Reinforced Concrete Shear Walls with De-Bonded Diagonal Reinforcements for the Damage-Less Reinforced Concrete Building

Abstract eng:
Recently, owners of buildings wish to continue using their buildings with low repair cost even after a severe earthquake. To achieve this, it is necessary to reduce the damage or to ensure good repairability of members. For a reinforced concrete building with a “shear core”, as the core resists most of the seismic force, large shear force and bending moment occurs. Repairability of the core wall is one of the most important factors in order to reuse the building. This paper examines the behavior of shear walls with de-bonded diagonal reinforcements to reduce the damage and so ensure good repairability. Test results showed that the number of cracks differed greatly even for the same load-carrying capacity; the total length of diagonal shear cracks was significantly less for walls with de-bonded diagonal reinforcements. Repair work was easier than with the common parallel reinforced wall. For precast walls, horizontal cracks appeared only at the bottom end of the wall; no diagonal cracks were observed, and these walls were easy to repair. For all specimens except the walls having an orthogonal wall, the maximum load was kept until R = 1/67. For the walls having an orthogonal wall, the load degraded during cyclic loading at R = 1/100 caused by compressive failure of concrete to resist the large amount of tension reinforcements in the orthogonal wall. It is difficult to reuse these walls after large deformation. The load-deflection relationship for all the specimens with diagonal reinforcements showed the slip property after R = 1/100. The equivalent viscous damping factor was smaller than the value of the wall with parallel bars. In conclusion, the newly developed earthquake resisting wall reduces damage, shows good performance, and can be reused even after a severe earthquake.

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