【摘要】 利用最新研制的R500B振动台在450 g-t离心机上对砂土自由场地基在水平和垂直地震下的动态反应做了离心模拟试验研究。模拟离心重力场为30 g,振动台在水平和垂直方向的控制最大加速度分别为20 g和10 g。模型内布置相应的微型加速度计以测量地震反应。结果表明,在水平和竖向同时激振与单向分别激振砂土两种情况下,砂土地基有不同的动力反应,应在设计中予以考虑水平和竖向同时激振的耦合作用对砂土地基的影响。更多还原

【Abstract】 Seismic responses of free-field sand ground under horizontal and vertical earthquakes are investigated using a hydraulic earthquake simulator R500B installed on a 450 g-ton geotechnical centrifuge.The test is conducted under a centrifugal gravity field of 30 g with a minimum horizontal seismic acceleration of 20 g and vertical seismic acceleration of 10 g.Several accelerometers are used to measure the seismic responses of the free-field sand ground.The test result shows the seismic difference between the combined responses and the independent responses.The coupled seismic effects on the sand ground should be considered in design.更多还原