【摘要】 针对脉冲型近场地震动的高能量输入,有必要发展以能量为指标的结构抗震性能分析方法.基于能量平衡原理,在给出多自由度体系的地震输入总能量和滞回耗能需求、结构耗能能力以及总能量沿各节点分布等计算方法的基础上,建立了一种基于能量概念的桥梁结构抗震性能评估方法.以3座加拿大的实际桥墩为算例,以近震记录和模拟脉冲为输入,验证了所建议方法的有效性和必要性.最后,以MDOF实体桥墩的时程分析结果为基础,对采用Akbas模型近似确定能量在以弯剪变形为主的中、低高度RC桥墩各截面分布的适用性进行了检验.更多还原

【Abstract】 Since great energy input demand exists for structures close to active fault regions,it is necessary to develop energy-based seismic analysis method.By considering the total energy input and hysteretic energy consumption demand of earthquake,as well as energy dissipation ability and energy distribution among each node of MDOF bridge pier,and based on energy-balance principle,an energy-based performance assessment method was introduced for bridge structure.A validation computation was conducted on 3 actual Canadian piers,which was excited by near-fault records and analog impulse.Finally,by inelastic time history analysis,the applicability of Akbas Rule to determine approximately energy distribution in medium-low height RC pier is discussed.更多还原