大斜度桥梁爬模模板侧压力研究及其结构优化

发布时间：2018-04-26 07:18

本文选题：爬模 + 大斜度　；参考：《中南大学》2014年硕士论文

【摘要】：摘要：全自动液压爬模系统是用于桥梁施工中塔柱成型的先进机械装备。目前研究仅限于直立爬模,对于大斜度爬模系统的研究设计鲜有涉及,同时模板侧压力未有明确计算方法。本文针对大斜度爬模模板的侧压力及其结构,从方案设计、模板侧压力、爬模刚度、结构优化等方面展开研究。本文主要工作内容和创新点如下： (1)分析大斜度爬模系统的结构,确定爬模的施工工艺,指出大斜度爬模设计的主要关键技术,设计大斜度爬模的总体方案,并对大斜度爬模的工况进行研究。 (2)分析影响爬模模板侧压力的各种因素,建立大斜度爬模模板侧压力仿真模型,进行爬模侧压力仿真分析,并得到侧压力计算方法。 (3)以淮北市相王大桥大斜度爬模为研究平台,设计模板侧压力实验方案,采集上下侧立面模板混凝土侧压力数据,得到侧压力曲线。实验结果与仿真结果基本吻合,且下侧立面最大侧压力约为55.68KN/m2,上侧立面最大侧压力约为53.64KN/m2,与计算值误差最大仅为2.6%,验证了仿真模型的可靠性与准确性。 (4)利用有限元仿真软件,仿真分析大斜度爬模的强度和刚度,得到爬模危险应力集中区域及最大变形量位置,为大斜度爬模的优化设计提供参考。 (5)对大斜度爬模承重系统进行参数化建模,并对其进行结构优化。优化后承重系统的总质量相比未优化前减少6.4%,并有效减少应力集中,最大应力相比优化前减少23.4%。
[Abstract]:Absrtact: automatic hydraulic climbing mould system is an advanced mechanical equipment used in bridge construction. At present, the research is limited to vertical climbing die, but the research and design of large slope climbing die system are seldom involved, and there is no clear calculation method of formwork lateral pressure. In this paper, the lateral pressure and its structure of large slope climbing die are studied from the aspects of scheme design, formwork lateral pressure, climbing die stiffness, structure optimization and so on. The main contents and innovations of this paper are as follows: 1) analyze the structure of the large slope climbing die system, determine the construction technology of the climbing die, point out the main key technology of the large slope climbing die design, design the overall scheme of the large slope climbing die, and study the working condition of the large slope climbing die. 2) the factors affecting the lateral pressure of the climbing die are analyzed, the simulation model of the lateral pressure of the large slope climbing die is established, the simulation analysis of the lateral pressure of the climbing die is carried out, and the calculation method of the lateral pressure is obtained. Based on the large slope climbing model of Xiangwang Bridge in Huaibei City, the experimental scheme of formwork lateral pressure is designed, and the lateral pressure curve is obtained by collecting the lateral pressure data of the upper and lower facade formwork concrete. The experimental results are in good agreement with the simulation results, and the maximum lateral pressure on the lower facade is about 55.68 KN / m2, the maximum lateral pressure on the upper facade is about 53.64 KN / m2, and the maximum error from the calculated value is only 2.6, which verifies the reliability and accuracy of the simulation model. 4) using finite element simulation software, the strength and stiffness of climbing die with large slope are simulated and analyzed, and the region of dangerous stress concentration and the position of maximum deformation of climbing die are obtained, which provides a reference for the optimization design of climbing die with large slope. 5) parameterized modeling and structural optimization of large slope climbing die bearing system. After optimization, the total mass of the load bearing system is reduced by 6.4%, and the stress concentration is reduced effectively, and the maximum stress is reduced by 23.4% compared with that before optimization.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.57

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