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    邓友生, 张克钦, 赵明华, 李文杰, 宋虔, 马二立. 连梁-桩结构荷载传递特性试验研究[J]. 应用基础与工程科学学报, 2024, 32(5): 1474-1485. DOI: 10.16058/j.issn.1005-0930.2024.05.020
    引用本文: 邓友生, 张克钦, 赵明华, 李文杰, 宋虔, 马二立. 连梁-桩结构荷载传递特性试验研究[J]. 应用基础与工程科学学报, 2024, 32(5): 1474-1485. DOI: 10.16058/j.issn.1005-0930.2024.05.020
    DENG Yousheng, ZHANG Keqin, ZHAO Minghua, LI Wenjie, SONG Qian, MA Erli. Experimental Investigation on Load Transfer Characteristics of Coupling Beam Pile Structure[J]. Journal of Basic Science and Engineering, 2024, 32(5): 1474-1485. DOI: 10.16058/j.issn.1005-0930.2024.05.020
    Citation: DENG Yousheng, ZHANG Keqin, ZHAO Minghua, LI Wenjie, SONG Qian, MA Erli. Experimental Investigation on Load Transfer Characteristics of Coupling Beam Pile Structure[J]. Journal of Basic Science and Engineering, 2024, 32(5): 1474-1485. DOI: 10.16058/j.issn.1005-0930.2024.05.020

    连梁-桩结构荷载传递特性试验研究

    Experimental Investigation on Load Transfer Characteristics of Coupling Beam Pile Structure

    • 摘要: 针对高层建筑地基易产生蝶形沉降的缺陷,提出一种便于施工且整体性较强的连梁-桩结构基础.为研究新型基础的竖向承载特性,开展了室内模型试验,并通过有限元方法进一步计算其特性.建立塑性损伤模型以研究结构受荷时的易损区域,为结构设计提供参考.试验与计算研究结果表明:连梁-桩结构的荷载-沉降曲线为缓变型,其沉降相较于群桩减小38.92%;轴力在连梁与桩连接处会产生突变减小,连梁对于桩体受力具有改善作用,不同位置桩体轴力分布大致相同,连梁轴力大于桩体;连梁内外摩阻力差异较大,内侧摩阻力接近于0而外侧摩阻力较大;连梁在受荷过程中能发挥良好荷载传递作用,产生较大的拉力;连梁-桩结构不存在传统基础的蝶形沉降现象;组合结构基础的主要受压损伤区域为下部桩体,连梁主要受拉损伤,连梁的四角处与桩-连梁连接处为结构易损面,应对其进行适当加固.

       

      Abstract: For the defects of butterfly settlement of high-rise building foundations,a convenient and integral coupling beam pile structure foundation is proposed.To investigate the vertical load-bearing characteristics of the new foundation,indoor model tests were carried out and the properties were further calculated by the finite element method.A plastic damage model is established to analyze the vulnerable areas,which provides a reference for the design of structure.The test and calculation results show that the load-settlement curve of the coupling beam pile structure is slow-varying.Compared with the pile group,its settlement was reduced by 38.92%.The axial force is abruptly reduced at the connection between the beam and the pile.The coupling beam has an improved effect on the pile force,the pile axial force distribution is approximately the same at different locations,the coupling beam axial force is greater than the pile.The difference between the inner and outer shaft resistance of the coupling beam is large.The inner shaft resistance of the coupling beam is close to zero while the outer shaft resistance is significant.The beam can play a good load transfer role during the loading process by generating a significant amount of tensile force,and the coupling beam pile structure does not experience the butterfly settlement phenomenon when the traditional foundation is loaded.The main compression damage area of the combined structural foundation is the lower pile.The coupling beam is mainly subject to tensile damage.The corners of the coupling beam and the pile-beam connection are the vulnerable surfaces of the structure,which should be properly strengthened.

       

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