考虑玻璃刚度的高层幕墙地震响应数值分析
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摘要
玻璃幕墙设计一般认为幕墙结构的力学性能主要由支承结构决定,常常忽略玻璃刚度对于幕墙的影响,或者将玻璃等效为质量施加于幕墙支承结构。然而对于超高层悬挂式幕墙结构,当承受较大风载和地震作用时,幕墙支承结构将产生较大变形,此时玻璃刚度将一定程度影响幕墙整体刚度。针对这一问题,依托上海某在建超高层大厦幕墙,研究了考虑玻璃刚度的大厦幕墙地震响应。并将此与未考虑玻璃刚度的地震响应进行对比分析,结果表明玻璃刚度增大了幕墙整体刚度,从而一定程度上减少了幕墙变形以及幕墙杆件的应力,但对大厦主体结构影响较少。本文最终的计算结果可作为该工程幕墙抗震设计参考依据。
It is generally believed that the mechanical properties of a curtain wall structure are determined mainly with its curtain supporting structure in curtain wall design,and the effect of glass stiffness on the curtain wall is often ignored,or the glass panel is simplified in to an equiralent mass imposed on the curtain supporting structure.However,for a super-tall suspended curtain wall structure,the curtain supporting structure generates a large deformation when it withstands severe wind and earthquake,then the glass stiffness affects the overall stiffness of the curtain wall structure.For this problem,taking a super-tall curtain wall under construction in Shanghai as a studying object,the seismic response of the curtain wall structure considering glass stiffness was studied,and the results with glass stiffness were contrasted with those without glass panel.It was shown that the glass stiffness increases the overall stiffness of the curtain wall structure,so it decreases its deformation and the stress of its bars to some extent,but it has less effect on the main structure of the building;the final results can be used as a reference for aseisimc design of this super-tall curtain wall structure.
It is generally believed that the mechanical properties of a curtain wall structure are determined mainly with its curtain supporting structure in curtain wall design,and the effect of glass stiffness on the curtain wall is often ignored,or the glass panel is simplified in to an equiralent mass imposed on the curtain supporting structure.However,for a super-tall suspended curtain wall structure,the curtain supporting structure generates a large deformation when it withstands severe wind and earthquake,then the glass stiffness affects the overall stiffness of the curtain wall structure.For this problem,taking a super-tall curtain wall under construction in Shanghai as a studying object,the seismic response of the curtain wall structure considering glass stiffness was studied,and the results with glass stiffness were contrasted with those without glass panel.It was shown that the glass stiffness increases the overall stiffness of the curtain wall structure,so it decreases its deformation and the stress of its bars to some extent,but it has less effect on the main structure of the building;the final results can be used as a reference for aseisimc design of this super-tall curtain wall structure.
引文
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[2]石永久,李勇,王元清.点支式幕墙单层索网谐波地震响应的几何非线性研究[J].振动与冲击,2009,28(10):31-35.
[3]李勇,石永久,王元清.单层索网玻璃幕墙与主体结构地震响应的整体分析[J].建筑科学,2009,25(7):5-10.
[4]冯若强,武岳,沈世钊.单索幕墙体系中的玻璃与索协同工作机理研究[J].西安建筑科技大学学报,2006,38(5):619-623.
[5]冯若强,武岳,沈世钊.考虑玻璃参与工作的单层平面索网幕墙结构静力性能研究[J].建筑结构学报,2005,26(4):99-106.
[6]冯若强,花定兴,武岳.单层平面索网幕墙结构玻璃与索网协同工作的动力性能研究[J].土木工程学报,2007,40(10):27-33.
[7]金先龙,李渊印.结构动力学并行计算方法及应用[M].北京:国防工业出版社,2008.
[8]丁峻宏,金先龙,郭毅之.沉管隧道地震响应的三维非线性数值模拟方法及应[J].振动与冲击,2005,24(5):18-22.
[9]JGJ3—2003高层建筑钢筋混凝土结构技术规程[S].北京:中国建筑工业出版社,2002.
[10]JGJ102—2003玻璃幕墙工程技术规范[S].北京:中国建筑工业出版社,2003.
[11]黄宝锋,卢文胜,曹文清.建筑幕墙抗震性能指标探讨[J].土木工程学报,2009,42(9):8-12.
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