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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。
Based on the elasto-plastic time-history analysis of the bundled steel framed tube structures under three different vertical loading methods, the numerical values of various energy items are obtained, and the energy items under different peak accelerations are analyzed Cheng curve of the trend. The relationship between input energy and earthquake acceleration, the distribution of plastic energy dissipation along the floor, and the distribution of plastic energy dissipation in components are studied. The characteristics of plastic energy dissipation and the relationship between the plastic energy dissipation and the vertical retraction mode of each single box tube which constitute the beam tube are discussed. The results show that the use of different peak accelerations does not affect the trend of the time-history curve of elastic energy, plastic energy consumption, damping energy consumption and kinetic energy in the total input energy proportion. When the earthquake action exceeds a certain intensity, the kinetic energy and elastic strain The proportion of input energy can be reduced, and the input can mainly depend on the plastic energy consumption of the structure to dissipate. The input peak acceleration is different and the distribution of plastic energy dissipation along the floor is also different. And the energy consumption of each single box tube which is composed of beam tubes is related to the peak acceleration of ground motions. When the input peak acceleration is large, the consumption of the middle part cylinder Can be less than the energy consumption of the surrounding cylinder, for the cylinder into the vertical, in addition to income into the larger individual single cylinder, single cylinder average energy consumption is more uniform.