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Composed of cold-formed steel structural components with high strength, light weight, flexible form , good seismic performance , construction and easy installation , short construction period , etc., in foreign countries has been widely used low-rise houses and villas , and the formation of industrial production . Node is a cold-formed steel system is an important component part of the power transmission system, the core structure of cold-formed steel roof study on seismic performance has a certain practical significance. This article first Larry C steel roof seismic behavior were studied . By changing the bolt spacing, gusset plate thickness , the design of six back to back Larry C steel roof node specimens at low cyclic loading test , based on the study of the ultimate bearing capacity of the roof nodes , capacity degradation, deformation capacity nodes , joint stiffness degradation, ductility, energy dissipation performance indicators related to the seismic performance , obtained at the node under cyclic loading plate distribution of stress and strain fields , as well as different gusset plate thickness , bolt spacing on the mechanical properties of the node effects . By analyzing the test data were obtained six specimens under cyclic loading at low load - displacement hysteretic curves , skeleton curves , stiffness degradation curve. Through experiments that: With the bolt spacing increases, the gusset plate thickness increases, the specimen ultimate load increases accordingly . Design of six members having larger initial stiffness and excellent energy performance, while other properties such as ductility consistent with the general cold node . Second, the use of large general-purpose finite element software ABAQUS for Larry C steel roof node simulation , a total of six semi-detached established node C steel roof three-dimensional parametric finite element model by conducting unit type settings, the definition of material properties geometric model creation , boundary conditions applied , the coupling strength bolted handle , load the system established and a series of work , simulated results consistent with the experimental results . The conclusions of this topic for the engineering field related to the application of cold-formed steel roof to provide a reference node .
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