罗马假日小区筏板基础温度场分析与裂缝控制

发布时间：2018-03-08 19:04

本文选题：筏板基础　切入点：温度场　出处：《辽宁工程技术大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着高层建筑的增多,筏板基础的应用也越来越广泛,而这些筏板基础基本上都是用大体积混凝土浇筑而成,如果施工中未采取有效的预控措施,就很容易产生裂缝。所以筏板基础大体积混凝土的裂缝控制是筏板基础混凝土质量控制的重中之重,而混凝土水化热产生的热量是导致筏板基础裂缝出现的重要因素,所以正确预测由水化热导致的混凝土的温度场变化情况,并采取一些切实可行的针对措施,可有效避免裂缝的产生。本文通过采用有限元软件ADINA对筏板基础进行温度场模拟,并对罗马假日商住小区筏板基础进行温度实测,其模拟结果与测温数据基本吻合,说明采用有限元软件ADINA进行的数值模拟,可以有效地预测大体积混凝土的温度变化趋势。为类似的筏板基础大体积混凝土工程温度分布情况研究提供参考,为在施工中更有针对性地进行裂缝控制提供理论依据。在使用ADINA软件模拟过程中,改变混凝土与周围保护层的导热系数,得出了提高二者导热系数可以微小改变混凝土的最高温度以及内外最大温差的结论另外,本文根据数值模拟及实际测温的结果,分析了大体积混凝土裂缝产生的原因,并采取了相应的控制措施,尤其是在提高导热系数方面,从材料、配合比以及施工几方面采取措施后,有效地预防和控制了裂缝的发生。说明这些措施采取后,效果还是比较好的,可以为今后类似工程的施工提供参考。
[Abstract]:With the increase of high-rise buildings, raft foundation is more and more widely used, and these raft foundations are basically made of mass concrete. If effective pre-control measures are not taken in construction, Therefore, the crack control of raft foundation mass concrete is the most important part of raft foundation concrete quality control, and the heat produced by concrete hydration heat is an important factor leading to the occurrence of raft slab foundation crack. Therefore, the temperature field of concrete caused by hydration heat can be predicted correctly, and some practical measures can be taken to avoid cracks. In this paper, the finite element software ADINA is used to simulate the temperature field of raft foundation. The temperature of raft foundation in Roman holiday residential area is measured, and the simulation results are in good agreement with the temperature measurement data, which shows that the finite element software ADINA is used to carry out the numerical simulation. The temperature variation trend of mass concrete can be predicted effectively, which provides a reference for the study of temperature distribution in similar raft foundation mass concrete projects. In order to provide theoretical basis for crack control in construction, the thermal conductivity of concrete and surrounding protective layer is changed in the process of simulation with ADINA software. It is concluded that the maximum temperature and the maximum internal and external temperature difference of concrete can be slightly changed by increasing their thermal conductivity. In addition, according to the results of numerical simulation and actual temperature measurement, the causes of cracks in mass concrete are analyzed in this paper. The corresponding control measures are taken, especially in improving the thermal conductivity, after taking measures in the aspects of material, mix ratio and construction, the occurrence of cracks is effectively prevented and controlled. The effect is still good, can provide reference for the construction of similar projects in the future.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU755;TU755.7

【参考文献】