承插式复合材料埋地管道抗震性能分析

Seismic behavior of the composite buried pipe connected with socket and spigot joint

为研究承插式复合材料埋地管道抗震性能,建立了由四个玻璃纤维/热固性材料铺层(0/90/0/90)组成的管体有限元模型。对承插式接口的力学性能进行了计算,并给出了接口在三个方向上的等效弹簧参数。对埋地管道在不同强度地震作用下的整体位移分布、各铺层的应力分布以及承插式接口的抗震性能进行了分析。结果表明,两个0°铺层的应力比两个90°铺层的轴向应力均增大75%左右;随着地震强度的增大,接口E轴向等效弹簧的相对位移与抗力随之提高;在0.2 g,0.4 g,0.6 g地震强度作用下下,管道中部接口E的相对位移均未超过界限位移值,均保持正常工作状态。

The finite element model for the buried pipe made with four composite layers( 0/90/0/90) connected bysocket and spigot joint is established to study its seismic behavior. The mechanic property of the joint is calculated and the corresponding parameters for the equivalent springs in three directions are obtained. Under varied earthquake intensity,the distribution of the pipe displacement,the effective stress in four composite layers and the seismic behavior of the joint are studied. Results indicate that: the axial stress in 0 degree layers is 75% larger than that in 90 degree layers;the relative displacement and resisting force in the equivalent springs located at joint E increase with the increasing earthquake intensity;the axial relative displacement at joint E is kept within the allowable value under the action of 0. 2 g,0. 4 g,0. 6 g seismic excitation and works in normal state under all three seismic intensities.