摘要
针对预应力连续刚构桥的病害和传统加固方法存在的不足,提出一种在原结构上增设钢上弦杆和腹杆,并以原预应力混凝土结构作为下弦杆,形成桁式结构共同抵抗部分荷载的加固方法.通过增设钢结构,将部分原本由混凝土结构独自承担的荷载,转由桁式结构承担,从而达到以较少代价提高结构的抗弯能力、抗剪能力和承载力的目的.以香江圩郁江特大桥加固为例,详细阐述所提方法及其力学原理,并进行详细的加固设计.结果表明:所提方法在增加较少用钢量的前提下,能有效提高结构的刚度、强度和动力特性等,且施工方便,因此,适用于既有连续刚构桥的提载和加固改造.
Due to the shortcomings of traditional reinforcement methods and the damages of prestressed continuous rigid frame bridge,a new reinforcement method is proposed that steel upper chord and web are added to the original structure,and the original prestressed concrete structure is used as the lower chord to form a squat structure to resist partial load.The method is to add a steel structure,and part of the load originally undertaken by the concrete structure is transferred to the concrete structure,so as to achieve the purpose of improving the structural bending and shearing capacity and structural stiffness with less cost.This paper takes the reinforcement of Xiangjiangyu Yujiang Bridge as an example,elaborates the method and its mechanics,and carries out detailed reinforcement design.In addition,it can be seen from the comparative analysis of the finite element method that the method can effectively improve the mechanical properties such as rigidity,strength and dynamic characteristics of the structure under the premise of increasing the amount of steel used,and the construction is convenient,so it is suitable for both the loading and reinforcement of continuous rigid frame bridges.
作者
谢肖礼
杨创捷
周远航
XIE Xiaoli;YANG Chuangjie;ZHOU Yuanhang(College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China)
出处
《湖南科技大学学报（自然科学版）》
CAS
北大核心
2024年第2期44-51,共8页
Journal of Hunan University of Science And Technology：Natural Science Edition
基金
国家自然科学基金资助项目(51809046)
广西重点研发计划资助项目(桂科AB18126047)
广西防灾减灾与工程安全重点实验室系统性研究项目资助(2016ZDX0001)。
关键词
连续刚构
组合结构
桥梁加固
桁架结构
continuous rigid frame
combined structure
bridge reinforcement
truss structure
