| 金水沟特大桥弹塑性抗震分析 |
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| 作者单位： | ;1.中铁第一勘察设计院集团有限公司桥隧处 |
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| 摘 要： | 为了深入了解高墩大跨预应力混凝土刚构连续梁桥在罕遇地震下结构的反应特征,利用Midas/Civil软件,混凝土和钢筋分别采用Mander本构关系和修正梅内戈托与平托本构关系,建立结构的纤维模型,对金水沟特大桥进行罕遇地震下的弹塑性抗震分析。分析结果表明,纤维模型可以有效模拟结构地震下的反应,在罕遇地震下的强度与变形均满足规范,满足"大震不倒"的抗震设防要求,并且还有一定的安全储备;对于金水沟这类高墩大跨刚构连续梁桥,横桥向墩底为控制截面,顺桥向连续梁墩墩底、刚构墩的墩顶与墩底均为控制截面,并且结构顺桥向的地震力较横桥向更为控制结构设计。
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| 关 键 词： | 刚构连续梁桥 纤维模型 罕遇地震 弹塑性抗震分析 本构模型 |
Elastic-plastic Seismic Analysis of Extra-long Jinshuigou Bridge |
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| Institution: | ,Bridge & Tunnel Design Department,China Railway First Survey and Design Institute Group Co. ,Ltd. |
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| Abstract: | In order to understand the respond characteristics of pre-stressed large-span concrete bridge with continuous rigid frame girder and high piers, structural fiber model is established with the application of Midas /Civil software,and Mander constitutive relation and modified Menegotto & Pinto constitutive relation for concrete and reinforcement respectively,to conduct elastic- plastic seismic analysis of the extra- long Jinshuigou Bridge. Results of the analysis show that such micro model can be effectively analog structural seismic reaction and the strength and deformation of the structure under rare earthquake meet the specifications with certain safety reservation. The bottom of pier is dangerous in transverse direction. The top and bottom of the rigid pier and the bottom of the continuous beam pier are all dangerous in longitudinal direction. The earthquake force in longitudinal direction more controls the design of the structure. |
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| Keywords: | Rigid frame continuous bridge Fiber Model Rare Earthquake Elastic-plastic seismic analysis Constitutive model |
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