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Behavior and Failure Analysis of a
Multiple-Frame Highway Bridge in the
1994 Northridge Earthquake
| 题名： | Behavior and Failure Analysis of a Multiple-Frame Highway Bridge in the 1994 Northridge Earthquake |
| 作者： | Gregory L. Fenves Michael Ellery |
| 关键词： | Seismic, Seismic Analysis, Bridge, Reinforced Concrete |
| 摘要： | The Route 14/Interstate 5 Separation and Overhead bridge, a curved ten-span concrete structure, partially collapsed In the 1994 Northridge earthquake. This study examined the cause of failure by comparing estimates of the capacities and demands of components in the bridge. Nonlinear static analysis (pushover analysis) is used to determine the capacity of a frame. Nonlinear dynamic analysis results are used to evaluate the earthquake response. The demand-capacity comparison shows that shear failure of piers 2 and 3 in a brittle-ductile mode was the likely cause of the collapse. The bending moment in the box girder over pier 3 nearly reached the flexural capacity or had started to yield at the time piers 2 and 3 reached their shear capacity. The displacement at Intermediate hinge 4 was much less than the hinge seat width; it is unlikely that hinge unseating precipitated the failure. The three-dimensional model of the bridge was used to investigate the behavior of the bridge if it had been seismlcally retrofit prior to the earthquake. If the bridge had been retrofit, the analysis shows it would have experienced minor to moderate damage in plastic hinge zones of several piers. The analyses indicate the bridge would have been functional (able to carry emergency traffic) after the earthquake. The displacements from the nonlinear model are compared with linear models typically used in seismic design. The linear compression provides a good estimate of the displacement demands. |
| 报告类型： | 科技报告 |
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