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    蘇州混凝土水泥制品研究院有限公司

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    水泥混凝土制品

    CFRP內襯法加固預應力鋼筒混凝土管的內水壓力試驗研究
    CFRP內襯法加固預應力鋼筒混凝土管的內水壓力試驗研究
    • 竇鐵生1,程冰清1,2 ,夏世法1,趙麗君1,董曉農1,2
    2021年第11期
    摘要
    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.
    預制混凝土襯砌管片模具自動開合裝置的研發
    預制混凝土襯砌管片模具自動開合裝置的研發
    • 尹懷秀,莊慧顯,王彥濤
    2021年第11期
    摘要
    引用本文
    摘 ? 要:為提高預制混凝土襯砌管片生產效率,結合自動化生產需要,針對手動開合模存在的不足,研發了自動化開合模裝置,并介紹了端模、側模開合原理及操作步驟,可為提高管片生產線自動化程度提供參考。 Abstract: In order to improve the reinforced concrete segment production efficiency, combined with the needs of automatic production, aiming at the shortcomings of manual mould opening and closing, an automatic mould opening and closing device is developed, and the opening and closing principles and operation steps of end mold and side mould are described respectively, which can provide a reference for improving the automation of segment production line.
    尹懷秀,莊慧顯,王彥濤.預制混凝土襯砌管片模具自動開合裝置的研發[J].混凝土與水泥制品,2021(11):49-50,54. YIN H X,ZHUANG H X,WANG Y T.Research on Automatic Opening and Closing Device of Reinforced Concrete Segment Mould[J].China Concrete and Cement Products,2021(11):49-50,54.
    荷載對盾構隧道管片力學性能影響的模擬分析
    荷載對盾構隧道管片力學性能影響的模擬分析
    • 覃智澤,韋向高,許顯龍
    2021年第11期
    摘要
    引用本文
    摘 ? 要:為了解荷載對盾構隧道管片的影響,基于混凝土塑性損傷本構模型,考慮內置鋼筋、連接螺栓與管片間的非連續性接觸,進行了荷載作用下管片受力破壞全過程的有限元模擬分析,研究了管片混凝土、連接螺栓與內置鋼筋的力學性能變化,并探討了土體抗力系數對管片受力與變形的影響。結果表明:在荷載作用下,管片封頂塊與標準塊接頭內側張開外側壓緊,鄰接塊接頭外側張開內側壓緊,管片初始破壞位置處于拱底處內側,以縱向裂縫為主,最終形成網狀裂縫;管片受力與變形受土體抗力系數影響顯著,其橢圓度、接頭張開量、螺栓、鋼筋應力隨土體抗力系數的增大而減小。 Abstract: In order to study the influence of load on the existing shield tunnels, the plastic-damage model was adopted to represent the nonlinear characteristics between concrete, built-in steel bars and connectinh bolt. The finite element analysis of the whole failure process under the surface surcharge was carried out, the stress changes of segment concrete, connecting bolts and built-in steel bars were studied, and the influence of soil resistance coefficient on the force and deformation of segment structure was discussed. The results show that the joint between the key block and the standard block is expanded and compressed on the outside, the location of the initial failure of the segment is at the inner surface at the bottom of the haunch, mainly longitudinal cracks, and finally form network cracks. The force and deformation of shield tunnel structure are significantly affected by the soil resistance coefficient. The ellipticity, joint expansion, bolt and steel stress of shield tunnel structure decrease with the increase of soil resistance coefficient.
    覃智澤,韋向高,許顯龍.荷載對盾構隧道管片力學性能影響的模擬分析[J].混凝土與水泥制品,2021(11):51-54. QIN Z Z,WEI X G,XU X L.Simulation Analysis of Influence of Load on the Mechanical Properties of Concrete Shield Segment[J].China Concrete and Cement Products,2021(11):51-54.
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