科研之友
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摘要
Based on the Monte Carlo simulation method, seismic control effect of vertical irregularity parameters for reinforced concrete (RC) frame structures were studied.Employing a 5-story and a 10-story frame structures with vertical irregularities of strength or stiffness on the first story and on the median story, and considering earthquake action as the random variable, nonlinear dynamic time history analysis was conducted to investigate the maximum interstory drift angle.The variation rule of the maximum inter-story drift angle with different vertical irregularities was explored, and the probability of failure exceeding the limit state was evaluated.The results show that the vertical strength irregularity and stiffness irregularity have significant effects on the response of the maximum inter-story drift angle.With the decreases of strength irregularity and stiffness irregularity factors, the maximum inter-story drifts increase.The vertical irregularities on the first story have a larger effect upon the structure' s inter-story drift than the vertical irregularities have on the median story, and strength irregularities have relatively greater effect upon the structure' s inter-story drift than the stiffness irregularities have.The vertical irregularities also have significant effect on the probability of failure for structures exceeding the limit state criteria.The exceeding probability increases as the vertical irregularity factor decreases.The smaller the irregular factor and the lower the limit state criteria are, the more significant this phenomenon becomes.The strength irregularity factor of 0.7 and the stiffness irregularity factor of 0.8 can be set as the seismic control limit.
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