钢-混凝土混合变截面连续梁桥钢箱梁段合理长度研究  

Study on the reasonable length of steel box girder for steel-concrete hybrid continuous beam bridge

作　　者：陈康明[1,2] 杨洋 吴庆雄[1,3] 罗健平[1] CHEN Kangming;YANG Yang;WU Qingxiong;LUO Jianping(College of Civil Engineering,Fuzhou University,Fuzhou,Fujian 350108,China;Fujian Provincial University Key Laboratory of Civil Engineering,Fuzhou,Fujian 350108,China;Fujian Provincial Key Laboratory on Multi-Disasters Prevention and Mitigation in Civil Engineering,Fuzhou,Fujian 350108,China)

机构地区：[1]福州大学土木工程学院,福建福州350108 [2]工程结构福建省高校重点实验室,福建福州350108 [3]福建省土木工程多灾害防治重点实验室,福建福州350108

出　　处：《福州大学学报（自然科学版）》2022年第2期237-243,共7页Journal of Fuzhou University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(52078137);福建省自然科学基金杰青项目(2019J06009);福州市科技局产学研资助项目(2020-GX-27)。

摘　　要：为简便估算恒载作用下钢-混凝土混合变截面连续梁桥的合理钢箱梁段长度,基于现有三弯矩方程推导适用于变截面连续梁的改进三弯矩方程;建立基于改进三弯矩方程的变截面连续梁弯矩简化计算方法,构建不同跨径的变截面钢-混凝土混合标准连续梁桥,并给出其钢箱梁段合理长度的预估公式.研究结果表明:基于改进三弯矩方程的变截面连续梁弯矩计算结果与有限元计算结果的偏差小于10%,可以便捷且准确地计算恒载下变截面连续梁弯矩;预估公式计算得到的钢箱梁段合理长度与实桥使用的钢箱梁段长度之间的误差在12.5%以内,预估公式具有良好适用性.For easy to estimate the reasonable length of steel box girder for steel-concrete hybrid continuous beam bridge,based on the existing three-moment equation,this paper deduces the improved three-moment equation which is suitable for three-span variable cross-section continuous beam,the simplified calculation method of bending moment of variable cross-section continuous beam which based on the improved three moment equation is proposed.The standard steel-concrete hybrid continuous beam bridges with different spans are proposed,and the formula for estimating reasonable length of steel box girder in steel-concrete hybrid continuous beam bridges is proposed.The research results show that the simplified calculation method based on the improved three-moment equation which can be used to calculate the bending moment of concrete and steel-concrete hybrid continuous beam,and the calculation accuracy is within 10%;the lengths of steel box girder employed in existing bridges can be accurately estimated by proposed estimation formula with the errors within 12.5%,the proposed estimation formula has wide applicability.

关 键 词：变截面连续梁桥 钢-混凝土混合梁桥 改进三弯矩方程 钢箱梁段合理长度 

分 类 号：U448.21[建筑科学—桥梁与隧道工程]