半刚接钢框架内填钢筋混凝土剪力墙结构超强系数的概率法研究

发布时间：2018-05-29 08:10

本文选题：半刚接钢框架 + 内填RC墙　；参考：《建筑结构学报》2017年10期

【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。
[Abstract]:The super-strength coefficient of the semi-rigid steel frame filled reinforced concrete shear wall (PSFRCW) structure is greatly affected by the material mechanical properties and the variation of the geometric size of the members. The Latin hypercube sampling method takes into account the randomness of mechanical properties of steel, steel and concrete materials in PSFRCW structure, as well as the variation of the thickness of RC wall, the flexural stiffness and flexural bearing capacity of semi-rigid joints. Combined with GB50011-2010 "Code for Seismic Design of buildings", four groups of 160 PSFRCW structural examples were designed, and the effects of story number and seismic fortification intensity on the superstrength coefficient of the structure were analyzed. The capability curves of 160 PSFRCW cases under the uniform distribution and generalized multiplier horizontal force distribution are determined by Pushover method. Based on the probability method, the superstrength coefficient of PSFRCW structure considering the number of floors and the influence of seismic fortification intensity is determined according to the lower confidence limit value of 95% confidence level. The results show that the super-strength coefficient of PSFRCW structure determined by taking into account the geometric dimension variability of materials and members is about 15% larger than that of PSFRCW structure determined by nominal value of material performance and component size. The super-coefficient of the PSFRCW structure determined by the generalized multiplier distribution mode considering the influence of the higher-order mode is smaller than that of the PSFRCW structure determined by the uniform distribution mode. The superstrength coefficient of PSFRCW structure with the same fortification intensity tends to increase with the increase of the number of layers. The superstrength coefficient of PSFRCW structure decreases with the increase of seismic fortification intensity when the number of stories is the same. The superstrength coefficient of PSFRCW structure in 8 degree seismic fortification area and 9 degree seismic fortification area is suggested to be 3.5 and 3.2 respectively.
【作者单位】：苏州科技大学土木工程学院;苏州科技大学江苏省结构工程重点实验室;
【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)
【分类号】：TU398.2

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