研究目的：新建风陵渡黄河特大桥位于八度地震区 ,在跨越黄河主河道时 ,为满足航运和过洪要求 ,其主跨必须采用百米以上大跨度 ,这便对跨主河道的主桥提出了相当高的设计标准。 本文通过有限元程序对主桥结构进行的静力及动力分析 ,介绍了大跨度连续刚构桥延性设计方法 。
研究结论：随着土木工程设计理念的不断更新 ,工程技术人员需要重新审视桥梁结构的防灾减灾设计 ,对大型复杂桥梁进行抗震延性设计是十分必要的 。 本文通过对于高烈度地震区大跨度连续刚构桥在罕遇地震下的抗震分析 ,提供了一种有效的延性设计方法 。 即通过非线性时程分析得到桥墩内力 、位移等反应结果以后 ,将反应结果与各桥墩进行Pushover分析后得到的屈服抗力相比较 ,最终判定全桥是否有足够延性抗震能力 。
Research purposes：New Fenglingdu Bridge Across the Yellow River is located in the eight-degree seismic area. Its main span crossing the mainstream channel of the Yellow River is required to be longer than 100 meters to meet the needs of shipping and flood control, so the higher design standard should be adopted to the main span of the bridge. Through the static and dynamic analyses of the structure of the main span with finite-element program, this paper introduces the ductility design method for large span continuous rigid frame bridges.
Research conclusions：With the renewal of the concept on civil engineering design, the technician should pay more attention to the bridge structure design for disaster prevention and reduction of bridge. It is necessary to make the ductility design for earthquake resistance to complicated bridges. Through seismic analysis of large span continuous rigid frame bridge in intense earthquake area under rarely strong earthquake, this paper offers an effective ductility design method. Namely, using non-linear temporal analysis method gains the force and displacement of the piers, and comparing the response results with the yield-resistant capacity of each pier gained through Pushover analysis determines whether the bridge has enough ductile earthquake-resistant capacity or not.
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