摘要
半刚接钢框架内填钢筋混凝土剪力墙(PSFRCW)结构的超强系数受材料力学性能及构件几何尺寸的变异性影响较大。采用的Latin超立方抽样方法考虑了PSFRCW结构中型钢、钢筋及混凝土材料力学性能的随机性,以及内填RC墙厚度、半刚性节点的抗弯刚度及受弯承载力的变异性,结合GB 50011—2010《建筑抗震设计规范》设计了4组共计160个PSFRCW结构算例样本,分析了层数、抗震设防烈度对结构超强系数的影响。采用Pushover方法确定了160个PSFRCW算例分别在均匀分布及广义乘方水平力分布模式下的能力曲线。基于概率方法按置信水平为95%的单侧置信下限值确定了PSFRCW结构考虑层数、抗震设防烈度影响的超强系数。研究表明:考虑材料及构件几何尺寸变异性所确定的PSFRCW结构的超强系数较按材料性能及构件尺寸名义值所确定的PSFRCW结构的超强系数值约大15%。考虑高阶振型影响的广义乘方分布模式确定的PSFRCW结构的超强系数值要小于按均匀分布模式确定的PSFRCW结构的超强系数值。设防烈度相同时,PSFRCW结构的超强系数随层数的增加呈增大趋势。层数相同时,PSFRCW结构的超强系数随抗震设防烈度的增加呈降低趋势。在8度抗震设防区,PSFRCW结构的超强系数建议取为3.5;在9度抗震设防区,PSFRCW结构的超强系数建议取为3.2。
The randomness of material property and component dimension has significant influence on the overstrength factor of partially-restrained steel frame with RC infill walls （PSFRCW）. The Latin-hyper cubic sampling approach was adopted to take into account the randomness of material property and component dimension, including mechanical property of steel, steel bar and concrete, thickness of RC infill wall, rotation stiffness and bending bearing capacity of partially-restrained connection. A total of 160 PSFRCW specimens with four groups were designed according to the GB 50011-2010 ＇Code for seismic design of buildings , and the effect of story number and seismic precautionary intensity were also considered. The capacity curves of 160 PSFRCW structures were developed by pushover analysis under the two lateral loading distribution modes, i. e., uniform lateral loading distribution and generalized power loading distribution modes. The analytical results show that the overstrength factor of PSFRCW considering material property and component dimension randomness is 15% larger than the nominal values of PSFRCW structure. The overstrength factor determined by generalized power loading distribution mode, which considered the effect of higher modes, is less than the overstrength factor values from uniform lateral loading distribution mode. At the same seismic precautionary intensity, the overstrength factor of PSFRCW takes on the increasing tendency with the increase of story number. With the same story number, the overstrength factor of PSFRCW exhibits the decreasing tendency with the increase of seismic precautionary intensity. The suggested overstrength factor of PSFRCW is 3.5 and 3.2 for seismic zone 8 and 9, respectively.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2017年第10期68-77,共10页
Journal of Building Structures
基金
国家自然科学基金项目(51108292)
江苏省"青蓝工程"中青年学术带头人项目
江苏省研究生培养创新工程项目(KYLX_1287
SJLX15_0638)
关键词
半刚接钢框架
内填RC墙
材料性能
几何尺寸
概率方法
超强系数
随机性
partially-restrained steel frame
RC infill wall
material property
dimension
probability method
overstrength factor
randomness
