Making Evaluation System of Seismic Resistance for Concrete Structures

本研究的目的是利用三维非线性动力响应分析，以结构尺寸和结构位置地震波的地震动为输入数据，建立城市混凝土结构的抗震评价体系。本研究进行了以下研究。(1)利用EMPR模拟技术，建立了2003年兵古肯南部地震、东海地震、东海地震及其耦合地震、三里kuminami地震和东海地震的地震波，并对所谓工程基岩上表面的非平稳强运动时程进行了模拟。然后，利用地面响应分析（FDEL），将等效应变特性的建立与剪切刚度和阻尼相结合，得到了这些地震在结构位置的地震地面运动。(2)对三维非线性动力响应分析的计算机程序进行了改进和扩展，使其考虑了高强度配筋。对少量腹板配筋的钢筋混凝土梁进行了试验，将无腹板配筋混凝土梁的抗剪强度（Vc）和腹板配筋混凝土梁的抗剪强度（Vs）与试验抗剪强度（Vu）进行了比较。综上所述，Vc+Vs叠加法适用于估算腹板少量配筋梁的抗剪强度。(3)研究发现，结构所在位置的地面条件、地震动的主频率和地震动峰值后的波浪剖面是评价混凝土结构抗震性能的重要参数。

The purpose of this study is to make an evaluation system of seismic resistance for concrete structures in urban area using three dimensional nonlinear dynamic response analysis whose input data are structural dimensions and seismic ground motion obtained from the seismic wave at the structure location.The following studies were conducted in this research.(1) The seismic waves of Hyogo-ken nanbu Earthquake, the hypothetical earthquakes of Tokai, Tounankai and their coupled earthquake, Sanrikuminami Earthquake, and Tokachioki Earthquake in 2003 were developed using the simulation technique, EMPR, for non-stationary strong motion time histories on the upper surface of so-called engineering basemental rock. Then the seismic ground motions of these earthquakes at the structure location were obtained using the ground response analysis, so-called FDEL, which incorporates the erect of frequency dependent equivalent strain characteristics on the shear rigidity and damping.(2) The computer program of three dimensional nonlinear dynamic response analysis was improved and extended to consider the high strength reinforcement. The reinforced concrete beams with a small amount of web reinforcement were tested in order to compare the estimated shear strength calculated by summing up the shear strength of concrete beams without web reinforcement (Vc) and web reinforcement (Vs) to the tested shear strength (Vu). In conclusion, the superposition method (Vc+Vs) is applicable for estimating the shear strength of beams with a small amount of web reinforcement.(3) From this research it is found that the ground condition at the structure location, dominant frequency of ground motion, and wave profile after the peak of ground motion are important parameters to evaluate the seismic resistance for concrete structures.