摘要
对《高层民用建筑钢结构技术规程》(JGJ 99—98)中钢框架内嵌带竖缝钢筋混凝土剪力墙的等效交叉支撑和等效剪切板模型进行考察,指出了在确定等效构件时考虑钢框架梁剪切变形的必要性,同时指出两种模型均不能正确地给出钢框架梁的剪力,也不能反映钢框架梁弯曲变形对整体刚度的影响。因此提出壁式框架的计算模型,对各部分的刚度给出了计算建议,对模拟钢框架内嵌带竖缝钢筋混凝土剪力墙肢的壁柱,通过对轴压刚度取小值以实现带竖缝钢筋混凝土剪力墙不承担竖向荷载的设计要求。对壁式框架模型和两种等效模型进行比较表明,在层数少、剪切变形占主导地位时,壁式框架模型的刚度略小;层数增加,三种模型结果相似。但壁式框架模型能够给出钢框架梁的剪力,并反映钢框架梁变形对抗侧刚度的影响。
This paper discusses analytical models for frame-slit-wall system suggested by ＂Technical specification for steel structure of tall building（JGJ 99--98）＂ and points out the necessity of considering shear deformation of web of steel beams when detennine the section of equivalent cross bracing or shear plate. The models suggested by JGJ 99--98 cannot predict the actual shear forces in steel beams, whose bending deformation is not included either. A wall-column model is presented and the rigidities of various parts in this model are proposed. A very low axial rigidity is assigned to the wall-columns modeling the slit walls to implement the design philosophy of carrying no vertical loads by slit wall. Comparison among those three models is carried out and it is found that when the number of stories is small, the wall-column models predict lowest lateral stiffness. As the height of the structures increases, three models predict nearly the same lateral stiffness. However, the wall-column model can correctly predict the internal forces and deformations of each member in the model, thus implies an improvement over the cross bracing or shear plate models.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2006年第5期39-46,共8页
Journal of Building Structures
