| 引用本文: | 庞辉,姜涛,戴君武,杨永强,柏文.考虑环境温度效应的隔震橡胶支座力学性能试验[J].哈尔滨工业大学学报,2024,56(6):91.DOI:10.11918/202305083 |
| PANG Hui,JIANG Tao,DAI Junwu,YANG Yongqiang,BAI Wen.Experimental study on mechanical properties of rubber bearings considering the effects of ambient temperature[J].Journal of Harbin Institute of Technology,2024,56(6):91.DOI:10.11918/202305083 |
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| 考虑环境温度效应的隔震橡胶支座力学性能试验 |
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庞辉1,2,3,姜涛1,2,戴君武1,2,杨永强1,2,柏文1,2
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(1.地震工程与工程振动重点实验室(中国地震局工程力学研究所),哈尔滨 150080; 2.地震灾害防治应急管理部重点实验室,哈尔滨 150080;3.北华大学 土木与交通学院,吉林 吉林 132013)
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| 摘要: |
| 为研究环境温度对隔震橡胶支座力学特性的影响,利用高速压剪试验设备针对直径700 mm的隔震橡胶支座（LRB700以及LNR700）开展一系列不同温度（-20、0、23 ℃）、不同频率（0.2、0.25、0.3 Hz）以及不同剪应变（50%、100%、250%）的压剪试验。鉴于高速高压（15 MPa的竖向压应力）试验设备本身会产生较大的惯性力以及摩擦力,分别提供相应的修正方案以便准确获得支座的力学性能指标。结果表明:随着加载圈数的增加,LRB700内部铅芯的温度变化较为明显,并呈现关于高度的对称性,而LNR700内壁温度变化很小;LRB700及LNR700的相关力学性能指标（如水平屈服剪力、屈服后水平刚度以及水平等效刚度）随环境温度的降低都表现出不同程度的上升趋势,其中,LRB700水平屈服剪力上升15%~32%,LRB700屈服后水平刚度上升7%~16%,LRB700与LNR700水平等效刚度分别上升12%~23%、5%~16%。基于上述结果并结合相关规范针对LRB700以及LNR700提出考虑环境温度效应的力学性能调整系数。 |
| 关键词: 隔震橡胶支座 考虑环境温度 修正方案 性能指标 性能调整系数 |
| DOI：10.11918/202305083 |
| 分类号:TU352 |
| 文献标识码:A |
| 基金项目:国家自然科学基金青年基金(52208509)；黑龙江省自然科学基金(LH2022E121)；中国地震局工程力学研究所基本科研业务费专项(2022C04)；国家自然科学基金(52078471)；内蒙古自治区地震局局长基金(2023MS10) |
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| Experimental study on mechanical properties of rubber bearings considering the effects of ambient temperature |
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PANG Hui1,2,3,JIANG Tao1,2,DAI Junwu1,2,YANG Yongqiang1,2,BAI Wen1,2
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（1.Key Laboratory of Earthquake Engineering and Engineering Vibration(Institute of Engineering Mechanics, China Earthquake Administration), Harbin 150080, China; 2.Key Laboratory of Earthquake Disaster Mitigation, Ministry of Emergency Management, Harbin 150080, China; 3.School of Civil Engineering & Transportation, Beihua University, Jilin 132013, Jilin,China）
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| Abstract: |
| To investigate the effect of ambient temperature on the mechanical properties of rubber bearings, high-speed compression shear apparatus is used to conduct a series of compression-shear tests at varying temperatures (-0,0, 23 °C), frequencies (0.2,0.5,0.3 Hz), and shear strains (50%, 100%, 250%) on rubber bearings (LRB700 and LNR700). Given that the significant inertial and frictional forces generated by the high-speed and high-pressure (15 MPa vertial compressive stress) , this paper firstly proposes correction methodologies for accurately determining the performance indexes of bearings under conditions of high-speed and high-pressure loading. Test results indicate that with an increasing number of loading circles, the temperature variation within the internal lead core of LRB700 is more pronounced and exhibits symmetry with respect to the height of the lead core, whereas the temperature variation on the inner wall of LNR700 is minimal. In addition, the primary mechanical indexes of LRB700 and LNR700 (such as characteristic strength, post-yield horizontal stiffness, and horizontal equivalent stiffness) exhibit varying degrees of an upward trend as ambient temperature decreases. Specifically, the characteristic strength of LRB700 increases by 15% to 32%, the post-yield stiffness of LRB700 increases by 7% to 16%, and the horizontal equivalent stiffness of LRB700 and LNR700 increases by 12% to 23% and 5% to 16%, respectively. Finally, this research concludes by proposing mechanical performance adjustment coefficients for LRB700 and LNR700 that account for the effect of ambient temperature based on the aforementioned results and in accordance with relevant standards. |
| Key words: rubber bearings ambient temperature correction methodologies performance index adjustment coefficients |
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