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本文首先以双向板塑性绞线法为背景,通过计算极限荷载判断楼板纵筋屈服,采用数值模拟的办法研究了钢筋屈服后混凝土楼板的裂缝宽度。这种方法基于Houde黏结滑移理论,假定模型条件和加设COMBINE39三维非线性弹簧单元模拟出钢筋与混凝土之间的黏结滑移,滑移产生的单元间相对位移差即为裂缝宽度。同时以工程实测裂缝宽度为依据,检验数值模拟裂缝宽度的可行性,为探究钢筋屈服后混凝土楼板裂缝宽度提供了实际参考价值。
In this paper, the two-way slab plastic stranding method is taken as the background, and the ultimate load is used to determine the longitudinal reinforcement yield. The crack width of the concrete slab after yielding is studied by numerical simulation. This method is based on the Houde theory of bond slippage. Assuming the model conditions and the addition of the COMBINE39 three-dimensional nonlinear spring element, the bond slip between the reinforcement and concrete is simulated. The relative displacement difference between elements resulting from slip is the crack width. At the same time, based on the measured crack width, the feasibility of numerical simulation of crack width is verified, which provides a practical reference value for exploring the crack width of reinforced concrete floor after yielding.