| 考虑尺寸效应的近海桥梁天然橡胶隔震支座力学性能老化时变规律研究 |
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| 引用本文： | 李艳敏,马玉宏,赵桂峰.考虑尺寸效应的近海桥梁天然橡胶隔震支座力学性能老化时变规律研究[J].世界地震工程,2020,0(4):169-177. |
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| 作者姓名： | 李艳敏 马玉宏 赵桂峰 |
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| 作者单位： | 广州大学 工程抗震研究中心,广东 广州 510405;广东省地震工程与应用技术重点实验室,工程抗震减震与结构安全教育部重点实验室,广东 广州 510405;广东省地震工程与应用技术重点实验室,工程抗震减震与结构安全教育部重点实验室,广东 广州 510405;广州大学 土木工程学院,广东 广州 510006 |
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| 基金项目： | 国家自然科学基金;国家自然科学基金;国家自然科学基金;创新项目 |
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| 摘 要： | 目前天然橡胶支座（NRB）的性能研究大多未考虑尺寸效应，在前期开展的近海桥梁隔震支座和材料老化时变规律研究的基础上，同时考虑支座直径尺寸变化和老化作用时间的影响对NRB的性能进行研究。首先采用ABAQUS有限元软件对不同直径尺寸NRB的性能进行分析，得到了NRB性能随直径尺寸的变化规律；然后结合前期老化作用对NRB及其橡胶材料性能时变规律的影响研究成果，分析了直径尺寸及老化作用时间共同作用下，NRB性能的变化规律，并通过ABAQUS有限元分析，验证了该变化规律的准确性。结果表明:NRB的水平刚度和竖向刚度均随其直径尺寸的增大呈正比例增大趋势；NRB水平刚度比和竖向刚度比均随老化作用时间的增长呈线性增大趋势；且直径为150mm的NRB在实际环境老化60a后，其水平刚度和竖向刚度的增长幅度分别为:30.8%和16.41%，由此可见老化作用时间对NRB水平刚度的影响较显著，对其竖向刚度的影响较小。研究内容可为隔震桥梁结构中支座缩尺模型试验的相关设计提供参考，并为将实验室缩尺橡胶隔震支座的相关成果较好地应用于实际工程计算及设计中提供依据。
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| 关 键 词： | 直径尺寸 老化时间 近海桥梁 天然橡胶隔震支座 水平刚度 竖向刚度 时变规律 有限元分析 |
Study on the time-varying law of mechanical properties for natural rubber bearing used in offshore bridge considering the diameter size effect |
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| LI Yanmin,' target="_blank" rel="external">,MA Yuhong,' target="_blank" rel="external">,ZHAO Guifeng,' target="_blank" rel="external">.Study on the time-varying law of mechanical properties for natural rubber bearing used in offshore bridge considering the diameter size effect[J].World Information On Earthquake Engineering,2020,0(4):169-177. |
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| Authors: | LI Yanmin " target="_blank">' target="_blank" rel="external"> MA Yuhong " target="_blank">' target="_blank" rel="external"> ZHAO Guifeng " target="_blank">' target="_blank" rel="external"> |
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| Affiliation: | 1. Earthquake Engineering Research & Test Center, Guangzhou University, Guangzhou 510405, China;2. Guangdong Provincial Key Laboratory of Earthquake Engineering and Applied Technology, Key Laboratory of Earthquake Resistance, Earthquake Mitigation and Structural Safety, Ministry of Education, Guangzhou 510405, China;3. School of Civil Engineering, Guangzhou University, Guangzhou 510006, China |
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| Abstract: | Now, most of the studies for natural rubber bearing’s (NRB) performance do not consider the size effect. Given our previous research on the time-varying law of NRB and its rubber material used in offshore bridges, the NRB’s performance was studied considering both the diameter size of NRB and the aging time in this study. Firstly, ABAQUS was used to analyze the performance of NRB with different diameters to find the change law of NRB’s performance with diameter size under the condition that the thickness of rubber layers and inner steel plates varies proportionally with the diameter size but the number of laminated layers and the shape coefficient remain unchanged. Then, the change trend of the NRB’s performance considering the effect of diameter size and aging time was studied, combined with the research results mentioned above. Finally, the horizontal and vertical stiffness of NRB under the influence of both diameter size and aging time, were simulated and the simulation results were compared with the calculation results to verify the accuracy of the proposed change law of NRB performance under the effect of diameter size and aging time. Results show that diameter size has a significant effect on both the horizontal and vertical stiffness of NRB. The aging time also has a significant effect on the horizontal stiffness but has little effect on the vertical stiffness. This research can offer a reference for the design of the scale model test of isolated bridge structure and also can provide information for the application of the relevant study results of the small-size rubber bearing in design and calculation of practical engineering. |
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| Keywords: | diameter size aging time offshore bridge natural rubber bearing horizontal stiffness vertical stiffness time-varying law finite element analysis |
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