- 竇鐵生1，程冰清1,2 ，夏世法1，趙麗君1，董曉農1,2
引用本文摘 ?要：通過內水壓力試驗，研究了CFRP內襯法加固預應力鋼筒混凝土管（PCCP）的結構力學性能和破壞模式，并采用光纖布拉格光柵（FBG）感測技術測試了試驗過程中PCCP各層結構和CFRP內襯的變形情況，得到了內水壓力作用下PCCP結構的力學響應規律。同時，模擬了在所有預應力失效的情況下，PCCP的力學性能及破壞情況。結果表明，在內水壓力為1.8 MPa時，PCCP原管管芯混凝土開裂，而CFRP加固管在加壓至1.9 MPa后發生開裂，表明CFRP內襯能夠有效增強管芯混凝土的延性，有效延緩管芯混凝土開裂，提高PCCP抗裂性能。同時，CFRP內襯法加固所有預應力失效的PCCP能夠承受原設計內水壓力，表明CFRP內襯能夠恢復受損嚴重PCCP的承載能力。 Abstract: The mechanical properties and failure modes of PCCP reinforced by CFRP liner were studied through the hydrostatic pressure prototype test of PCCPs. Fiber Bragg Grating (FBG) sensing technology was used to test the deformation of the PCCPs and the CFRP liner during the test, and the mechanical response law of PCCP reinforced by CFRP liner under internal water pressure was obtained. Meanwhile, ?the simulation on the failure of extreme cases where all prestress of the PCCP were carried out. The results show that the concrete core of the original pipe cracks when the internal water pressure is 1.8 MPa, while the pipe reinforced by the CFRP liner cracks after the pressure is 1.9 MPa. CFRP liner can enhance the ductility, effectively delay the cracking of the concrete core, and improve the strength and crack resistance of the PCCP. The PCCP without prestress reinforced by CFRP liner can bear the original design internal water pressure, indicating that CFRP liner can restore the original bearing capacity of a PCCP with serious damage.?
竇鐵生,程冰清,夏世法,等.CFRP內襯法加固預應力鋼筒混凝土管的內水壓力試驗研究[J].混凝土與水泥制品,2021(11):44-48. DOU T S,CHENG B Q,XIA S F,et al.Study on Hydrostatic Pressure Testing of PCCP Strengthened by CFRP Liner[J].China Concrete and Cement Products,2021(11):44-48.