MPC复合材料加固空心板梁桥静载试验研究  

Study of Static Tests for Using MPC Composite Material to Strengthen Void Plate Girder Bridge

作　　者：谷丹丹[1] 孙全胜[1] 

机构地区：[1]东北林业大学,黑龙江哈尔滨150040

出　　处：《世界桥梁》2015年第6期88-92,共5页World Bridges

摘　　要：为研究MPC复合材料加固空心板梁桥的有效性,在某跨径13m的空心板梁桥主梁跨中11m范围内浇筑MPC复合材料进行加固,桥梁加固前与加固后分别进行静载试验,并采用有限元法建立加固前后主梁的有限元模型,分析加固前后主梁的挠度、裂缝和应变的变化。分析结果表明:工况1(跨中最大弯矩横向对称加载)、工况2(跨中最大弯矩横向偏载加载)下主梁加固后的挠度较加固前分别降低了13.4%、12.6%,加固后主梁的挠度明显减小;在试验过程中,加固后主梁裂缝未见明显变化,裂缝区应变水平降低,较好地抑制了原有裂缝的发展;工况1、工况2下主梁加固后的应变较加固前分别降低了13.75%、14.79%,加固后主梁受拉区应变显著降低;加固后校验系数改善率最大为13.89%,该加固方法能够有效地提高桥梁的承载力和刚度。To study the efficiency of using MPC composite material to strengthen void plate girder bridge,within the 11 marea of the midspan of the main girder of a 3×13 mvoid plate girder bridge,the MPC composite material was cast for the strengthening purpose.Static tests were done before and after the strengthening,and the finite element method was used to establish the models of the main girder before and after the strengthening,to analyze the variation of main span deflection,cracking and strain.The results of the analysis indicate that under two load cases（load case1 is the transverse symmetrical loading with maximum midspan bending moment and the load case 2 is the transverse eccentric loading with maximum midspan bending moment.）,the deflection of main girder reduces by 13.4% and 12.6%,respectively,compared with the data before the strengthening,and the deflection of the main girder after strengthening is distinctively declined.During the process of the tests,the cracking of the main girder after the strengthening did not show distinct variation,the strain level in the cracking area is decreased and the propagation of the original cracking is better curbed.In the contexts of load case 1 and load case 2,the strain of the main girder after the strengthening decrease 13.75% and 14.79%,respectively,compared with data before the strengthening,and the strain in the tensile area of the main girder is obviously decreased.The verification coefficient is improved by a maximum rate of 13.89% after strengthening and the method is able to effectively improve the load bearing capacity and stiffness of the bridge.

关 键 词：空心板梁桥 MPC复合材料 加固 挠度 裂缝 应变 荷载试验 有限元法 

分 类 号：U448.212[建筑科学—桥梁与隧道工程] U445.72[交通运输工程—道路与铁道工程]