三类箱梁横向内力计算及参数分析  

Calculation and Parameter Analysis on Transverse Internal Force of Three Types of Box Girder

作　　者：赵甜 ZHAO Tian(Henan Provincial Communications Planning,Survey and Design Institute Co.Ltd.,Zhengzhou 450018,China)

机构地区：[1]河南省交通规划设计研究院股份有限公司,郑州450018

出　　处：《河南科学》2021年第5期751-756,共6页Henan Science

基　　金：河南省交通运输厅科技计划项目(2019J-2-15)。

摘　　要：探讨了弹性支撑框架法、刚性支撑框架法和有限元法对包括混凝土箱梁和钢混组合箱梁在内的单箱单室、单箱双室和双箱单室三类箱梁横向内力计算的适用性,得到的主要结论有:(1)基于刚性支撑框架法和弹性支撑框架法得到的箱梁横向跨中最大弯矩与有限元结果误差按单箱单室、单箱双室和双箱单室依次增大;刚性支撑框架法和弹性支撑框架法对于桥面板计算精度较高,但对腹板和底板计算精度较差.(2)随着腹板线刚度的变化,箱梁横向最大弯矩随之变化,混凝土箱梁的桥面板横向受力接近弹性支撑连续梁,而钢混组合箱梁桥面板横向受力接近简支梁.(3)设置横隔板对减小双箱单室箱梁的横向内力效果显著.(4)箱梁横向内力对支撑刚度不敏感,可近似采用刚性支撑框架法代替弹性支撑框架法计算.In this paper,the applicability of elastic braced frame method,rigid braced frame method and finite element method to the calculation of transverse internal forces of single box single cell,single box double chamber and double box single cell including concrete box girder and steel-concrete composite box girder is discussed.Based on the rigid braced frame method and elastic braced frame method,the error between the maximum bending moment in the transverse span of box girder and the finite element results increases in the order of single box single cell,single box double chamber and double box single cell.The calculation accuracy of rigid braced frame method and elastic braced frame method for bridge deck is higher,but the calculation accuracy for web and bottom plate is poor.With the decrease of the web line stiffness,the maximum bending moment in the transverse span of the box girder increases and approaches to that of the simply supported beam.The transverse force of the deck of concrete box girder is close to that of elastic support continuous beam,while transverse force of the deck of steel-concrete composite box girder is close to that of simply supported beam.The transverse internal force of double box single cell box girder is significantly reduced by setting diaphragm.The lateral internal force of the box girder is not sensitive to the support stiffness,so the rigid braced frame method can be used instead of the elastic braced frame method for calculation.

关 键 词：桥梁工程 混凝土箱梁 钢混组合箱梁 横向内力 计算方法 参数分析 

分 类 号：U443.32[建筑科学—桥梁与隧道工程]