几何参数对矩形薄壁蜂窝网格高桥墩稳定性的研究  

Study on the Stability of Rectangular Thin-walled Honeycomb Grid High Piers By Geometric Parameters

作　　者：许琼方 薛江 XU Qiongfang;XUE Jiang(School of Civil Engineering,TCU,Tianjin 300384,China)

机构地区：[1]天津城建大学土木工程学院,天津300384

出　　处：《天津城建大学学报》2022年第4期238-243,共6页Journal of Tianjin Chengjian University

基　　金：天津市教委科研计划项目(2017KJ047)。

摘　　要：利用有限元计算软件MidasFea建立了矩形薄壁蜂窝网格高桥墩三维模型,基于结构稳定原理研究网格排列形式、墩柱壁厚、网格壁厚和网格数量等主要几何参数对高桥墩稳定性的影响规律.结果表明:当桥墩截面形式对称布置,截面积和网格数量固定时,横向"一"字型排列为其网格最优排列形式;当桥墩截面形式固定时,网格数量越多,墩柱壁厚和网格数量对其稳定性的影响越大,但材料消耗和施工难度也越大,因此,在桥墩墩柱壁厚和网格厚度都小于墩宽的1/70时,优先考虑增加墩柱壁厚,增加到墩宽的1/70后,采用增加网格厚度的方式来提高桥墩稳定性;在两者都大于墩宽的1/70后,可通过增加网格数量来提高桥墩稳定性.A 3D model of the high pier with rectangular thin-walled honeycomb grid was established using finite element calculation software MidasFea,and the main geometric parameters such as grid arrangement,pier wall thickness,grid wall thickness,and grid number affecting its stability and its influence law were studied based on the principle of structural stability.The results show that when the cross-section of the pier is symmetrically arranged,the cross-section area and the number of grids are fixed,horizontal‘一'type arrangement is the best arrangement form of its grid,When the cross-section form of the pier is fixed,the more the number of grids,the greater the impact of pier wall thickness and grid number on its stability,but the greater the material consumption and construction difficulty.Therefore,when the wall thickness and grid thickness of the pier column are less than 1/70 of the pier width,the increase of the wall thickness of the pier column is preferred,and when the wall thickness increases to 1/70 of the pier width,the increase of the grid thickness is used to improve the stability of the pier.When both are greater than 1/70 of the pier width,the pier stability can be improved by increasing the number of grids.

关 键 词：蜂窝结构 高桥墩 稳定性 截面面积 屈曲系数 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]