软土-铰接桩体系隔震性能的振动台试验研究

设计并实现了软土-铰接桩体系隔震性能的振动台试验,通过试验研究了这种新型隔震体系对上部结构动力反应的影响。本试验采用块状海绵作为模型土,并采用两端铰接的新型群桩基础,以模拟剪切模量较小的软土地基。此外,采用振型分解法的计算机程序对试验模型进行了计算。研究结果表明,软土地基情况下结构的自振周期远大于刚性地基上结构的自振周期,软土地基情况下的结构阻尼远大于刚性地基情况下的结构阻尼,结构的地震反应有所减小,加速度反应减幅达到40%以上。这说明这种新型的软土地基起到了隔震减震的作用。所提出的软土-铰接桩体系,是地基-基础-上部结构动力相互作用的发展与应用。

Shaking table testing of shock insulation by Soft soil-hinged pier system

Shaking table model tests of shock insulation by soft soil-hinged pier system are designed and carried out.By the testing,the effects of this new system on the earthquake response of structure were analyzed.The sponge and the pile foundation with hinges on both ends were adopted in this test to imitate the soft soil with small shear modulus.The earthquake reaction of Soil-Structure-Interaction system was calculated by a program of modal analysis method.The results show that the natural period of the structure on rigid foundation is much longer than that on soft soil founda-tion,and that the damping is much larger too.The earthquake response of the structure is reduced and the ratio reach-es 40%.It means that the soft soil foundation has the impact on shock absorption and isolation.The soft soil-hinged pier system is the development and application of the soil-foundation-structure interaction.