【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。更多还原

【Abstract】 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.更多还原