钢管复合桩粘结-滑移性能研究

发布时间：2018-05-21 05:33

本文选题：钢管复合桩 + 泥皮　；参考：《西南交通大学学报》2017年03期

【摘要】：为研究内置剪力环、泥皮和防腐涂层的钢管复合桩的粘结-滑移性能,假定钢管复合桩粘结应力沿界面呈指数变化规律,提出了一种新的钢管复合桩粘结-滑移本构理论分析模型.依托港珠澳大桥建设,开展了5组钢管复合桩推出试验(其中2组试件设有剪力环),验证了本文模型的正确性.试验结果表明:在外荷载作用下,钢管与混凝土粘结滑移和钢管应力理论计算结果与实验结果基本吻合;粘结破坏时钢管于核心混凝土相对滑移量均小于0.2 mm,泥皮和防腐涂层降低了钢管与核心混凝土之间的粘结;在剪力环间距为1D(D为桩径)的条件下,剪力环使钢管复合桩的粘结强度提高约50%,泥皮和防腐涂层对钢管复合桩的弱化效应可不计.钢管复合桩粘结应力沿界面基本呈指数规律变化.
[Abstract]:In order to study the bond-slip behavior of steel pipe composite pile with built-in shear ring, mud skin and anticorrosive coating, it is assumed that the bond stress of steel pipe composite pile varies exponentially along the interface. A new bond-slip constitutive model of steel pipe composite pile is proposed. Based on the construction of Hongkong-Zhuhai-Macao Bridge, five groups of steel pipe composite pile launching tests were carried out (two of which were equipped with shear ring), which verified the correctness of the model in this paper. The experimental results show that the theoretical calculation results of bond slip and stress of steel tube and concrete under external load are in good agreement with the experimental results. The relative slippage of the steel tube to the core concrete is less than 0.2 mm when the bond is broken, and the slippage of the steel tube and the anticorrosive coating reduce the bond between the steel tube and the core concrete, and the shear ring spacing is 1D(D as the diameter of the pile. The shear ring increases the bond strength of steel tube composite pile by about 50%, but the weakening effect of mud skin and anticorrosive coating on steel pipe composite pile can be ignored. The bond stress of steel pipe composite pile changes exponentially along the interface.
【作者单位】：贵州理工学院土木工程学院;西南交通大学土木工程学院;
【基金】：贵州省科学技术基金资助项目(黔科合J字[2015]2062号)
【分类号】：TU473.1

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