高速铁路桥墩等效塑性铰长度研究

发布时间：2018-01-04 05:23

本文关键词：高速铁路桥墩等效塑性铰长度研究　出处：《铁道工程学报》2017年07期 　论文类型：期刊论文

【摘要】：研究目的:等效塑性铰长度在墩柱的简化抗震设计中普遍用于预测墩顶的极限水平位移。高速铁路桥墩具有截面尺寸大、纵筋率较低等特点,目前我国铁路抗震设计规范未对桥墩的塑性铰长度给出建议值,设计人员只能参考现有的经验公式进行抗震设计,其适用性还不明确。本文基于9个高速铁路圆端形桥墩拟静力试验数据,对多个桥墩进行塑性铰长度的参数分析,与多种设计规范进行对比,旨在研究并提出适用于高铁桥墩的塑性铰长度公式,以方便桥墩抗震设计。研究结论:(1)利用纤维截面梁柱单元,采用修正Chang-Mander混凝土模型进行分析,与试验曲线吻合良好;(2)桥墩高度和轴压比对塑性铰长度影响较大,钢筋屈服强度与直径对其影响较小;(3)相比于已有的规范公式,本文提出的公式可更为准确地预测高铁桥墩的塑性铰长度;(4)该研究成果可用于高速铁路桥梁的抗震设计与分析。
[Abstract]:Objective: To study the equivalent length of plastic hinge in pier simplified prediction ultimate displacement of pier top commonly used in seismic design. The high-speed railway bridge pier has large section size, lower longitudinal reinforcement ratio, the current code for seismic design of railway in our country is not on the plastic hinge length of the pier to a recommended design staff only for aseismic design of the existing empirical formula, its applicability is not clear. In this paper, 9 high-speed railway round end pier pseudo static test data based on the analysis of the parameters of the plastic hinge length of the pier, compared with a variety of design specifications, the plastic hinge length formula is to research and propose suitable for high-speed railway for the convenience of the pier, pier seismic design. The conclusion of the study: (1) the use of fiber cross section beam column element, using the modified Chang-Mander model of concrete is analyzed, in good agreement with the test curve; (2) the bridge pier height and axial compression ratio A greater impact on the plastic hinge length, steel yield strength and the diameter has little influence on it; (3) compared to the existing standard formula, this formula can more accurately predict the plastic hinge length of high-speed rail pier; (4) seismic design and analysis of the research results can be used for high-speed railway bridges.

【作者单位】：武汉理工大学;中南大学;
【基金】：中国铁路总公司重大课题(2013G002A1) 中央高校基本科研业务费专项资金项目(2017IVA027)
【分类号】：U443.22
【正文快照】： 研究结论:(1)利用纤维截面梁柱单元,采用修正Chang-Mander混凝土模型进行分析,与试验曲线吻合良好;(2)桥墩高度和轴压比对塑性铰长度影响较大,钢筋屈服强度与直径对其影响较小;(3)相比于已有的规范公式,本文提出的公式可更为准确地预测高铁桥墩的塑性铰长度;(4)该研究成果可用

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