PSI - Issue 70

Maheshwar Bose et al. / Procedia Structural Integrity 70 (2025) 137–144

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4.2 Base shear It is the sum of the lateral force at a structure's base due to earthquake ground motions. It is a function of the structure's plan shape, time period, soil type, and seismic weight. In this study, four cases are analysed where in case I, Simple L-shape Building is analysed without bracings and rest other three cases are analysed by using steel braces of different types i.e. V-Braces, X-Braces, Eccentric braces. It is observed that adding steel bracing to the building increases the VB values of the model. Fig.1. shows the value of the base shear of each cases and the comparison of these base shear values among RSM, Linear static and three Ground motions is shown by using the graph.

Fig.1. Base shear values of the model building

4.3 Displacement Story displacement in irregular structures under lateral loads is an important parameter in structural design. The top story displacement response gives an indication of the possible damage levels of the structure. Fig 2(a) shows the maximum displacement in linear case whereas Fig 2(b) shows maximum and minimum displacement in x direction of three ground motions (GM’s) at the top story level in case of X -braced model (Non-Linear).

Fig.2 (a). Displacement values comparison of different level (Linear)

Fig.2 (b) Displacement values of 3GM’s (Non -linear)