The timber board interlayer is applied as the formwork for the pouring of concrete slab in various practical applications of timber–concrete composite structures, with the rehabilitation of timber buildings, in particular. At present, there are few studies performed to study the shear stiffness of inclined screws in timber–concrete composite beams with timber board interlayer. In this article, eight groups of shear tests were carried out to study the shear stiffness of inclined screws in timber–concrete composite beams with timber board interlayer. The key parameters included the embedment depth of the screw connector into timber, screw diameter, the thickness of concrete slab, and concrete strength. As indicated by the test results, the shear stiffness of the inclined screws was improved as the embedment depth of screw into timber and screw diameter increased. When the embedded depth of screw into concrete remained unchanged, the thickness of concrete slab and concrete strength exhibited no significant impact on the shear stiffness of inclined crossing screws. On the basis of the theory of a beam on a two-dimensional elastic foundation, the calculation method for predicting the shear stiffness of inclined screw in timber–concrete composite beams with interlayer was proposed. The comparisons demonstrated that the shear stiffness of inclined screw can be well predicted using the calculation method.

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带木板夹层的木-混凝土组合梁斜螺钉的抗剪刚度

木板夹层在木-混凝土复合结构的各种实际应用中用作混凝土板浇注的模板，特别是木结构建筑的修复。目前，很少有研究对带有木板夹层的木-混凝土组合梁中斜螺钉的剪切刚度进行研究。在本文中，进行了八组剪切试验，研究了带有木板夹层的木-混凝土组合梁斜螺钉的剪切刚度。关键参数包括螺钉连接器在木材中的嵌入深度、螺钉直径、混凝土板厚度和混凝土强度。如测试结果所示，随着螺钉嵌入木材的深度和螺钉直径的增加，斜螺钉的剪切刚度得到提高。在螺钉嵌入混凝土深度不变的情况下，混凝土板厚和混凝土强度对斜交叉螺钉的抗剪刚度没有显着影响。基于二维弹性地基梁理论，提出了带夹层木-混凝土组合梁斜螺钉抗剪刚度的预测计算方法。比较表明，斜螺杆的剪切刚度可以使用计算方法很好地预测。混凝土板的厚度和混凝土强度对斜交叉螺钉的剪切刚度没有显着影响。基于二维弹性地基梁理论，提出了带夹层木-混凝土组合梁斜螺钉抗剪刚度的预测计算方法。比较表明，斜螺杆的剪切刚度可以使用计算方法很好地预测。混凝土板的厚度和混凝土强度对斜交叉螺钉的剪切刚度没有显着影响。基于二维弹性地基梁理论，提出了带夹层木-混凝土组合梁斜螺钉抗剪刚度的预测计算方法。比较表明，斜螺杆的剪切刚度可以使用计算方法很好地预测。