连续弯箱梁桥抗倾覆稳定性影响因素的有限元分析  

Finite Element Analysis on Influential Factors of Structural Stability of Continuous Curved Beam Box-Bridge

作　　者：张玥[1] 魏永杰[1] 杨庆嵘 许有俊[1] ZHANG Yue;WEI Yong-jie;YANG Qing-rong;XU You-jun(School of Civil Engineering/Inner Mongolia University of Science and Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学土木工程学院,内蒙古包头014010

出　　处：《山东农业大学学报（自然科学版）》2017年第4期540-544,共5页Journal of Shandong Agricultural University：Natural Science Edition

基　　金：基金项目:内蒙古自治区高等学校科学技术研究(NJZY14167)

摘　　要：针对平面线形为圆曲线的弯箱梁桥,以《公路桥涵通用图》中(20+32+20)m连续箱梁桥为例,通过引入倾覆临界曲率半径这一参数,运用Midas进行计算机仿真计算,模拟分析桥梁孔径、曲率半径、支座间距及预偏心等多个因素对临界半径和抗倾覆稳定性的影响。结果表明,桥梁孔径、曲率半径、支座间距及预偏心等多个因素的改变能够对临界曲率半径有明显的影响;当桥梁的实际曲率半径接近或等于临界曲率半时,其抗倾覆稳定性最小;对各因素合理的取值可以有效避开临界曲率半径,提高桥梁的抗倾覆稳定性。临界曲率半径可以作为设计阶段初步判断连续箱梁发生整体翻转可能性的一个简单实用的量化指标。On account of box girder bridge whose horizontal alignment is circular curve,this paper takes(20+32+20)mcontinuous box girder bridge in the general highway bridge graph as an example to calculate with Midas software by meansof introducing the parameter of capsized critical curvature radius to analyze the influences of bridge aperture,curvatureradius,distance between bearing,pre-eccentric and other factors on critical radius and stability against overturning.Theresults showed that the changes of the above factors had significant effects on the critical radius of curvature;when theactual radius of curvature of the bridge was equal or close to the critical radius of curvature,it had the minimum stabilityagainst overturning;the reasonable evaluation of various factors could effectively avoid the critical radius of curvature andimprove the stability against overturning.The critical radius of curvature could be used as a simple and practical quantitativeindicator to preliminarily estimate the possibility of overall overthrow of the continuous box girder.

关 键 词：连续弯箱梁桥 稳定性 影响因素 

分 类 号：TB24[一般工业技术—工程设计测绘]