装配整体式正交正放H型钢空间钢网格楼盖在人致荷载下的振动研究与参数化分析

Vibration study and parametric analysis on assembled monolithic orthogonal H-shaped steel spatial grid floor under human-induced loads

介绍了一种新型空间楼盖结构,该楼盖的上、下层为H型钢肋,中间由方形钢管剪力键连接.以某实际工程为例,通过数值模拟方法,在行走、跳跃、起立3种具有代表性的人致荷载激励下,验算了楼盖的结构动力时程响应,计算每种工况的峰值加速度,并与舒适度评价标准限值进行对比.通过参数化分析方法,对楼盖进行了模态分析和动力时程分析,将各参数变化对自振频率和竖向振动的影响进行了分析.分析表明楼盖的自振特性类似于实心平板,低阶振型主要表现为竖向振动,结构具有良好的抗振性能,可以满足正常使用条件下的舒适度要求.

A new type of assembled floor structure is introduced.This steel spatial grid structure is made up of the top and bottom layer H-shaped steel ribs and square steel tube shear key.Taking aproject as an example,the numerical method is used to evaluate the vibration serviceability of the structure,which was imposed by 3 representative human-induced excitations including walking,jumping and standing up.The peak accelerations obtained from time-history dynamic analyses are compared with the limited values of the adopted standard.Through parametric analysis,the model analysis and dynamic time history analysis are carried out,and the influences on the natural frequency and the vertical vibration are analyzed.Analysis results show that the natural vibration of the floor is similar to a solid panel and low order modes are mainly vertical vibration.The structure has good anti-vibration performance and it can meet the comfort requirements under the normal conditions.