水平振动荷载作用下桩基动力特性  

Dynamic characteristics of a pile under horizontal vibration loading

作　　者：韩红霞[1,2] 崔武文[3] 李雨润[2] 

机构地区：[1]天津大学土木工程系,天津300072 [2]河北工业大学土木工程学院,天津300401 [3]天津财经大学,天津300222

出　　处：《振动与冲击》2015年第13期127-132,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(51008110);河北省住房和城乡建设厅应用研究项目(2010-254)

摘　　要：根据波动力学的基本方程和无限平面内圆孔辐射应力混合边值问题的计算理论,利用傅里叶展开法,求解出在水平简谐荷载作用下,考虑桩与周围土体部分脱开的物理现象时桩周土的动刚度和动阻尼。之后将其应用到Novak的无限薄层理论中,得到了在水平简谐荷载作用下单桩的动刚度、动阻尼以及桩的水平振动幅值随频率的变化曲线。分析可知,在水平振动荷载作用下,桩的水平动刚度较小,水平位移起主导作用;考虑了桩与周围土体局部分离的物理现象后,计算出的桩顶水平振动幅值和频率比较稳定,其结果更接近于试验值;计算时,土体的剪切模量采用由静态试验法测得的桩顶土剪切模量,计算结果与试验值更接近。Based on the basic equations of the theory of elastic wave propagation and the computation theory for the mixed boundary problems of radiant stress of a circular hole in an infinite plane the dynamic stiffness and damping of soil around a pile under horizontal harmonic loads were calculated by using Fourier expansion method considering the effect of pile’s partially separating from soils.Then they were used in to the infinitely thin horizontal layers theory of Novak,the stiffness and damping of the pile and its horizontal vibration amplitude versus frequency curve were obtained.It was shown that under horizontal vibration loads,the dynamic stiffness of the pile is smaller,and its horizontal displacement plays an important role;the calculated results considering the influence of pile-soil partial separation are less than those in other literatures with the assumption of bonding of the pile with soil,and they agree well with those of tests;the calculated results are closer to the test ones when the shear modulus of soil is measured with the static test method.

关 键 词：水平振动 动力特性 动刚度和动阻尼 共振峰值 共振频率 剪切模量 

分 类 号：TU473.1[建筑科学—结构工程]