基于承载力的多层钢木混合结构抗震设计方法

Seismic design method of multi-story steel-wood composite structure based on bearing capacity

钢木混合结构主要由钢框架、内填轻型木剪力墙以及钢木混合楼盖组成。首先基于有限元软件Open Sees建立了钢木混合结构数值模型,并利用钢木混合结构单层足尺试验结果校核数值模型的有效性。继而分别设计了不同内填木剪力墙和钢框架侧向刚度比下的3,6,9层的钢木混合结构,按已验证的数值模拟方法对结构进行建模,并按规范的设计反应谱对20条地震记录进行调幅,对结构进行增量动力分析。根据分析结果,总结了钢框架和内填轻型木剪力墙间的剪力分配规律,定义了剪力分配系数κ,并提出其计算公式;评估了结构的失效概率,进而提出钢木混合结构抗震设计方法,最后给出相应计算实例。

Steel-wood composite structure is mainly composed of steel frame,shear wall filled with light-weight wood and steel-wood composite floor.Firstly,the numerical model of steel-wood composite structure was established based on the finite element software Open Sees,and the validity of the numerical model was checked by the single-layer full-scale test results of the steel-wood composite structure.Then steel-wood composite structures,which have 3,6 and 9 layers with different lateral stiffness ratio from shear walls with filled wood and steel frames,were designed,and the structures were modeled according to verified numerical simulation method,and the amplitudes of 20 seismic records were adjusted according to the design reaction spectrums of the code,and the incremental dynamic analysis of structure was conducted.According to the results of the analysis,shear force distribution rules between the steel frame and shear wall filled with light-weight wood was summed,and the shear force distribution coefficient κ was defined,and the calculation formula was put forward.The failure probability of the structure was evaluated,and then the seismic design method of steel-wood composite structure was put forward,and finally corresponding calculation examples were given.