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New Design and Analysis Procedures for Intermediate Hinges in Multiple-Frame Bridges; Final rept. 1995-98
| 题名： | New Design and Analysis Procedures for Intermediate Hinges in Multiple-Frame Bridges; Final rept. 1995-98 |
| 作者： | DesRoches, R.; Fenves, G. L. |
| 关键词： | Bridges(Structures); Expansion joints; Earthquake engineering; Slamming; Vibration damping; Displacement; Constraining; Hinges; Frames; Seismic design |
| 摘要： | During an earthquake adjacent bridge frames can vibrate out-of-phase exceeding the range of support provided by the hinge seat, leading to collapse. the collapse of bridges in recent earthquakes due to hinge unseating emphasized the importance of providing an adequate number of hinge restrainers to limit the relative displacement between hinges. Current restrainer design procedures do not account for controlling factors in the response of multiple-frame bridges. Multiple-step and single-step restrainer design procedures based on a linearized numerical model are developed. Parameter studies show that the procedures work well in limiting the relative hinge displacement to a target displacement for a wide range of parameters. The required number of restrainers decreases as the frame period ratio increases and as the frame ductility increases. The new procedures are recommended except for cases with highly out-of-phase frames and large skew (greater than 30 degrees). For these cases, a nonlinear analysis may be needed to adequately capture the response. Recommendations are made for hinge seat widths for new bridges. The recommendations are based on a modal analysis of the frames adjacent to the hinge. The recommended hinge seat width correlates well with nonlinear time history analysis. |
| 总页数： | 234p |
| 报告类型： | 科技报告 |
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