SIMULATION AND CALCULATION METHOD OF LONG-TERM BEHAVIOR OF STEEL-CONCRETE COMPOSITE BEAMS
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摘要: 为评估混凝土时变特性对组合梁长期性能的影响,以某钢-混凝土组合梁长期试验为对象,进行有限元模拟分析,通过定义混凝土材料徐变函数、有效模量法和调整钢混结合面抗剪刚度3种方法模拟混凝土的长期性能,根据计算分析提出一种组合梁长期挠度的计算方法。结果表明:采用3种模拟方法均能较好地模拟组合梁的长期变形,但只调整钢混结合面抗剪刚度的模拟方法不能用于分析结构的局部应力分布;计算得到的组合梁长期挠度与试验实测值吻合良好,并与多个不同组合梁试验结果一致。Abstract: In order to evaluate the influences of time-dependent properties of concrete to composite beams, a finite element numerical analysis was carried out to simulate the long-term performance of steel-concrete composite beams. The long-term properties of concrete was simulated by 3 methods:defining the creep behavior of concrete; effective modulus method; adjusting the shear resistance of interface. Based on the results of test and simulation, a simplified calculation method for the long-term deflection of composite beam was introduced. The results showed that the integral long-term performance of composite beam could be well simulated by all the methods. The method of simply adjusting the shear resistance of interface could not be used for analyzing the distribution of local stress. With comparison to several long-term composite beam experiments, it indicated that the calculating results could agree well with the experimental results.
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