基于刚度退化对桁式组合拱桥拱顶加固的研究  

Research on Vault Strengthening of Composite Trussed Arch Bridge Based on Stiffness Degradation

作　　者：唐纪祥 姜迎秋[1] Tang Jixiang;Jiang Yingqiu(Central Research Institute of Building and Construction of MCC Group,Beijing 100088,China)

机构地区：[1]中冶建筑研究总院有限公司,北京100088

出　　处：《特种结构》2021年第5期94-97,102,共5页Special Structures

摘　　要：桁式组合拱桥因长期使用实腹段梁底普遍出现开裂现象,需进行加固处理。桁式组合拱桥主跨靠近跨中区域梁底开裂后,基于刚度退化理论,主跨局部因截面开裂导致刚度减小,主跨内力重新分布,开裂区域内力减小。经验算,主跨加固区段及加固量明显减少,避免了主跨加固自重加大,损伤加剧,有效解决了主跨承载力不足的问题。The bottom of the solid web section of the composite trussed arch bridge generally cracks due to longterm use,and it needs to be reinforced.According to the stiffness degradation theory,after the main span of the composite trussed arch bridge cracks at the bottom of the beam near the mid-span area,the stiffness of the cracked area is reduced due to the weakened section,the stresses of the main span are redistributed,and the stress of the cracked area is reduced.Calculations show that the strengthening area and strengthening amount of the main span are significantly reduced.In this way,the increase in damage caused by increase of the main span self-weight during the strengthening process is avoided,and the problem of insufficient bearing capacity is effectively solved.

关 键 词：刚度退化 桁式组合拱桥 加固 

分 类 号：U445.72[建筑科学—桥梁与隧道工程]