基于ABAQUS钢—混凝土组合梁温度应力研究

发布时间：2018-04-24 15:46

本文选题：钢-混凝土组合梁 + 瞬态温度应力　；参考：《长安大学》2015年硕士论文

【摘要】：近年来随着施工技术的不断进步和新材料的不断涌现,组合结构得到了很大的发展,比如在超高层建筑中、大跨度桥梁中的应用。其中,钢-混凝土组合梁发挥了混凝土与钢材各自的优点,取得了良好的经济效益,在工程中得到广泛应用。由于混凝土与钢的导热性的差异性,钢-混凝土组合梁的温度应力与混凝土结构的温度应力有着很大的区别。在温差荷载作用下,组合梁混凝土翼板内部温度变化明显滞后于外界温度变化;同时混凝土水化热产生的热量一部分通过抗剪连接件传导,与混凝土板接触的钢梁也起到了一定的热量传导作用。由于不同的温度梯度的温度应力相差较大;温度应力降低截面的抗裂性,影响结构的整体性和耐久性,因此通过现场实测和理论计算得到大跨钢-混凝土组合梁温度应力,研究其在温差荷载作用下温度应力分布及规律十分必要。本文以西安某十字路口20m跨度人行天桥(钢-混凝土组合梁)为工程背景,通过“时间-温度-应力”测试,对钢-混凝土组合梁的温度场进行实测分析。本文采用有限元软件ABAQUS进行钢-混凝土组合梁瞬态温度场仿真分析,同时考虑抗剪连接件的作用。在建立模型时,采用实体单元类型进行三维全尺寸建模,利用参数化模型对不同材料属性的单元赋予不同的参数,添加相应的约束进行计算;可得到这样的结论:有限元理论分析结果与实际工程拟合较好;组合结构的温度应力的分布于变截面处的值较大;栓钉的导热作用对于钢-混凝土组合梁的温度场的分布有很大的影响。通过分析温度应力分布规律,可以较为直观的预测其裂缝出现的位置及裂缝的走向。
[Abstract]:In recent years, with the continuous progress of construction technology and the emergence of new materials, composite structures have been greatly developed, such as the application in super-tall buildings and long-span bridges. Among them, steel-concrete composite beams play the respective advantages of concrete and steel, obtain good economic benefits, and are widely used in engineering. Because of the difference of thermal conductivity between concrete and steel, the temperature stress of steel-concrete composite beam is very different from that of concrete structure. Under the action of temperature difference load, the variation of internal temperature of concrete wing slab of composite beam lags behind that of external temperature obviously, and the heat produced by hydration heat of concrete is partly transmitted through shear connection. Steel beams in contact with concrete slabs also play a role in heat transfer. Because the temperature stress of different temperature gradient is quite different, the temperature stress reduces the crack resistance of the section and affects the integrity and durability of the structure, so the temperature stress of the long-span steel-concrete composite beam is obtained by field measurement and theoretical calculation. It is necessary to study the temperature stress distribution and law under the action of temperature difference load. Based on a 20m span footbridge (steel-concrete composite beam) at a crossroads in Xi'an, the temperature field of steel-concrete composite beam is measured and analyzed by time-temperature-stress test. In this paper, the transient temperature field of steel-concrete composite beam is simulated by finite element software ABAQUS, and the effect of shear joint is considered. In the process of building the model, the solid element type is used to model the whole dimension, and the parameterized model is used to assign different parameters to the units with different material properties, and the corresponding constraints are added to calculate the model. It can be concluded that the results of the finite element theory fit well with the actual engineering, the temperature stress of the composite structure is larger than that of the variable section. The thermal conductivity of bolt has great influence on the distribution of temperature field of steel-concrete composite beam. By analyzing the distribution of temperature stress, the location of cracks and the strike of cracks can be predicted intuitively.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU398.9

【引证文献】