Abstract
The extended end-plate connections provide excellent performance in resisting seismic loads in high-risk areas. Most scholars’ experiments and finite element studies on this type of joint are focused on the method of applying displacement loads on the beam tip, while the method of applying displacement on the column side has not been the subject of further study. However, the load transmission mechanism of this type of connection is not completely consistent in actual engineering, as the design concept of “strong column weak beam” does not apply to all joints. Therefore, in this paper, the lateral displacement of the applied column is used to simulate the seismic horizontal force to study the mechanical properties of the connection joints of the “weak column and strong beam” under the limit state of earthquake action. Based on the two internal columns (IC-EP1/2) and two edge columns (EC-EP1/2), the failure modes, strength, stiffness, moment–rotation curve, skeleton curve, ductility, and energy dissipation of this type of connection were studied. Experiment results indicated that this type of connection features semi-rigid and partial strength joints. The connection rotation angle of all specimens in the test exceeds 0.05 rad, which suggests it is an ideal seismic joints. Besides, the relationship between the thickness of the end-plate and the diameter of the bolt has a greater impact on the failure mode of the joint. The finite element (FE) analysis models were established for the above connection. The numerical model was validated against experimental results and showed acceptable consistency.
Highlights
The steel structure has been widely used in the building due to its favorable stiffness and strength, especially in the seismic design of high-rise buildings
The moment–rotation function relationship can be considered to be roughly linear before the rotation angle is 0.005 rad
With the increase of the layer angular displacement, the moment–rotation curve turns to the x-axis, and the connection rotation stiffness gradually degraded
Summary
The steel structure has been widely used in the building due to its favorable stiffness and strength, especially in the seismic design of high-rise buildings. Steel frames are easy and time-efficient to assemble, and good performance can be expected at a relatively low cost [1]. As an important part of the structure, the beam–column joints were spliced together by welding in the early days. These joints were designed to be rigidly connected, which has flaws including complex configuration, a long construction period, and being difficult to maintain and repair at later stages. The welding residual stress cannot be ignored, as it makes brittle failure more likely to occur.
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