A modal pushover analysis on multi-span concrete bridges to estimate inelastic seimic responses | |
| Author | Muljati, Ima |
| Call Number | AIT Thesis no.ST-04-09 |
| Subject(s) | Modal analysis Bridges, Concrete--Earthquake effects |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ST-04-09 |
| Abstract | The objective of this study is to investigate the performance of modal pushover analysis on multi-span concrete bridge. The bridge is subjected to lateral forces distributed proportionally over the span of the bridge according to sn*, the product of mass and displaced shape. The bridge is pushed up to the target displacement determined from the peak displacement of the nth mode elastic SDF system. For inelastic bridge, the base shear-pier’s top displacement curve is developed from pushover analysis for each mode. This pushover curve is idealized as bilinear and converted to the force-deformation relation for the nth mode inelastic SDF system. The peak displacement of this SDF system is used to determine the target displacement for pushover analysis. The peak modal response is obtained by modal combination rule such as square-root of sum-of-square. Finally, the peak modal response approximated by MP A is compared to the rigorous nonlinear time history analysis (NLTHA). Although the use of square-root of sum-of-square is not appropriate in this bridge, because the natural frequencies of the bridge is not well separated, MP A can predict well the peak response of the bridge in both elastic and inelastic range. Noticed for inelastic bridge, the displaced pattern is shifted from the elastic shape due to yielding. However, this study does not identify the effect of this shift to the performance of MP A in predicting the peak response. |
| Year | 2004 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-04-09 |
| 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) | Pennung Warnitchai;Lumantarna, Benjamin; |
| Examination Committee(s) | Pichai Nimityongskul; |
| Scholarship Donor(s) | Petra ;AIT Fellowship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2004 |