PSI - Issue 70

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

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L2 arrangement with braces placed alternatively. Covering all corners and adjacent to it on both sides.

L2

L3 arrangement with braces placed alternatively. Covering all re entrant corners.

L3

3. Validation For the data validation a Model is taken from Bohara et al. (2022) which is modelled in ETABs. Results are compared and are within the acceptable limits.

Table 3: Validation of Model Parameters

Actual Value

Value from the model

Time Period of Model without bracing Time period of model with Inverted bracing Inter story Drift with Inverted bracing in x-axis on 2 nd story

1.457 sec 0.578 sec 0.000688

1.418 sec 0.588 sec 0.000644

4. Results and Discussions After the Model analysis is done some results are displayed and validated as mentioned above including Indian Standard Code and all the tables and graphs are plotted respectively to get the comparative analysis of all the models that have been modelled in this commercially available software. The result represented in terms of: Time Period, Base shear, Displacement, Storey shear. The model work is extended and further insight is present with RSM and THA respectively. 4.1 Time-Period The seismic evaluation of a structure is significantly affected by its time period. While empirical formulas provided in design codes are commonly used to estimate this time period, they are primarily intended for regular buildings and may not yield accurate results for irregular or braced structures. In the present study, the natural time period of the building is considered for analysis. It is evident that the inclusion of steel bracing systems, which are designed to resist lateral loads, leads to a reduction in the fundamental time period along the braced axis. Table 4 Time-period of different models Output Case Modes UNBRACED X-Braced V-Braced Eccentric Sec Sec Sec Sec MODAL M1 1.688 0.86 0.888 0.953 MODAL M2 1.687 0.848 0.874 0.941 MODAL M3 1.568 0.71 0.719 0.78 MODAL M4 0.531 0.26 0.274 0.309 MODAL M5 0.531 0.252 0.265 0.301 MODAL M6 0.493 0.167 0.18 0.228