| Title |
Seismic Performance of Steel Plate-Reinforced Composite Coupling Beams with High Performance Fiber-Reinforced Cement Composites |
| Authors |
Yun Hyun-Do ; Kim Sun-Woo ; Jeon Esther ; Park Wan-Shin |
| Keywords |
Steel-plate ; Coupling Beams ; HPFRCCs ; Seismic Performance ; Shear Behavior |
| Abstract |
Reinforced concrete coupled shear walls in tall buildings are known as efficient structural systems to provide lateral resistance to wind and earthquake. The coupling beams connecting two shear walls are normally subjected to very high bending and shear stresses. This paper reports experimental studies to investigate the behavior and shear strength of the steel-plate reinforced concrete coupling beams under cyclic loading. In the test program, two coupling beam specimens are constructed and tested. The important variables in the test program was the use of concrete or high performance fiber-reinforced cementitious composite (HPFRCC) in coupling beams. Precast steel-plate reinforced coupling beams with concrete and HPFRCC (PCB-PC and PCB-PH specimen) were tested to evaluate their failure modes, shear behavior, multiple crack pattern, energy dissipation and bar strain. Based on the experimental results, the response of the coupling beam of specimen PCB-PH is deficient in shear, reaching a maximum shear force in the beam of 773.74kN, representing 140% of specimen PCB-PC. The relative deflection of specimen PCB-PH at ultimate was 16.6mm (Rotation angle=2.77%). Furthermore, PCB-PH represented multiple crack patterns the crack width was 0.4mm at rotation angle 2.0%, while specimen PCB-PC was 3.0mm at that. The results of these experiments demonstrate that it is possible to significantly improve the strength, stiffness, displacement capacity, energy absorption of shear deficient reinforced concrete coupling beams due to bridging of fibers in concrete. |