Abstract
A cast‐steel joint is always used as an important component for the safety of the whole structure at key points, and the capability of the joint is important for the cast‐steel joint. This paper conducts an experimental and numerical study on a 1/2 scale model of a joint in a real project. The experiment is used to validate the numerical model and then make further studies on the behavior of the joint by using a numerical method. Combining the result of the scale model test and numerical analysis shows that the joint can bear the prescribed load and it is still in the elastic stage. This paper also discusses the influence of the absence of the secondary moment, torque, and shear force. For the core area of the joint, the secondary moment and torque have little effect on the stress distribution, and the axial force of the secondary branches can increase the capability of the joint. But the secondary shear forces do have some effect on the stress of core area, and an enhancement coefficient is used to enlarge the axial force and moment to cover the absence of shear in the test.
Highlights
Cast-steel members are widely used in many major projects
Before we carry out the experiment, a preliminary finite element (FE) analysis is used to con rm the secondary load. e main loads include the axial force of N1, N2, N3, N4, and the y direction moment of N4. e other moment and all the shear forces and torque are all considered as the secondary loads
They are considered as secondary loads, and an enhancement coe cient is used to insure the safety of the joint. e load on N5 is too small, and the cross section of N5 is much smaller than the main branch. e result of preliminary FE analysis proves that N5 can be ignored in the real test
Summary
Cast-steel members are widely used in many major projects. It can be used as stiffeners, connectors, or joints in the steel structure. Du et al [6] performed research on tree-like column cast-steel joints and summed up a formula for predicting the capacity of caststeel joints with branches under eccentric forces through an experiment and numerical analysis. To ensure that the joint can satisfy the requirement of the construction project, an experiment based on a 1/2 scale model of the cast-steel joint was carried out according to Technical Specification for Application of Connections of Structural Steel Casting [13]. We conduct an experiment to validate the numerical model, and make further studies on the behavior of the joint by using a numerical method. e influence of the secondary load to the capability of the joint is discussed by using the numerical method. is part mainly discusses how the secondary moment, torque, shear, and axial force from the secondary branches of the joint influence the stress distribution of the core area of the joint
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