Journal of Structural and Construction Engineering

Journal of Structural and Construction Engineering

Numerical investigation of seismic improvement solutions of cold joints in concrete moment frames

Document Type : Original Article

Authors
amir atashi 1
Vahid Reza kalatjari 2
Ebrahim Zamani beydokhti 3
1 PhD candidate, Department of civil engineering, Shahrood University of Technology, Shahrood, Iran
2 Associate Professor, Department of Civil Engineering. Shahrood University of Technology, Shahrood, Iran
3 Assistant Professor, Department of Civil Engineering. Shahrood University of Technology, Shahrood, Iran
10.22065/jsce.2024.455887.3405
Abstract
In this research, the effect of cold joint and the use of different solutions to improve and reduce the effect of cold joint in reinforced concrete frame have been investigated. For this purpose, after validating a concrete beam-to-column connection with a cold joint in Abaqus software, 20 models of a one-span, one-story concrete frame were modeled in Abaqus software in different situations. Three types of cold joint reinforcement including shear key, additional rebar and steel box in the cold joint location with different dimensions and geometries were created. All the models were subjected to cyclic loading, and hysteresis envelope diagram, maximum load capacity and resistance loss factor were extracted from the models and compared. The results obtained from this research showed that by creating a cold joint, the maximum load carrying capacity will decrease by 15%. Also, by using the three proposed solutions, the use of boxes, shear keys, and additional rebars at the cold joint location, it is possible to improve the capacity of the maximum load-carrying capacity, among which the greatest impact is related to the use of cans and the least impact is It was to use additional rebar. In models with boxes, with increased cross-section and web thickness, the bearing capacity increased compared to the cold joint model and in some cases compared to the model without cold joint. In the models with shear key, the bearing capacity increased compared to the model with cold joint by increasing the cross-sectional area and decreasing the length of the shear key. In the models with additional rebars, the increase in load capacity compared to the models with cold joints was small, and this increase was improved by increasing the diameter of the rebars.
Keywords
Cold joint
concrete moment frame
shear key
Additional rebar
Seismic behavior

Subjects

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  • Receive Date 02 June 2024
  • Revise Date 31 July 2024
  • Accept Date 23 September 2024