房建材料及制品_2022_《混凝土与水泥制品》杂志社

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发布时间：2020-01-06 00:00:00

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房建材料及制品

钢筋上焊接锚固板半灌浆套筒力学性能有限元分析

孙志远1，陈权1，夏文传1，姚兵2，刘建2

2022年第10期

摘要

引用本文

摘要：为了减小装配式结构连接用半灌浆套筒破坏时的变形，提出了一种改进的半灌浆套筒，即在钢筋上焊接锚固板，以增加灌浆料与钢筋的机械咬合力。基于已有的半灌浆套筒单调拉伸试验，利用Midas FEA NX有限元软件进行模拟。结果表明：采用混凝土本构模型可以很好地模拟灌浆料的本构模型；半灌浆套筒的破坏状态、模拟结果与试验结果基本吻合，说明所建立的有限元模型是可行的；锚固板的使用不能提高套筒的抗拉强度，但可以大幅提高套筒的整体刚度，提高幅度为8%~10%。 Abstract: In order to reduce the deformation of the semi-grouting sleeve used for the connection of prefabricated structures, an improved semi-grouting sleeve was put forward, in which the anchor plate was welded on the steel bar to increase the mechanical occlusal force between the grouting sleeve and the steel bar. Based on the existing monotonic tensile test of the semi-grouting sleeve, the simulation was carried out using Midas FEA NX finite element software. The results show that the constitutive model of the grouting material can be well simulated by the concrete constitutive model. The failure state of semi-grouting sleeve and the simulation results are basically consistent with the test results, indicating that the finite element model established is feasible. The use of the anchor plate cannot improve the tensile strength of the grouting sleeve, but can greatly improve the overall stiffness of the sleeve by 8% to 10%.

孙志远,陈权,夏文传,等.钢筋上焊接锚固板半灌浆套筒力学性能有限元分析[J].混凝土与水泥制品,2022(10):74-77. SUN Z Y,CHEN Q,XIA W C,et al.Finite Element Analysis of Mechanical Properties of Semi-grouting Sleeve for Welded Anchorage Plate on Steel Bar[J].China Concrete and Cement Products,2022(10):74-77.

GFRP加固损伤钢筋混凝土（RC）短梁受弯性能试验研究

吴玉祥，王廷彦，赵顺波

2022年第10期

摘要

引用本文

摘要：对GFRP布加固未损伤和损伤普通钢筋混凝土（RC）短梁进行了受弯试验，研究了其破坏形态、材料（混凝土、钢筋、GFRP布）应变、抗弯承载力、挠度、曲率和抗弯刚度。结果表明：GFRP布加固未损伤和损伤RC短梁的极限破坏特征一致，破坏时GFRP布被拉断，受压区混凝土未被压碎，属于延性破坏；GFRP布加固未损伤和损伤RC短梁的跨中截面混凝土应变均近似符合平截面假定；GFRP布加固未损伤和损伤RC短梁的荷载-挠度曲线分别呈三阶段和两阶段特征，GFRP布加固损伤RC短梁的荷载-挠度曲线没有开裂阶段，试件的极限承载力得到一定提高；采用GFRP布加固可提高试件的刚度，但会降低其延性；对比GFRP布加固未损伤RC梁，GFRP布加固损伤RC梁的延性提高。 Abstract: Through the flexural tests on undamaged and damaged ordinary reinforced concrete(RC) short beams strengthened with GFRP sheets, the failure modes, material(concrete, steel bar, GFRP sheet) strain, flexural capacity, deflection, curvature and flexural stiffness were studied. The results show that the ultimate failure characteristics of the undamaged and damaged RC short beams strengthened with GFRP sheets are the same, both belong to the ductility failure in which the GFRP sheets are pulled off and the concrete in the compression zone is not crushed. The concrete strains of the mid-span section of the undamaged and damaged RC short beams strengthened with GFRP sheets are approximately consistent with the assumption of plane section. The load-deflection curves of the undamaged and damaged RC short beams strengthened with GFRP sheets are three stages and two stages respectively, and the load-deflection curve of the damaged RC short beams strengthened with GFRP sheets has no cracking stage, and the ultimate bearing capacity of the specimen is improved to a certain extent. Using GFRP sheets can improve the stiffness of the specimen, but it will reduce its ductility. Compared with the undamaged RC short beams strengthened with GFRP sheets, the ductility of the damaged RC short beams strengthened with GFRP sheets is improved.

吴玉祥,王廷彦,赵顺波.GFRP加固损伤钢筋混凝土（RC）短梁受弯性能试验研究[J].混凝土与水泥制品,2022(10):65-69,73. WU Y X,WANG T Y,ZHAO S B.Experimental Study on Flexural Behavior of Damaged Reinforced Concrete(RC) Short Beams Strengthened with GFRP Sheets[J].China Concrete and Cement Products,2022(10):65-69,73.

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