基于土与结构相互作用的铰桩-人工土复合地基结构减震的振动台试验研究

设计了一种新型的铰桩-人工土复合地基,并分别对刚性地基-框架结构体系模型及铰桩-人工土复合地基-框架结构体系模型进行了小型振动台试验研究。在铰桩-人工土地基-框架结构体系的模型试验中,采用了木屑土以及层状剪切土箱模拟实际场地的人工土,用两端带铰的桩模拟产生端塑性铰的桩,并在振动台上输入ElCentro波。试验结果表明,其地震反应较之刚性地基-框架结构体系有很大变化。在铰桩-人工土复合地基上,框架结构各层加速度、层间剪力明显减小,自振周期增大,特别是阻尼有很大的提高,说明此复合地基有明显的减震效果。

Study on Hinge Pile and Artificial Soil Compound Foundation Based on SSI Theory by Shaking Table Test

The hinge pile-artificial soil compound foundation was designed,and the rigid foundation-frame system model and hinge pile and artificially soil compound foundation-frame system model were studied by mini-shaking table test.Sawdust and shear-box were adopted in the test to imitate the practical soil and pile foundation with hinges on both ends was adopted to imitate the pile which yields on both ends,and El Centro wave was input.The results show that the reaction of the structure on the compound foundation is quite different from that on the rigid foundation.Comparing with the test results of the structure on the rigid foundation,the acceleration and the shear force of structure reduce obviously,and the natural period,especially the damp is obviously increased.It means that the new compound foundation absorbs the seismic energy well.