胡锋, 刘晓东, 袁阳光, 韩万水, 许昕, 王俊峰. 波形钢腹板组合箱梁带栓钉埋入式抗剪连接件承载力推出试验及有限元模拟分析研究[J]. 工程力学, 2021, 38(11): 43-56. DOI: 10.6052/j.issn.1000-4750.2020.09.0695
引用本文: 胡锋, 刘晓东, 袁阳光, 韩万水, 许昕, 王俊峰. 波形钢腹板组合箱梁带栓钉埋入式抗剪连接件承载力推出试验及有限元模拟分析研究[J]. 工程力学, 2021, 38(11): 43-56. DOI: 10.6052/j.issn.1000-4750.2020.09.0695
HU Feng, LIU Xiao-dong, YUAN Yang-guang, HAN Wan-shui, XU Xin, WANG Jun-feng. THE CAPACITY OF EMBEDDED SHEAR CONNECTOR STUDS OF COMPOSITE BOX GIRDERS WITH A CORRUGATED STEEL WEB BY PUSH-OUT TESTS AND FEM ANALYSES[J]. Engineering Mechanics, 2021, 38(11): 43-56. DOI: 10.6052/j.issn.1000-4750.2020.09.0695
Citation: HU Feng, LIU Xiao-dong, YUAN Yang-guang, HAN Wan-shui, XU Xin, WANG Jun-feng. THE CAPACITY OF EMBEDDED SHEAR CONNECTOR STUDS OF COMPOSITE BOX GIRDERS WITH A CORRUGATED STEEL WEB BY PUSH-OUT TESTS AND FEM ANALYSES[J]. Engineering Mechanics, 2021, 38(11): 43-56. DOI: 10.6052/j.issn.1000-4750.2020.09.0695

波形钢腹板组合箱梁带栓钉埋入式抗剪连接件承载力推出试验及有限元模拟分析研究

THE CAPACITY OF EMBEDDED SHEAR CONNECTOR STUDS OF COMPOSITE BOX GIRDERS WITH A CORRUGATED STEEL WEB BY PUSH-OUT TESTS AND FEM ANALYSES

  • 摘要: 针对一座波形钢腹板组合箱梁部分斜拉桥的受力需求,设计了带栓钉埋入式抗剪连接件。为研究其抗剪承载力,设计并开展了推出试验并进行了试验全过程的有限元模拟,对试验过程中试件的破坏及受力机理进行分析;随后根据该类型连接件的承载机理及受力特点,建立了承载力的近似计算方法。结果发现:对于该带栓钉埋入式抗剪连接件,当栓钉焊接在连接件波形板的直板外侧时,其承载力高于在内侧焊接的情形;当开孔位置位于直板、上折板与下折板时,其承载力依次降低;连接件波形板的上折板荷载-位移曲线存在明显的强化阶段,而下折板几乎不存在强化阶段,直板处荷载-位移曲线特征介于二者之间;另外,该类连接件混凝土开裂及主裂缝均在荷载水平达到0.8倍极限承载力以后形成发展的。所建立的推出试验全过程有限元模拟方法能够准确模拟试验过程中试件的受力行为,并能够诠释栓钉焊接位置、开孔位置对抗剪承载力的影响以及试件破坏机理;基于推出试验与有限元模拟分析,分析可得该类连接件承载力主要由波形板包裹的混凝土与约束钢筋所形成的块连接件、开孔内混凝土剪力销以及栓钉提供,随之建立的抗剪承载力近似计算方法分析结果与试验结果相对误差不超过8.93%,与有限元模拟结果相对误差不超过5.47%,具有良好的适用性。

     

    Abstract: To meet the mechanical requirement of an extradosed bridge of composite box girders with a corrugated steel web, an embedded shear connector with studs (ESCS) was designed. To investigate the shear resistance of the ESCS, push-out tests and the corresponding simulation using the finite element method (FEM) were designed and conducted. The mechanical performance and failure mechanism of the specimen were illustrated. According to the bearing mechanism and mechanical properties of the ESCS, an approximate calculation method of the shear resistance was developed. The results show that the shear resistance of ESCSs is higher when the studs are welded from outside the straight plate of the corrugated steel web than from the inner side. The shear resistance of the ESCS is the highest when the pored position is located at the straight plate, followed by that of the upper folded plate and the lower folded plate. The load-deflection curves of the upper folded plate of the corrugated steel web have an obvious strengthening stage, while those of the lower folded plate have almost no strengthening stage. The characteristics of the load-deflection curves of straight plates are between the upper and the lower folded plates. Moreover, the concrete cracking and the formation and development of major cracks occur after the load level exceeds 0.8 times the ultimate strength of the ESCS. The FEM can provide a relatively accurate simulation of the mechanical behavior of the specimen of the push-out test, and reflect the influences of stud welding position and pored position on the shear resistance. The failure mechanism can be illustrated according to the analysis results. By the analysis of both the push-out test and FEM simulation, the shear resistance of the ESCS is found to be provided by the block connector composed of the concrete surrounded by corrugated steel plates and the reinforcing steel, the concrete shear pin in the opening hole and the stud. The relative errors of the shear resistances between the approximate calculation method and the results of the push-out tests are less than 8.93%. The relative errors between the approximate calculation method and the results of the FEM simulations are less than 5.47%. It indicates that the approximate shear resistance calculation method is applicable.

     

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