成束钢框筒结构罕遇地震作用下的能量反应分析

发布时间：2018-03-15 07:15

本文选题：成束钢框筒结构　切入点：能量反应　出处：《建筑结构学报》2017年05期 　论文类型：期刊论文

【摘要】：基于对三种不同竖向收进方式的成束钢框筒结构进行的罕遇地震作用下的弹塑性时程分析,得到各种能量项数值,分析了采用不同峰值加速度输入下各能量项时程曲线的变化趋势。对输入能与地震加速度的关系、塑性耗能沿楼层的分布规律以及塑性耗能在构件中的分配进行了研究。探讨了组成束筒的各单个框筒的塑性耗能特点及其与竖向收进方式的关系。结果表明:采用不同的峰值加速度输入不影响弹性应变能、塑性耗能、阻尼耗能以及动能各项占总输入能比例的时程曲线变化趋势;当地震作用超过一定强度时,动能和弹性应变能在输入能中所占的比例变小,输入能主要依靠结构的塑性耗能来耗散;输入峰值加速度不同,塑性耗能沿楼层的分布规律也不同;窗裙梁是成束钢框筒结构最主要的耗能构件;组成束筒的各单个框筒耗能与输入的地震动峰值加速度有关;当输入的峰值加速度较大时,对于竖向未收进的模型,中间部位筒的耗能小于其周边筒的耗能,对于竖向收进的筒体,除收进变化较大的个别单筒外,单筒各层平均耗能较为均匀。
[Abstract]:Based on the elastic-plastic time-history analysis of three kinds of beam steel frame-tube structures with different vertical intake modes under rare earthquake, various energy terms are obtained. The variation trend of time history curve of each energy item under different peak acceleration input is analyzed, and the relation between input energy and seismic acceleration is discussed. The distribution of plastic energy dissipation along the floor and the distribution of plastic energy dissipation in members are studied. The characteristics of plastic energy dissipation of each single frame tube composed of bundles and the relationship between plastic energy dissipation and vertical intake mode are discussed. The results show that: 1. The input of different peak acceleration does not affect the elastic strain energy. Plastic energy dissipation, damping energy dissipation and kinetic energy consumption have a tendency to change in the time history curve of the proportion of total input energy, and when earthquake action exceeds a certain intensity, the proportion of kinetic energy and elastic strain energy in input energy becomes smaller, and when earthquake action exceeds a certain intensity, the proportion of kinetic energy and elastic strain energy in input energy becomes smaller. The input energy is mainly dissipated by the plastic energy dissipation of the structure, the distribution law of the plastic energy dissipation along the floor is different with the input peak acceleration, the window skirt beam is the most important energy dissipation member of the steel frame tube structure. The energy consumption of each single frame tube is related to the peak acceleration of the input ground motion. When the input peak acceleration is large, the energy consumption of the middle part of the tube is smaller than that of the peripheral cylinder for the model with vertical unreceived. For the vertical intake cylinder, the average energy consumption of each layer of the single cylinder is more uniform except for the individual cylinder with large variation.
【作者单位】：北京工业大学城市与工程安全减灾教育部重点实验室;河北建筑工程学院土木工程学院;中国电子工程设计院;
【基金】：北京市自然科学基金项目(8122040)
【分类号】：TU973.17

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