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土-结构动力相互作用是地震工程和结构抗震的重要研究内容,但目前对爆破地震作用下土-结构动力相互作用的研究较少。运用大型有限元软件ANSYS/LS-DYNA,建立了桩-土-结构相互作用体系的三维有限元模型,由桩尖输入实测爆破地震波,取得了良好的计算效果。计算结果表明:考虑桩-土-结构相互作用后,群桩基础中每个桩的位移、加速度和剪应力幅值均呈桩顶大、桩尖小的倒三角分布,桩与承台的接合部比较容易受到损坏;桩-土-结构相互作用体系在爆破地震波冲击后,还会发生几次振动,但是这些振动产生的影响要小于爆破地震产生的影响,这与实测结果相符合;爆破地震波冲击下,群桩基础中,角桩顶部表面的桩土接触压力较大,但在爆破地震波冲击后,中心桩顶部表面的桩土接触压力较大,且具有一定的周期性,直至衰减为零。
Soil-structure dynamic interaction is an important research topic of earthquake engineering and structure aseismic. However, there are few researches on soil-structure dynamic interaction under blast-induced earthquake. A three-dimensional finite element model of pile-soil-structure interaction system was established by using the large-scale finite element software ANSYS / LS-DYNA. The measured blasting seismic wave was input from the pile tip, and a good calculation result was obtained. The calculated results show that the displacement, acceleration and shear stress of each pile in the pile foundation are in the form of large pile top and small inverted triangular distribution when the pile-soil-structure interaction is considered. The damage of pile-soil-structure interaction system is more likely to be damaged. The vibrations of pile-soil-structure interaction system may occur several times after the blasting seismic wave impact, but the influence of these vibrations is smaller than that of blasting earthquake, which is consistent with the measured results. Under the impact, the pile-soil contact pressure on the top surface of the pile is larger than that on the top surface of the pile. However, after the blasting seismic shock, the pile-soil contact pressure on the top surface of the center pile is larger and has a certain periodicity until the attenuation is zero .