Environmental shrinkage cracks are obviously observed in bolted-type glulam joints due to the material mechanical-physical properties and high moisture transport rate. The objective of ongoing research mainly presents an experimental study on the mechanical properties of bolted-type glulam joints with cracks. To shorten the test time and control the crack pattern, the outer moisture-induced shrinkage cracks are replaced by preset cracks. Thus, thirteen glulam joints with different preset cracks are designed and tested. The parameters are three locations (i.e., along the top bolts, neutral axis, and bottom bolts), two lengths (i.e., 140 mm, and 330 mm), three depths (i.e., 30 mm, 60 mm, and 118 mm), and two kinds of layouts (i.e., cracks on the same side and different sides). In the experiments, the loading process and failure modes of the joints were observed, the load-displacement relationships were analyzed and the residual bearing capacity of the joints was recorded. The joint exposed to the controlled climate change test showed that longitudinal cracks were easily observed along with the bolts in multiple steel-to-wood joints and four reasons were presented for this phenomenon. Furthermore, significant reduction values were observed due to cracks for joints in terms of their initial stiffness k, peak load P_max, and displacementΔ_max up to 79.3%, 75.39%, and 95.1%, respectively. Additionally, reduction coefficients were proposed for the calculation of residual bearing capacity. The calculation results showed good consistency with the experimental tests.

在螺栓型胶合层中明显观察到环境收缩裂缝接头由于材料的机械物理性能和高的水分传输速率而引起。正在进行的研究目标主要是对带有裂纹的螺栓型胶合节力学性能进行实验研究。为了缩短测试时间并控制裂纹模式，将外部湿气引起的收缩裂纹替换为预设裂纹。因此，设计并测试了具有不同预设裂纹的13个胶合节。参数是三个位置（即沿顶部螺栓，中性轴和底部螺栓），两个长度（即140毫米和330毫米），三个深度（即30毫米，60毫米和118毫米），和两种布局（即同一侧和不同侧的裂缝）。在实验中，观察了接头的加载过程和破坏模式，分析了载荷-位移关系，并记录了接头的残余承载力。受到气候变化控制试验的联合表明，在多个钢木接头中很容易观察到纵向裂纹以及螺栓，并提出了造成这种现象的四个原因。此外，还由于对关节裂缝在它们的初始刚度方面观察到显著降低值ķ，峰值负载P_最大，和位移Δ_最大值分别高达79.3％，75.39％，和95.1％。另外，提出了折减系数来计算剩余承载力。计算结果与实验结果吻合良好。