人行荷载作用下大跨度梁加速度反应谱研究

加速度响应是舒适度评价体系的重要指标,同时由于结构设计阶段方案的频繁变更,如何快速有效地计算结构的加速度响应尤为重要。首先基于标准行人激励荷载模型,采用APDL建立大跨度简支梁在标准行人激励下的有限元的计算模型;然后对不同步频、阻尼、跨度及边界条件下的动力反应进行时程分析,得到最大加速度反应谱曲线;最后与部分学者推荐的结果进行比较分析。总体而言,标准行人激励荷载模型较为准确;且通过有限元分析消除了数值分析时用梁的挠曲函数代替梁横向位移反应产生的误差;并且解决了用第1振型加速度响应代替结构的加速度响应结果偏小的问题。

Acceleration Response Spectrum Research of Large Span Beam under Pedestrian Loads

Acceleration response is an important index of evaluating system, at the same time due to the frequent scheme changes in the structure design stage, how to quickly and efficiently calculate the acceleration response of the structure is especially important. First this article adopts APDL to establish the long-span beam finite element calculation model based on standard pedestrian excitation load model and analyses the dynamic response of the beam in different frequency, damping, span, boundary condition by a large number of time history analysis calculation,then get the maximum acceleration response spectrum envelope and gets the maximum acceleration response spectrum curve,finally comparing with some scholars recommend results. Overall the load model is more accurate;and adopts the finite element analysis to eliminates the error of using flexural function instead of horizontal displacement response during the numerical analysis;also solves the lesser result problem by using the first type vibration acceleration response instead of the acceleration response of the structure .