可降解竹竿土钉连接点抗弯性能研究

Study on Bending Behavior of Connection Points of Biodegradable Bamboo Pole SoilNails

随着绿色建筑理念的推广,竹材作为一种可降解的绿色建筑材料受到了业内研究人员的广泛关注。当竹竿被用作土钉时,竹竿杆节间的连接形式是影响竹竿土钉结构性能的关键。因此,设计出一种竹竿土钉杆节的连接形式,并结合“四点”抗弯试验对竹竿和竹竿连接点的抗弯性能进行研究,总结了竹竿连接点发生抗弯破坏的模式与形成原因。研究结果表明:竹竿和竹竿连接点受弯时破坏荷载分别为25.79、41.78 kN,竹竿连接点的抗弯性能优于竹竿;竹竿的初始破坏位置在2个加载点中间,竹竿连接点的初始破坏位置在连接点外,未造成连接点的破坏,进一步验证了连接点的整体性与良好的力学性能,表明竹竿连接点的结构设计安全可靠。该研究成果可为后续竹竿土钉在实际工程中的应用提供试验依据。

With the promotion of green building concepts,bamboo has received widespread attention from industry researchers as biodegradable green building materials.When bamboo poles are used as soil nails,the connection form between bamboo pole segments is the key factor affecting the structural performance.Therefore,a connection form of bamboo pole soil nail was designed.The bending behavior of bamboo pole and bamboo pole connection points was studied by four point bending test and the bending failure mode and formation reasons were summarized.The research results show that the failure loads of the connection points were 25.79 kN and 41.78 kN respectively,and the bending behavior of the points was better than that of bamboo poles.The initial failure position of the bamboo pole was between the two loading points,and the initial failure position of the bamboo pole connection point was outside the connection point,which did not cause any damage to the connection point.The integrity and good mechanical properties of the connection point were further verified,indicating that the structural design of the point is safe and reliable.This research result can provide experimental basis for the application of bamboo pole soil nails in practical engineering in the future.