管道在地震断层作用下的位移内力分析

地震断层对管道具有严重影响，它可以使管道产生变形，导致某一中分屈曲，进而影响管道的安全运行。管道穿越地震断层的计算是管道抗震分析的重要内容，而确定管道在这种情况下的位移和内力沿管道的分布，是进一步进行强度和刚度计算的基础。在管道地下移动时位移土抗力模式的基础上，对管道受，为作用在管道上的土抗力可分解为侧向的土压力及沿管轴方向的土壤摩擦力，从而使管道产生侧向移动和轴向移动，以五次Ｂ样条基函数的组合为

An Analysis on Displacement and Internal Force of the Pipeline in Seismic Fault.

Faults have such effects on pipelines as deformation, buckle and even pipeline abnormal operation. While the calculation of fault crossing pipeline takes an important role in pipeline aseismic analysis,the determination of distribution of displacement and internal force along the pipeline in a fault acts as the foundation to further strength and stiffness calculations. On the basis of the models of the soil stress during displacement around the pipeline, the stress analysis on pipeline shows that the stress of soil on pipeline consists of lateral soil pressure and axial soil friction, which result in the lateral and axial displacement of pipeline. Taking the combinatins of quintic B spline fundamental functions and cubic B spline fundamental functions as the test functions for lateral and axial displacements respectively, the residue elimination equation for vectors of the undetermined coefficient is given from the relationship between load and fisplacemend and point matching method. With boundary conditions being introduced,the linear equation, the matrix of coefficient of which is sparse matrix, can be obtained. Using point matching method, the displacement functions can be obtained by eliminating the residues and then the corresponding internal forces can be derived.