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首页> 外文期刊>International Journal of Information Technology >Study on the Impact of Size and Position of the Shear Field in Determining the Shear Modulus of Glulam Beam Using Photogrammetry Approach
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Study on the Impact of Size and Position of the Shear Field in Determining the Shear Modulus of Glulam Beam Using Photogrammetry Approach

机译：照相法测定剪切场大小和位置对确定胶合木梁剪切模量的影响

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The shear modulus of a timber beam can be determined using torsion test or shear field test method. The shear field test method is based on shear distortion measurement of the beam at the zone with the constant transverse load in the standardized four-point bending test. The current code of practice advises using two metallic arms act as an instrument to measure the diagonal displacement of the constructing square. The size and the position of the constructing square might influence the shear modulus determination. This study aimed to investigate the size and the position effect of the square in the shear field test method. A binocular stereo vision system has been employed to determine the 3D displacement of a grid of target points. Six glue laminated beams were produced and tested. Analysis of Variance (ANOVA) was performed on the acquired data to evaluate the significance of the size effect and the position effect of the square. The results have shown that the size of the square has a noticeable influence on the value of shear modulus, while, the position of the square within the area with the constant shear force does not affect the measured mean shear modulus.
机译：木梁的剪切模量可以使用扭转试验或剪切场试验方法确定。剪切场测试方法基于标准化四点弯曲测试中具有恒定横向载荷的区域梁的剪切变形测量。当前的操作规范建议使用两个金属臂作为测量建筑广场对角线位移的工具。构造正方形的大小和位置可能会影响剪切模量的确定。这项研究旨在研究剪切场测试方法中正方形的大小和位置效应。已经使用双目立体视觉系统来确定目标点网格的3D位移。产生并测试了六个胶合层压梁。对获得的数据进行方差分析（ANOVA），以评估尺寸效应的重要性和正方形的位置效应。结果表明，正方形的大小对剪切模量的值有显着影响，而正方形在具有恒定剪切力的区域内的位置不会影响测得的平均剪切模量。

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