A Study on the Seismic Response of a Non-earthquake Resistant RC Frame Using Inelastic Dynamic Analyses

1) Dept. of Architectural Engineering, Inha University, Incheon 402-751, Korea2) Dept. of Architecture, Dongyang Mirae University, Seoul 152-714, KoreaABSTRACT In this study, characteristics of the seismic response of the non-earthquake resistant reinforced concrete (RC) framewere identified. The test building is designed to withstand only gravity loads and not in compliance with modern seismic codes.Smooth bars were utilized for the reinforcement. Members are provided with minimal amount of stirrups to withstand low levelsof shear forces and the core concrete is virtually not confined. Columns are slender and more flexible than beams, and beam-col-umn connections were built without stirrups. Through the modeling of an example RC frame, the feasibility of the fiber element-based 3D nonlinear analysis method was investigated. Since the torsion is governed by the fundamental mode shape of the structu reunder dynamic loading, pushover analysis cannot predict torsional response accurately. Hence, dynamic response history analysisis a more appropriate analysis method to estimate the response of an asymmetric building. The latter method was shown to be accu-rate in representing global responses by the comparison of the analytical and experimental results. Analytical models without rigidlinks provided a good estimation of reduced stiffness and strength of the test structure due to bond-slip, by forming plastic hingescloser to the column ends. However, the absence of a proper model to represent the bond-slip poased the limitations on the currentinelastic analysis schemes for the seismic analysis of buildings especially for those with round steel reinforcements. Thus, devel-opment of the appropriate bond-slip model is in need to achieve more accurate analysis.Keywords : torsion, plan irregularity, reinforced concrete frame, bond-slip, non-earthquake resistant detail, inelastic dynamic analysis