蒙山人行索桥大体积混凝土温度裂缝控制技术研究

发布时间：2018-05-10 14:07

本文选题：悬索桥 + 混凝土　；参考：《山东大学》2015年硕士论文

【摘要】：蒙山天蒙景区人行索桥混凝土部分体积巨大,施工过程中由于混凝土浇筑引起的水化热将对成桥质量产生巨大影响,尤其是锚碇和索塔部分,因此设计及施工等方面都应当格外重视温度控制。本项目对天蒙人行索桥施工期温度场、温度应力进行了模拟,制定了大体积混凝土浇筑方案,并根据工程实际有针对性的提出了防裂措施,保证了施工质量。本文取得的主要成果如下：1、项目以热量守恒原理为基础推导混凝土导热方程及混凝土瞬态温度场方程,开展温度场等效传导方程扩展分析以满足数值仿真需求。基于结构特点设计分层、分段浇筑、通水冷却等不同工况,通过数值模拟结果制定大体积混凝土浇筑方案。2、项目根据工程特点提出天蒙人行索桥大体积混凝土施工浇筑过程中温度、应力双控原则。目前常用的传统计算公式只指出温度值与浇筑层厚度有关,不能考虑分段对温度场的影响,而项目计算结果更为准确、全面。现行规范只对最大温度变化值进行了控制,传统公式计算也只能进行温度计算。项目成果能够同时对温度场、应力场进行分析,且从计算结果分析中可以看出大体积混凝土施工中对温度应力的控制更加关键。
[Abstract]:The concrete part of the pedestrian cable bridge in the Tianmeng scenic spot of Mengshan is huge in volume. The heat of hydration caused by concrete pouring in the construction process will have a great impact on the quality of the bridge, especially the Anchorage and the cable tower. Therefore, the design and construction should pay special attention to temperature control. This project simulates the temperature field and temperature stress during the construction period of Tianmen people's Bank Cable Bridge, formulates the pouring scheme of mass concrete, and puts forward the crack prevention measures according to the actual project, which ensures the construction quality. The main achievements of this paper are as follows: 1. Based on the principle of heat conservation, the heat conduction equation of concrete and the transient temperature field equation of concrete are derived, and the expansion analysis of equivalent conduction equation of temperature field is carried out to meet the needs of numerical simulation. Based on the structural characteristics of the design layered, piecewise pouring, water cooling and other different conditions, According to the characteristics of the project, the principle of double control of temperature and stress during the construction of mass concrete of Tianmeng cable bridge is put forward. At present, the traditional calculation formula only points out that the temperature value is related to the thickness of the pouring layer, and the effect of the subsection on the temperature field cannot be considered, but the result of the project is more accurate and comprehensive. The current code only controls the maximum temperature variation, and the traditional formula can only calculate the temperature. The results of the project can analyze the temperature field and the stress field at the same time, and from the analysis of the calculation results, we can see that the control of the temperature stress in the mass concrete construction is more critical.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.57

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