Earthquake resistant design of high-rise buildings using a modified response spectrum analysis procedure | |
| Author | Nguyen Ha Linh |
| Call Number | AIT Thesis no.ST-16-06 |
| Subject(s) | Earthquake resistant design Tall buildings--Earthquake effects |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Structural Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ST-16-06 |
| Abstract | In conventional seismic design of reinforced concrete tall buildings with the core-wall being the main lateral resistant system, the design demands, such as story shear and story moment, are normally calculated using the code based response spectrum analysis procedure. However, this traditional approach may lead to an inadequate and even more than that, unsafe, design because of the fact that the true seismic demand - the maximum inelastic seismic demand caused by the maximum considered earthquake - can be largely above the originally calculated design demands. The cause of this problem is identified by using a decomposition technique which allows more understanding in nonlinear dynamic responses mode by mode. The decomposition technique shows that the same response modification factor applied for each and every mode in the code based response spectrum is not reasonable. Normally, the structure is yielded for first vibration mode, however, for higher modes, the structure has less yielding level or even responses in elastic range. Therefore, the idea of using different response modification factors for each vibration mode is thought about. In this study, the modified response spectrum analysis procedure is developed to overcome the underestimation in seismic demands of code based response spectrum analysis approach. Because that the shear walls are the main lateral resistant system of reinforced concrete tall buildings, the main object is to determine the lateral strength of shear walls at first yielding point, and the full yielding base shear of whole building is expected to be not higher that value much. The lateral strength of shear wall at first yielding point is calculated by using moment-curvature analysis based on the section dimension, the assumed distributed reinforcement of shear wall and the material properties. The response modification factor is the result of the division of the elastic base shear by the full yielding base shear. This procedure is done mode by mode to get different response modification factor for each vibration mode. We can then compare the exact responses from the nonlinear response history analysis method to the ones obtained for each vibration mode. The outcome shows that the seismic demand, from the modified response spectrum analysis approach, are better than the ones obtained from the traditional response spectrum analysis method and are also matching quite well with the true seismic demand. |
| Year | 2016 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-16-06 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Pennung Warnitchai; |
| Examination Committee(s) | Anwar, Naveed ;Punchet Thammarak; |
| Scholarship Donor(s) | AIT Fellowship; |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2016 |