箱梁不同部位裂缝对连续刚构桥的影响分析  

Analysis of the influence of cracks in continuous rigid-framed bridge

作　　者：秦冰冰 王振佳 QIN Bing-bing;WANG Zhen-jia(Henan Provincial Communication Planning&Design Institute Co.,Ltd.,Zhengzhou 450000,China;Henan Province Academy of Engineering Detect Cross Reinforcement Ltd.,Zhengzhou 450000,China;Road&Bridge international Co.,Ltd.,Beijing 100027,China)

机构地区：[1]河南省交通规划设计研究院股份有限公司,河南郑州450000 [2]河南省交院工程检测科技有限公司,河南郑州450000 [3]中交路桥建设有限公司,北京100027

出　　处：《陕西理工大学学报（自然科学版）》2020年第4期55-61,共7页Journal of Shaanxi University of Technology:Natural Science Edition

基　　金：陕西省交通运输厅科技项目(13-25k)。

摘　　要：基于陕西省已运营连续刚构桥裂缝的分布特征,采用MIDAS FEA分别建立设计和开裂两种状态下的空间实体有限元模型,分析各部位各形式裂缝产生前后,连续刚构桥跨中挠度和跨中最大压应力及裂缝周围最大拉应力的变化情况,进而比较出各部位各形式裂缝对连续刚构桥梁的影响程度。结果表明:对跨中挠度和跨中最大压应力产生最不利影响的裂缝主要集中在中跨L/2处,尤其是中跨底板L/2处的横向裂缝;对局部区域产生较大影响的是中跨底板L/2处的横向裂缝、中跨腹板L/3处的竖向裂缝和斜向裂缝。Based on the distribution characteristics of the cracks of continuous rigid-framed bridges which have been in operation in Shaanxi province,using MIDAS FEA software package,a finite element model of a continuous rigid-framed bridge with and without cracks is conducted.Then,the change of the maximum tensile stress around crack and the maximum compression at excessive midspan sag and midspan deflection are analysed before and after cracks at each location are produced.Then,the influence degree of each form crack in various parts of continuous rigid frame bridge is compared.The result shows that cracks in each part of the L/2(especially the transverse cracks in the base plate L/2)is considered to cause the most detrimental consequence on the midspan deflection and the maximum compressive stress in midspan,the transverse cracks in the floor at L/2 and vertical cracks and oblique cracks in L/3 of the web in the middle span are considered to cause the greater adverse impact on the local area of the crack.

关 键 词：连续刚构桥 箱梁裂缝 调查统计 有限元模型 影响程度 

分 类 号：U443.3[建筑科学—桥梁与隧道工程] U448.23[交通运输工程—道路与铁道工程]