混凝土箱梁钢混独塔斜拉桥分析和塔柱钢混结合段详细应力分析

发布时间：2018-06-07 21:12

本文选题：独塔斜拉桥 + 有限元分析　；参考：《西南交通大学》2014年硕士论文

【摘要】：首先,对独塔斜拉桥和混合桥塔进行了简要的介绍。然后,论文以跨径为130+130m独塔斜拉桥为工程背景,提出了混凝土箱梁钢混独塔斜拉桥的结构,对该斜拉桥的混凝土箱梁、钢混桥塔和斜拉索进行方案设计。采用大型有限元分析软件MIDAS/CIVIL2012,建立混凝土箱梁钢混独塔斜拉桥基于梁单元的全桥有限元模型,计算分析成桥运营阶段的恒载、活载、整体升降温、梁体正负温度梯度和风荷载作用下结构效应,依据最不利荷载组合验算了全桥的变形和应力。其次,对成桥状态自振特性进行分析,并采用反应谱方法和时程方法计算分析该桥的地震响应。再次,采用ANSYS有限元软件建立该桥基于实体单元、板壳单元和杆单元的全桥大规模组合单元详细模型,计算分析桥塔钢混结合段在恒载单独作用下、恒载与车道荷载作用下以及恒载与验算荷载作用下的详细应力,着重分析PBL钢筋、混凝土榫和开孔钢板的力学行为,对比了三种不同钢筋直径和开孔板孔径的力学性能。基于上述计算分析,提出钢混结合段优化的建议。
[Abstract]:First, the single-tower cable-stayed bridge and the hybrid tower are briefly introduced. Then, taking 130,130m single-tower cable-stayed bridge as the engineering background, the paper puts forward the structure of the concrete box girder steel-concrete single-tower cable-stayed bridge, and designs the concrete box girder, the steel-concrete bridge tower and the cable-stayed cable of the cable-stayed bridge. The finite element model of the whole bridge of concrete box girder steel-concrete single-tower cable-stayed bridge based on beam element was established by using Midas / CIVIL2012.The dead load, live load and overall rise and drop of the bridge were calculated and analyzed. Under the action of positive and negative temperature gradient and wind load, the deformation and stress of the whole bridge are calculated according to the most unfavorable load combination. Secondly, the natural vibration characteristics of the bridge are analyzed, and the seismic response of the bridge is calculated by using the response spectrum method and time history method. Thirdly, the finite element software ANSYS is used to establish the detailed model of the whole bridge large-scale combined element based on the solid element, the plate shell element and the bar element, and to calculate and analyze the bridge tower steel mixing combination section acting on the dead load alone. The detailed stresses under dead load and lane load, dead load and check load are analyzed in detail. The mechanical behavior of PBL steel bar, concrete tenon and perforated steel plate is analyzed, and the mechanical properties of three kinds of steel bars with different diameter and aperture are compared. Based on the above calculation and analysis, suggestions for optimization of steel-concrete joint section are put forward.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27

【参考文献】