Prototype test on bearing capacity of BCCP under external load

To study the bearing capacity of bar-wrapped cylinder concrete pressure pipe (BCCP) under external load, tests on three prototype pipes with different diameters were designed.The strain gauges and displacement meters were arranged on the BCCP with diameter of 1 800 mm, and the force variation law of each part was obtained.The whole process of failure was verified by finite element simulation and test.Experimental results show that the process from applying prestress in production to ultimate failure can be divided into the following four stages:the concrete core is subjected to the force of prestressed steel bar without protective cover;the whole pipe is in the elastic stage before the protective cover at the waist cracks, corresponding to the stage when the external load in the test is less than 800 kN and the strain of each component increases linearly with the external load;the concrete at the top and bottom of the core is split, and when the external load reaches 1 600 kN, the concrete at the top and bottom of the core is split successively;the concrete around the waist of the core is crushed. © 2020, Editorial Board of Journal of Huazhong University of Science and Technology. All right reserved.