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预制冷弯型钢框架在中、低层住宅及商业建筑中应用越来越广泛,主要通过由等间距螺栓连接且由面层包裹的结构板承载。利用框架特点,可通过厂家提供的负载表或试验数据设计构件。如果要获得结构的弹塑性性能,则需要进行有限元分析。由于需要大量单元来模拟构件和结构面层,此类结构的有限元分析耗时很长。介绍了一种通过有限元分析冷弯型钢结构的简化方法。以某1·2m宽、通过冷弯型钢螺栓连接和面层包裹的典型墙面为例,采用16结点壳单元进行模拟,并以刚度退化因子模拟剪力墙的非线性性能。与传统有限元法相比,新方法所需单元数更少。以某单面剪力墙为例进行分析,结果表明:新方法的精确度及效率更高。最后,采用新方法对某3层结构进行非线性分析。
Prefabricated cold-formed steel frames are used more and more in medium- and low-rise residential and commercial buildings and are mainly carried by structural panels that are connected by equally spaced bolts and are covered by surface layers. Using the features of the frame, components can be designed using the load table or test data provided by the manufacturer. If you want to get the structure of the elastoplastic performance, you need to do finite element analysis. Finite element analysis of such structures takes a long time due to the large number of elements required to simulate the component and structural surfacing. A simplified method for analyzing cold-formed steel structures by means of finite element analysis is presented. Taking a typical wall with a width of 1.2 m, which is connected by bolt and surface layer of cold-formed steel, the 16-node shell element is used to simulate and the nonlinear performance of the shear wall is modeled by stiffness degradation factor. Compared with the traditional finite element method, the new method requires fewer units. Taking a single-sided shear wall as an example, the results show that the new method is more accurate and efficient. Finally, a new method is used to conduct a nonlinear analysis of a 3-layer structure.