BIOGRAPHY:Graduated in the year of 1988 in Civil Engineering from Bengal Engineering College, then affiliated to University of Calcutta, India, Dr. Dutta, completed his Masters in Structural Engineering in 1990 from the same university. Subsequently he received his Ph.D. from IIT Kanpur, India in 1996. He served Bengal Engineering and Science University as Lecturer in Civil Engineering and Assistant Professor of Applied Mechanics. He is currently a Professor in the Department of Civil Engineering in the same University since July, 2004.
Dr. Dutta is actively involved in research in the area of earthquake engineering, soil-structure interaction, dynamic behaviour of earthen embankment and behaviour of concrete under cyclic loading. Dr. Dutta has published about 38 papers in various international and national journals (such as Journal of Structural Engineering, ASCE; Engineering Structures, Sound and Vibration, Soil Dynamics and Earthquake Engineering, Building and Environment of Elsevier Science Ltd., European Earthquake Engineering etc.) and about 55 papers in various international and national conferences to his credit. His contributions reflected on simulating the complex behaviour of R/C members under reversible loading, contradicting the prevailing perception as regard to the influence of soil-structure interaction, developing improved design guidelines for elevated water tanks and so on.
This apart, he has also carried out a number of research projects under Board of Research in Nuclear Science (BRNS), University Grants Commission (UGC), Department of Science and Technology (DST), Council for Scientific and Industrial Research (CSIR) etc. So far, he has supervised three doctoral theses while some are under progress. His contribution has recently been recognized in a state-of the art survey by Prof. W. K. Tso and Prof. A. V. Rutenberg, living legends in the area of earthquake engineering as available in http:// bled2004.ikpir.com / papers / rutenberg-tso.pdf. He has been granted a research funding under prestigious Young Scientist Scheme of Department of Science and Technology, Government of India in 1998. He has received Arthur Cotton Memorial Medal from Institution of Engineers (India) for best paper in Civil Engineering Division Journal of the Institution. He has also been awarded National Science Day Award in the year 2002 for his significant contribution in the arena of Science and Technology, by Science Association of Bengal. He has acted as reviewer of many international journals like Earthquake Spectra of EERI, Cal. Tech.; Computers and Structures, Engineering Structures, Journal of Sound and Vibration and Soil Dynamics and Earthquake Engineering of Elsevier Science Limited; Structural Engineering and Mechanics of Techno Press, Korea. He has delivered many invited lectures and participated in Radio and TV programme for popularizing the philosophy of earthquake resistant structure design all over India. He has been recognized as the State Resource Person under National Programme for Capacity Building of Engineers in Earthquake Risk Management launched by Ministry of Home Affairs, Government of India and involved in dissemination of knowledge related to earthquake-resistant design.
AWARD WINING PUBLICATION(S):
A. TITLE OF THE RESEARCH PUBLICATION: Seismic Behaviour of Code-Designed Bi-Directionally Eccentric Systems.
PUBLISHING JOURNAL: Journal of Structural Engineering, ASCE, October, 2005, pp 1497-1514.
CO-AUTHOR(S):
S. C. Dutta, Professor,
Dept. of Civil Engg., Bengal Engg. College (D.U.), Howrah 711 103, West Bengal, India.
P. K. Das,Senior Lecturer,
Mechanical Sciences, Academy of Technology, AEDCO Nagar, Hooghly 712 121, West Bengal, India.
R. Roy, Lecturer,
Dept. of Applied Mechanics, Bengal Engg. College (D.U.), Howrah 711 103, West Bengal, India
ABSTRACT OF THE PUBLICATION: Extreme seismic vulnerability of bidirectionally eccentric structural systems such as street corner buildings has been demonstrated repeatedly during past severe earthquakes. Inelastic range response of such structural systems may vary considerably depending upon the sense of eccentricities regulated by relative quadrant wise position of center of stiffness with respect to center of mass particularly for reinforced concrete (RC) structures with strength and stiffness degrading behavior. Recognizing the same, an effort has been made in the present paper to analyze the inelastic range response of bidirectionally asymmetric structures designed as per the existing codal standards. Such response helps to perceive the adequacy of the code provisions to minimize the progressively damaging effects expected to arise in RC bidirectionally eccentric structural systems due to strength and stiffness degradation under severe seismic excitation. The effect of change in stiffness eccentricity due to cracking of reinforced concrete members is also attempted to be studied in the limited form. Inelastic seismic response of code-designed bidirectionally eccentric structural systems with only strength deteriorating and only stiffness degrading structural elements are also investigated to examine the potential of such comparatively simpler hysteresis models. Effort has also been made toward assessing the response of similar elastoplastic structural systems. The study clearly indicates the limitation of the design code provisions to take adequate care of seismic torsional vulnerability of bidirectionally eccentric structures made up of strength and stiffness degrading RC structural elements. However, the performance of the same seems satisfactory for elastoplastic structural systems.
B. TITLE OF THE RESEARCH PUBLICATION: Effect of Strength Deterioration on Inelastic Seismic Torsional Behaviour of Asymmetric RC Buildings.
PUBLISHING JOURNAL:Building and Environment, 2001, Elsevier,Vol. 36, No. 10, pp. 1109-1118.
CO-AUTHOR(S):
S. C. Dutta, Professor,
Dept. of Applied Mechanics, Bengal Engg. College (D.U.), Howrah 711 103, West Bengal, India.
ABSTRACT OF THE PUBLICATION: The paper presents a limited study on the inelastic torsional behaviour of reinforced concrete (RC) asymmetric buildings using idealized one-storey models. The strength deterioration characteristics of reinforced concrete members are included in the hysteresis rules of the load-resisting elements in this study. It is observed that these characteristics may largely magnify the displacement and ductility demand in structural elements due to successive localized unsymmetrical yielding and progressive strength deterioration; resulting in continuous shifting of the centre of strength and thereby increasing strength eccentricity. This magnification effect is generally found to be increasing with the rate of strength deterioration. This effect is not recognized in numerous studies on inelastic behaviour of asymmetric buildings as these studies considered a bilinear hysteresis behaviour devoid of strength deterioration characteristics for lateral load-resisting elements; and as a consequence comparatively lower displacement and ductility demand in load-resisting elements were observed. While using the results of existing literature on inelastic seismic torsional behaviour of asymmetric buildings to predict the behaviour of RC asymmetric buildings, this limitation should seriously be considered.
C. TITLE OF THE RESEARCH PUBLICATION: Response of Low-Rise Buildings under Seismic Ground Excitation Incorporating Soil-Structure Interaction.
PUBLISHING JOURNAL: Soil Dynamics and Earthquake Engineering, 2004, Elsevier, Vol. 24, pp.893-914
CO-AUTHOR(S):
S. C. Dutta, Professor,
Dept. of Civil Engg., Bengal Engg. College (D.U.), Howrah 711 103, West Bengal, India.
K. Bhattacharya,
Dept. of Civil Engg., Bengal Engg. College (D.U.), Howrah 711 103, West Bengal, India.
R. Roy, Lecturer,
Dept. of Applied Mechanics, Bengal Engg. College (D.U.), Howrah 711 103, West Bengal, India
ABSTRACT OF THE PUBLICATION:In the conventional design, buildings are generally considered to be fixed at their bases. In reality, flexibility of the supporting soil medium allows some movement of the foundation. This decreases the overall stiffness of the building frames resulting in a subsequent increase in the natural periods of the system and the overall response is altered. The present study considers low-rise building frames resting on shallow foundations, viz. isolated and grid foundation. Influence of soil–structure interaction on elastic and inelastic range responses of such building frames due to seismic excitations has been examined in details. Representative acceleration–time histories such as artificially generated earthquake history compatible with design spectrum, ground motion recorded during real earthquake and idealized near-fault ground motion, have been used to analyze the response. Variation in response due to different influential parameters regulating the effect of soil-flexibility is presented and interpreted physically. The study shows that the effect of soil–structure interaction may considerably increase such response at least for low-rise stiff structural system.
D. TITLE OF THE RESEARCH PUBLICATION: Validity and Applicability of Two Simple Hysteresis Models to Assess Progressive Seismic Damage in R/C Asymmetric Buildings.
PUBLISHING JOURNAL:Journal of Sound and Vibration, 2002, Elsevier, Vol. 257, No. 4, pp. 753-777.
CO-AUTHOR(S):
S. C. Dutta,
Dept. of Applied Mechanics, Bengal Engg. College (D.U.), Howrah 711 103, West Bengal, India
P. K. Das,
Dept. of Applied Mechanics, Bengal Engg. College (D.U.), Howrah 711 103, West Bengal, India
ABSTRACT OF THE PUBLICATION: The coupled lateral-torsional vibration in R/C asymmetric structures under seismic loading leads to larger lateral deformation in the load-resisting elements located at one edge, compared to the other resisting elements. This may cause earlier yielding of the elements of that edge in localized form. Strength and stiffness degradation due to successive inelastic excursions of these R/C structural elements at one edge may make these elements more flexible and weaker as compared to those at the opposite edge. This may cause progressive shifting of stiffness and strength centres away from this flexible edge, leading to consequent increase of effective eccentricity in successive loading cycles. This, in turn, causes a progressive increase in torsional effect in R/C structures. This damaging effect cannot be predicted by using the bilinear hysteresis models devoid of degradation characteristics. Existing sophisticated hysteresis models representing the degrading behaviour of the R/C structural load-resisting elements require a number of parameters to be specified, the evaluation of which requires extremely case-specific calibration study. In this context, the present paper studies the suitability of two alternative simplified hysteresis models, which are capable of predicting the strength and stiffness degrading behaviours with simple input parameters. Responses of idealized asymmetric R/C building systems are studied using these two hysteresis models under design spectrum-consistent synthetic ground motions and idealized near-fault ground motions. The comparison between the responses of the R/C asymmetric structures with deteriorating structural elements and the similar structures having elasto-plastic structural elements proves the suitability of the proposed models in recognizing the progressive damaging effect of torsion in R/C asymmetric buildings.
E. TITLE OF THE RESEARCH PUBLICATION: Inelastic Seismic Response of Code-Designed Reinforced Concrete Asymmetric Buildings with Strength Degradation.
PUBLISHING JOURNAL: Engineering Structures, 2002, Elsevier, Vol. 24, No. 10, pp. 1295-1314.
CO-AUTHOR(S):
S. C. Dutta,
Dept. of Applied Mechanics, Bengal Engg. College (D.U.), Howrah 711 103, West Bengal, India
P. K. Das,
Dept. of Applied Mechanics, Bengal Engg. College (D.U.), Howrah 711 103, West Bengal, India
ABSTRACT OF THE PUBLICATION: The study presents the inelastic seismic response of code-designed asymmetric buildings idealized as asymmetric one storey systems. The strength eccentricity of the code-designed buildings is studied and accordingly, the strength of various load-resisting elements of the idealized asymmetric systems are adjusted in such a way that these systems have the strength eccentricities similar to those of the code designed buildings. Two categories of systems are studied. The first category has lateral load-resisting structural elements with ideal elasto-plastic hysteresis behaviour. The load-resisting elements of the other category have strength-deteriorating characteristics representing the deterioration in yield strength of structural elements, which are known to arise in reinforced concrete (RC) members under successive yield excursions due to seismic loading. The study of the first category of systems shows that code-designed buildings may exhibit only a moderate increase in displacement and ductility demand if the load-resisting elements have a purely elasto-plastic behaviour. On the contrary, the study of the second category of systems reveals that the shifting of resistance centres due to asymmetrically localized yielding of load-resisting element at one edge under coupled lateral-torsional motion, and the progressive deterioration of strength of this edge element, may cause a displacement and ductility demand several times those of the similar symmetric systems. Hence, the existing code provisions for asymmetric buildings can be considered adequate for the same constructed by RC, only if the strength deterioration in RC structural elements can be minimized through adequate reinforcement detailing.
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