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关于钢筋拉伸试验钢筋取样长度的问题 [复制链接]

lcm0312
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天道酬勤

  • 高级工程师
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  • 2006-07-31
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发表于 2013-08-05 11:04 |显示全部
大家都清楚钢筋试验在工程中是最基础最广泛的试验检测项目之一，其意义重要程度是不言而喻的。本贴致那些刚刚步入钢筋试验领域的新手们！F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s
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。F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s
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L2F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s
其中：F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s
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；F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s
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。F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s
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。F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s
F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s
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：F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s
F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

d(mm)F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

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6F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

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8F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

10F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

12F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

14F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

16F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

18F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

20F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

22F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

25F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

28F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

32F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

L0+2L1(mm)F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

42F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

56F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

70F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

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84F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

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98F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

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112F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

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126F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

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140F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

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154F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

175F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

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196F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

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224F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

最小长度(mm)F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

242F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

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256F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

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270F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

284F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

298F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

312F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

326F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

340F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

354F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

375F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

396F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

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424F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s

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F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s
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。F¶¨‡ ]Ï}ëbbs.3c3t.comþ¿Û}R(µ s
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