如题所示，对于检测新手或不熟悉钢筋拉伸试验的朋友，经常会对钢筋拉伸试件取样长度产生异议，现就此问题简单说明。Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ
钢筋拉伸试验试样长度由三部分组成，即：原始标距L0+2倍原始标距至夹头距离L1+2倍夹持长度L2Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ
其中：Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ
原始标距：GB/T228.1中规定原始标距L0=k
（此处k值取5.65，为例），即5.01d；Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ原始标距至夹头距离：GB/T228.1中D.2.2中规定“……试样原始标距的标记与最接近夹头的距离不小于
，即0.89d。Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ夹持长度：一般万能试验机夹头长度约为120mm，有效夹持长度至少约为100mm。Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ
Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ
所以拉伸试样最短取样长度为：5.01d+0.89d+0.89d+100+100＝6.79d≈7d+200。列表如下：Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ
Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ
d(mm)Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 6Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 8Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 10Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 12Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 14Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 16Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 18Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 20Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 22Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 25Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 28Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 32Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ |
L0+2L1(mm)Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 42Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 56Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 70Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 84Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 98Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 112Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 126Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 140Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 154Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 175Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 196Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 224Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ |
最小长度(mm)Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 242Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 256Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 270Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 284Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 298Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 312Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 326Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 340Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 354Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 375Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 396Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ | 424Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ |
综上所述，直径20mm以下钢筋取样长度400mm，直径22mm至32mm取样长度500mm完全满足规范要求。Tðl"Çr¶"çbbs.3c3t.comâbFÞ[ AÓÈ