现浇空心板梁桥纵向开裂成因分析与试验研究

发布时间：2018-05-05 14:43

本文选题：桥梁工程 + 现浇空心板　；参考：《公路工程》2017年05期

【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。
[Abstract]:There are many longitudinal cracking problems in existing cast-in-place hollow slab bridge. In order to study the causes of longitudinal cracking of existing cast-in-place hollow slab bridge, finite element method is adopted. The spatial simulation of cast-in-place reinforced concrete hollow slab girder bridge with more longitudinal cracks was carried out to analyze the influence of slab thickness, slab height and width to span ratio on mechanical properties of cast-in-situ hollow slab girder bridge. The calculation results show that the strength and stiffness of the hollow slab bridge can not meet the requirements of the code. The main causes of longitudinal cracking of the bridge are insufficient slab height and wide span ratio, thin bottom slab and small slab height. Long-span cast-in-situ hollow slab girder bridges are prone to longitudinal cracking. The maximum midspan deflection and transverse maximum tensile stress decrease with the thickness of the bottom plate and the height of the plate, and with the increase of the ratio of width to span, the maximum deflection in the span and the maximum tensile stress in the longitudinal direction of the bottom plate decrease, and the maximum transverse tensile stress of the bottom plate increases. At the same time, according to the test and analysis results, the prevention measures of longitudinal cracking of cast-in-place hollow slab girder bridge are put forward.
【作者单位】：中铁五局集团机械化工程有限责任公司;长沙理工大学土木与建筑学院;
【基金】：国家自然科学基金项目(51278072) 湖南交通科技项目(201452)
【分类号】：U445.71;U446.1

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