负载效应及基础效应对振动试验的影响在各种振动台的使用中都存在,但由于台面上的直接承受负荷小、低频下限较高(如电动式振动台、电磁式振动台),或上限频率较低(如机械式振动台),这种影响的量级较小,对试验结果影响不大,常被忽略不计。近十年来,国内由于军工、地震、道路模拟等试验需要,逐步发展起电液式振动台。该类型振动台面上直接承受负荷大,上限频率较高、频率下限又低,故负载效应及基础效应的影响比较突出。特别是利用电液振动台进行扫频振动试验及道路模拟等试验时,忽视这种影响不仅试验结果不可靠,而且容易造成试件的非正常破坏,甚至根本无法进行正常的试验工作.油压缩效应 The effects of load and foundation effects on the vibration test exist in the use of various shakers. However, due to the small direct bearing load on the work surface, the lower low-frequency limit is high (such as electrodynamic shakers and electromagnetic shakers) or the upper limit Lower frequency (such as mechanical shaking table), the magnitude of this effect is small, little effect on the test results, often neglected. In the past ten years, due to the need of military, earthquake, road simulation and other tests in China, the electro-hydraulic shaking table has been gradually developed. This type of vibration table directly bear the load, high frequency upper limit, low frequency and low, so the load effect and the impact of the underlying effect is more prominent. Especially when using the electro-hydraulic vibrating table to carry out tests such as swept frequency vibration test and road simulation, ignoring this kind of influence is not only unreliable test results, but also easy to cause abnormal destruction of test pieces, or even impossible to carry out normal test work. effect