09.04.2014 : Dr. T. Hemalatha, Scientist - Determination of
back boundary effect on self compacting concrete beams – A
trilinear and bilinear approach and Ms. K. Sarayu, Q.H.S. Exploration on the bio-technology aspect of the urological
bacterial for the production of the cementicious material – A
review.
23.04.2014 : Ms. C. Bharathi Priya, Scientist - Mass loading,
boundary condition and crack closure effects on impedance
based damage identification and Ms. Maitri Mapa, Q.H.S. Photo catalyst in cement: A multipurpose application towards
sustainability.
07.05.2014 : Shri K. Kesavan, Principal Scientist - Fiber bragg
grating sensors for monitoring corrosion of reinforcement in
concrete structures and Shri M. Saravanan, Scientist Fracture studies on carbon steel elbows having part-through
notch with and without internal pressure.
28.05.2014 : Shri V. Bhashya, Scientist - Long term studies on
FRP strengthened concrete specimens.
04.06.2014 : Shri Mohit Verma, Scientist – (i) Numerical
Assessment of the time integration methods in the paradigm
of real-time hybrid testing and (ii) Support vector regression
model for the prediction of cement compressive strength.
11.06.2014 : Dr. R.Manisekar, Senior Scientist - Distressed
concrete bridges in India – problems and solutions and Smt.
B.S. Sindu, Scientist - Evaluation of mechanical
characteristics of nano modified epoxy based polymers using
molecular dynamics.
18.06.2014 : Shri Mohit Verma, Scientist - Fuzzy similarity
approach for health assessment and ranking of towers based
on visual inspection and Ms. K. Balamonica, QHS - Seismic
response evaluation under multi support excitation using POD
modes.
25.06.2014 : Ms. J. Prameetthaa, QHS - Investigations on
micronized biomass silica as sustainable material and Ms. A.
Thirumalai Selvi, QHS - Determination of large deformation
capacity of laced steel concrete composite (LSCC) beams by
finite element analysis.
Dr. J. Rajasankar, Chief Scientist delivered a guest lecture on
"Basics of finite element analysis of structures" at SA
Engineering College, Chennai on April 3, 2014.
Dr. K. Muthumani, Chief Scientist has delivered a key note
address on “Application of smart materials for seismic
response control”, International Conference on Emerging
Materials & Applications, held at Indian Institute of
Technology Roorkee, Saharanpur Campus, Saharanpur, UP
on April 5, 2014.
Shri P. Gandhi, Senior Principal Scientist delivered a keynote
address on “Fatigue in offshore structures”, in the National
Seminar on Fatigue in Structures held at D.N.R. College of
Engineering & Technology, Bhimavaram on April 5, 2014.
Dr. P. Sivakumar, Chief Scientist delivered a Keynote address
on “Genetic Algorithm for Structural Optimisation (An
Engineering Application) in the National conference on Pure
and Applied Mathematics 2014 (NCPAM '14) held at VIT
University, Chennai Campus, on April 25, 2014.
Dr. K. Balaji Rao, Chief Scientist delivered an invited lecture on
'Performance-based design of RC structures for achieving
sustainability' at BMS College of Engineering, Bangalore, on
May 9, 2014.
Dr. K. Balaji Rao, Chief Scientist delivered an invited lectures
on 'Distribution of asset prices' and 'Stochastic modelling for
financial crashes' at the Game Theory Lab, Department of
CSA, Indian Institute of Science, Bangalore, during May 1011, 2014.
Dr. G.S. Palani, Senior Principal Scientist delivered an invited
lecture on “Investigations on performance evaluation of
parallel flange sections for specified load”, at the workshop
organized by M/s Jindal Steel and Power Ltd., on June 18,
2014 held at Taj Surya, Coimbatore.
HONOURS & AWARDS
Paper on "Meso-scale Approach for modelling Concrete under
Compression" authored by Shri K.S. Swaminathan, Dr. N.
Anandavalli, Shri S. Surender and Dr. J. Rajasankar has been
chosen as "Best Paper" for the stream CIVIL and S&H at the
International Conference on Emerging Trends in Science,
Engineering and Technology (ICETSET-2014) held at
Jerusalem College of Engineering, Chennai, April 18-19,
2014.
INVITED LECTURES
Dr. K. Muthumani, Chief Scientist delivered a key note Lecture
on “Seismic response control for framed structures' in the
National Conference on Frontier Applications in Civil and
Environmental Engineering, held at Coimbatore Institute of
Technology, Coimbatore on March 25, 2014.
Dr. V. Srinivas, Principal Scientist delivered an invited lecture
on “Performance evaluation and Health Monitoring of
Structures”, during workshop on Advance Technologies in
Civil Engineering, organized by Sri Venkateswara College of
CSIR - SERC Newsletter
The paper titled "Experimental studies on hybrid beam
reinforced with steel and BFRP bar" authored by Shri P.
Nachiappan, Smt. Smitha Gopinath, Dr. A. Ramachandra
Murthy, Prof. Nagesh R. Iyer, Ms. T. Manju, won the
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April - June 2014
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CSIR - SERC Chennai
"Best Paper Award" in the International onference on
Emerging Trends Science, Engineering and Technology
(ICETSET-2014), April 18-19, 2014, Jerusalem College of
Engineering, Chennai, pp. 235-237.
Dr. P. Sivakumar, Chief Scientist was the Chief Guest in the
National conference on Pure and Applied Mathematics 2014
(NCPAM '14) at VIT University, Chennai Campus, on April 25,
2014.
Ms. H. Aysha, Smt. T. Hemalatha, Shri N. Arunachalam, Dr. A.
Ramachandra Murthy and Prof. Nagesh R Iyer, authored
paper entitled, 'Assessment of Embodied Energy in the
Production of Ultra High Performance Concrete (UHPC)'
received the best paper award in the International Conference
on Sustainable Technology & Development Conference - 2014
(STDC 2014), Ministry of Manpower Sultanate of Oman, Al
Musanna College of Technology, April 2014.
View of newly installed hydraulic power packs in FFL
Instrumented Impact Test Facility
Instrumented Impact test facility is created in the basement of
the ASTAR laboratory. Impact testing machine CEAST 9350 is
installed. CEAST 9350 is a floor standing impact system
designed to deliver 0.59-757 J or up to 1,800 J with optional
high energy system. CEAST 9350 works with the impact
software and data acquisition system to make analysis simple.
This versatile instrument can be used to test anything from
composites to finished products, and is suitable for a range of
impact applications including tensile impact, puncture, Izod,
and Charpy.
Ms. G. Jenitha, Shri M. Saravanan, Dr. S. Vishnuvardhan and
Prof. V. Naresh Babu authored technical paper titled
'Evaluation of cyclic hardening variables for Type 304LN
stainless steel' presented in the National Conference on
Futuristic Innovations & Emerging Trends in Civil Engineering
held at B.S. Abdur Rahman University, Chennai, during May 56, 2014 has been adjuded as the best paper.
Dr. K. Balaji Rao has been invited as a Reviewer for the R&D
Review Meeting of the Civil Engineering Department, Vel Tech
Dr RR & Dr SR Technical University, Chennai held on May 18,
2014.
Impact testing machines are used to characterize the impact
performance of various materials and components. Impact
tests on structural elements like beams, slabs, made of RCC,
steel and composites can be carried out in the instrumented
impact test facility. In addition to this, characterization of
materials at high strain rate can be performed with the help of
the facility. These tests will indicate the energy absorbing
capacities of materials and failure pattern under impulsive
loads.
Shri Mohit Verma was awarded the Fulbright-Nehru Doctoral
and Professional Research Fellowship, 2013-2014 from
August 18, 2013 to May 17, 2014 at University of Buffalo, The
State University of New York, Buffalo, New York.
Dr. G. Raghava has been nominated as a Member of the
Divisional Scientific Committee of Structural Technologies
Division, CSIR - National Aerospace Laboratories, Bengaluru.
Hydraulic Power Packs
Three numbers of hydraulic power packs of 170 lpm capacity
each have been installed and commissioned in the laboratory.
The room hosting hydraulic power packs has also been
expanded.
NEW FACILITIES
The hydraulic hard line piping in the Fatigue & Fracture
Laboratory has been completely relaid. New hydraulic hard line
piping of 210 bar operating pressure and 600 lpm flow with inline hydraulic accumulators has been installed and
commissioned.
EXTENSION OF SERVICE
Dr. K. Ravisankar, Chief Scientist Extension of Service for two
years beyond the age of superannuation i.e. on 30.04.2014.
Shrinkage test facility for mortar and concrete: Shrinkage
moulds for the determination of hydraulic axial shrinkage of
concrete specimens and mortar prisms; shrinkage measuring
device/length comparator are installed and commissioned for
shrinkage studies.
RETIREMENTS ON SUPERANNUATION
Shri K. Ethirajalu, Senior Technician(3), 30.06.2014 Retirement on superannuation.
This quarterly Newsletter is published by CSIR - Structural Engineering Research Centre, CSIR Campus, Taramani, Chennai - 600 113.
Ph. : 22549200, Fax : 22541508 and Printed at Hindi Prachar Press, Chennai - 600 017. Ph.: 24341244
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April - June 2014

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