钢箱梁横隔板优化布置对顶推施工力学性能的影响分析  

Influence of Optimal Arrangement of Diaphragm Plates of Steel Box Girder on the Stress of Incremental Launching Construction

作　　者：范红波 傅中秋[2] 刘锦军 刘光辉 巫勇 周轶峰 FAN Hongbo;FU Zhongqiu;LIU Jinjun;LIU Guanghui;WU Yong;ZHOU Yifeng(Nanjing Shangtie Local Railway Development Co.,Ltd.,Nanjing,Jiangsu210003,China;College of Civil Engineering and Transportation,Hohai University,Nanjing,Jiangsu210098,China;China Railway 24th Bureau Group Co.,Ltd.,Shanghai200433,China)

机构地区：[1]南京上铁地方铁路开发有限公司,江苏南京210003 [2]河海大学土木与交通学院,江苏南京210098 [3]中铁二十四局集团有限公司,上海200433

出　　处：《施工技术（中英文）》2024年第12期64-70,106,共8页Construction Technology

摘　　要：针对斜交连续钢箱梁的横隔板布置方式,提出在钢箱梁斜交支撑位置处加密设置正交横隔板,通过建立钢箱梁的有限元全桥模型,对不同横隔板布置方案进行了对比分析。在顶推最不利工况下,分析了不同横隔板布置方案下的结构内力、挠度、支座反力、局部应力及扭转变形,验证了新型横隔板布置方案的可行性。结果表明,新型横隔板布置方案与常规布置方案在支座反力及弯矩分布上基本一致,优势主要体现在易于加工制造、整体自重较小且能显著减小支撑区域应力水平。新型斜交连续钢箱梁横隔板优化布置方式在顶推施工中满足强度设计要求。Aiming at the arrangement of diaphragm plates in the skew continuous steel box girder,a new arrangement scheme is proposed by adding orthogonal transverse diaphragm plates at the oblique support positions of the steel box girder.By establishing the finite element full⁃bridge model of steel box girder,different arrangement schemes of diaphragm plates are compared and analyzed.Under the most unfavorable conditions of incremental launching,the structural internal force,deflection,bearing reaction force,local stress and torsional deformation of the structure under different layout schemes of diaphragm plates are analyzed,and the feasibility of the new layout scheme proposed in this paper is verified.The results show that the new layout scheme is basically consistent with the conventional layout scheme in the distribution of bearing reaction force and bending moment.The advantages mainly lie in easy processing and manufacturing,small overall weight,and significant reduction of stress level in the support area.The optimal layout of transverse diaphragm plates in the skew continuous steel box girder meets the strength design requirements during incremental launching construction.

关 键 词：桥梁工程 连续梁桥 钢箱梁 顶推 横隔板 优化布置 有限元分析 

分 类 号：U445.4[建筑科学—桥梁与隧道工程]