轨道交通邻近建筑的砂袋垫层多维隔振试验研究

修建了足尺隔振建筑模型, 通过现场试验分析了砂袋垫层对竖向和水平向多维轨道交通环境振动的实际隔振效果. 结果表明: (1)砂袋垫层的压缩和剪切模量较小, 且等效阻尼比较大; (2)应用砂袋垫层后, 隔振频率远低于楼盖竖向和建筑物水平向的自振频率, 且远离轨道交通环境振动的主振频率; (3)应用砂袋垫层隔振措施后, 建筑室内的竖向和水平向加速度峰值减幅分别达79%和60%; (4)与此同时, 室内的竖向振动1/3倍频程分频振级减小近15dB, 水平向分频振级减小近12dB. 由此可知, 砂袋垫层可显著提升轨道交通多维激励下邻近建筑的室内舒适度.

Vibration suppressing test of a building with sandbag layers neighboring rail transportation

The vibration isolation effect of sandbag layers for the vertical and horizontal metro environmental vibration has been tested in this paper with a full-scale building model. The test results showed that: (1) The vertical and horizontal stiffness of sandbag layers were both small, and the equivalent damping ratios were high. (2) The isolation frequencies of buildings after installed sandbag layers were lower than the main frequency zones of subway environmental vibration. (3) The vertical and horizontal peak values of indoor acceleration were reduced greatly by using the sandbag layers, and the reduction magnitude reached 79% and 60%, respectively. (4) After installation of sandbag layers, the vertical third-octave frequency vibration levels were nearly reduced by 15dB, and the horizontal frequency vibration levels were nearly reduced by 12dB. So, the sandbag layers are benefitial to controlling the negative effect of metro environmental vibration, thus improving the human comfort inside the building.