| 采用SMA拉索的摇摆自复位桥墩试验研究与动力分析 |
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| 引用本文： | 张哲熹,梁栋,方成,郑越.采用SMA拉索的摇摆自复位桥墩试验研究与动力分析[J].世界地震工程,2020,0(4):138-146. |
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| 作者姓名： | 张哲熹 梁栋 方成 郑越 |
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| 作者单位： | 同济大学 建筑工程系,上海 200092;同济大学 土木工程防灾国家重点实验室,上海 200092;同济大学 建筑工程系,上海 200092 |
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| 基金项目： | 国家自然科学基金;国家自然科学基金 |
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| 摘 要： | 为了提升桥梁结构的抗震韧性，提出了一种采用超弹性形状记忆合金（SMA）拉索的摇摆自复位桥墩。首先对单根SMA拉索进行变幅循环拉伸试验，随后以SMA拉索的预张拉应力为试验参数，针对新型桥墩开展缩尺模型试验，详细考察了试件的力学行为与损伤模式，讨论了桥墩的滞回曲线和复位能力；提出了新型桥墩的初步设计建议，并利用OpenSees进行非线性时程分析验证。研究表明:得益于摇摆机制以及SMA拉索良好的可恢复变形性能，桥墩试件在4%滑移率内几乎不产生损伤；与传统梁桥相比，采用SMA拉索桥墩的新型梁桥可有效降低结构残余变形以及桥墩本身的损伤。虽然最大变形有所放大，但仍处在可控范围。
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| 关 键 词： | 摇摆桥墩 自复位 形状记忆合金 抗震韧性 非线性时程分析 |
Experimental study and dynamic analysis on self-centering rocking piers equipped with shape memory alloy (SMA) cables |
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| ZHANG Zhexi,LIANG Dong,FANG Cheng,' target="_blank" rel="external">,ZHENG Yue,' target="_blank" rel="external">.Experimental study and dynamic analysis on self-centering rocking piers equipped with shape memory alloy (SMA) cables[J].World Information On Earthquake Engineering,2020,0(4):138-146. |
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| Authors: | ZHANG Zhexi LIANG Dong FANG Cheng " target="_blank">' target="_blank" rel="external"> ZHENG Yue " target="_blank">' target="_blank" rel="external"> |
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| Institution: | 1. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China;2. College of Civil Engineering, Tongji University, Shanghai 200092, China |
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| Abstract: | To enhance the seismic resilience of bridge structures, this paper presents a new SMA-cable-based self-centering rocking pier (SMA-SCR pier). The study commences with cyclic tests on individual SMA cables. Subsequently, preliminary tests on proof-of-concept SMA-SCR pier specimens are conducted, with the cable prestress considered as the varying parameter. The behavior and damage pattern of the specimen are examined, and the hysteretic responses and self-centering capability are discussed. Some preliminary design recommendations for the new piers are proposed, and a nonlinear dynamic analysis is then conducted to verify the feasibility of the pier. It is indicated from the study that the pier specimen shows almost no damage under 4% drift, thanks to the allowed rocking mechanism and the good recoverability of the SMA cables. Compared with the conventional bridge, the residual deformation and pier damage of the new bridge are effectively mitigated. While the maximum deformation is amplified, the value is still within the controllable range. |
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| Keywords: | rocking pier self-centering Shape Memory Alloy seismic resilience nonlinear time history analysis |
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