Abstract:
Pakistan is a developing country with continuous advancements in the construction sector. In attempt to advance the construction practices in the country, the building code of Pakistan has been updated in 2021, to BCP-21 (Building Code of Pakistan 2021). Previously BCP-07 was being practiced, which was based on UBC-97 (Uniform Building Code 1997), which uses PGA as a seismic parameter. The new building code of Pakistan, BCP-21 is based on IBC-21 (International Building Code 2021), which uses spectral acceleration Ss and S1 as seismic parameters for estimating the seismic demands.
The change in the building code would lead to a change in construction practice and there arose a need to assess the seismic performance and cost difference of the buildings designed as per the new code. This thesis involves the study of 6-storey buildings, designed as MRF and Dual structural systems, using BCP-07 and BCP-21. The effect of change of code on MRF and Dual structure buildings was studied, using linear and non-linear approaches. The difference in the Concrete and steel quantities and the overall costs of buildings was also estimated.
A real 6-storey building was selected and modelled as MRF and Dual system. These models were analyzed and designed under the seismic hazard parameters of two locations, under BCP-07 and BCP-21. Due to different levels of seismicity, Islamabad and Abbottabad were selected as the locations for these models, in order to extract more precise and realistic conclusions. The seismic performance was assessed after the linear analysis and design, showing the difference in seismic demands and capacities of buildings under both codes. The quantities of concrete and steel were compared for all the models and the difference was estimated in the costs of buildings.
For more detailed analysis, the nonlinear seismic performance of the models was assessed using the non-linear static pushover analysis. A 6-storey building designed as per BCP-07 and BCP-21, was analyzed under the latest seismic requirements, using MRF and Dual structural systems. The pushover curves were analyzed, and useful conclusions were extracte
