格宾网筋材的绞边强度特性试验研究

为研究不同绞边方式及不同网孔尺寸下格宾网的绞边拉伸特性，参考欧洲标准(EN10223-3:1997)，采用自行设计的绞边试验装置，对网孔型号为60 mm×80 mm和80 mm×100 mm的A与B两类绞边方式的格宾网片进行绞边拉伸试验，分析比较各自的力学特性，并讨论绞边拉伸破坏的典型破坏模式. 研究结果表明：与B类绞边方式相比，A类绞边方式的格宾网片绞边拉伸强度较大；根据格宾网的破坏形态，绞边拉伸破坏可分为3种典型破坏模式，即绞边钢丝被拉出破坏、网丝的拉断破坏以及绞边钢丝部分被拉出后网丝被拉断破坏；绞边质量与绞合在端丝上的钢丝缠绕圈数、紧密程度有关；网孔尺寸、钢丝直径及绞边质量均是影响格宾网的绞边拉伸力学特性的重要因素. 研究结果可为加筋格宾结构物的设计、施工提供参考.
In order to study the tensile mechanical behaviors of selvages in gabion meshes with different mesh sizes and selvage ways, a selvage stretching device was designed according to European Standard(EN10223-3:1997). Selvage tensile tests were carried out on the gabion meshes of 60 mm×80 mm and 80 mm×100 mm with type-A and type-B selvage ways. The mechanical behaviors of gabion meshes were analyzed, and the typical failure mode of the selvage tension was discussed. The test results showed that the selvage tensile strength of the gabion mesh with type-A selvage way was greater than that of type-B. According to the damage mode of gabion mesh, selvage tensile failure was classified into three failure modes: pull-out failure of the wire wound on the edge wire, tensile failure of mesh wire and tensile failure of mesh wire after pulling out of some enwinding wires. It is also found that selvage quality was dependent on the winding turns and compact degree of the wire wound on the edge wire. Selvage tensile mechanical characteristics of the gabion mesh were significantly affected by the mesh size, wire size, and selvage quality. This study is expected to provide some useful references for the design and construction of reinforced gabion structures.