山区大跨T型刚构桥设计要点  

Design Points of Long-span T-shaped Rigid Frame in Mountain Area

作　　者：燕海蛟[1] 黄康[1] 孙军举[1] 王毅力[1] YAN Haijiao;HUANG Kang;SUN Junju;WANG Yili(China Merchants Chongqing Communications Technology Research&Design Institute Co.,Ltd.,Chongqing 400067)

机构地区：[1]招商局重庆交通科研设计院有限公司,重庆400067

出　　处：《公路交通技术》2024年第3期41-54,共14页Technology of Highway and Transport

摘　　要：以巫镇高速公路后溪河大跨T型刚构桥为研究对象,采用大型有限元程序Midas Civil建立主桥计算模型,对主桥承载力、受压区高度、主梁应力、主墩施工稳定、计算长度等方面进行分析探讨。结果表明:1)主梁结构尺寸及配束合理,承载力具有较高的冗余度;2)箱梁底板厚度可适当降低,无需强制满足x≤ξbh 0,进而达到减轻结构自重的目的;3)主墩刚度适宜,施工大悬臂阶段稳定性较好;4)主墩进行强度、裂缝验算时,计算长度宜通过有限元屈曲分析,由欧拉临界力反算。Taking Houxi river long-span T-shaped rigid frame bridge of Wuxi-Zhenping Expressway as the research object,the calculation model of the main bridge is established by finite element program midas Civil.The bearing capacity of the main bridge,the height of the compression zone,the stress of the main beam,the construction stability of the main pier and the calculated length are analyzed and discussed.The results showed that:1)The structure size and prestress configuration of the main beam are reasonable,and the bearing capacity has high redundancy;2)The thickness of the bottom plate of the box girder can be appropriately reduced,without forcing to meet x≤ξbh 0,so as to achieve the purpose of reducing the weight of the structure;3)The stiffness of the main pier is suitable and has good stability in the construction of large cantilever stage;4)When checking the strength and crack of the main pier,the calculation length should be calculated by the finite element buckling analysis and the Euler critical force.

关 键 词：大跨T型刚构 受压区高度 计算长度 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]