Posted on October 20th, 2010 by Guch

当前位置:首页/研究动向/基于Pushdown分析的RC框架抗连续倒塌承载力研究

基于Pushdown分析的RC框架抗连续倒塌承载力研究
  发表日期:2011-4-27

基于Pushdown分析的RC框架抗连续倒塌承载力研究

李易, 陆新征, 叶列平, 陈适才
沈阳建筑大学学报(自然科学版), 2011, 27(1): 10-18.

摘 要:目的 分析了典型钢筋混凝土框架的抗连续倒塌承载力规律,为抗连续倒塌设计和研究提供参考. 方法 采用非线性静力Pushdown方法,对不同抗震设防烈度的非整体现浇板框架和整体现浇板框架的抗连续倒塌承载力进行了分析和对比. 结果 层间不均匀内力是导致多层框架梁共同作用时相对承载力偏低的原因. 梁机制和悬链线机制作用下框架结构的抗倒塌承载力分别由框架梁的抗弯承载力和抗拉承载力决定. 结论 抗震设计增强了框架在梁机制作用下的抗连续倒塌承载力,而对悬链线机制作用下的抗连续倒塌承载力提高有限. 楼板显著增强了框架在梁机制作用下的抗连续倒塌承载力,而对悬链线机制作用下的抗连续倒塌承载力的增强效果则取决于参与工作的楼板宽度.
关键词:混凝土框架;抗连续倒塌承载力;非线性静力Pushdown分析;抗震设计;楼板

下载论文全文/Download PDF Version

Study on Progressive Collapse-Resisting Capacity of RC Frame Structures Based on Pushdown Analysis

Li Yi,Lu Xinzheng,Ye Lieping, Chen Shicai
Journal of Shenyang Jianzhu University (Natural Science), 2011, 27(1): 10-18.

Abstract:The law of the progressive collapse (PC) -resisting capacity of the typical reinforced concrete (RC) frames is analyzed to provide a reference for PC design and researches. The PC-resisting capacity of the typical non-integrated slab and the integrated cast-in-situ slab reinforced concrete (RC) frames, with different seismic fortification levels, is compared by the nonlinear static Pushdown method. It is found that the uncoordinated development of internal forces of beams on different stories leads to the lower PC-resisting capacity of the frame when multi-storey frame beams commonly resist PC. The PC-resisting capacity of the frame under the beam action and catenary action is dominated by the flexural capacity and tensile capacity of frame beams respectively. After seismic design, the PC-resisting capacity of the frame under the beam action is significantly enhanced but the capacity of the frame under the catenary action is improved slightly. The PC-resisting capacity of the frame under the beam action is significantly enhanced by integrated slab but for the capacity of the frame under the catenary action the enhancement extent relates to the effective flange width of slabs.
Keywords:concrete frame; progressive collapse-resisting capacity; nonlinear static Pushdown analysis; seismic design; slab