多层大跨度新型盒式结构动力特性分析

Dynamic Characteristics Analysis of the New Large Span Box Structure

为研究多层大跨度新型盒式结构的动力特性,采用SAP2000有限元软件建立结构模型,分析结构频率和振型;对影响结构频率的立柱尺寸、薄板厚度、剪力键高度等因素进行参数化分析。分析结果表明,新型盒式结构的低阶振型主要为结构的平动和扭转,高阶振型主要为楼板的竖向振动;立柱尺寸、薄板厚度和剪力键高度对结构频率都有一定的影响,对高阶频率影响相对显著;合理设置叠合层可增强结构的刚度、强度和整体性。

In order to study the dynamic characteristics of the new large span box structure,a structure model was built by using SAP2000 finite element software to analyze the frequencies and modes of the structure;parametric analysis of column size,thickness of sheet,height of shear connectors and other factors which affect the structure frequencies was performed.The analysis results show that,low order vibration modes of the new large span box structure are mainly structural translation and torsion,the higher order vibration for vertical vibration of floor slab;all of column size,thickness of sheet and height of shear connectors have some effects on the structure frequencies,especially on the higher order frequencies;reasonable setting can strengthen the structure stiffness,strength and integrity.