超大吨位钢绞线斜拉索静力性能计算分析

发布时间：2018-01-15 22:26

本文关键词：超大吨位钢绞线斜拉索静力性能计算分析　出处：《重庆交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：东水门大桥和千厮门大桥合称为重庆两江大桥，，二者均为单索面矮塔斜拉桥，斜拉索为139Φ15.2mm的超大吨位钢绞线斜拉索，单根索的极限承载力36140kN，现有的试验设备不能满足如此大吨位斜拉索的静载试验。本文选取具有相同锚孔拓扑结构的31孔、73孔和139孔锚具为研究对象，采用ANSYS软件，利用锚具的对称性建立31孔、73孔和139孔三个钢绞线斜拉索的1/12精细三维锚具模型，模型中考虑了夹片与锚板的摩擦接触、锚板材料的弹塑性和几何非线性。采用与静载试验中相同的加载方式，对加载过程中锚板的受力进行了分析，并通过对31、73和139孔锚具在各加载阶段中应力、应变等参数的对比，探索利用较小吨位钢绞线斜拉索代替超大吨位钢绞线斜拉索进行静载性能试验的可行性。本文首先模拟了139孔斜拉索锚具在加载过程中的力学行为，通过钢绞线回缩值、锚板应力、应变和变形的分析，得到了其在加载过程中的分布和发展规律。然后，进行了31孔、73孔和139孔三个模型计算结果的对比分析，得到的主要结果如下： ①在钢绞线回缩值对比中，73孔与139孔的最大差异率为6.82%，31孔与139孔的最大差异率为10.61%； ②在锚板整体分析对比中，进行了锚板最大应力和塑性应变、大端应力和塑性应变、小端轴向变形三个方面的比较，比较结果表明31孔、73孔与139孔在加载过程中力学行为相似，但在数值上73孔更接近139孔； ③在锚板局部分析对比中，选取中心孔、次边孔、边孔间最薄弱区域及锚板最外侧为研究对象，进行了各加载阶段中应力和塑性应变的对比，结果表明73孔与139孔结果吻合度较高，而31孔与139孔结果有一定的差异。以上计算分析结果表明，利用73孔钢绞线斜拉索代替139孔钢绞线斜拉索进行静载性能试验是可行的。最后通过73孔钢绞线斜拉索模型计算结果与试验结果的对比，验证了本文数值模型的正确性。
[Abstract]:Dongshuimen Bridge and Qianshuomen Bridge are called Chongqing Liangjiang Bridge, both of them are single cable plane low tower cable-stayed bridge, and the stay cable is 139 桅 15.2mm super large tonnage steel strand stay cable. The ultimate bearing capacity of single cable is 36140 KN, and the existing test equipment can not meet the static load test of such a large tonnage stay cable. In this paper, 31 holes 73 holes and 139 holes anchors with the same structure of anchor hole topology are selected as the research objects. The 31 holes are established by using the ANSYS software and the symmetry of the anchors. The 1/12 fine 3D Anchorage model of three steel strands with 73 holes and 139 holes is presented. The friction contact between the clamp and the anchor plate is considered in the model. The elastic-plastic and geometric nonlinearity of the anchor plate material. The loading mode is the same as in the static load test, the stress of the anchor plate during the loading process is analyzed, and through the 31. By comparing the stress and strain parameters of 73 and 139 hole anchors in different loading stages, the feasibility of static load performance tests with small tonnage cable cable cable instead of super tonnage cable cable is explored. In this paper, the mechanical behavior of the 139-hole cable Anchorage in the loading process is simulated, and the stress, strain and deformation of the anchor plate are analyzed through the analysis of the retractive value of the steel strand, the stress of the anchor plate and the deformation of the anchor plate. The law of distribution and development in the loading process is obtained. Then, the results of 31 holes 73 holes and 139 holes model are compared and analyzed. The main results are as follows: (1) the maximum difference rate between 73 hole and 139 hole in the comparison of retractive values of steel strand is 6.82% and 10.61% between 31 hole and 139 hole; 2 in the whole analysis and comparison of anchor plate, the maximum stress and plastic strain of anchor plate, large end stress and plastic strain and small end axial deformation are compared. The results show 31 holes. The mechanical behavior of 73 holes is similar to that of 139 holes during loading, but the numerical value of 73 holes is closer to 139 holes. 3 in the local analysis and comparison of anchor plate, the weakest area between center hole, secondary hole, edge hole and the outermost part of anchor plate are selected as the research objects, and the stress and plastic strain in each loading stage are compared. The results show that the results of 73 holes and 139 holes agree well, while the results of 31 holes and 139 holes have some difference. The results show that it is feasible to use 73 hole steel strand cable instead of 139 hole cable to carry out static load test. Finally, the correctness of the numerical model is verified by comparing the calculation results with the experimental results.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27

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