高速铁路大跨度梁拱组合桥抗震分析 |
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作者单位: | ;1.中铁第一勘察设计院集团有限公司 |
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摘 要: | 大跨度梁拱组合桥由于竖向刚度较大、梁高较小成为高速铁路常用桥型。为研究梁拱组合桥的地震反应特点,对一(60+128+60)m梁拱组合桥建立动力有限元分析模型,并进行特征值分析,根据其振动模态分析梁拱组合桥的振动特点,并采用时程分析方法对该桥进行弹性和弹塑性地震反应分析。结果表明:该桥在多遇地震下满足截面偏心距要求;在罕遇地震下满足延性率要求;结构满足"小震不坏、大震不倒"的抗震设防目标。
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关 键 词: | 铁路桥 梁拱组合桥 抗震设计 模态分析 弹塑性地震反应 |
Seismic Analysis of Large Span Beam-arch Composite Bridge |
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Affiliation: | ,China Railway First Survey and Design Institute Group Co.,Ltd. |
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Abstract: | Due to its large vertical stiffness and relatively small beam height,large span beam-arch composite bridge is widely applied to high-speed railway. To study the seismic response characteristics of beam-arch composite bridge,a seismic analysis finite element model of a( 60 + 128 + 60) m beam arch composite bridge is established and its vibration characteristics are analyzed according to the modal analysis. Time-history method is employed in the elastic and elastic-plastic analysis of the beam-arch composite bridge. The results indicate that the bridge meets the demands of section eccentricity under low-level earthquake and ductility ratio under high-level earthquake. The bridge structure proves effective in meeting the demand of"no damage under low-level earthquake and no collapse under high-level earthquake". |
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Keywords: | Railway bridge Beam-arch composite bridge Seismic design Modal analysis Elastic-plastic seismic response |
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