| Title |
Evaluation of Flexural Performance of Reinforced Concrete Shear Walls According to Flexural Retrofit by Wall End Excavating |
| Authors |
Cho, Ui-Jin ; Kim, Su-Yong ; Bae, Baek-Il ; Choi, Chang-Sik |
| DOI |
https://doi.org/10.5659/JAIK_SC.2020.36.4.123 |
| Keywords |
Reinforced concrete; Shear wall; Flexural retrofit; Wall end retrofit; Flexural performance |
| Abstract |
The purpose of this study is to analyze the method of retrofitting flexural strength and the flexural performance of retrofitted shear walls.
There are various ways to reinforce the flexural strength of reinforced concrete shear wall structural systems that have already been built, in
the case of that, the external force is increased, and the internal force is insufficient. However, there are various problems, such as excessive
flexural stiffness after reinforcement and increasing the thickness and length of the wall. We have developed a retrofit method to solve these
problems. The wall end is excavated to place the required vertical rebars, and concrete is poured after placing rebars. This is the same
concept as creating wall end boundary elements later on. We also studied the anchorage method of reinforcement and the interaction method
between the retrofitting end and the existing wall. The flexural test results for the reinforced concrete shear wall using the studied retrofit
method can be predicted according to the sectional analysis and FEM analysis, and there are differences in the plastic hinge length, crack
propagation, stiffness degradation and energy dissipation due to the bending depending on the vertical rebar ratio of wall end. |