现浇空心板梁桥纵向开裂成因分析与试验研究  

Cast-in-situ Hollow Slabs Bridge Longitudinal Crack Reason Analysis and Experimental Research

作　　者：雷建华 段君良 何恒波[2] 

机构地区：[1]中铁五局集团机械化工程有限责任公司,湖南衡阳421002 [2]长沙理工大学土木与建筑学院,湖南长沙410004

出　　处：《公路工程》2017年第5期85-89,110,共6页Highway Engineering

基　　金：国家自然科学基金项目(51278072);湖南交通科技项目(201452)

摘　　要：既有现浇空心板梁桥纵向开裂问题较多,为研究既有现浇空心板桥梁纵向开裂的原因,采用有限元方法,对有较多纵向裂缝的某地方公路现浇钢筋混凝土空心板梁桥进行空间模拟,分析底板厚度、板高、宽跨比对现浇空心板梁桥力学性能的影响。计算结果表明,该空心板桥梁强度和刚度均不能满足规范要求,板高度不够和宽跨比较大是该桥梁出现纵向开裂的主要原因;底板较薄、板高较小、宽跨比较大的现浇空心板梁桥极易出现纵向开裂。随着底板厚度、板高度的增大,跨中最大挠度和横向最大拉应力减小;随着板宽跨比的增大,跨中最大挠度和底板纵向最大拉应力减小,底板横向最大拉应力加大。同时根据试验和分析结果,提出了现浇空心板梁桥纵向开裂的防治措施。Based on the finite element analysis soft＂ware , the spatial analysis of the DongGuan lo-cal highway X232 line of a cast- in-place reinforced concrete hollow slabs bridge has carried on the stressand defection distribution characteristics. And it also analyzed the principal cause of longitudinal cracks of the hollow slabs bridge from combining the bridge inspection with load experiment results. The result shows that the cast- in-situ hollow slabs bridge of the thin-bottom , less-height , large-＂wide span ratio cau-ses longitudinal cracks easily. Secondly along with the increase of the bottom plate thickness and slabsheight , the magnitude of maximum deflection and transverse tension stress decreasiincrease of width span ratio , the magnitude of maximum deflection and bottomdecreases , and magnitude of the maximum bottom transverse tensile stress increacause of the large wide span ratio , the transverse stress will be huge , and with less slab height , the strength and stiffness of this hollow slabs bridge structure can not meet the standard requirements. It sug-gests that pasting steel is significant for strengthening the cross section.

关 键 词：桥梁工程 现浇空心板 纵向裂缝 数值模拟 荷载试验 防治措施 

分 类 号：U445.71[建筑科学—桥梁与隧道工程]