- 孫岳陽1，胡少偉1,2，明 攀1，薛 翔2
2020年第5期
摘要
引用本文
摘? ?要：為了研究管芯縱向裂縫對BCCP（鋼筋纏繞鋼筒混凝土壓力管）承受內、外壓能力的影響，選取合適的材料本構模型，利用ABAQUS軟件建立了DN1 800 BCCP內、外壓計算模型，在內壓管的鋼筒外管芯和外壓管的管頂鋼筒內管芯處分別設置了1 000 mm、2 000 mm、3 000 mm、4 000 mm的縱向裂縫，將計算結果與完好管進行了對比。結果表明，對于內壓管，外管芯縱向裂縫僅對外管芯達到受拉極限所對應的內壓值產生影響，且該值與縱向裂縫長度無關，均在2.95 MPa左右，比完好管小0.25 MPa；對于外壓管，管頂內管芯縱向裂縫僅對裂縫所在位置處達到受拉極限所對應的外壓值產生影響，同樣與縱向裂縫長度無關，均在1 200 kN左右，比完好管小300 kN；無論是內壓管還是外壓管，保護層、鋼筒和鋼筋達到極限強度時所對應的荷載值都與管芯有無裂縫以及裂縫長度無關。
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.?
孫岳陽,胡少偉,明攀,等.管芯縱向裂縫對BCCP承載能力影響研究[J].混凝土與水泥制品,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.
