连续箱梁裂缝的防治方法探讨

连续箱梁裂缝的防治方法探讨连续箱梁裂缝的防治方法探讨 摘要：预应力混凝土连续箱梁桥在近几十年来以其结构刚度大、行车平顺性好、伸缩缝少和养护简单等一系列优势而进展迅速，在这一过程中，我国的预应力混凝土连续箱梁桥在设计、施工、运营以及养护管理等方面不到位而导致了一系列桥梁病害。桥梁病害中尤以箱梁腹板斜裂缝的产生和进展较为普遍，而且易影响桥梁的正常运营以致承载能力的破坏。因此，分析斜裂缝的产生机理和影响因素，进而为病害桥梁进行有效的维修加固务必引起足够的重视。 关键词：预应力；腹板斜裂缝；主拉应力 Abstract: the prestressed concrete continuous box girder bridge in recent decades with its structure stiffness big, smooth driving, less expansion joints and simple maintenance and so on a series of advantages and development is rapid, in this process, our prestressed concrete continuous box girder bridge in the design, construction, operation and maintenance management does not reach the designated position and led to a series of bridge diseases. Especially in the box girder bridge diseases in the redesign of the cracking of the development and the more common, and likely to affect the normal operation of the bridge that the destruction of the carrying capacity. Therefore, analysis the cracks of the mechanism and influencing factors, then for disease effectively repair bridge reinforcement be sure to cause enough attention. Keywords: prestressed; Webs diagonal crack; Principal tensile stress 中图分类号：TU378 文献标识码： A 文章编号： 一、预应力混凝土连续箱梁桥的进展 20 世纪 30 年代，由于高强钢丝和高强水泥的使用，预应力混凝土结构最终以自重较轻、刚度大以及抗震、抗裂性能好等优点而独占鳌头，使预应力混凝土技术得到广泛的应用。我国第一座混凝土箱梁桥为山东济宁跃进桥，采纳 3 跨变截面钢筋混凝土薄壁箱型结构。由于钢筋混凝土结构存在用钢多、自重大、易开裂等缺点，为此，为满足大跨径桥梁进展的需要，使用预应力混凝土是必由之路。此后随着我国国力迅速...