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首先对构造不同的4个足尺比例冷弯薄壁型钢-混凝土组合楼盖模型进行了动载试验。在正常使用阶段,研究了压型钢板与冷弯薄壁型钢梁连接的螺钉间距、刚性支撑件、楼盖端部约束构造设置和楼面活荷载对组合楼盖基频的影响;其次采用ANSYS有限元程序对试验模型16种荷载工况的基频进行模拟,验证了有限元分析方法的可行性;接着利用有限元对组合楼盖基频影响因素进行了分析;最后提出了预测楼盖基频的理论公式。研究表明:组合楼盖的基频随楼面活荷载的增加而降低;压型钢板与楼盖梁连接的螺钉间距、楼盖梁间距、跨高比、腹板高厚比的减小和加强楼盖端部约束、增大楼盖梁及混凝土翼板厚度、相邻楼盖梁跨中设置刚性支撑件均能够提高组合楼盖的基频;而改变压型钢板板型和楼盖宽度对基频影响很小;提出的理论公式能够较好地预测组合楼盖基频。
First of all, four different-size full-scale cold-formed thin-walled steel-concrete composite floor models with four full-scale structures were tested. In the normal use phase, the influence of the screw pitch, the rigid support, the constraint structure of the floor and the live load on the base frequency of the composite floor were researched in the connection between the profiled steel plate and the cold-formed thin-walled steel beam. The ANSYS finite element program simulates the fundamental frequencies of the 16 loading conditions in the experimental model to verify the feasibility of the finite element analysis method. Then the finite element method is used to analyze the influence factors of the fundamental frequency of the composite floor. Finally, The fundamental frequency of the theoretical formula. The results show that the fundamental frequency of the composite floor decreases with the increase of live load of the composite floor. The reduction of the screw spacing, Constrained by the end of the floor, increasing the thickness of the floor beam and the concrete wing, setting the rigid support members in the adjacent floor beams can improve the fundamental frequency of the composite floor; while changing the plate type and floor width of the profiled plate The influence of frequency is very small; the theoretical formula proposed can better predict the fundamental frequency of the composite floor.