Abstract
A comparative study is carried out to estimate the seismic energy losses between the semi-rigid steel frames, modeled in two different approaches and rigid frames. For this purpose, three variant of earthquakes is considered, namely, far-field and near-field with forward directivity and fling step effect. These earthquakes are scaled to a peak ground acceleration (PGA) level of 0.4 and 0.6 g. The seismic energy loss is evaluated along with other seismic response parameters. The responses parameters of interest are maximum roof displacement, base shear, the total number of formation of plastic hinges with their square root of the sum of square (SRSS) values of maximum hinge rotations, and the energy dissipation in the form of modal damping and link hysteretic energy. For this numerical simulation study, a five-story rigid frame is designed as per Indian standard provisions as an illustrative problem. A nonlinear response history analysis is performed using the SAP2000 platform to evaluate the desired responses. The results of present work reveal that (i) the seismic energy dissipation significantly more in semi-rigid connected frame with plastic link as compared to elastic link; (ii) the energy dissipation in the form of plastic hinges are substantial in rigid frames as compared to semi-rigid frames with plastic and elastic link, plastic link model provides comparable loss in seismic energy with rigid frames; and (iii) the significance of seismic energy loss depends on earthquakes type, PGA level, degree of semi-rigidity and connection type.
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Sharma, V., Shrimali, M.K., Bharti, S.D., Datta, T.K. (2021). Seismic Energy Loss in Semi-rigid Steel Frames Under Near-Field Earthquakes. In: Saha, S.K., Mukherjee, M. (eds) Recent Advances in Computational Mechanics and Simulations. Lecture Notes in Civil Engineering, vol 103. Springer, Singapore. https://doi.org/10.1007/978-981-15-8138-0_33
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DOI: https://doi.org/10.1007/978-981-15-8138-0_33
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