ASTM A370 高强度螺纹钢筋的拉伸和弯曲试验
很多标准都规定了螺纹钢筋的试验方法，如 ASTM A370, ASTM A615, ASTM A996, BS4449 和 EN-10002-1。这些标准所描述的力学试验，能满足操作者和试验设备的要求。所以，在试验大尺寸的螺纹钢筋时 -14 号螺纹钢（包括所有等级在内），我们建议使用拉伸和压缩在相同工作区域的机架型式（单一空间的试验机架），来代替老式拉伸和压缩分开工作区域的机架型式（双空间的试验机架）。对于这钟试验，我们采用 1500KN 的栽荷能力机架，它具有 1500KN (千顿）即为150吨 。并可以调节螺纹钢筋的长度，从 400（0.39in）毫米到 700（2.75in）毫米。
我们建议使用拉伸和压缩在相同工作区域的机架型式（单一空间的试验机架）来代替老式拉伸和压缩分开工作区域的机架型式这种机架的特点是顶端装有一个液压作动缸，而它的试样工作区域在试验机架的下平台上。在测试粗重的螺纹钢筋时，这就显著地降低了上下装 卸粗重螺纹钢筋的体力需求。另外。我们还能同时对钢筋进行拉伸和弯曲两种试验。只要在拉 伸夹具中，加上一个压缩的装置（转接头）。这就节省了我们换顶部夹具所需的时间，因为我们不需要用顶部的起 重机来移动这个大而重的拉伸夹具了。加压缩夹具和弯曲装置，只需要几分钟，就可以简单地拧紧螺丝了。
对于拉伸试验，我们使用液压锲形夹具，因为它初始的夹紧力可以防止螺纹钢筋因不平整而产生的打滑。这种液压契形夹具，可以适用于螺纹钢筋的直径从 毫米（0.39英寸）到 70 毫米（2.75 英寸）。夹具的齿型是 V 形的 带有槽的切口，以便抓住螺纹钢筋的筋条。最后，我们用一个自动的引伸计来测定应变。我们选用 M300 型号，它具有一个可调节的标距长度，从 10 毫米到 300 毫米（这适合于大部分螺纹钢筋的应用）。当试验开始时，它的夹指就能完全自动地夹紧钢筋的肋骨, 而放开夹指是根据程序中设定一个特定的值来控制。测量的应变则可以用来计算弹性模量和屈服点。
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