大跨预应力混凝土楼盖的双向加速度分布规律及舒适度分析研究

发布时间：2018-11-13 10:23

【摘要】：大跨预应力混凝土楼盖刚度低、阻尼小、最小频率接近人走动和跳跃的频率,在人行激励下,很容易不可避免地发生共振,使人产生不舒适感.本文在总结分析楼盖竖向峰值加速度、各控制点的加速度时程曲线在楼面内双向分布的基础上,建立了大跨预应力混凝土楼盖整体结构的有限元分析模型,对选定的楼盖方案在三种人行激励工况下的动力响应进行了分析.同时,通过楼盖内加速度分布曲线,对该方案楼盖的舒适度进行了评估.计算结果表明,加速度基本上是关于楼盖的形心轴对称变化,呈抛物线分布;楼盖的初始状态对楼盖振动的峰值加速度有很大影响,可能导致振动初始阶段楼盖峰值加速度加大,为大跨预应力混凝土楼盖结构舒适度的深入研究及减振隔振设计提供了参考.
[Abstract]:The long-span prestressed concrete floor has low stiffness, small damping, and the minimum frequency is close to the frequency of walking and jumping. Under pedestrian excitation, resonance is inevitable, which makes people feel uncomfortable. On the basis of summing up and analyzing the vertical peak acceleration of floor and the bidirectional distribution of acceleration curve of each control point in the floor, the finite element analysis model of large-span prestressed concrete floor structure is established in this paper. The dynamic response of the selected floor scheme under three pedestrian excitation conditions is analyzed. At the same time, through the acceleration distribution curve of floor, the comfort degree of floor is evaluated. The results show that the acceleration is basically a parabola distribution about the axial symmetry of the floor. The initial state of the floor has a great influence on the peak acceleration of the floor vibration, which may lead to the increase of the peak acceleration of the floor in the initial stage of vibration. It provides a reference for the deep study of the comfort degree of long span prestressed concrete floor structure and the design of vibration absorption and isolation.
【作者单位】：西安建筑科技大学土木工程学院;河北建筑设计研究院有限责任公司;
【基金】：国家自然科学基金面上项目(51278395) 陕西省教育厅专项基金(12JK0895)
【分类号】：TU378

【参考文献】