简支变连续梁桥支座更换顶升方案对比及受力分析  

Comparison of lifting scheme for replacing bearings of simply supported continuous beam bridge and analysis of stress

作　　者：白杜娟 Bai Dujuan(Shaanxi Kaida Highway and Bridge Construction Co.,Ltd.,Xi'an 710068,China)

机构地区：[1]陕西凯达公路桥梁工程建设有限公司,陕西西安710068

出　　处：《山西建筑》2019年第4期172-175,共4页Shanxi Architecture

基　　金：国家西部交通建设科技项目(2009319812050)

摘　　要：为了选择简支变连续梁桥支座更换顶升合理方案并且研究顶升施工过程结构受力状况,以九谷冲大桥4×30. 0 m支座顶升更换为工程依托,详细介绍了支座更换整体顶升方案和支座更换局部顶升方案,基于有限元软件MIDAS/Civil建立关于全联整体空间的有限元模型对顶升过程墩顶剪力、跨中弯矩和墩顶弯矩等进行了对比分析。研究结果表明:各墩台支座顶升最大行程宜取8 mm;从结构受力角度分析,在两种顶升方案中,整体顶升方案的墩顶弯矩、剪力及跨中弯矩方面变化小于局部顶升方案,通过比较发现整体顶升方案更具有优势。In order to select a reasonable scheme for replacing the support of simply supported continuous girder bridge and to study the structural stress during the construction process, this paper, based on the lifting replacement of the 4×30.0 m support of Jiuguchong Bridge, introduces in detail the overall lifting scheme for replacing the support and the partial lifting scheme for replacing the support. Based on the finite element software MIDAS/Civil, a finite element model for the whole space of the full connection is established. The pier top shear force, mid-span bending moment and pier top bending moment during lifting process are compared and analyzed. The results show that the maximum lifting stroke of each pier and abutment support should be 8 mm. From the point of view of structural stress, the changes of pier top bending moment, shear force and mid-span bending moment of the integral lifting scheme are less than those of the local lifting scheme. Through comparison, it is found that the integral lifting scheme has more advantages.

关 键 词：支座更换 简支变连续梁桥 受力分析 

分 类 号：U448.215[建筑科学—桥梁与隧道工程]