Seismic evaluation of mid-to high-rise reinforced concrete buildings by the modal pushover analysis procedure with the displacement coefficient method | |
| Author | Hadiwijaya, Mira Kumalasari |
| Call Number | AIT Thesis no.ST-13-04 |
| Subject(s) | Reinforced concrete--Evaluation Tall buildings--Earthquake effects--Evaluation Buildings,--Reinforced concrete--Earthquake effects--Evaluation |
| 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-13-04 |
| Abstract | In this study a new procedure for evaluating the seismic performance of multi-story RC buildings is proposed. This procedure is a combination of the Modal Pushover Analysis (MPA) procedure and the Displacement Coefficient (DC) method. The accuracy and reliability of this new procedure is examined by using four buildings, representing three categories of buildings: mid-rise, moderately high-rise, and high-rise buildings. The examination is conducted by comparing the seismic responses computed by the new procedure with those by the existing ASCE 41-06’s pushover analysis procedure and by the nonlinear response history analysis (NLRHA) procedure. Construction drawings of more than twenty mid-rise to high-rise RC buildings in Thailand are collected, and several key structural indexes such as column’s and wall’s longitudinal and shear reinforcement ratios, typical span lengths between columns, wall thickness, slab type, foundation configuration, etc., are identified and compared. Based on these results, four representative buildings are created to represent symmetric mid-rise buildings, asymmetric mid-rise buildings, symmetric moderately high-rise buildings, and symmetric high-rise buildings, respectively. Since most of these buildings in Thailand are not designed for seismic loading, their seismic performance under the Maximum Considered Earthquake (MCE) of seismic zone I of the UBC 1997 for site class D is evaluated. For the cases of symmetric and asymmetric mid-rise buildings, the results show that the ASCE 41-06 procedure and the new procedure give almost the same seismic responses (story shear, moment, lateral displacement) because these responses are dominated by the first mode. However, these predicted responses are slightly lower (about 20% lower) thanthose obtained from the NLRHA procedure. The discrepancy seems to be caused by the inaccurate DC’s displacement target, which is the result of error in the inelastic to elastic displacement ratio of SDOF system with natural period less than 1 second. For the case of moderately highrise building with natural period longer than 1 second, the seismic responses computed by the new procedure, the ASCE 41-06, and the NLRHA procedures are all agreed well in general. For the case of the high-rise building where the contribution from higher modes is significant, the ASCE 41-06 procedure underestimates the seismic responses since it does not take into account of higher mode effects. The new procedure, on the other hand, significantly overestimates the responses (by about 20-40%). This appears to be caused by the overestimation of the second mode’s responses. The natural period of the second mode is less than 1 second and hence the evaluation might be affected to the error in DC’s displacement target. In conclusion, the new procedure is sufficiently accurate and can be used for the seismic evaluation of mid-rise to high-rise RC buildings. However, its accuracy can be further improved if the procedure for determining displacement target is more accurate. |
| Year | 2013 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-13-04 |
| 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) | Punchet Thammarak;Anwar, Naveed; |
| Scholarship Donor(s) | AIT Fellowship; |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2013 |