【作者】 尚守平； 卢华喜； 王海东； 余俊； 刘方成；

【Author】 SHANG Shou-ping, LU Hua-xi, WANG Hai-dong, YU Jun, LIU Fang-cheng (Civil Engineering College, Hunan University, Changsha 410082, China)

【机构】 湖南大学土木工程学院；

【摘要】 本文介绍了一个土-桩-框架结构1/2比例模型动力相互作用野外试验研究,通过对模型进行地脉动测试得到了其基频,并分别在忽略重力、欠人工质量、人工质量三种工况下进行了模型的顶部牵引激励试验和顶部机械激励试验,且在时域和频域内分析了试验结果,得到了一些有益结果。此外,研究了考虑土体动力非线性特征的粘弹性人工边界,提出了考虑桩土动力相互作用中桩土分离、滑移以及基础提离效应的接触模型,并引入阻尼项表征桩土动力作用中的能量损耗。建立了试验模型结构的三维有限元分析模型,通过对模型试验的模拟计算验证了有限元模型的可靠性,进而进行了不同地震动输入下的地震反应分析,总结了一些规律性结果。更多还原

【Abstract】 A 1:2 model of dynamic soil-pile-superstructure interaction is built and investigated on the outside site. Nature frequency is obtained through ground micro-tremor test, and model test of top draw-releasing vibration and top machine induced vibration are executed under neglecting the gravitational force、 short of artificial quality and artificial quality, and some results are got by analyzing of test data in time domain and frequency domain. Furthermore, take into account the dynamic nonlinear behaviors of soil, a viscous-spring artificial boundary is studied; and a new three-dimension contact model of soil-pile dynamic interaction is presented, which considers the effect of separating、 sliding and base uplifting in dynamic soil-structure interaction, and the energy dissipation during dynamic interaction is solved by adding the damping component. The three-dimension finite element model is established, and the model tests are simulated, the calculated results proved the finite element model is credible through comparing with the results of tests. Some regularity of soil-pile-structure interaction are obtained from earthquake response under different frequency spectrum features ground motion.更多还原