- 孙岳阳1，胡少伟1,2，明 攀1，薛 翔2
引用本文摘 要：为了研究管芯纵向裂缝对BCCP（钢筋缠绕钢筒混凝土压力管）承受内、外压能力的影响，选取合适的材料本构模型，利用ABAQUS软件建立了DN1 800 BCCP内、外压计算模型，在内压管的钢筒外管芯和外压管的管顶钢筒内管芯处分别设置了1 000 mm、2 000 mm、3 000 mm、4 000 mm的纵向裂缝，将计算结果与完好管进行了对比。结果表明，对于内压管，外管芯纵向裂缝仅对外管芯达到受拉极限所对应的内压值产生影响，且该值与纵向裂缝长度无关，均在2.95 MPa左右，比完好管小0.25 MPa；对于外压管，管顶内管芯纵向裂缝仅对裂缝所在位置处达到受拉极限所对应的外压值产生影响，同样与纵向裂缝长度无关，均在1 200 kN左右，比完好管小300 kN；无论是内压管还是外压管，保护层、钢筒和钢筋达到极限强度时所对应的荷载值都与管芯有无裂缝以及裂缝长度无关。 Abstract: In order to study the effect of longitudinal crack on the capacity of BCCP under internal or external pressure, the finite element software ABAQUS was used to establish two calculation models with the same diameter of 1 800 mm and appropriate material constitutions were selected. The longitudinal cracks of 1 000 mm, 2 000 mm, 3 000 mm and 4 000 mm in length were arranged in the outer core of BCCP under internal pressure and in the top of the inner core under external pressure. The calculated results were compared with those of the intact pipe. The results show that for the pipe under internal pressure, the longitudinal crack of the outer core only affects the pressure corresponding to the tensile limit of the outer core, and this value is independent of the crack length, which is about 2.95 MPa, and is 0.25 MPa smaller than that of the intact pipe. For the pipe under external pressure, the longitudinal crack in the top of the inner core only affects the pressure corresponding to the tensile limit at the location of the crack, which is also independent of the crack length. The calculation results of loads are all around 1 200 kN, which is 300 kN smaller than that of the intact pipe. Whether BCCP is under internal or external pressure, the loads corresponding to the protective cover, cylinder and steel bar when they reach the ultimate strength are independent of the cracks in core and length of cracks.
孙岳阳,胡少伟,明攀,等.管芯纵向裂缝对BCCP承载能力影响研究[J].混凝土与水泥制品,2020(5):28-33. SUN Y Y, HU S W,MING P,et al.Study on the Effect of Longitudinal Crack in Core Pipe on the Bearing Capacity of BCCP[J].China Concrete and Cement Products,2020(5):28-33.