斜拉索管桥应变影响因素的试验分析

Experimental Analysis on Strain Factors of Cable-stayed Pipelines

应力应变状态是管道在风险状态下受力的综合表现,关系到管道的力学安全。为确保管道安全运营,开展管道应力应变的研究。进行了斜拉索管桥的应变试验,详细研究了管道内流体流量、外加集中载荷和拉索断裂三种因素对斜拉索管桥的应变影响。实验结果表明:全流量和半流量状态下管道应变曲线很相似,四分之一流量和四分之三流量状态下管道应变曲线很相似。管道的应变随着集中载荷的增大而增大,在一定载荷内,管道的应变曲线成正弦波形且周期无明显变化。管桥的最大应变处位于距离作用点最近的拉索锚固点。在隔组破坏四组拉索后,斜拉索管桥并未发生严重变形,但是继续破坏拉索后,管道各个测点应变显著增大,斜拉索管桥发生严重变形。

Stress-strain state is a comprehensive performance of pipelines undertaken forces in the risk state,which is related to the mechanical safety of pipelines.In order to ensure safety operation of pipelines,stress-strain of pipelines should be carried out.Therefore,an experiment on strain of cable-stayed pipeline was carried out.The effects of three factors（flow of the fluid in the pipeline,concentrated load and cable fracture） on the strain of the cable-stayed pipeline were analyzed in the detail.The results show that the strain curves of the pipeline under the full-flow and semi-flow state are very similar,and the strain curves under the quarter flow and three-quarters flow also are similar.The strain of the pipeline increases with an increase of concentrated load.In a constant load,the strain curve of the pipeline is a cycle of sine wave with no significant changes in the cycle.The maximum strain locates on the nearest fixed point of cables.After four groups of cables are damaged,the cable-stayed pipeline has no serious deformation,but with more cables destroyes the strain of each measuring point is significantly increased and the cable-stayed pipeline deformes seriously.