在埋置框架中应力波传播的影响因素分析

Stress wave propagation and study on influencing factor in frame structure embedded partially in soil

基于埋置框架的回传射线矩阵法,分析桩土刚度比、荷载作用方向等对埋置框架轴力波、剪力波和弯矩波的影响,并与框架结构进行比较。结果表明:荷载作用方向对埋置框架的轴力波和弯矩波影响较大;由于土体的影响,埋置框架与普通框架的瞬态波有很大不同。

The principle of reverberation-ray matrix method of frame structure embedded partially in soil was researched.Axial and flexural wave motions in buried pile were subject to lateral pressure at the interface between pile and soil.The effects of the lateral bearing force exerted by the surrounding soil were represented by vertical elastic spring and horizontal elastic spring.The scattering matrix at joints was obtained from motion＇s equations and compatibility conditions.The reverberation-ray matrix for the structure was determined in terms of scattering matrix,phase matrix and permutation matrix.Thus the transient response of the structures was determined from the inverse Fourier transform.The results were checked in terms of motion＇s equations in time domain and wave-front arriving time.Based upon the reverberation-ray matrix of frame structure embedded partially in soil,the effect of pile-soil stiffness ratio,impulse duration,and impulse direction on axial wave,shear force wave and moment wave were analyzed.And the transient response of frame structure embedded partially in soil was compared with that of common frame.It showed that impulse direction has great effect on axial wave and moment wave of frame structure buried partially in soil,and the transient wave of frame structure buried partially in soil is different from that of common structure.