梁板式结构折面梁格分析方法若干问题研究

Study on Spatial-grillage Analysis Method for Beam-slab Structure

首先,就如何将折面梁格法合理应用于梁板式结构进行讨论,提出了hambly梁格的不足,并就折面梁格模型中的一些影响参数,包括结构划分后构件的空间排列与连接、截面刚度的修正、划分规则等进行分析;其次,指出合理的折面梁格模型应包括增加虚节点与腹板竖杆单元、杆件的空间正交排列、按弹性力学原理进行截面抗扭惯性矩修正以及尽量确保纵、横向杆件长度一致等;最后,以T梁和双主梁结构为实例进行试验及实体分析验证。对比结果显示,依此建立的折面梁格模型分析结果与试验、实体分析数据吻合良好,分析精度满足工程需求。

How to apply the spatial-grillage method reasonably to the beam-slab structure is discussed.Some deficiencies of the hambly-grillage method are put forward.Some influence factors of spatial-grillage method including the spatial arrangement and connection of the components after the structure is divided,the correction of section stiffness,diving rules and so on are analyzed.It is pointed out that the reasonable spatial-grillage model should include the increase of virtual nodes spatially and orthogonally arranged with web montant elements and member bars,and connect the torsional moment of inertia of the section based on the elastic mechanics principle,and try to ensure the same length of longitudinal and transverse bars.Finally,T-shaped beam and double girder structure are taken as the examples to carry out the test and solid analysis validation.The comparison results show that the result analyzed by the established spatial-grillage model is identical with the test and solid analysis data.And the analytical precision meets the engineering demands.