Precast columns are widely adopted in Accelerated Bridge Construction (ABC) due to its fast construction speed, environment amity and little interference to existing traffic. The bending behavior of precast columns with grouted sleeve connections under seismic effect has been widely studied. However, studies on the shear behavior of this kind of columns (for example, short columns under seismic effect) are limited, which restricts the application of ABC in seismic regions. This study proposes an approach for evaluating the shear cracking mechanism of sleeve region and the shear strength of precast columns with grouted sleeve connection. In this approach, the sleeve units and concrete units in the sleeve region are established according to the different stiffness between sleeve and concrete, individually. The cracking angle of membrane element of units is solved based on the Modified Compression Field Theory (MCFT). Thus, the crack developing diagram is drawn in light of the cracking range of units. An improved model for computing the shear strength of precast columns with grouted sleeve connection is presented by the predicted cracking method in this paper. A skeleton curve prediction method based on the principal compressive strain in compression zone has also been proposed and verified. In general, the improved MCFT method given in the paper is effective for predicting shear failure of precast bridge columns with sleeve connection.

预制柱由于其施工速度快，环境友好且对现有交通的干扰小而被广泛用于加速桥梁建设（ABC）。带有注浆套筒连接的预制柱在地震作用下的弯曲行为已得到广泛研究。但是，这类柱子（例如，受地震作用的短柱）的抗剪性能的研究受到限制，这限制了ABC在地震区域中的应用。这项研究提出了一种评估套筒区域的剪切开裂机理和带有注浆套筒连接的预制柱的抗剪强度的方法。在这种方法中，分别根据套筒和混凝土之间的不同刚度来建立套筒区域中的套筒单元和混凝土单元。基于修正压缩场理论（MCFT）求解单元膜单元的开裂角。因此，根据单元的破裂范围绘制了裂缝发展图。通过预测的开裂方法，提出了一种改进的计算带灌浆套管连接的预制柱抗剪强度的模型。提出并验证了基于压缩带主压缩应变的骨架曲线预测方法。通常，本文给出的改进的MCFT方法可有效预测带有套筒连接的预制桥梁柱的剪切破坏。通过预测的开裂方法，提出了一种改进的计算带灌浆套管连接的预制柱抗剪强度的模型。提出并验证了基于压缩带主压缩应变的骨架曲线预测方法。通常，本文给出的改进的MCFT方法可有效预测带有套筒连接的预制桥梁柱的剪切破坏。通过预测的开裂方法，提出了一种改进的计算带灌浆套管连接的预制柱抗剪强度的模型。提出并验证了基于压缩带主压缩应变的骨架曲线预测方法。通常，本文给出的改进的MCFT方法可有效预测带有套筒连接的预制桥梁柱的剪切破坏。