基于等弯矩原理的梁拱组合桥吊杆力确定方法  

Method to Determine Hanger Force of Beam-arch Composite Bridge Based on the Principle of Equal Bending Moment

作　　者：鲁海笑 武时宇 刘钊[2] LU Hai-xiao;WU Shi-yu;LIU Zhao(College of Civil Engineering,Tongji University,Shanghai 200092 China;College of Civil Engineering,Southeast University,Nanjing Jiangsu 211189 China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]东南大学土木工程学院,江苏南京211189

出　　处：《江苏建筑》2022年第6期22-26,共5页Jiangsu Construction

摘　　要：通常用于确定吊杆内力的方法有恒载平衡法、柔度矩阵法和最小弯曲应变能法,但这三种方法常用于简支系杆拱桥。对于连续梁拱组合桥,吊杆力设置不合理会使结构产生较大弯矩,造成材料虚耗。文章提出了通过控制梁各跨最大弯矩绝对值相等的多跨梁等弯矩法,以此来确定梁拱组合桥的吊杆力。计算表明,多跨梁等弯矩法确定的吊杆内力使主梁弯矩更均衡,可实现结构内力的合理分配,具有很好的工程应用价值。There are three usual methods to determine the internal force of the hangers: "dead load balance method";"flexibility matrix method" and "minimum bending strain energy method", but these three methods are commonly used in simply supported tied-arch bridges. For continuous beam-arch composite bridges, the improper setting of hanger forces often causes large bending moments, resulting in material waste. In this paper, "multi-span beam moment equalization method" which controls the absolute value of the maximum bending moment of each span to be equal is proposed to determine the hanger forces for beam-arch composite bridges.The calculation results show that the internal force of the hangers determined by the multi-span beam moment equalization method makes the bending moment of the main beam more balanced, which achieves the rational distribution of structural force and has a good engineering application value.

关 键 词：梁拱组合桥 吊杆内力 多跨梁等弯矩法 弯矩均衡 

分 类 号：U441[建筑科学—桥梁与隧道工程] U448.22[交通运输工程—道路与铁道工程]