意杨旋切板胶合木销槽承压强度的试验研究

Experimental Study on Bearing Strength of Pin Groove of the Poplar LVL

摘要: 意杨旋切板胶合木(简称意杨LVL)是一种新型工程木，具有出材率高、强度高、变异性小、尺寸不受限制等优点，但该工程木在土建领域的应用却较少。因此，对影响意杨LVL螺栓连接性能的销槽承压性能进行试验研究，以期探索扩展意杨LVL在建筑工程中的应用。共设计制作了3组尺寸为90 mm × 90 mm × 40 mm的半孔承压试件，每组10个，测试螺杆直径为8 mm、10 mm、12 mm时试件的销槽承压强度。试验发现，破坏时销槽孔壁均发生局部压溃皱褶；试件半孔下方受拉裂缝随螺杆直径增大而变大；螺杆直径越小，抗压强度越大。最后对销槽承压强度进行了理论计算，得出中国及美国规范的销槽承压强度计算结果与试验值吻合最好。

Abstract: Poplar Laminated Veneer Lumber (Poplar LVL) is a new type of Engineering timber, which has the advantages of high outturn percentage, high strength, small variability and unrestricted size, but it is seldom used in the field of civil engineering. Therefore, in order to explore and expand the application of Poplar LVL in construction engineering, the pressure bearing performance of pin groove which affects the performance of Poplar LVL bolt connection was studied. Three groups of 90 mm × 90 mm × 40 mm half hole pressure bearing specimens with 10 in each group were designed and manufactured. The pin groove bearing strength of the specimens was tested when the screw diameter was 8 mm, 10 mm and 12 mm. It is found that the pin slot hole wall has local collapse and wrinkle when the specimen is damaged; the tensile crack under the half hole increases with the increase of screw diameter; the smaller the screw diameter, the greater the compressive strength. Finally, the bearing strength of pin groove is calculated theoretically, and it is concluded that the calculated results of pin groove bearing strength in Chinese and American codes are in good agreement with the experimental values.