预应力混凝土梁式桥安全运营监测系统研究

RESEARCH AND DEVELOPMENT OF HEALTH MONITORING SYSTEM FOR PRESTRESSED CONCRETE GIRDER BRIDGES

以一座三跨预应力混凝土连续箱梁桥作为监测研究对象,对预应力混凝土梁式桥结构安全运营监测系统进行设计,阐述监测系统的监测对象、监测内容及设计原则,并对传感器的布置进行优化设计。提出基于动态称重(WIM)技术对桥梁实施安全运营监测的方法,编制桥梁实时动力分析程序BDANS(Bridge Dynamic Analysis System)梁式桥动力分析功能模块,分析桥梁在随机车流作用下的结构动力特性,建立车辆超载超限分级预警管理系统与桥梁结构承载力安全状况分级预警管理系统。该监测系统可实时连续地监测桥梁,并对桥梁的安全运营状况进行评估。

Taking a three-span prestressed concrete continuous box girder bridge as a research object, a structural health monitoring system for prestressed concrete girder bridges was designed. The monitoring objects, content and design principles of monitoring system was expounded, and the placement of sensors was optimally designed. Based on weigh-in-motion technology,a new monitoring method for the safety of bridge operation were proposed. Using girder bridge dynamic analysis function module of self-developed bridge dynamic analysis software BDANS, the structural dynamic characteristics of girder bridge under random traffic flow was analyzed. The grading prewarning management system of overload vehicles and bridge bearing capacity conditions were respectively established. The real-time monitoring system can monitor bridge continuously, and evaluate bridge safety operation conditions.