Wind tunnel Testing of Long Span Cable-Stayed Bridge Models
M. Keerthana
S. Selvi Rajan
P. Harikrishna
G. Ramesh Babu
A. Abraham
Scientist CSIR-SERC, Chennai TN, India
Chief Scientist CSIR-SERC, Chennai TN, India sselvi@serc.res.in
Sr. Principal Scientist CSIR-SERC, Chennai TN, India hari@serc.res.in
Civil Engineering from SVU College of Engineering, Tirupati
Sr. Scientist CSIR-SERC, Chennai TN, India abraham@serc. res.in
Dr. S. Selvi Rajan obtained her Bachelor’s degree in Civil Engineering from IIT-Madras, Master’s degree in Hydraulics and Water Resources from Anna University, Chennai and Ph.D. in Structural Engineering from Anna University, Chennai. She is currently working as Chief Scientist and Head, Wind Engineering Laboratory at CSIRSERC. She is member of many professional societies and BIS codal committees.
Dr. P. Harikrishna obtained his Bachelor’s degree in Civil Engineering from Andhra University, Master’s degree in Structural Engineering from Anna University, Chennai and Ph.D.in Structural Engineering from IIT-Madras. He is currently working as Senior Principal Scientist at CSIRSERC. He is member of many professional societies and BIS codal committees
G. Ramesh Babu obtained his Bachelor’s degree in Civil Engineering from SVU College of Engineering, Tirupati, Master’s degree in Structural Engineering from J.N.T.U College of Engineering, Anantapur. He is pursuing his Ph.D. at IIT-Madras. He is currently working as Principal Scientist at CSIR-SERC. He is member of many professional societies and BIS codal committees.
A. Abraham obtained his Bachelor’s degree in Civil Engineering from Coimbatore Institute of Technology, Coimbatore and Master’s degree in Structural Engineering from Anna University, Chennai. He is pursuing his Ph.D.in Structural Engineering from Anna University, Chennai. He is currently working as Senior Scientist at CSIR-SERC.
keerthana@serc.res.in
M. Keerthana obtained her Bachelor’s degree in Civil Engineering from College of Engineering, Guindy, Anna University, Chennai and Master’s degree in Engineering of Structures from Academy of Scientific and Innovative Research (AcSIR). She is pursuing her Ph.D. in AcSIR. She is currently working as Scientist at CSIRSERC.
Summary Wind tunnel experiments have been conducted on scaled rigid sectional model of four different bridge decks having different cross-sectional shapes/ configurations. The models were subjected to three different wind speeds of about 8, 11 and 13.5 m/s, measured at the height of the bridge deck level. The deck was rotated and tested for 0º, ±3º, ±6º, ±9º, ±12º and ±15º angles of wind attack, for simultaneous measurement of force and pressure. The acquired force and pressure data from the static sectional models were further analysed for each of the tested angles between -15º and +15º. The maximum of mean drag, lift and moment coefficients for the four bridge deck configurations under study was found. Based on Glauert-Den Hartog criterion, aerodynamic stability of the cross sections of the bridge decks investigated was assessed and all the deck sections studied were
The Bridge and Structural Engineer
S. Chitra Ganapathi Civil Engineering from GCE, Salem chitrag@serc.res.in S. Chitra Ganapathi obtained her Bachelor’s degree in Civil Engineering from GCE, Salem and Master’s degree in Structural Engineering from KCE, Coimbatore. She is currently working as Scientist at CSIR-SERC. She is pursuing her Ph.D. at IIT-Madras
found to be aerodynamically stable around 0º angle of wind attack.
1.
Introduction
Bridges are an indispensable part of civil infrastructure. Construction of bridges has an enormous impact on economy and the environment. Recently, cable-stayed bridges have been adopted in increasing numbers in India owing to numerous advantages offered by them. These have high structural stiffness and are economical for bridges of medium to long-span. Wind loads are one of the important loads that govern the design of such bridges. The well-known collapse of Tacoma Narrows Bridge in 1940 clearly underlined the importance of wind loading effects on the performance of long-span bridges. Hence, aerodynamic studies have become an indispensable part of the structural design process of bridges([1], [2], [3]). Volume 47 │ Number 4 │ December, 2017
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