株洲市妇女儿童活动中心楼板舒适度分析

SERVICEABILITY ANALYSIS ON FLOOR OF ZHUZHOU WOMEN AND CHILDREN ACTIVITY CENTER

现代建筑对空间和视觉效果要求越来越高,楼板体系往往采用大跨度或大悬挑的钢结构组合楼板。这种楼板的刚度与阻尼较普通现浇混凝土楼板小,竖向自振频率低,容易引起振动舒适度问题。对株洲市妇女儿童活动中心中部大跨度钢结构组合楼板舒适度进行了分析。通过模态分析可知:楼板的中部大跨度部位和悬挑部位易为振动不利位置;通过不利振动点的稳态分析和人行荷载激励的时程分析可知:楼板各不利振动点竖向自振频率均大于3 Hz,峰值加速度均小于50 mm/s^2,频率和加速度双重指标均满足我国现行相关规范对舒适度的评价要求。

Modern buildings are increasingly demanding space and visual effects,and its floor slab system often adopts long span or large suspended steel structure composite floor. The stiffness and damping of such floor slabs are smaller than those of cast-in-place concrete slabs,and its vertical netural frequency is lower than cast-in-place concrete slabs,those can cause the problems of vibration comfort. Based on the analysis of the comfort of long-span steel structures in Zhuzhou Women and Children Activity Center,the following conclusions were drawn: through the modal analysis,it could be seen that the long-span and overhanging parts of the floor were vulnerable to vibration. According to the steady-state analysis of the adverse vibration point and the time-history analysis of the pedestrian load,the vertical netural frequency of each adverse vibration point was greater than 3 Hz,and the peak acceleration was less than 50 mm/s2,and the frequency and acceleration double-index could meet the evaluation requirements of the Chinese current specification system.