大跨度拱桥拱肋偏心距增大系数计算方法  

Calculation method of eccentricity increase coefficient of arch rib of long-span arch bridge

作　　者：郭峰 李鹏飞 毛佳艳 董延昭 GUO Feng;LI Peng-fei;MAO Jia-yan;DONG Yan-zhao(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Key Laboratory of Roads and Railway Engineering Safety Control,Ministry of Education,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Key Laboratory of Transportation Industry of Old Bridge Inspection and Reinforcement Technology(Beijing),Beijing 100085,China;Shijiazhuang Rail Transportation Group Co.,Ltd.,Shijiazhuang 050035,China)

机构地区：[1]石家庄铁道大学土木工程学院,石家庄050043 [2]石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室,石家庄050043 [3]旧桥检测与加固技术交通行业重点实验室(北京),北京100085 [4]石家庄市轨道交通集团有限责任公司,石家庄050035

出　　处：《吉林大学学报（工学版）》2022年第6期1404-1412,共9页Journal of Jilin University:Engineering and Technology Edition

基　　金：河北省科技厅项目(216Z6101G);河北省教育厅项目(QN2020207);旧桥检测与加固技术交通行业重点实验室项目(2020-8204)。

摘　　要：结合变分法基本原理和系杆拱结构变形后相互作用的特点,提出了实用的偏心距增大系数计算方法。通过工程案例分析,将本文计算方法与桥梁规范方法、有限元方法的计算结果进行对比,结果表明:规范方法的计算结果最大,本文方法的计算结果较大,有限元方法的计算结果偏小,本文方法的适用范围较广且具有安全性;悬链线、抛物线、圆弧线和两端带约束的直杆的偏心距增大系数计算有较大区别,与系杆拱的约束条件及荷载形式有关。Combined with the basic principle of variational method and the characteristics of interaction after deformation of tied arch structure,a practical calculation method of eccentric distance increase coefficient is proposed.Through engineering case analysis,the calculation result of this paper is compared with the normative method of bridge and the finite element method.The results show that the calculation formula specified in the code has the largest result,the calculation result of the formula is large,the finite element calculation result is small.This above means the proposed method is widely applicable and safe.The calculations of the eccentricity increase coefficient of are quite different in catenary,parabola,circular arc and straight rod with constraints at both ends,related to the constraint conditions of the tie-rod arch and the forms of load.

关 键 词：变分法 弯矩增大系数 应变势能 二阶弯矩效应 拱肋 

分 类 号：TU318[建筑科学—结构工程]