Evgenii Sharapov, Aleksandr Korolev, Sergei Shlychkov, Nilson Tadeu Mascia
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引用次数: 0
摘要
钻孔阻力(DR)测量是评估木材特性和内部条件的常用方法。一般来说,钻孔阻力测量用于监测和评估木材结构的健康状况。本研究旨在评估钻孔阻力测量后留下的 3 毫米孔洞对弯曲和压缩条件下测试的木材试样的残余破坏荷载的影响。实验室测试使用不同截面的无缺陷苏格兰松木(Pinus sylvestris L.)试样。使用 IML-RESI PD 400 工具和新型标准铲形钻头(IML System GmbH,德国威斯洛赫)在横截面的不同位置钻孔。我们使用有限元建模软件模拟钻孔试样的弯曲情况,并评估实验数据的准确性。在木材评估中,针对载荷变形曲线的非线性,我们使用了正交各向同性体模型。试样中孔的存在和位置对静态弯曲的破坏载荷有显著影响。不过,这种影响在不同截面上有所不同。建议在木构件未暴露于最大拉伸应力的区域使用 DR 对结构木材进行评估。DR 测量后的孔洞对压缩残余破坏载荷的影响与木材截面损失成正比,对于结构尺寸的木结构而言影响较小。
Effect of drilling resistance measurement on residual load capacity of Scots pine (Pinus sylvestris L.)
Drilling resistance (DR) measurements constitute a common method to evaluate the properties and internal conditions of wood. Generally, DR is used to monitor and assess the structural health of timber constructions. This study aimed at evaluating the influence of 3-mm holes left after drilling resistance measurements on the residual failure load of the wood specimens tested under the bending and compression conditions. Laboratory tests were performed using defect-free conditioned specimens of Scots pine (Pinus sylvestris L.) with various cross-sections. Drilling holes were made with an IML-RESI PD 400 tool and a new standard spade drill bit (IML System GmbH, Wiesloch, Germany) in different locations of the cross-section. We used a finite element modelling software to simulate the bending of drilled specimens and assess the accuracy of experimental data. For wood assessment, an orthotropic body model was used with regard to the non-linearity of the load deflection curve. The failure load in static bending was significantly influenced by the presence and location of holes in the specimens. However, this effect varied across the different cross-sections. It is recommended to use DR for the evaluation of structural timber in the areas of wood elements that are not exposed to the maximum tensile stresses. The influence of holes after DR measurements on residual failure load in compression was proportional to the wood cross-section loss and is minor for structural-sized wood constructions.
期刊介绍:
European Journal of Wood and Wood Products reports on original research and new developments in the field of wood and wood products and their biological, chemical, physical as well as mechanical and technological properties, processes and uses. Subjects range from roundwood to wood based products, composite materials and structural applications, with related jointing techniques. Moreover, it deals with wood as a chemical raw material, source of energy as well as with inter-disciplinary aspects of environmental assessment and international markets.
European Journal of Wood and Wood Products aims at promoting international scientific communication and transfer of new technologies from research into practice.