1.1 这些试验方法涵盖了用粘土或混凝土砌块建造的现有无钢筋实心砌块和未铺设空心砌块砌体的平均现场砂浆接缝抗剪强度指数的测定程序。提供了三种方法: 1.1.1 方法A（使用平板千斤顶控制法向压缩应力）- 当试验期间使用试验方法中所述的平千斤顶方法控制试验现场的正常抗压应力状态时，用于确定砂浆接缝的抗剪强度指数 C1197 . 在整个试验过程中，监测试验装置的水平位移。方法A的测试设置如所示 图1 . 1.2 以英寸-磅为单位的数值应视为标准值。 括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 ====意义和用途====== 5.1 通过本试验方法获得的砌体砂浆接缝抗剪强度指数可以通过参考规范和标准中包含的关系与砌体墙抗剪强度相关。例如，国际现行建筑规范A1章包含了一个将剪切指数与墙体抗剪强度相关的公式，而ASCE/SEI 41第11章中可以找到一个稍有不同的公式。 本标准的使用者应注意，这些抗剪强度关系通常是基于20世纪早期无钢筋砖砌体试验的经验关系。这些关系通常假设墙体抗剪强度受砂浆接缝的剪切力限制，而不是通过单元的剪切力。 5.2 对于空心未铺砌或实心砌块砌体结构，仅对垂直靠近被测砌块的砂浆层接缝测量抗剪强度指数。当测试空心未铺砌砌体结构时，抗剪强度指数基于砂浆和测试单元之间的水平界面以及测试单元上方和下方的砌体。 在多夹层结构的情况下，测得的砂浆接缝抗剪强度指数仅适用于测试单元所在的夹层；试验装置正上方或正下方不得有集管。忽略任何现有环缝砂浆对测量的抗剪强度指数的贡献，这可能导致高估抗剪强度指数（见 注1 ). 注1: 参考本试验方法的一些文件，包括ASCE/SEI 41，包括一个折减系数，以说明填充环接头对测量剪切强度指数的贡献。 5.3 方法A中列出的试验程序可作为试验方法的扩展 C1197 . 根据试验方法进行的双千斤顶试验 C1197 ，提供了方法A所需测试设置的一半。在C1197和C1531方法A测试完成时，人们将知道测试时砌体的变形性以及预期接缝抗剪强度指数和正常抗压应力之间的关系。

1.1 These test methods cover procedures for the determination of the average in situ mortar joint shear strength index in existing unreinforced solid-unit and ungrouted hollow-unit masonry built with clay or concrete units. Three methods are provided: 1.1.1 Method A (with Flatjacks Controlling Normal Compressive Stress)— For determining mortar joint shear strength index when the state of normal compressive stress at the test site is controlled during the test using the flatjack method described in Test Method C1197 . Horizontal displacement of the test unit is monitored throughout the test. The test setup for Method A is shown in Fig. 1 . 1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.3 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 and health practices and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== 5.1 The masonry mortar joint shear strength index obtained by this test method can be related to the masonry wall shear strength by relationships contained in referenced Codes and Standards. For example, Chapter A1 of the International Existing Building Code contains a formula relating shear index to wall shear strength, while a slightly different formula can be found in Chapter 11 of ASCE/SEI 41. The user of this standard is cautioned that these shear strength relationships are typically empirical relationships based on tests of early 20th-century unreinforced brick masonry. These relationships typically assume that wall shear strength is limited by shear of the mortar joints rather than shear through the units. 5.2 For hollow ungrouted or solid unit masonry construction the shear strength index is measured only for the mortar bed joints vertically adjacent to the unit being tested. When testing hollow ungrouted masonry construction, the shear strength index is based on the horizontal interface between the mortar and the test unit and the masonry above and below the test unit. In the case of multi-wythe construction, the measured mortar joint shear strength index is applicable only to the wythe in which the test unit is located; no headers shall exist immediately above or below the test unit. The contribution of any existing collar joint mortar to the measured shear strength index is neglected, and this may lead to an overestimate of the shear strength index (see Note 1 ). Note 1: Some documents that reference this test method, including ASCE/SEI 41, include a reduction factor to account for the contribution of a filled collar joint to the measured shear strength index. 5.3 The test procedure listed for Method A may be conducted as an extension of Test Method C1197 . The two-flatjack test, conducted in accordance with Test Method C1197 , provides half of the required test setup for Method A. At the completion of both the C1197 and the C1531 Method A test, one would know the deformability of the masonry at the test and the relationship between the expected joint shear strength index and the normal compressive stress.