不同建造方式管廊结构振动台模型试验研究

为探究地下综合管廊腋角高度、建造方式对管廊结构加速度、层间位移、钢筋应变影响,完成管廊模型地震响应振动台试验。设计4个相似比为1/6的管廊模型,在El Centro波作用下通过输入不同的频率、幅值,研究不同参数对管廊动力响应影响。研究结果表明:增大腋角高度对管廊结构加速度的作用易受到管廊结构本身及周围土体非线性的影响;腋角高度对装配式管廊影响大,增大相同腋角高度装配式管廊结构的层间位移降低30%~50%,而整浇式管廊降低10%~30%;在强震时建造形式对加速度及管廊顶板、底板的层间位移影响均较大;增加腋角高度,两种管廊钢筋应变均变小,装配式管廊变化大;装配式管廊钢筋应变大于整浇式管廊钢筋应变。

Shaking table model test of pipe gallery structure with different construction methods

In order to explore the influence of the height of the corner widening height and the construction method of the underground comprehensive pipe gallery on the acceleration,story displacement and reinforcement strain of the pipe gallery structure,the shaking table test of the seismic response of the pipe gallery model was completed.Four pipe gallery models with the similar ratio of 1/6 were designed.The effects of different parameters on the dynamic response of pipe gallery were studied by inputting different frequencies and amplitudes under the action of El Centro wave.The results show that the effect of increasing the corner widening height on the acceleration of the pipe gallery structure is easily affected by the nonlinearity of the pipe gallery structure and surrounding soil;the corner widening height has a great influence on the fabricated pipe gallery,by increasing the same corner widening height,the fabricated pipe gallery displacement decreased by 30%~50%,while the whole casting pipe gallery displacement decreased by 10%~30%;in the case of strong earthquake,the construction method has a great influence on the acceleration and the floor displacement of the top and bottom of the pipe gallery;when increasing the corner widening height,the steel strain of two kinds of pipe gallery became smaller and the fabricated pipe gallery changed greatly;the steel strain of the fabricated pipe gallery is larger than that of the whole casting pipe gallery.