PhD Student (Research Scholar), Indian Institute of Technology Bombay
Smart materials are new way to improve the performance of civil structures under earthquake loading.
The increasing research and development of smart materials and controlling devices has explored new area in structural engineering, providing a basic platform for the design and high performance structural systems. From past two-three decade, smart materials and structures systems have got more importance due to their great scientific and technological significance. The smart materials and structures have made a tremendous growth in terms of research and development, because of its interdisciplinary nature. The smart materials in the civil engineering it refers to increase the structural performance, to increase the design life of a structure, and serviceability with respect to conventional materials. Our aim is to improve the structural performance of structure using smart materials. Shape memory alloys (SMAs) are one of the type of smart materials which has unique properties, such as shape memory effect, super elastic effect, excellent fatigue resistance, excellent corrosion resistance and damping characteristics, which make them use for applications in seismic resistant structure and retrofitting of a structures.
Abstract: The shape memory alloys have limited applications in structural engineering. The high expensive value of building construction with these alloys is the main obstacle in using this material for building. In this paper, the performance of bracing with the combined shape memory alloys and steel have been studied. The seismic response of the five braced frames with bracing containing 20, 40, 60, 80 and 100% of shape memory alloy are determined and compared to the braced frame with steel brace. Nonlinear dynamic analysis of the frames is made with help of ANSYS V11 software under Elcentro earthquake record with maximum scaled acceleration 0.6 g and 0.9 g. The optimum value of alloy for the seismic performance improvement of braced frames has been calculated. So, the improved seismic behavior of braced frame was obtained with low cost by using method.
Pub.: 19 Feb '15, Pinned: 27 Jul '17
Abstract: Beam-column joint is a key component of a Reinforced Concrete (RC) moment resisting frame and should be designed and detailed properly, particularly when the frame is subjected to earthquake seismic forces. Failure of beam-column joints is governed by bond and shear failure mechanism which are brittle in nature. Therefore, all international codes insist sufficient anchorage to longitudinal bars and confinement of core concrete in resisting shear. In this paper, the behavior of exterior RC beam-column joints with Slurry Infiltrated Fibrous Concrete (SIFCON) in the joint core under reversed cyclic loading is presented. Beam-column joints made entirely with RC, Fibre Reinforced Concrete (FRC) and SIFCON are also investigated for comparison. A total number of ten specimens corresponding to five test series are cast and tested under reversed cyclic loading to study the load deformation behavior, ductility associated parameters, ultimate load carrying capacity and failure characteristics. A nonlinear finite element model is also developed using FEA software ANSYS to validate the experimental results such as load-deflection response and the corresponding failure modes. From the test results, it is observed that the ultimate load carrying capacity, stiffness, ductility and energy dissipation capacity are improved to a greater extent for beam-column joints with SIFCON when compared with that of conventional RC beamcolumn joints.
Pub.: 15 Apr '16, Pinned: 27 Jul '17
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