工字梁组合刚构桥墩梁节点传力机理与设计方法  

Force Transmission Mechanism and Design Method on Pier-beam Connection of I-shaped Composite Rigid Frame Bridge

作　　者：黄育凡 陈凌杰 吴庆雄[1,3] 林飞鸿 HUANG Yufan;CHEN Lingjie;WU Qingxiong;LIN Feihong(College of Civil Engineering,Fuzhou University,Fuzhou 350116,China;Fujian Provincial Key Laboratory on Multi-Disasters Prevention and Mitigation in Civil Engineering,Fuzhou 350116,China;Key Laboratory of Civil Engineering,Fujian Province University,Fuzhou 350116,China)

机构地区：[1]福州大学土木工程学院,福建福州350116 [2]福建省土木工程多灾害防治重点实验室,福建福州350116 [3]工程结构福建省高校重点实验室,福建福州350116

出　　处：《湖南大学学报(自然科学版)》2025年第3期47-59,共13页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51608125);福建省自然科学基金项目(2022J01093)。

摘　　要：工字梁组合刚构桥墩梁节点受力复杂,墩梁节点传力机理与荷载分配规律尚不明确,且缺乏相应的墩梁节点计算方法.通过对比工字梁组合刚构桥墩梁节点试验结果,采用验证后的实体有限元计算模型,根据墩梁节点各部件在桥墩轴力、弯矩、剪力单独作用下的受力状态,分析墩梁节点的传力机理和荷载承担占比,建立各部件的设计计算方法,并开展工字梁组合刚构桥试设计.结果表明:墩梁节点的轴力和弯矩传递机理和路径接近,剪力传递机理有所区别;纵梁与横梁各承担45%~55%荷载传递,轴压力和轴拉力作用下纵梁传力路径及荷载承担占比有所变化,直接由纵梁传递的荷载主要通过纵梁下翼缘传递,传递至横梁的荷载主要由横梁腹板栓钉承担.纵梁设计应考虑桥墩截面附加应力,横梁按照简支梁均布荷载受力模式计算,横梁腹板连接件设计按承担所有传递至横梁的荷载计算,纵梁腹板栓钉及下翼缘栓钉按照构造要求配置.试设计桥梁墩梁节点验算满足要求,有限元分析与理论计算结果相符,建立的墩梁节点设计方法可适用于工字梁组合刚构桥设计.The stress of pier-beam connections ofⅠ-shaped steel-concrete composite rigid frame bridges is complex,the force transmission mechanism and load distribution of pier-beam joints are still unclear,and the calculation method of pier-beam joints is lacking.By comparing the test results of the pier-beam joints of theⅠ-shaped composite rigid frame bridges,the verified solid finite element calculation model is adopted.According to the stress state of each component of the pier-beam joint under the action of the axial force,bending moment and shearing force of the pier,the force transmission mechanism and load bearing ratio of the pier-beam joint are analyzed.The design calculation method of each component is established,and the trial design of theⅠ-shaped composite rigid frame bridge is carried out.The results show that the force transmission mechanism and path of axial force and bending moment are similar,and the shearing force transmission mechanism is different.The longitudinal beam and the transverse beam bear 45%~55%of the load transfer,respectively.Under the action of axial pressure and axial tension,the load transfer path and the load bearing proportion of the longitudinal beam change.The load directly transmitted by the longitudinal beam is mainly transmitted through the lower flange of the longitudinal beam,and the load transmitted to the transverse beam is mainly borne by the studs of the web.The design of the longitudinal beam should consider the additional stress of the pier load.The transverse beam is calculated according to the uniform load force mode of the simply supported beam.The design of the transverse beam web connector is calculated according to the load transferred to the transverse beam.The studs of the longitudinal beam web and lower flange are arranged by structural requirements.The pier-beam joint of trial design bridges meets the requirements.The finite element calculation results are consistent with the theoretical calculation results.The established pier-beam joint design method can

关 键 词：组合桥梁 节点 有限元分析 传力机理 计算方法 

分 类 号：U443.37[建筑科学—桥梁与隧道工程]