摘要
为充分实现框架结构的"强柱弱梁"耗能机制,需要考虑填充墙、现浇T形截面梁及其翼缘现浇板内与梁肋平行配置的钢筋对结构整体超强系数的影响。考虑抗震设防烈度、结构层数等因素,严格按我国抗震规范设计了15个典型钢筋混凝土框架结构,对结构进行Pushover分析,得到了各种结构在非弹性阶段由于内力重分布而形成的超强性能。结果表明:结构设计考虑填充墙、现浇楼板的影响,会提高结构的整体超强能力,结构整体超强系数均随着抗震设防烈度的增高而减小,且先随结构层数的增大而减小,结构层数大于8层后,又随结构的层数的增大而增大。可以保守地认为,分别按抗震设防烈度6,7,8度设计的结构,同时考虑填充墙和现浇板影响时,结构整体超强系数分别至少要达到5.0,3.0,2.0。
In order to make strong-column-weak beam failure modes of frame structures come true,the effects of infill walls and slab-bars which are parallel to the longitudinal bars in T-beams on global overstrengh of RC frames were investigated. The 15 RC frame structures with different number of stories located on different sites were designed according to Chinese seismic code. The global overstrength factors of RC frames attributing to redistribution of internal forces were studied by Pushover analysis. It is shown that the global overstrengh is improved while the effects of infill walls or slab-bars are considered. The global overstrength factor decreases as the seismic fortification intensity increases,and decrease as the number of structural story increases firstly and then increases as the number of story increases when the story number of structure is more than 8. It is suggested that,the minimum overstrength factor of RC frame structures while the effects of infill wall and slab-bars are considered simultaneously at seismic fortification intensities 6,7,8 should be 5. 0,3. 0,2. 0,respectively.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2014年第8期30-36,共7页
Journal of Building Structures
基金
国家自然科学基金项目(51178150
50978080
90715021)
土木工程防灾国家重点实验室开放课题(SLDRCE12-MB-04)
教育部高等学校博士学科点专项科研基金(20112302110005)
