基于滞回耗能的抗震结构最大位移反应

Maximum Displacement Estimation of Seismic Structures Based on Hysteresis Energy

以简化为单自由度体系的结构在地震作用下的滞回耗能特性为基础 ,讨论单自由度体系在短持时脉冲型、中等持时多频谱型以及长持时型等 3种不同类型地震波作用下的一周加载循环中的最大滞回耗能增量与体系非弹性最大位移反应的关系 ,提出基于结构滞回耗能特性的结构非弹性最大位移反应的简化计算公式 ,并指出简化公式的适用范围。由分析可知 ,当一周最大滞回耗能增量在总滞回耗能量中所占比例在 5 0 %～ 80 %之间时 ,结构可能产生冲击型破坏 ,可仅由最大位移反应和一次循环最大滞回耗能增量作为评估结构的抗震性能的指标。若最大一周滞回耗能增量在整个地震地面运动作用时程的总滞回耗能中所占百分比太小 ,体系可能产生累积损伤破坏 ,应考虑结构滞回耗能总量 。

Based on characteristics of hysteretic energy of structures which are simplified single freedom degree systems and under the short duration impulse modle mid duration and long duration modle earthquakes, correlation between the maximum hysteretic energy increment per cycle and the maximum inelastic displacement of different structures is investigated. Simplified equations to estimate the maximum inelastic displacement are obtained. The validity of the equation is recognized. It is pointed out that the impact destroy of the structures may occur when energy increment per cycleis 50 80 percent of total hysteretic energy, and the maximum hysteretic energy increment per cycle, and that the maximum inelastic displacement can be used to evaluate aseismic capacity.If energy increment per cycleis small relative to total hysteretic energy, the destroy of the structures by cumulate dissipation energy may occur, and the total hysteretic energy can be used to evaluate aseismic capacity.