Application of response spectrum method to a bridge subjected to multiple support excitation | |
| Author | Kang, Kee Dong |
| Call Number | AIT Thesis no. ST-84-10 |
| Subject(s) | Earthquakes and building Bridges |
| Note | A thesis submitted in partial fulfilment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | The earthquake behavior or a four-span continuous girder railway bridge subjected to different earthquake excitations at the supports is investigated using the response spectrum method. The results of the response spectrum method are compared with those obtained from a time history analysis assuming linear behavior of the bridge. In a multiple support response analysis the response may be separated into a pseudo-static and a dynamic part. In the response spectrum methods considered the pseudo-static response remains the same in all cases, how ever, the dynamic part will de pend. on the combination rule adopted. Essentially two different response spectrum methods for multiple support excitations are discussed: (i) single response spectrum with all method. with all supports having the same response spectrum which is obtained by taking the envelope of all support spectra , and (ii) multiple response spectrum method which takes into account different response spectra at each support. Different combination rules for the superposition of the modal as well a s support response contributions are compared such as square-root-of - sum-squares, double sum, absolute sum and p-norm methods. The results of this study show that in the case of phase variation of ground motion (uncorrelated support excitations) the double sum or p-norw method with p=1 .8 for the combination of support. and modal response, and in the case of no phase variation of ground motion (correlated support excitations ) the algebraic sum for the combination of support responses and p-norm with p=1.b tor the combination of modal responses give the most accurate results vis-a-vis the exact time history analysis. |
| Year | 1984 |
| Type | Thesis |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Wireland, Martin |
| Examination Committee(s) | Karasudhi, Pisidhi ; Loo, Yew Chaye |
| Scholarship Donor(s) | Carl Duisberg Gesellschaft, Federal Republic of Germany |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1984 |