An experimental study with 72 specimens was conducted to determine the effects of various factors on the mechanical behaviours of grouted sleeve connections, including an increase in temperature from 20 °C to 600 °C, the loading regime (uniaxial tensile loading or cyclic loading), and the grout compressive strength (83.1–91.1 MPa). After the specimens were exposed to elevated temperatures of up to 600 °C and then uniaxial tensile loading or cyclic loadings, the experimental results indicated that the sleeve was still elastic and the grout had a compressive strength of more than 83.1 MPa, which was beneficial for maintaining the mechanical behaviours of the specimens. In this study, the sleeve region was equal to the gauge length, which consisted of the length of the sleeve and three times the diameter of the rebar from each end of the sleeve. Moreover, a bilinear model was formulated to calculate the yield and ultimate loads of the heat-damaged grouted sleeve connections after different loading regimes. Finally, the constitutive relationship of the heat-damaged grouted sleeve connection was investigated. These findings will be helpful in the fire safety design of precast concrete structures.

进行了72个试样的实验研究，以确定各种因素对灌浆套筒连接的机械性能的影响，包括温度从20°C升高到600°C，加载方式（单轴拉伸加载或循环加载），灌浆的抗压强度（83.1-91.1 MPa）。在将样品暴露于最高600°C的高温下，然后单轴拉伸载荷或循环载荷后，实验结果表明，套筒仍然具有弹性，并且灌浆的抗压强度超过83.1 MPa，这对保持试样的机械性能。在这项研究中，套管区域等于标距，该长度由套管的长度和从套管两端开始的钢筋直径的三倍组成。此外，建立了一个双线性模型来计算在不同的加载方式后热损伤的灌浆套筒连接的屈服和极限载荷。最后，研究了热损伤灌浆套管连接的本构关系。这些发现将有助于预制混凝土结构的防火设计。