Shaking Table Model Test for Dynamic Response of Modular Panel Geosynthetic Reinforced Soil Abutments
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摘要: 模块式面板土工合成加筋土(Geosynthetic Reinforced Soil，GRS)桥台因其施工简单、造价经济、维护成本低和环保等优点而得到广泛应用.基于半比例尺大型振动台模型试验，研究了地震作用下模块式GRS桥台的动力响应，得到了桥台墙面板水平位移、顶部沉降、固有频率和阻尼比变化规律以及加速度放大分布规律.研究结果表明：墙面板位移值均随峰值加速度的增加逐渐增大，最大位移发生在顶部，墙面板的位移模式以转动为主；输入0.4g WL波时，桥座后方加筋区与非加筋区的沉降达到峰值，分别为2.03mm和5.24mm，小于FHWA规范中1%H的沉降要求；模型在不同振动阶段的固有频率在14.31~14.83Hz，阻尼比整体呈降低趋势；根据实测结果提出了适合模块式GRS桥台的加速度放大系数分布公式.Abstract: Modular panel Geosynthetic Reinforced Soil (GRS) abutments has been widely used due to its advantages of simple construction,economic benefit,low maintenance cost and environmental protection.Based on the half-scale large shaking table model tests,the dynamic response of modular GRS abutment under earthquake action was studied.The changes of horizontal displacement,top settlement,natural frequency and damping ratio and the distribution of acceleration amplification were obtained.The results show that the displacement value of the wall panel increases gradually with the increase of peak acceleration,and the maximum displacement occurs at the top of the wall panel.The displacement mode of the wall panel is mainly rotation.When the bridge was input to 0.4g WL wave,the settlement value of the reinforced area and the non-reinforced area reaches the peak,2.03mm and 5.24mm respectively,which are less than the 1%H settlement requirement in FHWA specification;the natural frequency of the model in different vibration stages ranges from 14.31Hz to 14.83Hz,and the damping ratio decreases overall.According to the measured results,the acceleration amplification coefficient distribution formula for modular GRS abutment was proposed.
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