成束钢框筒结构罕遇地震作用下的能量反应分析
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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。
Elasto-plastic time-history analysis of structure under rare earthquake was used to analyze three steel bundled-tube structure models with different setbacks. Based on the energy items,distribution of energy curves under different peak acceleration waves,relation between input energy and wave acceleration,distribution of plastic energy dissipation along structural height and in structural members have been studied. The plastic energy dissipation of each single tube formed bundled-tube and the influences by vertical setback were also discussed. The results show that different peak acceleration inputs can not affect the change trend of elastic strain energy,plastic energy dissipation,damping energy consumption and proportion of kinetic energy in the input energy. When the earthquake exceeds a certain intensity,the proportion of kinetic energy and elastic strain energy in the input energy can be reduced,and the input energy can be dissipated mainly by the plastic energy dissipation of the structure. The peak acceleration of input ground motion is different,and the distribution of plastic energy dissipation along the floor is also different. The spandrel beams are the most important energy dissipation members. The energy dissipation of single tube is related to the input ground motion peak acceleration. When the input peak acceleration is large,as for models without vertical setback,energy dissipation in the middle part of the bundled-tube is less than the energy dissipation of the surrounding. Except for the single tube with large variation,the average plastic energy dissipation per floor of single tube is uniform for models with different setbacks.
Elasto-plastic time-history analysis of structure under rare earthquake was used to analyze three steel bundled-tube structure models with different setbacks. Based on the energy items,distribution of energy curves under different peak acceleration waves,relation between input energy and wave acceleration,distribution of plastic energy dissipation along structural height and in structural members have been studied. The plastic energy dissipation of each single tube formed bundled-tube and the influences by vertical setback were also discussed. The results show that different peak acceleration inputs can not affect the change trend of elastic strain energy,plastic energy dissipation,damping energy consumption and proportion of kinetic energy in the input energy. When the earthquake exceeds a certain intensity,the proportion of kinetic energy and elastic strain energy in the input energy can be reduced,and the input energy can be dissipated mainly by the plastic energy dissipation of the structure. The peak acceleration of input ground motion is different,and the distribution of plastic energy dissipation along the floor is also different. The spandrel beams are the most important energy dissipation members. The energy dissipation of single tube is related to the input ground motion peak acceleration. When the input peak acceleration is large,as for models without vertical setback,energy dissipation in the middle part of the bundled-tube is less than the energy dissipation of the surrounding. Except for the single tube with large variation,the average plastic energy dissipation per floor of single tube is uniform for models with different setbacks.
引文
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[2]肖明葵,刘波,白绍良.抗震结构总输入能量及其影响因素分析[J].重庆建筑大学学报,1996,18(2):20-33.(XIAO Mingkui,LIU Bo,BAI Shaoliang.Analysis of the total energy and its influencing factors for seismic structures[J].Journal of Chongqing Jianzhu University,1996,18(2):20-33.(in Chinese))
[3]程光煜,叶列平.弹塑性MDOF系统地震输入能量研究[J].工程抗震与加固改造,2007,29(6):29-35.(CHENG Guangyu,YE Lieping.Earthquake energy input of inelastic MDOF systems[J].Earthquake Resistant Engineering and Retrofitting,2007,29(6):29-35.(in Chinese))
[4]MANFREDI G.Evaluation of seismic energy demand[J].Earthquake Engineering&Structural Dynamics,2001,30(4):485-499.
[5]NAKASHIMA M,SABURI K,TSUJI B.Energy input and dissipation behaviour of structures with hysteretic dampers[J].Earthquake Engineering&Structural Dynamics,1996,25(5):483-496.
[6]瞿岳前,梁兴文,田野.基于能量分析的地震损伤性能评估[J].世界地震工程,2006,22(1):109-114.(QU Yueqian,LIANG Xingwen,TIAN Ye.Evaluation of seismic damage performance based on energy analysis[J].World Earthquake Engineering,2006,22(1):109-114.(in Chinese))
[7]缪志伟,叶列平.罕遇地震作用下钢筋混凝土框架-剪力墙结构的耗能机制分析[J].建筑结构学报,2013,34(2):45-52.(MIAO Zhiwei,YE Lieping.Study on the energy dissipation mechanism of reinforced concrete frame-shear wall structure under rare earthquakes[J].Journal of Building Structures,2013,34(2):45-52.(in Chinese))
[8]叶列平,程光煜,曲哲,等.基于能量抗震设计方法研究及其在钢支撑框架结构中的应用[J].建筑结构学报,2012,33(11):36-45.(YE Lieping,CHENG Guangyu,QU Zhe,et al.Study on the energy-based seismic design method and application on steel braced frame structures[J].Journal of Building Structures,2012,33(11):36-45.(in Chinese))
[9]LEELATAVIWAT S,GOEL S C,STOJADINOVIC B.Energy-based seismic design of structures using yield mechanism and target drift[J].Journal of Structural Engineering,ASCE,2002,128(8):1046-1054.
[10]龚耀清,李珂.考虑地基变形时超高层建筑束筒结构的半解析自由振动分析[J].工程力学,2008,25(8):97-103.(GONG Yaoqing,LI Ke.Semi-analytical analysis for free vibration of super tall bundled-tube structures with subgrade deformation[J].Engineering Mechanics,2008,25(8):97-103.(in Chinese))
[11]胡启平,冯博.基于哈密顿理论的束筒结构剪力滞后分析[J].建筑科学,2014,30(5):6-9.(HU Qiping,FENG Bo.Analysis for bundled tube structures shearlag effect on Hamlton theory[J].Building Science,2014,30(5):6-9.(in Chinese))
[12]张劲,王庆扬,胡守营,等.ABAQUS混凝土损伤塑性模型参数验证[J].建筑结构,2008,38(8):127-130.(ZHANG Jin,WANG Qingyang,HU Shouying,et al.Parameters verification of concrete damaged plastic model of ABAQUS[J].Building Structure,2008,38(8):127-130.(in Chinese))
[13]刘哲峰,沈蒲生,胡习兵.地震总输入能量与瞬时输入能量谱的研[J].地震工程与工程振动,2006,26(6):31-36.(LIU Zhefeng,SHEN Pusheng,HU Xibing.Study on input energy and momentary input energy spectra of earthquake strong motion[J].Earthquake Engineering and Engineering Vibration,2006,26(6):31-36.(in Chinese))