单索面宽体斜拉桥抗倾覆性能研究
发布时间：2019-03-22 05:53
【摘要】：单索面斜拉桥凭借其独特的造型被越来越多的被城市桥梁采用,但城市桥梁交通量大且偏载的问题突出。此外,单索面斜拉桥不能通过索面的空间效应提供抗扭刚度,一般认为桥梁的扭转刚度主要由主梁来提供,且单索面宽体斜拉桥与常规梁桥相比跨度和桥宽均较大,有必要对单索面宽体斜拉桥抗倾覆性能进行细致的计算分析。论文依托某一单索面宽体斜拉桥工程,分析其最大悬臂阶段和成桥阶段的抗倾覆扭转性能,并基于该桥进行抗倾覆抗扭转性能参数化分析。具体内容主要有:1、对现有常用建模计算方法进行比较,选择一种合适的计算方法用于研究单索面宽体斜拉桥抗倾覆性能。根据比较分析,确定使用板壳理论建立分析模型;2、依托某单索面宽体斜拉桥,利用有限元分析软件对其成桥阶段和最大悬臂施工阶段进行分析,计算偏载引起的倾覆问题,以及截面扭转角等关键指标,分析桥梁偏心荷载引起的扭转对桥梁关键构件受力的影响。根据计算分析,得出桥梁抗倾覆安全系数高;3、为进一步探明宽箱梁各细部尺寸对抗倾覆性能影响的敏感性,选取不同的顶板、中腹板、次腹板、斜腹板和底板的厚度对其进行参数化分析,计算分析箱梁各个截面参数对桥梁倾覆扭转受力的敏感性,分析得出底顶板对截面扭转角影响最明显;4、为进一步探明中央双索面相比中央单索面对抗倾覆的影响,选取若干中央双索面索面间距离,对比与其对应的偏载引起的支座反力、截面扭转角和扭转应力。根据分析得出,索面距离从0.1cm变化到300cm主梁承担扭矩减少不到1%;5、分析塔墩梁连接方式对桥梁抗倾覆性能的影响,另外对支座横向距离进行参数化分析,分析各个参数对桥梁倾覆受力的敏感性。根据分析得出,塔墩梁连接方式的改变对截面扭转角影响很小,增大支座横向距离对桥梁抗倾覆性能有显著提高。
[Abstract]:Single-cable plane cable-stayed bridge is more and more adopted by urban bridges because of its unique shape, but the problem of large traffic volume and partial load of urban bridges is prominent. In addition, single-cable-plane cable-stayed bridge can not provide torsional stiffness through the spatial effect of cable surface. It is generally believed that the torsional stiffness of the bridge is mainly provided by the main beam, and the span and width of the single-cable-plane wide-body cable-stayed bridge are larger than those of the conventional girder bridge. It is necessary to calculate and analyze the anti-overturning performance of single-cable-plane wide-body cable-stayed bridge in detail. Based on the engineering of a cable-stayed bridge with a wide cable surface, the anti-overturning torsional performance of a cable-stayed bridge at the maximum cantilever stage and the completion stage is analyzed, and the parametric analysis of the anti-overturning torsional performance is carried out based on the bridge. The main contents are as follows: 1. Compare the existing modeling methods and select a suitable method to study the anti-overturning performance of single cable-plane wide-body cable-stayed bridge. 2. According to the comparative analysis, the plate-shell theory is used to establish the analytical model. 2, relying on a cable-stayed bridge with a wide cable surface, the finite element analysis software is used to analyze the bridge completion stage and the maximum cantilever construction stage, to calculate the overturning problem caused by the bias load and the key indexes such as the torsion angle of the cross-section. The influence of torsion caused by eccentric load on the force of key members of bridge is analyzed. According to the calculation and analysis, it is concluded that the bridge anti-overturning safety factor is high; 3. In order to find out the sensitivity of different dimensions of wide box girder against overturning performance, the thickness of different roof, middle web, sub-web, oblique web and bottom plate are selected to carry out parametric analysis, and the results are as follows: (1) the thickness of roof, middle web, sub-web, oblique web and bottom plate are analyzed. The sensitivity of each section parameter of box girder to the torsional force of the bridge overturning is calculated and analyzed. The results show that the bottom roof has the most obvious influence on the cross-section torsion angle. 4. In order to find out the influence of the central double cable plane on the anti-overturning compared with the central single cable plane, the distance between the central double cable planes is selected to compare the bearing reaction force, the cross section torsion angle and the torsion stress caused by the corresponding bias load. According to the analysis, the cable-plane distance from 0.1cm to 300cm main beam is reduced by less than 1%. 5. The influence of the connecting mode of tower pier and beam on the anti-overturning performance of the bridge is analyzed. In addition, the parametric analysis of the lateral distance of the support is carried out, and the sensitivity of each parameter to the overturning force of the bridge is analyzed. According to the analysis, it is concluded that the change of connecting mode of tower piers has little effect on the cross-section torsion angle, and increasing the lateral distance of the support can significantly improve the anti-overturning performance of the bridge.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.27
本文编号：2445303
[Abstract]:Single-cable plane cable-stayed bridge is more and more adopted by urban bridges because of its unique shape, but the problem of large traffic volume and partial load of urban bridges is prominent. In addition, single-cable-plane cable-stayed bridge can not provide torsional stiffness through the spatial effect of cable surface. It is generally believed that the torsional stiffness of the bridge is mainly provided by the main beam, and the span and width of the single-cable-plane wide-body cable-stayed bridge are larger than those of the conventional girder bridge. It is necessary to calculate and analyze the anti-overturning performance of single-cable-plane wide-body cable-stayed bridge in detail. Based on the engineering of a cable-stayed bridge with a wide cable surface, the anti-overturning torsional performance of a cable-stayed bridge at the maximum cantilever stage and the completion stage is analyzed, and the parametric analysis of the anti-overturning torsional performance is carried out based on the bridge. The main contents are as follows: 1. Compare the existing modeling methods and select a suitable method to study the anti-overturning performance of single cable-plane wide-body cable-stayed bridge. 2. According to the comparative analysis, the plate-shell theory is used to establish the analytical model. 2, relying on a cable-stayed bridge with a wide cable surface, the finite element analysis software is used to analyze the bridge completion stage and the maximum cantilever construction stage, to calculate the overturning problem caused by the bias load and the key indexes such as the torsion angle of the cross-section. The influence of torsion caused by eccentric load on the force of key members of bridge is analyzed. According to the calculation and analysis, it is concluded that the bridge anti-overturning safety factor is high; 3. In order to find out the sensitivity of different dimensions of wide box girder against overturning performance, the thickness of different roof, middle web, sub-web, oblique web and bottom plate are selected to carry out parametric analysis, and the results are as follows: (1) the thickness of roof, middle web, sub-web, oblique web and bottom plate are analyzed. The sensitivity of each section parameter of box girder to the torsional force of the bridge overturning is calculated and analyzed. The results show that the bottom roof has the most obvious influence on the cross-section torsion angle. 4. In order to find out the influence of the central double cable plane on the anti-overturning compared with the central single cable plane, the distance between the central double cable planes is selected to compare the bearing reaction force, the cross section torsion angle and the torsion stress caused by the corresponding bias load. According to the analysis, the cable-plane distance from 0.1cm to 300cm main beam is reduced by less than 1%. 5. The influence of the connecting mode of tower pier and beam on the anti-overturning performance of the bridge is analyzed. In addition, the parametric analysis of the lateral distance of the support is carried out, and the sensitivity of each parameter to the overturning force of the bridge is analyzed. According to the analysis, it is concluded that the change of connecting mode of tower piers has little effect on the cross-section torsion angle, and increasing the lateral distance of the support can significantly improve the anti-overturning performance of the bridge.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.27
【参考文献】
相关期刊论文 前2条
1 刘琪;吴忠华;付坤;;独塔单索面混合梁斜拉桥偏载扭转效应分析[J];桥梁建设;2011年06期
2 强士中;邢兵;李小珍;雷虎军;肖海珠;;乌苏大桥大挑臂钢箱组合梁扭转性能试验研究[J];桥梁建设;2014年05期
，本文编号：2445303
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