体外预应力加固曲线PC连续刚构桥受力性能分析  

Analysis of Force Performance of PC Continuous Rigid Bridge with Curved in Vitro Prestressing Reinforcement

作　　者：毛永康 宁晓骏[1] 毛德均 Mao Yongkang;Ning Xiaojun;Mao Dejun(Faculty of Civil Engineering and Architecture,Kunming University of Science and Technology,Kunming 650500,China;School of Architecture and Civil Engineering,Kunming University,Kunming 650214,China)

机构地区：[1]昆明理工大学建筑工程学院,昆明650500 [2]昆明学院建筑工程学院,昆明650214

出　　处：《科技通报》2024年第5期85-89,119,共6页Bulletin of Science and Technology

基　　金：昆明学院引进人才科研项目(XJ20220031)。

摘　　要：越来越多的桥梁随着使用年限的增长出现跨中下挠和裂缝等病害,其中,曲线PC连续刚构桥较为严重,需对其进行加固设计。为了准确反映病害桥梁的现状,本文提出基于Midas/Civil的4种损伤工况模型,根据挠度确定损伤工况并以此作为计算模型分析病害产生的原因。根据体外索下弯的次数提出3种加固方案并建立模型,依据加固思路对加固前后的抗弯承载力、截面上下缘应力以及挠度进行对比分析。结果表明:体外预应力张拉后,桥梁极限承载力、结构刚度以及压应力储备都得到提升,且抑制了主梁下挠,改善结构线形。More and more bridges with the increase of the service life of the span deflection and cracks and other diseases,of which,the curve PC continuous rigid bridge is more serious,need to be strengthened design.In order to accurately reflect the current situation of the diseased bridges,a four damage condition model based on Midas/Civil is proposed,which determines the damage condition according to the deflection and is used as a computational model to analyse the causes of the disease.Three reinforcement schemes are proposed and modelled according to the number of extracorporeal cables bending down,and comparative analyses of flexural capacity,stresses at the top and bottom edges of the section and deflection before and after reinforcement are carried out according to the reinforcement ideas.The results show that the ultimate bearing capacity,structural stiffness and compressive stress reserve of the bridge are improved after the extracorporeal prestressing tensioning,and the deflection of the main girder is suppressed,which improves the structural linearity.

关 键 词：曲线PC连续刚构桥 体外预应力加固 桥梁病害 数值模拟 损伤模型 

分 类 号：U445.72[建筑科学—桥梁与隧道工程]