某大跨径连续刚构桥底板崩裂后的结构损伤评估

发布时间：2017-12-28 09:20

本文关键词：某大跨径连续刚构桥底板崩裂后的结构损伤评估　出处：《桥梁建设》2015年03期 　论文类型：期刊论文

【摘要】：为评估某大跨径预应力混凝土连续刚构桥[跨度为(96+132+96)m]底板崩裂后(崩裂长度最长为26.0m,崩裂厚度最大达30cm)的结构损伤程度,确定合理的处理方案,采用MIDAS Civil 2010建立全桥有限元模型,分析了桥梁各种损伤量化参数,建立了损伤模型,对损伤前、后主梁的顶、底板应力进行计算分析。结果表明,在主力+附加力作用下,损伤后主梁底板出现拉应力(0.25 MPa),桥梁损伤较为严重,不能满足《铁路桥涵钢筋混凝土和预应力混凝土结构设计规范》的设计要求。建议后续不仅要对崩裂底板进行修复,而且要对桥梁进行全面的加固改造(如设置体外预应力,增加顶板厚度等),以提高其整体刚度和承载力,保证桥梁结构后续运营的安全。
[Abstract]:For the evaluation of a large span prestressed concrete continuous rigid frame bridge span [(96+132+96) m] (the length of bottom plate after the burst length is 26.0m, the maximum crack thickness 30cm) structural damage degree, determine the reasonable treatment plan, 2010 to establish a finite element model of the whole bridge using MIDAS Civil, analyzes the bridge damage quantitative parameters is established the damage model, the damage before and after the main beam of the roof and floor stress calculation and analysis. The results show that under the action of main force plus additional force, the tensile stress (0.25 MPa) of the main girder and bottom plate is damaged, and the damage of the bridge is more serious, which can not meet the design requirements of the code for design of reinforced concrete and prestressed concrete structures of railway bridges and culverts. It is suggested that not only the cracked floor should be repaired, but also the comprehensive reinforcement and reconstruction of the bridge, such as setting external prestressing and increasing the thickness of the roof, to improve the overall stiffness and bearing capacity, and ensure the safety of the subsequent operation of the bridge.
【作者单位】：云南省保山市重点公路建设管理处;中交第二公路勘察设计研究院有限公司;
【分类号】：U448.23;U445.7
【正文快照】： 1引言随着我国基础设施建设的快速发展,大跨径预应力混凝土连续刚构桥以其结构刚度大、行车平顺性好、伸缩缝少和养护简便等特点,已成为我国铁路、公路建设中最主要的桥型之一[1,2]。随着大跨径预应力混凝土连续刚构桥的大量修建,在底板预应力张拉过程中,很多桥梁不同程度地出

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