地震作用下多层桥梁结构弹塑性分析  

Elastoplastic Analysis of Multi-storey Bridge Structures under Earthquake Action

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作  者:张玥[1] 薛磊 杨宝刚 周敉[2] ZHANG Yue;XUE Lei;YANG Baogang;ZHOU Mi(School of Architecture and Civil Engineering,Xi′an University of Science and Technology,Xi′an,China,710054;Key Laboratory for Bridge and Tunnel Engineering of Shaanxi,Chang′an University,Xi′an,China,710054)

机构地区:[1]西安科技大学建筑与土木工程学院,陕西西安710054 [2]长安大学桥梁与隧道陕西省重点实验室,陕西西安710054

出  处:《沈阳建筑大学学报(自然科学版)》2021年第1期104-112,共9页Journal of Shenyang Jianzhu University:Natural Science

基  金:国家自然科学基金项目(51978062);长安大学中央高校基本科研业务费专项基金项目(300102210513);陕西省创新人才推进计划-科技创新团队(2018-TD-040)。

摘  要:目的研究地震作用下双层及三层桥梁结构塑性铰的产生机制,明确多层桥梁桥墩的出铰位置及出铰顺序。方法以某双层三跨及三层三跨钢筋混凝土箱型简支桥梁为背景,基于Sap2000中的桥梁模块建立非线性的有限元模型,采用增量动力的分析方法,绘制双层及三层桥梁结构的IDA曲线,分析地震作用下双层及三层桥梁结构塑性铰的出现位置及顺序。结果结果表明:对于双层桥梁结构,塑性铰可能出现在底层桥的墩底和墩顶、顶层桥的墩顶位置;对于三层桥梁结构,塑性铰可能出现在底层桥的墩顶和墩底、中间层桥的墩顶、顶层桥的墩顶位置;两种结构均是底层桥墩底的塑性铰先出现。结论对于多层桥梁结构,底层桥的墩底以及各层的墩顶会出现塑性铰,其余各层的墩底不出现塑性铰。The purpose of this study is to study the generation mechanism of plastic hinge in double and three-layer bridges under earthquake action,making clear the hinge position and hinge sequence of the pier of multi-layer bridge.Taking a double-layer and three-layer reinforced concrete box simply supported bridge as the background.Based on the CSiBridge,a nonlinear finite element model was established.Incremental dynamic analysis method was adopted to draw IDA curves of double-layer and three-layer bridge structures and analyze the occurrence position and sequence of plastic hinges of double-layer and three-layer bridge structures under earthquake action.The results show that:for the double-layer bridge structure,plastic hinge may appear at the bottom and top of the pier of the bottom bridge and the top of the top bridge.For the three-layer bridge structure,plastic hinge may appear on the pier top and bottom of the bottom bridge,the pier top of the middle bridge,and the pier top of the top bridge.The bottom plastic hinge appears first in both structures.For multi-layer bridge structures,plastic hinge will appear at the bottom of the bottom bridge and at the top of each layer,while no plastic hinge will appear at the bottom of the other layer.

关 键 词:双层及三层桥梁结构 塑性铰 增量动力分析 墩底 

分 类 号:TU997[建筑科学—市政工程] U442.55[建筑科学—桥梁与隧道工程]

 

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