公路混凝土T梁桥结构体系损伤评定  

Damage assessment of concrete T-beam bridge systems

作　　者：姚晓飞[1,2] 徐岳[1] 丁怡洁[3] 付迎春[1] 

机构地区：[1]长安大学旧桥检测与加固技术交通行业重点实验室,陕西西安710064 [2]福建省交通质监站,福建福州350001 [3]西安建筑科技大学土木学院,陕西西安710054

出　　处：《广西大学学报（自然科学版）》2010年第1期120-126,共7页Journal of Guangxi University（Natural Science Edition）

基　　金：国家西部交通建设科技项目(200531822316;200631822302-04)

摘　　要：针对目前典型的混凝土T梁桥横向连接方式,在前期试验的基础上,对20m标准跨径混凝土梁桥,采用和试验相同的建模方式,以数值模拟的方法研究了不同横隔梁损伤对混凝土梁式桥荷载横向分布及体系的影响。结果表明,在所有中横隔梁全部损伤以前,荷载横向分布影响线坐标变化率随着横隔梁损伤数量基本上按照线性规律变化;所有中横隔梁损伤以后,横向连接状态向翼缘连接状态急剧变化;只有当某片梁两侧的中横隔梁同时失效后,这片梁的荷载横向分布才退化到由翼缘连接决定的状态。在此基础上,提出了活载横向分布调整系数,并给出了确定原则和方法。在既有混凝土梁桥的检算评定中,可以适当的提高活载检算荷载效应,以反映桥梁实际承受荷载情况。The influence of damaged transverse connection on the prefabricated concrete T-beam bridges was studied by finite element analysis. One concrete model of 20 m T-beam bridge using welding steel plate was constructed. The impacts of different conditions to transverse load distribution were discussed. Before the failure of all middle diaphragms, change of influence line coordinates was linear. After that, transverse connection changed sharply. Only when the middle diaphragms at both sides all fail, was the transverse load distribution determined by the beam flange connection. On this basis, the live load adjustment coefficient and its determination principle were put forward, which could properly increase the influence of vehicle load during the assessment of bridges, and reflect the actual loads of the T-beam bridges.

关 键 词：横向损伤 混凝土T梁桥 荷载横向分布 活载横向分布调整系数 

分 类 号：U448[建筑科学—桥梁与隧道工程]