Abstract
In order to realize the design concept of “strengthened column and weakened beam, strengthened connection joints and weakened components” and ensure the improvement of joints’ bearing capacity and the transfer of plastic hinges along beams far away from column ends, this paper proposes a new type of prefabricated beams with strengthen-weaken beam-column connection, and changes multiple parameters. Six connection joint models are designed for finite element analysis. The results show that: JD-1 is located far away from the column end according to the plastic development trend, which is in line with the purpose of transfer of the plastic hinges at the beam end. In addition, the whole column is barely damaged during the whole loading process of this connection joint, and quick recovery after the earthquake could be realized merely by replacing other related components of the joint in the later period. Changes of different parameters also have certain impact on the bearing capacity, seismic resistance and energy dissipation capacity of the joint.
Highlights
There are serious environmental pollution and waste of resources in the development of traditional extensive-style buildings
Through comparative analysis of the hysteretic curves of other joints and that of JD-1, it can be seen that compared with dog-bone weakened beams in figure 3 (a), the peak bearing capacity of beams not weakened is obviously increased by about 11.2%, while the area of hysteresis loops is relatively smaller, indicating that the seismic resistance and energy dissipation capacity is weakened to some extent
This paper, using the finite element method, through the simulated static analysis of reversed cyclic loading applied on the new prefabricated strengthen-weaken columnbeam connection joints, has determined the transfer of plastic hinges as the new joints are under load, and designed six joints by changing the parameters such as whether the beam has dog-bone weakening, the dog-bone weakening length of the beam flange, the dog-bone weakening depth of the beam flange, the thickness of the square steel tube column, and whether to add the diaphragm inside the column
Summary
There are serious environmental pollution and waste of resources in the development of traditional extensive-style buildings. The steel structure has the advantages of light weight, good seismic performance, recyclable resources, reduction of environmental pollution, etc. As its processing plants can realize modular and standardized production of components, the steel structure is the preferred choice for developing industrialized prefabricated buildings [1,2,3]. This paper presents a new type of prefabricated strengthen-weaken beam-column connection joint. The joint is strengthened by the external diaphragms at the column ends and the flange at the beam ends adopts dog-bone weakening. A total of 6 different forms of connection joints between square steel tube columns and H-shaped steel beams are designed for comparative analysis, with emphasis on the impact of these parameter changes on the seismic performance of the new type of joints proposed, including the bearing capacity, stiffness degradation, energy dissipation, etc
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