基于分布参数模型的多高层建筑楼面加速度研究

Floor acceleration analysis of multi-story and high-rise buildings based on a distributed parameter model

建筑非结构构件的抗震分析方法及其性能评估愈发受到关注和研究。其中,对楼面加速度需求进行研究可合理确定加速度敏感型非结构构件的地震作用。该研究通过分布参数模型对多高层建筑结构进行简化,建立楼面加速度与地震输入和结构特征的联系,研究了弯剪刚度比对结构动力特性、模态振型的影响;基于模型各阶频率比与弯剪刚度比的关系,提出识别结构弯剪刚度比的方法;选用ATC-63的远近场强震动记录数据集,预测了楼面加速度放大(floor acceleration amplification, FAA)系数,回归拟合了楼面加速度与结构阻尼比、周期、刚度比之间的关系,可用于对楼面加速度的预测。

More attention has been paid to the seismic performance and design of non-structural components of buildings. Among them, the analysis of floor acceleration demand can help to reasonably determine the seismic inputs of acceleration sensitive non-structural components. The main structure was simplified as a distributed parameter model, and the relationships between the floor acceleration and the seismic input and structural characteristics were established. The influence of the flexural to shear stiffness ratio on structural dynamic characteristics and modal shapes was studied. Based on the relationship between each order modal frequency ratio and the stiffness ratio, a method for identifying the stiffness ratio of the structure was proposed. The far-field and near-field strong motion record data sets from ATC-63 report were selected to predict the floor acceleration amplification(FAA) factor. The relationships between the FAA factor and the structural damping ratio, period, stiffness ratio were regressed and fitted, and these relationships can be used to predict the floor acceleration.