线性荷载下混凝土梁抗拉强度幂值函数预测模型

Function Prediction Model of Power Beam Value of Tensile Strength of Concrete Under Linear Load

研究线性荷载下混凝土梁抗拉强度幂值函数预测模型,对筋混凝土柱的拟静力试验进行模拟分布,构建钢筋混凝土柱状结构下的应力损伤模型,实现对混凝土梁抗拉强度幂值函数预测,对提高建筑物的强度具有重要意义。进行混凝土抗拉强度线性徐变的本构关系分析,综合考虑混凝土的材料非线性效应与时间非线性效应,根据低短期荷载模型设计混凝土结构的非线性徐变多块结构化网格,得到线性荷载下的混凝土梁多块结构化网格模型。试验采用4点弯曲分级加载方式,分别是试件DSHCW-1、试件DSHCW-2、试件DSHCW-3和试件DSHCW-4,进行幂值函数预测。得到不同等级地震作用下的剩余抗拉强度与承载力数值分析,构建混凝土的抗拉强度滞回曲线,实验结果得出,采用该试件模型,能有效提高混凝土梁的抗拉强度,通过对幂值函数准确预测,对混凝土梁结构的强度提高有较大贡献,为高层建筑抗震设计计算或加固提供数学模型和理论基础。

The strength of concrete beams under tensile load power linear value function prediction model is studied, to simulate the distribution of the pseudo static tests of reinforced concrete column, construction stress damage model of structure of reinforced concrete columns under the realization of value function, to forecast the power beam concrete tensile strength,to improve the strength of the building is of great significance. Analysis of the constitutive relation of the linear creep of concrete tensile strength, considering the material nonlinear effect and time nonlinear effect of concrete, according to the low short-term load model of nonlinear creep of concrete structure design of multi block structured grid, get the concrete beam multi block structured grid model under linear load. Experiments using 4 point bending multi-stage loading, respectively is DSHCW-1, DSHCW-2 specimens specimens, specimens and specimens of DSHCW-3 DSHCW-4, the exponential value function prediction. Get the capacity and bearing residual tensile strength under different earthquake levels of numerical analysis, the construction of concrete tensile strength hysteretic curve, the result of experiment, using the specimen model can effectively improve the tensile strength of concrete beam, through value function for accurate prediction of power, a greater contribution to improve the concrete structure strength calculation or provide a mathematical model and theoretical foundation reinforcement for the seismic design of high-rise building.