拱桥的理论极限跨径分析  

Analysis of Theoretical Ultimate Span for Arch Bridge

作　　者：张显雄 邓卓章 方根深[2,4] 葛耀君[2,4] ZHANG Xian-xiong;DENG Zhuo-zhang;FANG Gen-shen;GE Yao-jun(Poly Changda Engineering Co.,Ltd.,Guangzhou 510000,China;State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China;China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430000,China;Key Laboratory of Transport Industry of Bridge Wind Resistance Technologies,Tongji University,Shanghai 200092,China)

机构地区：[1]保利长大工程有限公司,广州510000 [2]同济大学土木工程防灾国家重点实验室,上海200092 [3]中铁第四勘察设计院集团有限公司,武汉430000 [4]同济大学桥梁结构抗风技术交通行业重点实验室,上海200092

出　　处：《科学技术与工程》2023年第4期1709-1718,共10页Science Technology and Engineering

基　　金：国家自然科学基金(51978527,51778495,52108469);上海市浦江人才计划(20PJ1413600);桥梁结构抗风技术交通行业重点实验室(上海)自主研究课题青年基金(KLWRTBMC-07)。

摘　　要：大跨径拱桥是跨越江河峡谷富有竞争力的桥型之一,近年来,随着施工技术的进步和高性能材料的应用,拱桥正在不断突破自身跨径纪录,研究其理论极限跨径具有重要意义。综合考虑强度、面内稳定和面外稳定条件,分别基于抛物线拱轴线和悬链线拱轴线,采用理论推导获得了拱桥的极限跨径的解析公式,并由此考虑高性能混凝土、活性粉末混凝土和高强度钢等新材料的应用,针对混凝土拱桥和钢拱桥,分析其理论极限跨径随矢跨比和材料强度的变化关系。结果表明:基于悬链线推导出来的理论极限跨径略小于基于抛物线推导的结果,但结果相差不大。在矢跨比1/5时,混凝土拱桥主拱采用R200活性粉末混凝土时的理论极限跨径可超过2000 m,钢拱桥主拱采用Q690高强钢材时的理论极限跨径可超过2500 m。Long-span arch bridge is one of competitive types of bridge to cross rives and canyons.Recent years,the record of span length for arch bridge has been continuously broken with the advancement of construction techniques and application of high-performance materials.It is of great importance to study the theoretical ultimate span length of arch bridge.Based on the parabolic and catenary arch axes,the analytical solutions of ultimate span length of arch bridge were solved using theoretical derivation accounting for the strength,in-plane stability and out-plane stability conditions,respectively.Then,using of high-performance concrete,reactive powder concrete and high-strength steel was considered to study the relationship between theoretical ultimate span length and rise-span ratio as well as material strength for concrete and steel arch bridges.The results show that the theoretical ultimate span length derived by catenary arch axis is slightly smaller than that obtained by parabolic arch axis,but the difference is insignificant.When the rise-span ratio is 1/5,the theoretical ultimate span length for concrete arch bridge using R200 reactive powder concrete can reach 2000 m while the main span of steel arch bridge using Q690 high-strength steel can be longer than 2500 m.

关 键 词：拱桥 极限跨径 理论分析 高强材料 

分 类 号：U448.22[建筑科学—桥梁与隧道工程]