为了研究水平荷载作用下钢筋混凝土现浇楼板对框架结构屈服机制的影响，首先验证了适用于ABAQUS非线性纤维梁单元用户材料子程序的准确性，在此基础上，建立带有楼板及其钢筋的框架模型和空框架模型，分析结构变形方式、各榀框架节点梁柱内力分配以及节点受拉区板筋的参与工作范围。研究表明，现浇楼板影响空间框架结构“强柱弱梁”屈服机制的实现；框架节点受拉区板筋内力和参与工作范围随着框架侧移的增加而增大；梁端受拉区的有效翼缘宽度取梁侧6倍板厚并不全面，应结合不同侧移和设防烈度进行全面分析。%In order to study the failure mode of the cast-in-place RC frame structure under horizontal load, the accuracy of the nonlinear fiber beam element which is suitable for ABAQUS software is verified first. Then, regular RC frame structures and RC frame structures with monolithic slab are established separately to analyze the structural deformation patterns, the internal forces of frame beams and columns and the effective flange width at the tension zone of the frame joints. Numerical results indicate that it is difficult for the RC frame structure with monolithic slab to achieve the failure mode of “strong column-weak beam”. Besides, the slab rebar force and the effective flange width at the tension zone of the frame joints become greater as the frame displacement increases. What’ s more, the effective flange width at the tension zone of the frame joints cannot be approximated suggested as 6 times slab thickness, lateral displacement and other seismic fortification intensity should be taken into account.
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