港珠澳大桥弧形钢板副格受力分析

发布时间：2018-03-13 04:24

本文选题：弧形钢板副格　切入点：榫槽　出处：《河北工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：港珠澳大桥的东西人工岛基坑围护工程采用大直径钢圆筒结构，相邻圆筒间使用两道弧形钢板副格连接。此结构施工方式简便、效率高，工序少，可以对弧形钢板进行工厂化制作后再整体运输至现场施工，施工难度和材料成本均大幅度降低，所形成的围堰岛壁的止水性能佳，结构稳定性好。本文首先介绍了弧形钢板副格结构受力分析时所采用的三种经典土压力理论以及几种常见情况下土压力的计算方法。然后通过陆地试验对弧形钢板副格结构不同工况下的结构静力分析研究可知，副格振沉完成后试验用榫槽、副格钢材均未发生屈服现象，而当灌水、灌砂后个别测点出现了应力过大的情况，说明在实际工程中，副格结构在振动下沉完成后的中粗砂回填施工中有可能出现破坏现象。其次根据设计资料和实际工况，采用有限元分析方法，针对不同埋深的副格结构进行分析。由分析结果得知三种高度下的副格结构都没有发生屈服，宽榫槽是此结构中受力最大的部位。根据试验结果以及有限元分析结果，提出副格设计优化建议：当副格仓内水头超过一定高度时，加密榫槽和钢管桩间的jk肋，增加榫槽的刚度；在高水头下，钢管桩焊接榫槽的位置可能出现应力集中，建议在该位置布置纵向加强板，，改善应力的分布情况；实际工况下，应合理控制副格舱内的水位；为保证结构的安全可靠，在弧形钢板副格结构高度改变时，可以适当加密榫槽加劲肋。
[Abstract]:The large diameter steel cylinder structure is used in the construction of the East and West artificial Island Foundation Pit of Hongkong-Zhuhai-Macao Bridge, and two arc-shaped steel plates are used to connect the adjacent cylinders. This structure is simple in construction, high in efficiency and less in working procedures. The arc steel plate can be manufactured by factory and then transported to the site. The construction difficulty and material cost are greatly reduced. The wall of the cofferdam has good sealing performance and good structural stability. In this paper, three kinds of classical earth pressure theory and the calculation methods of earth pressure in some common cases are introduced in the stress analysis of arc-shaped steel plate pair lattice structure. Then, the arc steel plate pair lattice structure is not analyzed by land test. The static analysis of the structure under the same working condition shows that, After the vibration sinking of auxiliary lattice is finished, the tenon and tenon groove of auxiliary lattice steel are not yielding, but the stress is too large at some measuring points after irrigation and sand filling, which shows that in the actual engineering, The secondary lattice structure may be destroyed in the middle coarse sand backfill construction after vibration sinking. Secondly, according to the design data and actual working conditions, the finite element analysis method is used. According to the analysis of pair structure with different depth of burying depth, the results show that none of the pair lattice structures at three different heights has yield, and the wide tenon groove is the most stressed part of the structure. According to the test results and the finite element analysis results, the optimum design suggestion of the auxiliary lattice is put forward: when the water head in the pair box exceeds a certain height, the jk rib between the encrypted tenon groove and the steel pipe pile increases the stiffness of the tenon groove; under the high water head, the stiffness of the tenon groove is increased. The stress concentration may appear in the position of welded tenon groove of steel pipe pile. It is suggested that the longitudinal stiffening plate should be arranged in this position to improve the distribution of stress. In actual working conditions, the water level in the auxiliary compartment should be controlled reasonably; in order to ensure the safety and reliability of the structure, When the height of the curved steel plate pair is changed, the stiffening rib can be properly encrypted.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441

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