Study on Mechanical Properties of Socket Concrete Pipe Joints
In order to systematically investigate the mechanical properties of socketed concrete pipe joints,axial pulling and bending tests were carried out on concrete pipes of three pipe diameters,CDN400,CDN500,and CDN600,using prototype tests and numerical simulations.The axial tension-displacement curves and bending moment-angle curves of the pipe joints were derived from the tests,and the effects of pipe diameter size,socket interface type and joint installation gap on the mechanical prop-erties of the pipe joints were further analyzed.The results show that the size of the pipe diameter has a greater influence on the ultimate tensile force of the pipe,the ultimate bending moment before damage and the relative angle of rotation,while it has little influence on the axial relative displacement of the pipe,and the ultimate relative displacements of the three pipe diameters are all around 33 mm.The me-chanical properties of pipe joints vary greatly among different types of socket interfaces;Increasing the installation gap of pipe joints can significantly improve the bending capacity of the pipe,the pipe axial tensile force has a smaller impact but will reduce the axial relative displacement of the pipe.Increasing the installation gap increased by 5 mm can reduce the axial relative displacement by about 5 mm;The pipe limit angle-installation gap curve is obtained from the test data and its power function equation is fitted.
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