Abstract
This paper aims to study the seismic performance of exterior beam-column joints in building frames strengthened by ferrocement using nonlinear finite element analysis. Firstly, the proposed model was used to predict experimental results successfully. Secondly, a parametric study was carried out to assess the behavior of such joints with different additional variables. The studied variables were the level of axial loading on the column, compressive strength of specimens, percentage of longitudinal reinforcement in the beam, and orientation of expanded wire mesh in ferrocement layer, for specimens strengthened by different number of ferrocement layers. It was found that strengthening specimens by ferrocement reduced the effect of axial loading level and longitudinal steel ratio in the beam on the ultimate load of studied specimens. In addition, changing the orientation angle of expanded wire mesh from 60ยฐ per ferrocement layer to 45ยฐ has a minor effect on the ultimate load but it has a significant effect on the ductility of studied specimens. The effect of orientation angle became less significant on the ductility with increasing the number of ferrocement layers used for strengthening. These findings would be helpful to the engineers to develop suitable, feasible and efficient upgrading technique for poorly designed building frame structural joints in seismic zones.
Highlights
D Understanding the response of beam-column joints in reinforced concrete building frames E during loading is crucial to the development of an overall efficient and safe structure
This paper aims to study the seismic performance of exterior beam-column joints in P building frames strengthened by ferrocement using nonlinear finite element analysis
Venkatesana et al [13] carried out experimental tests and numerical simulations using ANSYS 10.0 [17] for the seismic performance of exterior beam-column joints before and after strengthening with ferrocement jackets
Summary
D Understanding the response of beam-column joints in reinforced concrete building frames E during loading is crucial to the development of an overall efficient and safe structure. Venkatesana et al [13] carried out experimental tests and numerical simulations using ANSYS 10.0 [17] for the seismic performance of exterior beam-column joints before and after strengthening with ferrocement jackets They found that the analytical shear strength predictions were in line with the test results and the strengthened specimens exhibited better structural performance than the un-strengthened ones. N a correlative study based on the envelope of lateral load deflection hysteresis of A test specimens, was conducted to verify the analytical model with the experimental results for exterior beam-to-column joints strengthened by ferrocement and was reported elsewhere [22]. The aim of this study is to help the engineers to develop Asuitable, feasible and efficient upgrading technique for structural joints in existing building frames, designed poorly in accordance with the old design codes, in seismic zones
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