地铁邻近建筑的砂袋垫层基础隔振试验研究

盛涛,1.2.3,李水明2,刘干斌3,侯姗3, 王建超3

振动与冲击 ›› 2017, Vol. 36 ›› Issue (24) : 44-50.

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (24) : 44-50.
论文

地铁邻近建筑的砂袋垫层基础隔振试验研究

  • 盛涛,1.2.3 , 李水明2,刘干斌3,侯姗3, 王建超3
作者信息 +

Tests for subway nearby building's base vibration isolation with sandbag layers

  • SHENG Tao1,2,3 , LI Shuiming2, LIU Ganbin3, HOU Shanshan3 , WANG Jianchao3
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摘要

以某地铁线路邻近的3层钢筋混凝土框架结构为原型,通过建立1/8缩尺模型开展了地铁激励下的砂袋垫层基础隔振试验,分析和预测了应用砂袋垫层提高楼盖竖向振动舒适度的有效性。相似比设计和模型试验的结果表明:(1)缩尺模型结构的混凝土弹性模量和楼盖的竖向自振频率均符合相似比要求,且砂袋的竖向刚度与其几何尺寸直接相关,能符合隔振频率的相似性要求,因此模型试验能真实反应原型结构和隔振层的动力特性;(2)砂袋的抗压刚度远小于上部结构的柱子轴压刚度,应用砂袋形成的基础隔振层对提升地铁邻近建筑的室内舒适度效果明显,其中5层砂袋叠放时,可使地铁激励下原型建筑楼盖的1/3倍频程分频振级最大减小约28dB;(3)砂颗粒间的摩擦耗能机理使得砂袋垫层基础隔振结构对低频环境振动的抗干扰性更强,可有效控制道路交通环境振动造成的负面影响,因此其适用范围更广。

Abstract

A 3-story RC frame structure near subway was taken as the original type structure, a 1/8-scale model was built to perform tests for its vibration isolation with sandbag layers under subway-induced vertical excitation. The effectiveness of apply sandbag layers to improve vertical vibration comfort of the building floor system was analyzed and predicted. Similarity ratio design and model test results showed that (1) the RC elastic modulus of the scale model and the vertical natural frequency of the building floor system meet the requirements of similarity ratio; the vertical stiffness of sandbag layer is directly related to its geometric sizes, it satisfies the similarity requirements of the base-vibration isolation frequency; so the model tests can reflect the dynamic characteristics of the original type structure and vibration isolation layer; (2) the vertical compression stiffness of sandbag layer is much smaller than the axial compression stiffness of upper structure’s column, so the base vibration isolation layer formed with sandbags can obviously improve the inside comfort of the building near subway, when five-layer sandbags stack up, the 1/3 octave frequency division vibration level of the original type structure was reduced 28dB ultimately; (3) the friction energy dissipation mechanism among sand grains makes the base vibration isolation structure with sandbag layers have a stronger anti-disturbance ability against low-frequency environmental excitations to effectively control the negative effects caused due to subway traffic environment vibrations, so the applicability of the base vibration isolation structure with sandbag layers is much wider.
 
 

 

关键词

砂袋垫层 / 地铁 / 竖向隔振 / 舒适度 / 低频振动。

Key words

sandbag layer / subway / vertical vibration isolation / comfort / low frequency vibration

引用本文

导出引用
盛涛,1.2.3,李水明2,刘干斌3,侯姗3, 王建超3. 地铁邻近建筑的砂袋垫层基础隔振试验研究[J]. 振动与冲击, 2017, 36(24): 44-50
SHENG Tao1,2,3,LI Shuiming2, LIU Ganbin3, HOU Shanshan3,WANG Jianchao3. Tests for subway nearby building's base vibration isolation with sandbag layers[J]. Journal of Vibration and Shock, 2017, 36(24): 44-50

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