Graduate Thesis Or Dissertation
 

Seismic performance and collapse assessments of reinforced concrete lateral- force resisting systems

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/sq87c164p

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  • Nonlinear response history analysis (NRHA) is increasingly becoming more accessible and prevalent in research and practice. As the accuracy of the NRHA results depends on the ground motion characteristics and the robustness of the numerical model, research has focused on the development of guidance for performance-based seismic design and assessment approaches employing nonlinear dynamic analysis. This thesis includes three parts related to the seismic performance and collapse assessment of reinforced concrete lateral force resisting systems through the implementation of the nonlinear dynamic analysis. In the first part, the seismic performance of the reinforced concrete special moment frame buildings is investigated. The special moment frame buildings are assessed using three Performance-Based Seismic Engineering (PBSE) standards and guidelines, including ASCE/SEI 41, the Tall Buildings Initiative (TBI) guidelines for performance-based design of tall buildings, and the Los Angeles Tall Buildings Structural Design Council (LATBSDC) procedures. The design of the buildings follows ASCE 7-16 and ACI 318-14. Assessments were performed for two performance and hazard levels, including Collapse Prevention (CP) at hazard level with 2 percent probability of exceedance in 50 years which is risk-targeted maximum considered earthquake (MCER) hazard level and Immediate Occupancy (IO) at a hazard level with 50 percent probability of exceedance in 30 years, i.e., serviceability performance level. The result indicates that the design of the special moment frame needs to be revised because it does not meet the global deformation limit of the TBI and LATBSDC guidelines. The second part explores the effects of the hazard consistent ground motion over a range of periods on the collapse capacity of the RC building. The Conditional Scenario Spectra (CSS) approach that selects ground motion records that account for spectral shape effects is used. These records were used in nonlinear dynamic analyses to determine the hazard-consistent collapse capacity of a 12-story concrete special shear wall and special moment frame structures. Collapse capacity was compared to estimates determined using FEMA P695 and Incremental Dynamic Analysis (IDA). The collapse capacity of the shear wall building more conservative when the spectral shape effects are considered in the ground motions. Finally, the third part, nonlinear dynamic responses of the reinforced concrete lateral-resisting systems using different damping models are investigated. Rayleigh damping model versus Modal damping model is compared for the RC special shear wall and special moment frame systems. The comparison included differences in peak story drift ratio, peak floor forces, damping energy, and strain distribution of the reinforcing steel along the building heights. In addition, collapse fragility functions were compared across damping models. The results show that the story forces are very sensitive to the changing of the damping model. However, the changing of the damping model has not significantly affected the story drift ratio. Also, the collapse fragility function does not show any sensitivity to the damping model changing.
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