PC梁桥斜交混凝土面板在车辆轮压荷载作用下的受力特性

摘要

Aimed at the regular cracks appeared in skewed reinforced concrete (RC ) deck in prestressed concrete (PC) girder bridge ,the deck strains of a girder bridge with 46°skew angle were measured , and the mechanical behaviors of typical skewed reinforced concrete deck subjected to vehicle wheel loads were researched .The results show that the deck strains caused by driving vehicle are low ,and the concrete cracks are impossible induced by vehicle loads lonely , but cyclic loads of vehicle wheels may create cracks or make the existing cracks wider ,longer and visible .The local effects of wheel loads significantly contribute to the total strain response , especially for longer spans and vehicle at mid‐span of bridge . As a part of composite cross section ,the global loading effect of deck depends on the investigated location .The total strain effect subjected to vehicle load increases slightly with skew angle magnitude .%针对预应力混凝土（PC ）梁桥结构斜交桥面出现的经常性裂缝，对一座斜交角为46°的桥梁的桥面应变进行现场实测，通过校验和修正有限元模型研究了典型斜交钢筋混凝土面板在车辆轮压荷载作用下的受力特性。结果表明：行驶车辆引起的桥面应变很小，车辆荷载的单独作用不可能引起混凝土开裂，但是车辆轮压荷载的反复作用可以产生裂缝或使已经存在的裂缝变宽、变长甚至肉眼可见；轮压荷载作用的局部效应对总应变响应的影响很大，特别是对长跨桥梁或车辆在桥梁的跨中位置，桥面作为组合截面的一个组分，其导致的整体效应主要依赖于所研究的位置；车辆荷载引起的总应变效应随着桥面斜交角的增加而略有增加。