04719nas|a2200421 i 4500 20260818095301.0 010713s2001 th uzm rtt 00| a1eng d .b11829485 AIT Thesis no. ST-01-07 Sopon Ritdumrongkul Effects of multiple support earthquake excitation on dynamic responses of elevated railway structures Bangkok : Asian Institute of Technology, 2001 146 leaves Thesis ; no. ST-01-07 A thesis submitted in partial fulfillment of the-requirements for the degree of Master of Engineering, School of Civil Engineering Thesis (M.Eng.) - Asian Institute of Technology, 2001 Destruction of bridges can be observed in every major earthquake events although these bridges were designed to resist seismic loading. This may be due to neglecting of spatial variability of earthquake in the design of bridges. Therefore, these bridges were designed based on uniform earthquake ground motion. However, in actual situations, bridges, which are large and long structures, are subjected to different ground motion at each support. Non-uniform ground motion, so-called multiple support excitation, can produces quasi-static responses in addition to inertia responses. In conventional seismic resistant design of railway bridges, structures consist of single cell prestressed concrete box girders supported on singlecolumn reinforced concrete piers. Bearing pads and shear keys are installed at the connections between viaduct and piers. Because of the presence of bearing pads and shear keys, eaGh box girder is designed to behave as a hinge-roller beam on the longitudinal direction. Thus, internal forces in conventional design bridges due to the quasi-static force from multiple support excitation may be small because girders are allowed to move freely along the longitudinal axis of bridges. On the other hand,_ one part of Taiwan High-Speed Rail (THSR) bridge will be constructed by using the alternate design system, which box girders are rigidly fixed with alternate piers. The alternate pier consists of an upper portion of twin walls and a lower portion where a stiff wall is added in the longitudinal direction. The two walls are rigidly connected to the viaduct on opposite sides of the expansion joint. By using monolithic connection between viaduct and piers: large quasi-static forces due to multiple support excitation may occur. Due to very contrast characteristics of these two design systems, therefore, effects of multiple support excitation on linear and nonlinear dynamic responses of both conventional and alternate design bridges are studied. Effects of soil-structure interaction, non-uniform pier-height profile of bridges, and imperfection of bridge properties on the responses are also investigated. It is found that multiple support excitation does not create significant d~fferent dynamic responses as compare to uniform excitation for both conventional design and alternate design structures. Soil-structure interaction can increase or decrease internal member forces. Moreover, it significantly affects serviceability and ductility demands. Non-uniform pier-height profile can significantly affect the serviceability. The imperfection has almost no effect on the responses. Finally, it can be concluded response spectrum analysis can be used for estimating the responses for design purpose. Bridges Earthquake effects Earthquake resistant design Pennung Warnitchai, Chairperson Takewaka, Koji, Examination Committee Barry, William Joseph, Examination Committee STARR Foundation, Scholarship Donor Asian Institute of Technology. Thesis ; no. ST-01-07 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B09460 .b11829485 mnait u 240405 0 010713 m a u 0 mnait mnait mnarc 20 40 Barcode : 30050120746630 CREATED : 2000-02-14 RECORD # : i12248721 LPATRON : 1024344 LCHKIN : 2013-10-06 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 4 TOT RENEW : 1 Barcode : 30050120746622 CREATED : 2000-02-14 RECORD # : i12248733 LPATRON : 1023818 LCHKIN : 2012-06-26 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 4 TOT RENEW : 0 Barcode : 30050160067061 CREATED : 2016-04-20 RECORD # : i12940550 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 35240 35240 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no. ST-01-07 30050120746630 2026-08-18 09:53:01 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no. ST-01-07 30050120746622 2026-08-18 09:53:01 2 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no. ST-01-07 30050160067061 2026-08-18 09:53:01 1 2026-08-18 40