建立3个钢筋混凝土空间框架模型分别代表实际的带楼板空间框架结构、设计采用的纯杆计算模型和考虑部分板筋参与作用的设想计算模型，采用ABAQUS进行仿真模拟，通过考察各模型在侧向荷载下的屈服机制、塑性铰开展情况、梁柱钢筋应力对比和板筋应力情况，研究现浇楼板和结构整体效应对框架梁端抗弯能力产生的影响。研究表明，现浇楼板的存在使得实际带楼板框架结构与设计采用的纯杆空框架模型屈服机制不一致；梁端抗弯能力发生超强的原因不仅在于现浇楼板板筋的参与作用，还在于整浇后的结构整体作用；采用有效翼缘宽度考虑板筋作用时，取为6倍板厚不能全面概括实际框架的受力情况，应考虑结构整体效应、侧移等因素的影响。

Three models of 3D cast-in-place RC frame structures are simulated in ABAQUS. In the three models, one represents the actual RC frame structure with monolithic slab, one represents the open frame structure used in structural design currently, which means truss structure at the stage of calculating internal forces of frame beams and columns, and the third one represents the open frame structure which takes into account some slab reinforcement in the rectangle section of frame beam to consider the slab participation in the flexural capacity of frame beam. By investigating the failure mode of these three models, the development of plastic hinges, the reinforcement stress of beam, column and slab in the models, the influence of monolithic slab to the bending resistance of beam end is studied. It shows that the existence of slab makes the failure mode of actual RC frame structure different from the design criteria of strong column weak beam. It also indicates that the slab participation in the bending resistance of beam end is not only expressed in the slab reinforcement but also in the structure integral performance. Besides, when using the effective flange width to consider the slab reinforcement participation, the structure integral performance, lateral displacement and other relevant factors should be taken into account.

国家自然科学基金资助项目（51208114）；福州大学引进人才科研启动基金资助项目（XCR-1046）；福州大学科技发展基金资助项目（2012-XQ-34）