【摘要】 针对现浇楼板中板筋对纵向梁抗弯能力的提高作用,采用ABAQUS进行不同轴压比下的RC空间框架结构非线性分析,通过不同节点处的梁、柱钢筋应力对比,讨论了不同轴压比对应的结构和同一结构中不同节点位置在实现"强柱弱梁"上的难易程度以及梁端塑性铰的出现条件。研究结果表明,轴压比对板筋在纵向梁抗弯能力中参与程度的影响较大,低轴压比的结构比高轴压比的结构更容易出现梁端塑性铰;同一结构中内节点对应的纵向梁端比外节点更难出现塑性铰;为实现"大震不倒",建议在满足现行结构设计规范提出的相关要求外,对同一节点处的梁、柱端实际承载能力进行复核,使得考虑了现浇楼板参与作用后的梁端实际承载力依然小于柱端实际承载力。更多还原

【Abstract】 As slab reinforcement will make the longitudinal beam overstrengthen in cast-in-place RC frame structures,a series of RC frame structures with different axial compression ratios are simulated by ABAQUS.The influences of axial compression ratios on the participation extent of the slab reinforcement in longitudinal beam overstrength are studied.The actualization of strong-column and weak-beam philosophy is analyzed in the RC frame structures with different axial compression ratios and at different connections.The occurring condition of a plastic hinge at beam end is discussed.It indicates that the axial compression ratios can greatly influence the participation extent of the slab reinforcement and it is easier for the occurring of plastic hinges at beam end in the RC frame structures with low axial compression ratio than that with high axial compression ratios.Moreover,it is more difficult for the occurring of plastic hinges at beam end at interior connections than that at exterior connections in the same structure.In order to actualize the no collapsing target of structures in strong earthquakes more effectively,it is recommended that the actual capacity of the beam end with considering the slab participation should be still smaller than the actual capacity of column end at the same connection.更多还原