Earthquake resistant design of high-rise buildings in a moderate seismic hazard region | |
| Author | Rachut Rattanameechai |
| Call Number | AIT Thesis no.ST-13-05 |
| 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-13-05 |
| Abstract | High-rise buildings are the type structure that is required to be designed to resist the lateral dynamic loads caused by wind and earthquake. They are constructed using RC core wall system because it can provide adequate dynamic properties by distributing considerable strength, stiffness, and substantial deformation capacity to the structure. Conventionally, when a high-rise building is designed in a moderate seismic hazard region, the design demands are selected between wind and seismic resistant designs. It is normally found that wind design demand is larger than seismic demand determined by response spectrum analysis (RSA), so the design demand of the high-rise building is controlled by wind design demand by this sense. However, an analysis on a 40-story case study building with RC core wall system, assumed to be located in Bangkok city of Thailand, has shown that the true inelastic seismic demand determined by non-linear response history analysis (NLRHA) is actually much larger than both wind design demand and seismic design demand determined by RSA. Therefore, if the designers only rely on wind design demand, they might end up with an unsafe design. Nevertheless, this problem occurs because of the RSA underestimate the seismic design demand to be less than wind design demand. To investigate the reasons behind large inelastic seismic demands and the underestimation of RSA, the total seismic demand from NLRHA were decomposed into modal responses from each vibration mode by uncoupled modal response history analysis (UMRHA). The modal responses of each vibration were then investigated by comparing to the total seismic demand from NLRHA and comparing to the elastic modal demands from RSA. The investigation has shown that the modal demands from higher modes dominate the other levels of the case study building apart from the base of the core wall where the proposed flexural yielding is set for the desired plastic mechanism. This result in small yielding of the higher modes and the modal demands become very large as they are not effectively suppressed by the base flexural yielding like in the first vibration mode. Thus, leads to the underestimation of RSA procedure as the modal responses of higher modes are not effectively reduced by the same response modification factor. |
| Year | 2013 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-13-05 |
| 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) | Royal Thai Government Fellowship; |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2013 |