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温度荷载是造成施工期大体积混凝土开裂的主要原因。为了研究大体积混凝土的开裂风险,将影响混凝土温度场和应力场的物理力学参数作为随机变量,以混凝土抗拉强度与最大拉应力之差作为判断大体积混凝土开裂与否的准则,并依此建立功能函数。通过数值试验建立功能函数的响应面方程,以解决原功能函数无法显示表达的问题,最后采用JC法求解混凝土开裂可靠度指标。计算结果表明,与Monte-Carlo法的计算结果相比,所提出的大体积混凝土开裂风险计算方法得到的失效概率相对误差在4%以内,且计算效率高,精度满足要求,可应用于实际工程。
Temperature load is the main reason for the cracking of mass concrete during construction. In order to study the risk of cracking of mass concrete, the physical and mechanical parameters that affect the temperature field and stress field of concrete are taken as random variables. The difference between the tensile strength and the maximum tensile stress of concrete is taken as the criterion to judge the cracking of mass concrete. Create a function. The response surface equation of the functional function is established through numerical experiments to solve the problem that the original functional function can not display the expression. Finally, JC method is used to solve the reliability index of concrete cracking. The calculation results show that compared with the Monte-Carlo method, the relative error of the failure probability calculated by Monte Carlo method is less than 4% and the calculation efficiency is high and the precision meets the requirements, which can be applied to practical engineering .