The top concrete slab of double steel and concrete composite continuous beam will crack under tension in the negative bending region. 2-span double steel-concrete composite continuous beam specimens are simulated considering tensile strain softening by ANSYS. The distribution of cracks and their width are measured and obtained. There is a good agreement between the test measurement and the numerical simulation, which ver ifies the validity of the model. The effect to the concrete deflection and crack is analyzed by changing the thick ness of the bottom concrete slab and the concrete ultimate tensile strain. By using least squares method, the curve fitting is done for the load-deflection curve as well as the load-maximum crack width curve, and the corre sponding calculation formulas are derived.%钢-混凝土双面组合连续梁负弯矩区上混凝土板受拉会产生裂缝.利用ANSYS有限元软件,考虑了混凝土的拉应变软化特性,对钢-混凝土双面组合2跨连续梁模型进行数值模拟分析,得到了上混凝土板裂缝分布和宽度.将计算结果与实测结果进行比较,验证了该模型的有效性.通过变换下混凝土板厚度和混凝土极限拉应变值,分析其对双面组合梁挠度和裂缝的影响；采用最小二乘法,对荷载-挠度；荷载-最大裂缝宽度曲线进行拟合,得出相应的计算公式.
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