弯曲作用下承插式管道柔性接口力学性能试验

Test on mechanical properties of flexible interface in socket-type pipelines under bending action

为分析单调加载方式下不同加载速率对承插式柔性接口力学性能的影响规律,进行DN150 mm弯曲作用下球墨铸铁管道承插式柔性接口单调加载试验,并基于弯矩和转角、转角和拔出位移数据,建立柔性接口的弯矩转角-轴向位移关系所服从的一般规律,给出形式简洁的数学表达式。试验结果表明:1)在接口转角位移未达到接触转角位移时,加载速率对接口弯矩值影响较小;接口转角位移在接触转角位移之后,接口弯矩值的大小受加载速率的影响显著;2)接触转角位移小于2°时,主要为挤压变形;2°~4.7°(接触转角位移)主要为摩阻力及部分挤压变形;接触转角位移大于4.7°至加载停止主要为摩阻力。本文成果可为柔性接口管道抗震设计和施工提供一定参考。

In order to analyze the influence of different loading rates on the mechanical properties of socket-type flexible interface under monotonous loading mode,the monotonous loading test of socket-type flexible interface of ductile iron pipelines under DN150 mm bending action is carried out,and based on the bending moment and rotation angle,rotation angle and pull-out displacement data,the general law of the bending moment-rotation angle-axial displacement relationship of the flexible interface is established,and a concise mathematical expression is given.The test results show that:1)When the angular displacement of the interface does not reach the contact angular displacement,the loading rate has little influence on the bending moment value of the interface;After the interface angular displacement follows the contact angular displacement,the bending moment value of the interface is significantly affected by the loading rate.2)When the contact angular displacement is less than 2°,it is mainly extrusion deformation;2°~4.7°(contact angular displacement)is mainly frictional resistance and partial extrusion deformation;The contact angular displacement is greater than 4.7°to the loading stop,which is mainly the frictional resistance.The results can provide some references for the seismic design and construction of flexible interface pipelines.