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橡胶垫隔震框架结构试验研究 总被引：5，自引：0，他引：5
橡胶垫隔震是房屋结构减震的一种有效新途径。本文通过橡胶垫力学性能试验结果的分析，说明了橡胶垫适合多层房屋基础隔震的要求。计算机分析结果表明，橡胶垫隔震框架房屋的地震反应比固定基础房屋的反应大大减小。 相似文献
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对小型叠层橡胶支座（Ｄ〈１００ｍｍ）进行了压剪试验研究,总结了这类支座的一些基本性能。试验表明,当用现有的大型叠层橡胶支座水平刚度公式计算小型叠层橡胶支座的水平刚度时,结果偏小,必须进行适当修正。本文还对一组锡芯叠层橡胶支座进行了试验研究,并得到了一些初步结果。 相似文献
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采用数值模拟方法,研究了叠层橡胶支座的水平极限承载能力随支座端部约束状态和竖向面压变化的规律,其结果可供叠橡胶支座型基础隔震结构设计参考。 相似文献
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本文采用商用标准件叠层压电驱动器和圆形摩擦盘,研发了能提供水平任一方向可调摩擦阻尼力的新型压电变摩擦阻尼器,能与圆形隔震垫协同工作复合而成智能隔震系统.文中首先提出了新型压电阻尼器的基本结构,制作了试验室比例的模型;其次针对压电驱动器变形在微米数量级的特点和约束钢架的刚度特性,提出了基于有限元分析的形状系数和可调正压力计算方法.并用约束钢架变形试验验证了有限元分析的正确性;最后通过阻尼器性能试验提出了连续型的阻尼力计算模型,一种适合于实际工程应用的摩擦阻尼力模型.提出的新型压电摩擦阻尼器构造简单,阻尼力调节方便,响应速度快,特别是便于进一步增大阻尼力调节倍数,能够较大地推动压电阻尼器实用化进程. 相似文献
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就橡胶垫隔震体系和摩擦摆隔震体系,研究分析大型立式储液罐在不同场地实际地震作用下的响应,同时将地震响应与非隔震储罐进行对比分析。分析结果表明:在柔软场地,摩擦摆隔震系统的减震效果要好于橡胶垫系统。摩擦摆支座控制隔震层位移的能力要好于橡胶垫支座。此外,进行了参数影响分析,来衡量储罐储液量、高径比和隔震系统的隔震周期对储罐主要响应的影响。储罐储液量较小时,摩擦摆支座的减震率要好于橡胶垫支座。隔震储罐高径比不宜取为0.8,此时脉冲位移和基底剪力的峰值响应都较大。隔震周期在2 s～3 s区间范围内时,可以取得最优减震效果。 相似文献
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SMA绞线-叠层橡胶复合支座振动台试验研究 总被引：2，自引：1，他引：1
对一组SMA绞线-叠层橡胶复合支座进行了振动台试验。根据试验结果比较分析了SMA绞线-叠层橡胶复合支座与普通叠层橡胶支座的隔震性能,着重分析了位移幅值对支座工作性能基本参数如等效水平刚度、最大恢复力、单位循环耗能和等效阻尼比的影响以及这些参数的变化规律。从而证明了在罕遇地震作用下发生较大水平位移幅值时,SMA绞线-叠层橡胶复合支座比普通叠层橡胶支座可提供更大的恢复力和阻尼,更有利于阻隔地震对上部结构的作用和强震作用后上部结构的自动复位。 相似文献
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本文充分考虑了实际工程应用中的诸多因素,成功地研制了40吨足尺变刚度控制系统并对其进行了性能试验,实现了模型试验到实用样机的转化,性能试验结果表明,该足系统的性能满足各项设计技术要求,系统滞回曲线说明系统充分发挥了可变刚度的吸能,释能减振控制作用,在此基础上,文中研究了足尺系统的设计与控制算法,试验工况与试验结果以及计算模型。 相似文献
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砌体结构工程抗震软件的结构隔震功能及算例分析 总被引：1，自引：0，他引：1
在砌体结构抗震软件开发过程中，为完善软件功能，添加了结构减震设计验算程序。作为首次应用性软件开发，暂只包含橡胶热隔震的设计与验算功能。本文主要介绍了软件应用时，橡胶垫隔震支座的设计过程，并通过对一个模拟的8层砌体建筑进行隔震设计与对比分析，给出了隔震设计后隔震效果的有关结论。 相似文献
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This paper describes the results of shaking table tests to ascertain the ultimate behavior of slender base‐isolated buildings and proposes a time history response analysis method, which can predict the ultimate behavior of base‐isolated buildings caused by buckling fracture in laminated rubber bearings. In the tests, a base‐isolated structure model weighing 192 kN supported by four lead rubber bearings is used. The experimental parameters are the aspect ratio of height‐to‐distance between the bearings and the shape of and the axial stress on the bearings. The test results indicate that the motion types of the superstructure at large input levels can be classified into three types: the sinking type; the uplift type; and the mixed type. These behaviors depend on the relationship between the static ultimate lateral uplifting force on the superstructure and the lateral restoring characteristics of the base‐isolated story. In the analysis method, bearing characteristics are represented by a macroscopic mechanical model that is expanded by adding an axial spring to an existing model. Nonlinear spring characteristics are used for its rotational, shear, and axial spring. The central difference method is applied to solve the equation of motion. To verify the validity of the method, simulation analysis of the shaking table tests are carried out. The results of the analysis agree well with the test results. The proposed model can express the buckling behavior of bearings in the large deformation range. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
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In this study, aging and marine corrosion tests of a large number of rubber material and rubber bearings have been carried out. The constitutive Mooney-Rivlin model parameters for a rubber isolated bearing have been determined. By applying the least-square method to the experimental data, the relationships between the aging time and the marine corrosion time with the constants in the constitutive model for a rubber bearing have been derived. Next, the Mooney-Rivlin model has been modified accordingly. Further, using the modified Mooney-Rivlin model and the Abaqus software, the performance of the rubber isolated bearings has been simulated. The simulation results have been compared to the experimental results so as to verify the accuracy of the modified model. The comparison shows that the maximum errors for the vertical and horizontal stiffnesses are 16.8% and 0.49%, respectively. Since these errors are considered acceptable, the accuracy of the modified constitutive model can be considered verified. The results of this study can provide theoretical support for the performance study on rubber isolated bearings under the complex ocean environment and the life-cycle performance evaluation of bridges and other offshore structures. 相似文献
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Comparison of fundamental properties of new types of fiber‐mesh‐reinforced seismic isolators with conventional isolators 
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下载免费PDF全文 New types of fiber‐reinforced rubber‐based seismic isolators have been a research interest for a number of engineers in the past decade. These new types of isolators can have similar seismic performances compared with the conventional ones. In most of the previous researches, the fiber‐reinforced rubber‐based isolators is usually manufactured with placing fiber sheets between precut rubber layers with the use of a bonding agent. This research differs from the previous researches in terms of manufacturing process, use of fiber mesh instead of fiber sheets, and use of lead in the core for some of the bearings. The aim of this research is to provide comparisons in fundamental seismic response properties of the new type of fiber mesh reinforced isolators and conventional isolators. In this scope, four pairs of fiber mesh reinforced elastomeric bearings and four pairs of steel‐reinforced elastomeric bearings are subjected to various levels of compression stresses and cyclic shear strains under constant vertical pressure. The tested types of isolators are fiber mesh reinforced elastomeric bearing, fiber mesh reinforced elastomeric bearing with lead core, steel‐reinforced elastomeric bearings, and steel‐reinforced elastomeric bearings with lead core. In this research, steel‐reinforced bearings are called conventional isolators. The major advantage for fiber mesh reinforced bearings observed during the tests is that these isolators can develop a considerable low horizontal stiffness compared with the conventional isolators. The damping characteristics of the new and conventional types are similar to each other. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
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为评估隔震和非隔震支座对桥梁地震易损性的影响,以一座3跨连续混凝土箱梁桥为分析对象,首先建立采用铅芯橡胶隔震支座与非隔震型盆式橡胶支座下桥梁的数值模型,求得不同程度地震作用下墩顶与支座的最大位移响应;再定义转角延性比损伤指标,结合支座剪应变,分析桥墩和支座的地震易损性情况;最后通过宽界限法建立全桥地震易损性曲线。研究结果表明,支座是较容易发生损坏的构件,而桥梁系统比桥墩或支座更易发生破坏,同时铅芯橡胶支座的破坏概率明显低于非隔震型盆式支座,可见采用隔震支座能有效减小桥墩墩顶在地震作用下的最大位移,此时桥墩地震易损性优于采用非隔震支座的情况。 相似文献
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While isolation can provide significantly enhanced performance compared to fixed‐base counter parts in design level or even maximum considered level earthquakes, there is still uncertainty over the performance of isolation systems in extreme events. Researchers have looked at component level stability of rubber bearings and on the effect of moat impact on behavior of structures isolated on general bilinear isolators. However, testing of triple friction pendulum (TFP) sliding bearings has not been done dynamically or incorporated into a building system. Here, one‐third scale laboratory tests were conducted to on a 2‐story 2‐bay TFP‐isolated structure. Input motions were increasingly scaled until failure occurred at the isolation level. As the superstructure was designed with a yield force equivalent to the force of the bearing just at their ultimate displacement capacity, there was minimal yielding. A numerical model is presented to simulate the isolated building up to and including bearing failure. Forces transferred to the superstructure in extreme motions are examined using both experimental and numerical data. Additionally, the effect of the hardening stage of the TFP bearing is evaluated using the numerical model, finding slight benefits. 相似文献
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采用有限元模拟的方式,对板式橡胶支座摩擦滑移特性进行分析,并与常温试验中获得的支座摩擦滑移滞回曲线、等效黏滞阻尼比等进行了对比。在获得可靠模型的基础上,分析环境温度对板式橡胶支座摩擦滑移特性的影响,研究了温度与支座摩擦滑移耗能、等效黏滞阻尼比和滑动起始距离的关系。结果表明:(1)板式橡胶支座的有限元模型可以较好地实现支座在水平荷载作用下的摩擦滑移特性;(2)在±25℃温度范围内,温度越低,板式橡胶支座在摩擦滑移过程中耗能越多,最大相差37.5%。在寒冷地区,支座将更早的进入滑移状态,对采用板式橡胶支座的桥梁更应注意控制桥梁上部结构的支承长度;(3)板式橡胶支座的黏滞阻尼比随着形状系数的减小而增大,而支座的起始滑移距离则随之减小。 相似文献
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Investigation of the seismic response of high‐rise buildings supported on tension‐resistant elastomeric isolation bearings 下载免费PDF全文
下载免费PDF全文 In many applications of seismic isolation, such as in high‐rise construction, lightweight construction, and structures with large height‐to‐width aspect ratios, significant tension forces can develop in bearings, raising concerns about the possible rupture of elastomeric bearings and the uplift of sliding bearings. In this paper, a novel tension‐resistant lead plug rubber bearing (TLRB) with improved tension‐resisting capabilities is developed and experimentally and numerically assessed. This TLRB consists of a common lead plug rubber bearing (LRB) and several helical springs. After describing the theory underlying the behavior of the TLRB, the mechanical properties of reduced‐scale prototype bearings are investigated through extensive horizontal and vertical loading tests. The test results indicate that TLRBs can improve the shear stiffness and tension resistance capacity even under significant tensile loads. A series of shaking table tests on scaled models of high‐rise buildings with different aspect ratios were conducted to investigate the dynamic performance of the TLRB and the seismic responses of base‐isolated high‐rise buildings. Three different cases were considered in the shaking table tests: a fixed base condition and the use of TLRB and LRB isolation systems. The results of the shaking table test show that (a) base‐isolated systems are effective in reducing the structural responses of high‐rise buildings; (b) an isolated structure's aspect ratio is an important factor influencing its dynamic response; (c) TLRBs can endure large tensile stresses and avoid rupture on rubber bearings under strong earthquakes; and (d) the experimental and numerical results of the responses of the models show good agreement. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
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低硬度橡胶隔震支座各种相关性及老化徐变特性 总被引：4，自引：1，他引：4
作者系统地对低硬度橡胶隔震支座的材料和力学性能进行了试验研究。研究使用的低硬度橡胶隔震支座分18种规格，总计近30个大直径隔震支座。研究内容涉及低硬度橡胶隔震支座的基本力学性能；温度、压力、剪切变形、老化和徐变等相关性；压缩界限，屈曲及极限剪切变形等界限性能以及橡胶材料性能和隔震工程应用等方面。本文主要介绍低硬度橡胶隔震支座的压力、剪切变形、温度对支座刚度、阻尼等力学性能的影响，同时还对隔震支座的老化及徐变特性进行了试验研究，确定低硬度橡胶使用60年后的力学性能变化率。文中同时提出了低硬度橡胶支座的温度修正方程，并提出了隔震结构地震反应分析时支座刚度和屈服荷载变化的取值范围。 相似文献
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本研究系统地对低硬度橡胶隔震支座的材料及力学性能进行了试验研究。研究用低硬度橡胶天然及铅芯橡胶隔震支座18种规格总计近30个大直径隔震支座。研究内容涉及低硬度橡胶隔震支座的基本力学性能，温度、压力、剪切变形、老化及徐变等相关性能，压缩界限、拉伸界限、极限剪切变形等界限性能和屈曲特性，以及橡胶材料性能和隔震工程应用等方面。本文主要介绍低硬度橡胶天然及铅芯隔震支座的压缩、拉伸、剪切等界限性能和屈曲应力与剪切应变的相关特性，文中提出了基于刚度因子建立的橡胶支座的界限压缩和界限拉伸应力评价方程，同时还给出了剪切变形状态下的屈曲应力评价方法。 相似文献
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Elastomeric isolation bearings consist of multiple rubber layers with their top and bottom surfaces bonded to steel plates to restrict compressive deformation. Deformation constraints result in a variation of elastic modulus over the cross section of the rubber layers. In this paper, we describe a normalized compression modulus distribution on a circular rubber pad. The compressive and bending moduli of the rubber pad can be reproduced by applying the distribution to a series of axial springs. We also present a mechanical model for predicting the behavior of elastomeric seismic isolation bearings subject to large shear deformation and high compressive load. The mechanical model consists of a series of multiple shear springs at midheight and a series of axial springs at the top and bottom interfaces of the bearing. Simulation analyses of bearing tests were conducted to validate the proposed model. The analyses demonstrated that a model for circular lead-rubber bearings can successfully capture the influence of the axial load magnitude on the bearing shear behavior. The new model can simulate much more realistic behavior than prior models based on a uniform modulus assumption. 相似文献