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Design of Highway Bridges for Extreme Events.
| 题名： | Design of Highway Bridges for Extreme Events. |
| 关键词： | *Bridges-; *Design-specifications; *Live-loads; *Wind-loads.;Earthquakes-; Ship-collisions; Scour-; Reliability-model. |
| 摘要： | The Design of Highway Bridges for Extreme Events is a design procedure for the application of extreme load events and the combination of their load effects in the AASHTO LRFD Bridge Design Specifications (1998). This is achieved by proposing a set of load factors calibrated using a reliability based procedure that is consistent with the reliability methodology of the AASHTO LRFD specifications. The load events considered in this study include live loads, earthquakes, wind loads, ship collision loads, and scour. The reliability analysis of the effects of each load taken individually is performed using methods developed in previous bridge code calibration efforts (for the live loads and ship collision) and during the development of other structural codes (for wind loads and earthquake loads). The current specifications for scour were not based on reliability methods; a scour reliability model has been developed for the purposes of this study. In addition, the Ferry-Borges model is used to evaluate the reliability of bridges under the combined effects of extreme load events. Results from the reliability of typical bridge configurations under the effects of individual threats are used to define target reliability levels for the development of load factors applicable for designing bridges that may be susceptible to a combination of threats. The objective is to recommend a rational and consistent set of load combination factors that can be implemented in future versions of the AASHTO LRFD specifications. |
| 报告类型： | 科技报告 |
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