超高性能混凝土薄层加固法在槽形梁桥中的应用

发布时间：2018-01-14 16:10

本文关键词：超高性能混凝土薄层加固法在槽形梁桥中的应用　出处：《桥梁建设》2017年05期 　论文类型：期刊论文

【摘要】：预应力混凝土槽形梁桥的主梁连接板在运营过程中易产生开裂病害,为修复桥面板的裂缝,改善桥梁受力,提出超高性能混凝土(UHPC)薄层加固法(在桥面板底部浇筑1层UHPC,与原结构整体受力),以沪嘉高速公路卲藻浜大桥加固项目为背景,论述该方法在该桥加固中的应用。为检验加固效果,采用ANSYS建立甲式桥面板(槽形主梁连接板)的局部有限元模型进行应力分析,并通过荷载试验分析甲式桥面板加固前、后的受力及变形。通过理论和试验分析可知:加固后,在车辆荷载作用下,甲式桥面板的横向应力降至0.5 MPa以下,UHPC层拉应力为2.5MPa;甲式桥面板的横向应变降低了约65%,竖向挠度降低了约60%;UHPC层的应力实测值与有限元理论值基本一致。说明UHPC薄层加固法可有效改善桥面板受力,提高桥面板的刚度,减小桥面板的挠度。
[Abstract]:In order to repair the cracks of the bridge deck and improve the force of the bridge, the main girder connecting slab of prestressed concrete slotted bridge is prone to cracking in the course of operation. This paper presents a thin-layer strengthening method of UHPC (placing 1 layer UHPCat at the bottom of deck slab), which is based on the reinforcement project of HJB Bridge on Hu-Jia Expressway. This paper discusses the application of this method in the reinforcement of the bridge. In order to test the reinforcement effect, the local finite element model of the A-type deck slab (slot girder connecting plate) is established by using ANSYS to analyze the stress. And through the analysis of load test before and after the reinforcement of A-type bridge deck plate force and deformation. Through theoretical and experimental analysis, we can know: after the reinforcement, under the action of vehicle load. The tensile stress of UHPC layer is 2.5 MPA when the transverse stress of A-type bridge deck is less than 0.5 MPa. The transverse strain of A-type bridge deck is reduced by about 65 and the vertical deflection is reduced by about 60. The measured stress of UHPC layer is basically consistent with the theoretical value of finite element method, which shows that UHPC thin layer strengthening method can effectively improve the stress on the deck slab, increase the stiffness of the deck slab, and reduce the deflection of the deck slab.
【作者单位】：同济大学土木工程学院桥梁工程系;同济大学先进土木工程材料教育部重点实验室;上海罗洋新材料科技有限公司;
【基金】：上海浦江人才计划项目(16PJ1409900)~~
【分类号】：U445.72
【正文快照】： 1引言预应力混凝土槽形梁具有建筑高度低、断面空间利用率高、安全防护性能好、外观效果好等优点[1-2],主要应用于铁路桥梁(如沪通长江大桥非通航孔桥[3]及平潭海峡公铁两用大桥[4])和城市轨道交通[5],在公路及城市高架桥梁中的应用还处于初步阶段。由于槽形梁桥板梁薄壁体系

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