竖向地震力导致结构破坏位置的研究
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摘要
结构竖向地震力应力σV和重力荷载应力σG的比值λV是判断竖向地震作用大小的重要参数。λV大于1时,结构会产生拉应力,可能发生倾倒破坏。传统观念认为,λV沿建筑物高度向上逐渐增大,即结构顶部受到的地震竖向地震作用最大。但是有很多震害表明结构底部受到的竖向地震作用也很大。本文通过对工程实例计算分析和λV计算公式的推导得出,λV沿建筑物高度向上呈现先减小后增加的趋势。
The ratio of vertical seismic stress and gravity stress is an important parameter of measuring vertical seismic effects.If λV is more than 1,structures would produce tensile stress,and an overturn would happen.The traditional concept is that λV increases gradually as the building height goes upwards,that is to say,the top of structures produces the biggest vertical seismic effect.However,a lot of seismic damage shows that vertical seismic effect produced by the bottom of structure is also considerable.By calculating and analyzing a real project and the formula of λV,this paper educes that as the building height goes upward,λV shows a decrease at first,then an increase follows.
The ratio of vertical seismic stress and gravity stress is an important parameter of measuring vertical seismic effects.If λV is more than 1,structures would produce tensile stress,and an overturn would happen.The traditional concept is that λV increases gradually as the building height goes upwards,that is to say,the top of structures produces the biggest vertical seismic effect.However,a lot of seismic damage shows that vertical seismic effect produced by the bottom of structure is also considerable.By calculating and analyzing a real project and the formula of λV,this paper educes that as the building height goes upward,λV shows a decrease at first,then an increase follows.
引文
[1]尚守平.结构抗震设计[M].北京:高等教育出版社,2003.
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[4]陈健云.高耸烟囱结构竖向地震响应的模型试验研究及分析[J].建筑结构学报.2005,26(2):87-93.
[5]GB50011-2001,建筑抗震设计规范[S].
[6]徐忠根,周福霖.我国首栋橡胶垫隔震住宅楼动力分析[J].世界地震工程,1996(1):38-42.
[7]谷伟,刘斌.橡胶垫基础隔震结构考虑竖向地震作用高宽比限制研究[J].工业建筑,2004,37(10):17-20.
[8]叶正强.结构竖向地震作用的计算方法[J].江苏建筑.1999(1):13-15.
[2]钱培风.竖向地震力和抗震砌块建筑[M].北京:中国大地出版社,1997:2-62.
[3]程岩.竖向地震作用对高柔结构的影响[J].西北地震学报,1999,21(4):423-427.
[4]陈健云.高耸烟囱结构竖向地震响应的模型试验研究及分析[J].建筑结构学报.2005,26(2):87-93.
[5]GB50011-2001,建筑抗震设计规范[S].
[6]徐忠根,周福霖.我国首栋橡胶垫隔震住宅楼动力分析[J].世界地震工程,1996(1):38-42.
[7]谷伟,刘斌.橡胶垫基础隔震结构考虑竖向地震作用高宽比限制研究[J].工业建筑,2004,37(10):17-20.
[8]叶正强.结构竖向地震作用的计算方法[J].江苏建筑.1999(1):13-15.
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