密肋复合墙结构体系抗震性能试验研究
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摘要
密肋复合墙结构独特的构造使结构在地震作用下表现出填块→框格→外框的破坏模式,实现对地震能量的分级释放,形成结构抗震的三道防线。为探讨密肋复合墙体中各道抗震防线对抗震性能的影响,进行2组复合墙体的试验研究。观察墙体主要破坏形态和破坏过程,分析墙体承载力、滞回特征、延性、刚度、耗能能力等抗震性能。研究表明:肋格约束下的填充砌块极限承载力明显提高,屈服位移减小,延性降低。加外框的墙体比不加外框的墙板承载力明显提高。屈服荷载之前主要为砌块开裂耗能,屈服荷载后主要为裂缝的开裂闭合及相互摩擦耗能,标准墙板中的砌块及墙板内裂缝分别受到肋格和外框的约束,摩擦耗能较为充分。在密肋结构中,可通过调整每道防线的设计参数改变三道抗震防线的发生顺序及耗能性能,实现三道抗震防线量化设计。
A unique multi-ribbed composite wall structure shows the failure mode of block-grid-outer frame under earthquake,it realizes the release of seismic energy with different levels,it forms triple seismic fortification lines.In order to explore its a seismic performance,two groups of the composite walls were studied.The main destruction mode and the main failure process of the wall were observed,the a seismic performances including bearing capacity,hysteresis characteristics,ductility,stiffness,and energy dissipation were analyzed Studies showed that under constraint of filled rib grid block,the bearing capacity of the well significantly improves,its yield displacement reduces,its ductility decreases; compared with non-framed wall panels,the framed wall capacity improves significantly;before yielding the main energy is dissipated for block cracking,after yielding,the main energy is dissipated for crack closure and friction between the crack;the blocks and cracks of the standard wall are constrained respectively by the rib grid,the energy consumption for friction can be more adequately;in a ribbed structure,by adjusting design parameters of each line of defense,the sequence of triple seismic fortification lines and seismic energy consumption performance can be changed,and the quantitative aseismic design of triple seismic fortification lines is achieved.
A unique multi-ribbed composite wall structure shows the failure mode of block-grid-outer frame under earthquake,it realizes the release of seismic energy with different levels,it forms triple seismic fortification lines.In order to explore its a seismic performance,two groups of the composite walls were studied.The main destruction mode and the main failure process of the wall were observed,the a seismic performances including bearing capacity,hysteresis characteristics,ductility,stiffness,and energy dissipation were analyzed Studies showed that under constraint of filled rib grid block,the bearing capacity of the well significantly improves,its yield displacement reduces,its ductility decreases; compared with non-framed wall panels,the framed wall capacity improves significantly;before yielding the main energy is dissipated for block cracking,after yielding,the main energy is dissipated for crack closure and friction between the crack;the blocks and cracks of the standard wall are constrained respectively by the rib grid,the energy consumption for friction can be more adequately;in a ribbed structure,by adjusting design parameters of each line of defense,the sequence of triple seismic fortification lines and seismic energy consumption performance can be changed,and the quantitative aseismic design of triple seismic fortification lines is achieved.
引文
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[4]李刚,程耿东.基于分灾模式的高层结构抗震优化设计[J].大谇理工大学学报.2000.40(4):483-488. LI Gang,CHENG Geng-dong.Damage reduction based structural optimization design for seismic high-rise structures [J].Journal of Dalian University of Technology,2000,40(4): 483 -488.
[5]张杰.改进型密肋结构三道防线抗震机理及其基于位移的分灾控制设计方法研究[D].北京:北京交通大学,2009.
[6]荆罡.密肋复合墙结构两阶段简化计算模型及结构随机地震响应分析[D].西安:西安建筑科技大学,2009.
[2]翁大根,吕西林.消能减震结构设计参数研究与试验验证[J].地震工程与工程振动,2004,24(2):150-157. WENG Da-gen,LU Xi-lin.Study on design parameters of energy dissipation structures with experiment verification[J]. Earthquake Engineering and Engineering Vibration,2004, 24(2);150-157.
[3]叶列平,欧阳彦峰.双重抗震结构及其设计参数的分析研究[J].工程力学,2000,17(2):24-29. YE Lie-ping;OUYANG Yan-feng.Dual seismic structure system and its parametric analysis[J].Engineering Mechanic8,2000,17(2):24-29.
[4]李刚,程耿东.基于分灾模式的高层结构抗震优化设计[J].大谇理工大学学报.2000.40(4):483-488. LI Gang,CHENG Geng-dong.Damage reduction based structural optimization design for seismic high-rise structures [J].Journal of Dalian University of Technology,2000,40(4): 483 -488.
[5]张杰.改进型密肋结构三道防线抗震机理及其基于位移的分灾控制设计方法研究[D].北京:北京交通大学,2009.
[6]荆罡.密肋复合墙结构两阶段简化计算模型及结构随机地震响应分析[D].西安:西安建筑科技大学,2009.
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