| dc.description.abstract | Ductile coupled shear wall is the best seismic girders, the results of the seismic is outstanding, making the structure of the building effective against devastating earthquakes. It is advantage is the increase of the building is resistance against horizontal shear force.
Because of the need of underground parking lot, holes are needed to be drilled through ductile couple shear wall for the use of stairwells, passages, and elevators. So the ductile couple shear walls system is needed to be connected by coupling beam to fulfill the needs of space. However, due to the provisions of ACI 318-14, the aspect-ratio of coupling beams is less than 2 must be configured to meet the specification of the design of diagonal bars cage. It will lead to in poor quality of construction because the complex construction of diagonal bars cage. And the nominal shear strength and its upper limit of ACI 318-14 are too conservative, engineers difficult to design an appropriate coupling beams. In addition, in order to meet the seismic intensity of the requirements in high-rise RC building, part of the material use the new high-strength materials, and try different designs of diagonal bars, expect effective use of high-strength materials, thereby reducing the amount of material, and raise environmental awareness.
In this study, five reinforced concrete coupling beams which aspect-ratio is 1.5 are made as specimens. The experiment was carried out through the morph of dual-zone rate and the condition of without applying axial force after cyclic loading test and analytical methods to investigate diagonal reinforcement in different yield strength and design of diagonal bars, and to observe the situation of the new high-strength material used to coupling beams. In addition, this study also checked the type of diagonal bars and nominal shear strength under the specification of ACI 318-14.
The test results show high strength coupling beams which aspect-ratio is 1.5 still show more than 6% ultimate drift ratio, and coupling beams with bundled diagonal bars is one of feasible type of diagonal bars, in addition, the use of high strength diagonal bars can reduce reinforcement ratio, improved construction issues, and show quite well the seismic behavior. | en_US |