铰接预应力混凝土空心板梁桥的空间受力行为及加固分析  

Spatial behavior and strengthening analysis of fabricated PC hollow slab beam bridge with hinge joints

作　　者：项贻强 邢骋[1] 邵林海 邢渊 晁春峰[1] 

机构地区：[1]浙江大学建筑工程学院,杭州310058 [2]华汇工程设计集团,绍兴312000

出　　处：《东南大学学报（自然科学版）》2012年第4期734-738,共5页Journal of Southeast University：Natural Science Edition

基　　金：浙江省交通运输厅科技计划资助项目(2010H63);浙江大学建筑工程学院-华汇工程设计集团研究中心研究基金资助项目

摘　　要：为研究铰接预应力混凝土空心板梁桥沿铰缝产生裂缝的病害机理及其加固方案,以某装配式空心板桥为背景,通过利用实体单元对包括企口铰缝在内的准确模拟,建立空间有限元模型进行数值分析.通过分析控制截面处相关应力值,得出铰缝处横向应力超标为产生此病害的主要原因;在此基础上,提出采用增设横向预应力体系进行加固和改善桥梁横向受力的2种方案,并对其进行数值分析和比较.结果表明,所提出的加固方案均能有效减少铰缝间混凝土的横向拉应力,改善结构的整体受力;在距梁底25 cm处设置相应的横向预应力钢筋的加固效果更加明显,且在耐久性与安全性方面更具优势.To ascertain the crack mechanism along the hinge joints of fabricated PC（prestressed concrete） hollow slab beam bridges and the strengthening method,a typical fabricated hollow slab beam bridge was taken as an example and an accurate three-dimensional finite element model was built by simulating the whole bridge using entity unit.The stresses in the control sections of the bridge were analysed to conclude that the main cause of longitudinal cracks along the hinge joints was the excess of transverse stress.Based on above analysis results,two schemes including adding transverse prestress steel wire system to strengthen and improve the transverse load bearing capacity of such kind of bridges were presented,and numerical analyses and comparison of the two strengthening schemes were conducted.The results show that both strengthening schemes can effectively reduce the transverse tensile stresses in the hinge joints of hollow slab beam bridges and greatly improve the integrity of the bridge.The scheme with the prestressed steel wire set in the area 25 cm from the bottom of the beam is more effective and has more advantages in durability and security.

关 键 词：装配式空心板桥 铰接 空间受力行为 横向体外预应力 加固 

分 类 号：U445.7[建筑科学—桥梁与隧道工程]