砂垫层隔震村镇建筑抗震性能振动台试验研究

徐文杰,袁康,李英民,苟欣

振动与冲击 ›› 2021, Vol. 40 ›› Issue (18) : 132-139.

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PDF(1797 KB)
振动与冲击 ›› 2021, Vol. 40 ›› Issue (18) : 132-139.
论文

砂垫层隔震村镇建筑抗震性能振动台试验研究

  • 徐文杰1,袁康1,2,李英民3,苟欣3
作者信息 +

Shaking table tests on the seismic performances of rural buildings with isolated sand cushion

  • XU Wenjie1,YUAN Kang1,2,LI Yingmin3,GOU Xin3
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摘要

砂垫层隔震技术因其在隔震同时可消除地基冻胀影响而适用于中国北方高地震烈度区的农村低层建筑。为研究砂垫层隔震结构的抗震性能,制作了普通抗震结构和砂垫层隔震结构2个两层砌体房屋的1/4缩尺模型,对其进行了振动台试验,对比研究了在不同地震动输入强度下2种结构的动力特性演变规律和动力响应特征。研究结果表明:普通抗震模型在7.0度罕遇地震时发生底层集中塑性变形的剪切破坏;砂垫层隔震模型依靠砂垫层的塑性变形发挥隔震作用,直至8.5度罕遇地震时模型发生剪切型破坏。从加载初期(6.0度设防地震)到普通抗震模型临近退出工作期间(7.5度设防地震)来看,砂垫层隔震模型在X向和Y向的自振频率下降量较普通抗震模型小,动力放大系数和层间位移均明显更小,与试验现象表现出的结构几乎没有损伤一致,表明砂垫层能够有效降低上部结构地震输入,具有良好隔震效果。

Abstract

Sand cushion isolation technology is suitable for rural low-rise buildings in high seismic intensity areas of northern China because it can eliminate the influence of foundation frost heaving besides the effect of seismic isolation.In order to investigate the seismic performances of sand cushion isolation structures, two 1/4 scale models of a two-story masonry building were made, the one is the ordinary aseismic structure and the other is the sand cushion isolation structure.The evolution of dynamic characteristics and dynamic responses of the two structures were compared and studied under different ground motion input intensities by shaking table tests.The results show that the shear failure due to concentrated plastic deformation of the bottom layer of the ordinary aseismic model happens under 7.0 degrees rare earthquake.As to the sand cushion isolation model, taking advantage of the isolation effect of the plastic deformation of sand cushion, the shear failure happens until the arrival of 8.5 degrees rare earthquake.From the initial stage of loading (6.0 degrees moderate earthquake) to the period when the ordinary aseismic model was going to quit work (7.5 degrees moderate earthquake), the decrease of natural frequencies of the sand cushion isolation model in X and Y axes are smaller than that of the ordinary aseismic model, and the dynamic amplification coefficient and inter story displacement are significantly smaller, which means the sand cushion isolation model behaves as if the structure is almost with no damage just as shown in the test.It is shown that the sand cushion has a good isolation effect and can effectively reduce the seismic input of the superstructure.

关键词

村镇建筑 / 砂垫层隔震结构 / 动力特性 / 动力响应 / 振动台试验

Key words

rural building / sand cushion isolation structure / dynamic characteristics / dynamic response / shaking table test

引用本文

导出引用
徐文杰,袁康,李英民,苟欣. 砂垫层隔震村镇建筑抗震性能振动台试验研究[J]. 振动与冲击, 2021, 40(18): 132-139
XU Wenjie,YUAN Kang,LI Yingmin,GOU Xin. Shaking table tests on the seismic performances of rural buildings with isolated sand cushion[J]. Journal of Vibration and Shock, 2021, 40(18): 132-139

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