1.1 这些试验方法确定了与平行于面板边缘平面的平面的剪切变形相关的结构面板的剪切特性。剪切强度和刚度模量都可以确定。试验主要测量面板平面内形成的平面剪切（滚动剪切）强度。 1.2 使用的结构板包括但不限于结构胶合板、定向刨花板（OSB）以及单板和人造层的复合材料。 1.3 包括两种测试方法: 1.3.1 试验方法A-- 板加载的平面剪切。 1.3.2 试验方法B-- 五点弯曲引起的平面剪切。 1.3.3 方法的选择将取决于测试的目的和可用的设备。 1.3.4 试验方法A，平板加载的平面剪切-- 该试验方法使用粘附在具有突出刀刃的钢板之间的矩形面板截面，以在面板表面产生载荷。该试验方法已用于开发胶合板和定向刨花板的剪切性能，以确定设计值。该试验方法不会产生纯剪切，但规定了试样长度，以使二次应力的影响最小。该方法确定剪切强度和刚度模量。 1.3.5 试验方法B，五点弯曲引起的平面剪切-- 在使用两个连续跨度进行弯曲加载时，面板上会产生平面剪切应力。 该试验方法确定了在横向荷载作用下与面板应用一致的平面剪切强度。该试验方法能够测定任何水分条件下的剪切强度。 1.4 以英寸磅为单位的数值应视为标准。当括号中给出数值时，这些数值是对国际单位制的数学转换，仅供参考，不被视为标准。 1.5 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 3.1 通过这些试验方法确定的结构板的平面剪切（滚动剪切）特性对于各种胶合木板结构构件的严格设计至关重要，如箱梁、折叠板屋顶和受力蒙皮板。平面剪切也可以控制低跨度的设计- 承受高集中荷载的地板、高浇筑压力下的混凝土模板和散装储存结构中遇到的深度比。 3.2 根据试验方法A确定的刚度模量是作为一个单元的整个试样的复合材料。对于具有平行于和垂直于剪切力取向的晶粒的层的剪切模量之间的比率已知的胶合板面板，可以计算垂直层的滚动剪切模量。 3.3 通过切片或旋转剥离生产的单板可能包含平行于单板刀侧纹理的精细花纹或分离，这些花纹或分离是在刀被迫穿过木材时产生的。 这些检查被称为“刀式检查”，以将其与压杆处的力可能在单板的另一侧形成的偶尔检查以及干燥引起的检查区分开来。刀具检查可能对胶合板面板的滚动剪切性能产生重大影响，对其他含单板面板也可能具有重要意义。试验方法A要求（如适用）对匹配试样进行试验，该试样应尽可能具有开启和关闭方向的刀形止回阀（见 图1 ). 3.4 为了控制或定义影响轧制剪切的其他变量，这些试验方法需要测定水分含量、比重和经过的时间- 失败。建议在受控大气中对试验材料进行调节，确定刀具检查的深度（如适用），以及确定木材和胶合板胶合线失效的百分比（如适用。

1.1 These test methods determine the shear properties of structural panels associated with shear distortion of the planes parallel to the edge planes of the panels. Both shear strength and modulus of rigidity may be determined. Primarily, the tests measure the planar shear (rolling shear) strength developed in the plane of the panel. 1.2 Structural panels in use include, but are not limited to, structural plywood, oriented strand board (OSB), and composites of veneer and of wood-based layers. 1.3 Two test methods are included: 1.3.1 Test Method A— Planar shear loaded by plates. 1.3.2 Test Method B— Planar shear induced by five-point bending. 1.3.3 The choice of method will be dictated by the purpose of the test and equipment available. 1.3.4 Test Method A, Planar Shear Loaded by Plates— This test method uses a rectangular panel section adhered between steel plates with protruding knife edges to create load at the panel faces. This test method has been used to develop shear properties of plywood and oriented strand board for the purpose of confirming design values. This test method does not produce pure shear, but the specimen length is prescribed so that the secondary stresses have a minimum effect. The method determines shear strength and modulus of rigidity. 1.3.5 Test Method B, Planar Shear Induced by Five-Point Bending— Planar shear stress is induced on the panel while loaded in bending using two continuous spans. This test method determines planar shear strength consistent with panel applications under transverse loading. This test method is able to determine shear strength at any moisture condition. 1.4 The values stated in inch-pound units are to be regarded as standard. When there are values given in parentheses, these are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 3.1 Planar shear (rolling shear) characteristics of structural panels determined by these test methods are essential for the rigorous design of various glued wood-panel structural components, such as box beams, folded plate roofs, and stressed skin panels. Planar shear also may govern the design at low span-depth ratios encountered in floors subjected to high concentrated loads, concrete forms at high pouring pressures, and bulk storage structures. 3.2 The modulus of rigidity determined from Test Method A is a composite of the entire specimen acting as a unit. For plywood panels for which the ratio between the shear moduli of the plies with grain oriented parallel and perpendicular to the shear forces is known, the rolling shear modulus of the perpendicular plies can be calculated. 3.3 Veneer produced by slicing or rotary peeling may contain fine checks or separations parallel to the grain on the knife side of the veneer that are produced as the knife is forced through the wood. These checks are termed “knife checks” to distinguish them from occasional checks that may be formed on the opposite side of the veneer by forces at the compression bar, and from checks caused by drying. Knife checks can have a significant effect on rolling shear properties in plywood panels and may be of significance in other veneer containing panels. Test Method A requires (when applicable) the testing of matching specimens having knife checks oriented both open and closed wherever possible (see Fig. 1 ). 3.4 To control or define other variables influencing rolling shear, these test methods require determination of moisture content, specific gravity, and elapsed time-to-failure. Conditioning of test material in controlled atmospheres, determination of depth of knife checks (when applicable), and determination of percent of wood and plywood glueline failure (when applicable) are recommended.