论文部分内容阅读
在Novak边界层模型基础上,将桩周土分为非线性粘弹性内域和线弹性外域,采用随内域平均应变减小的等效剪切模量和增长的等效材料阻尼比近似考虑桩周土的非线性,并采用等效线性法对桩与土层耦合扭转振动进行了研究,得到了考虑桩-土动力相互作用的单桩桩顶扭转角及其扭转动力阻抗函数,然后通过算例对桩-土体系进行了扭转振动特性的参数分析。结果表明:桩顶激振扭转荷载的频率和幅值、外域土与桩的剪切波速比、内域土非线性范围以及桩长径比等因素对非线性土中单桩扭转动刚度和阻尼具有较大影响,所得结论为进一步研究桩-土-桥梁结构非线性动力相互作用机理提供了理论基础。
On the basis of the Novak boundary layer model, the soil around the pile is divided into the nonlinear viscoelastic inner domain and the linear elastic outer domain. Taking the equivalent shear modulus decreasing with the average inner strain decreasing and the equivalent damping ratio increasing approximately The nonlinearity of the soil around the pile is studied. The coupled linear torsional vibration of pile and soil is studied by the equivalent linear method. The torsion angle and torsional dynamic impedance function of single pile considering the pile-soil dynamic interaction are obtained. Example Analysis of Parameters of Torsional Vibration of Pile - soil System. The results show that the torsional stiffness and damping of single pile in nonlinear soil are influenced by such factors as the frequency and amplitude of torsional torsional load, the shear wave velocity ratio of outer soil and pile, the nonlinear range of inner soil, Which has great influence. The conclusions obtained provide theoretical basis for further studying the nonlinear dynamic interaction of pile-soil-bridge structure.