Study Of Transient Response Analysis Of Damping Frame Structure Embedded Partially In Soil Under Oblique Impact

The pile foundation has been widely applied in civil engineering. In actual engineering, many structures are single pile foundation embedded partially in soil, and many structures are pile group foundation, the most typical one is frame structure embedded partially in soil. There is no perfect research on wave response of pile foundation in these two kinds of structures under transient load. It has instructive significance to study the problem about the quality detection of pile foundation. Therefore, this paper focuses on the transient wave response of viscous-elastic single pile foundation embedded partially in soil and damping frame structure embedded partially in soil.Firstly, when the exciting force were horizontal or oblique acting at the top of pile, the transient wave response of viscous-elastic integrate single pile foundation embedded partially in homogeneous soil is researched. The effect of oblique angles of the exciting force, the depth ratio of buried pile, material damping of the pile and soil parameters on the transient wave response of the receiver is analyzed. It is shown that the depth ratio of buried pile is bigger, the reflected signal of pile bottom is weaker. The axial strain viscous damping of the pile material broaden the reflected wave width of the pile bottom.Secondly, the paper studied the transient wave response of viscous-elastic integrate single pile foundation embedded partially in two-layered soil(upper-soft and lower-hard or upper-hard and lower-soft), three-layered soil(soft interlayer or hard interlayer) under the oblique exciting force. The effect of overlying soil thickness, soft(hard) interlayer thickness on the transient wave response of the receiver is discussed. It is shown that the soil is harder, the reflected signal at the interface of this soil layer is stronger. The thickness of overlying hard soil layer and the hard interlayer is thicker, the reflected signal of pile bottom is weaker.Then the paper studied the transient wave response of viscous-elastic defective single pile foundation embedded partially in homogeneous soil under the oblique exciting force, and compared with viscous-elastic integrate single pile foundation embedded partially in homogeneous soil. The effect of defect degree, defect position on the transient wave response of the receiver is analyzed. It is shown that the reflected signal of the viscous-elastic neckexpanded pile and viscous-elastic neck-reduced pile embedded partially in homogeneous soil is reversed. The reflected signal of the viscous-elastic variable-modulus pile bottom has delay phenomenon.The paper studied the transient wave response of the damping frame structure embedded partially in homogeneous soil under the oblique exciting force, and compared with nondamping frame structure embedded partially in homogeneous soil. The effect of the direction of the exciting force, the depth ratio of buried pile, material damping and soil parameters on the transient wave response of the receiver is analyzed. It is shown that the amplitude of the velocity wave, shear force wave and moment wave of damping frame structure embedded partially in homogeneous soil is smaller than non-damping frame structure embedded partially in homogeneous soil. The effect of the material damping on the receiver’s velocity wave of damping frame structure embedded partially in homogeneous is different with the viscous-elastic single pile foundation.The paper studied the transient wave response of damping defective frame structure embedded partially in homogeneous under the oblique exciting force, and compared with damping non-defective frame structure embedded partially in homogeneous soil. The effect of defect degree, defect position on the transient wave response of the receiver is discussed. It is shown that the reflected signal of the defective pile bottom of damping defective frame structure embedded partially in homogeneous is weaker than damping non-defective frame structure embedded partially in homogeneous soil. The reflected signal of the defective pile bottom of damping variable-modulus frame structure embedded partially in homogeneous soil has delay phenomenon.Finally, main conclusion are summarized and further research suggestion are proposed.