建筑内部物品滑移破坏易脆性分析中的楼面运动强度指标

An intensity measure of floor motions for seismic fragility analysis of sliding contents in buildings

合理选择建筑楼面运动强度指标是对建筑内部物品进行易脆性分析的基础。以建筑内部物品的滑移破坏为研究对象,通过单自由度简化模型模拟内部物品在地震引起的楼面运动作用下的滑移反应,并根据刚体在矩形脉冲作用下最大滑移距离的解析解,修正了目前常用的楼面运动强度指标。分析结果表明,物品在地震引起的楼面运动作用下的最大滑移距离远小于矩形脉冲作用下的解析解,且表现出相当大的离散性。未修正的楼面运动强度指标和最大滑移量之间在对数空间上呈比较明显的双线性关系,修正后的强度指标则与最大滑移量在对数空间上具有更好的线性关系。

The basis of seismic fragility analysis of sliding contents in buildings is choosing reasonably an intensity measure of floor motions.Taking the hazard associated with free standing sliding contents in buildings as the research object,the response of the sliding contents under the floor motion caused by the earthquake is simulated by a single-degree-of-freedom simplified model.The commonly used intensity measure of floor motions is modified by an analytical solution of the maximum sliding distance of a rigid body under a rectangular pulse.The results show that the maximum sliding distance of contents under the floor motion caused by the earthquake is much smaller than the analytical solution under a rectangular pulse,and it shows considerable dispersion.The relationship between the uncorrected intensity measure and the maximum sliding distance is obviously bilinear in logarithmic regression.The result is changed from bilinear to linear when choosing the modified intensity measure,which leads to better results.