轻钢-混凝土混合结构周期折减系数研究

Study on the period reduction factor of light gauge steel-concrete mixed structure

轻钢-混凝土混合结构是一种既符合中国国情,又适宜工业化和模块化生产的新型结构体系。该体系中的轻钢次结构能增大混凝土主结构的抗侧刚度,采用只考虑主结构的简化模型进行设计分析时,可采用周期折减系数来考虑这种影响。推导了2层或3层轻钢次结构抗侧刚度以及轻钢-混凝土混合结构周期折减系数简化计算公式;在混合框架试验的基础上,用ABAQUS有限元软件建立了轻钢-混凝土混合框架的精细化分析模型和简化分析模型,试验结果和模拟分析结果吻合较好;通过有限元模拟分析,验证了轻钢次结构抗侧刚度和混合结构周期折减系数简化计算公式的正确性。

Light gauge steel-concrete mixed structure is a novel structural system which not only suits the Chinese practice but also meets the industrialization and modularization of building construction.The light-gauge steel substructure of the mixed structure system will increase the lateral stiffness of the main concrete structure.When the simplified model with only the main structure is adopted in design analysis,this effect can be taken into account by the period reduction factor.The simplified formulas of both the lateral stiffness of 2 or 3 story light steel wall substructure and the period reduction factor of the mixed structure were derived in this paper.Based on the test results,the refined and the simplified model of the light steel-concrete mixed frame were established by using ABAQUS software.The numerical results agree well with the experimental ones.Finally,the proposed simplified formulas of substructure lateral stiffness and period reduction factor were verified using FEM stimulations.