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navanvliet 54b01a2816 basics concrete reinforcement added
2024-03-22 18:47:46 +01:00

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"# Reinforcement\n",
"\n",
"## Reinforcement areas for beams and columns\n",
"\n",
"|Diameter $\\phi$ [mm] |$A_s$ [mm^2] ||||||||||\n",
"|---|------|------|------|------|------|------|------|------|------|------|\n",
"| | 1 bar | 2 bars | 3 bars | 4 bars | 5 bars | 6 bars | 7 bars | 8 bars | 9 bars | 10 bars |\n",
"| 6 | 28 | 57 | 85 | 113 | 141 | 170 | 198 | 226 | 254 | 283 |\n",
"| 8 | 50 | 101 | 151 | 201 | 251 | 302 | 352 | 402 | 452 | 503 |\n",
"| 10| 79 | 157 | 236 | 314 | 393 | 471 | 550 | 628 | 707 | 785 |\n",
"| 12| 113 | 226 | 339 | 452 | 565 | 679 | 792 | 905 | 1018 | 1131 |\n",
"| 16| 201 | 402 | 603 | 804 | 1005 | 1206 | 1407 | 1608 | 1810 | 2011 |\n",
"| 20| 314 | 628 | 942 | 1257 | 1571 | 1885 | 2199 | 2513 | 2827 | 3142 |\n",
"| 25| 491 | 982 | 1473 | 1963 | 2454 | 2945 | 3436 | 3927 | 4418 | 4909 |\n",
"| 32| 804 | 1608 | 2413 | 3217 | 4021 | 4825 | 5630 | 6434 | 7238 | 8042 |\n",
"\n",
"\n",
"## Reinforcement in nets for slabs\n",
"| Spacing (c.t.c.) [m] | Bars/length [1/m]| Total area per meter width [mm²/m]|||||||\n",
"|-----------------------|------------|--------------------------------------|---|---|---|---|---|---|\n",
"| | | $\\phi = 6 [mm]$ | $\\phi = 8 [mm]$ | $\\phi = 10 [mm]$ | $\\phi = 12 [mm]$ | $\\phi = 16 [mm]$ | $\\phi = 20 [mm]$ | $\\phi = 25 [mm]$ |\n",
"| 70 | 14.29 | 404 | 718 | 1122 | 1616 | 2873 | 4489 | 7015 |\n",
"| 75 | 13.33 | 377 | 670 | 1047 | 1508 | 2680 | 4188 | 6543 |\n",
"| 80 | 12.50 | 353 | 628 | 982 | 1414 | 2513 | 3927 | 6136 |\n",
"| 85 | 11.76 | 333 | 591 | 924 | 1330 | 2365 | 3695 | 5773 |\n",
"| 90 | 11.11 | 314 | 558 | 873 | 1257 | 2234 | 3490 | 5454 |\n",
"| 95 | 10.53 | 298 | 529 | 827 | 1191 | 2117 | 3308 | 5169 |\n",
"| 100 | 10.00 | 283 | 503 | 785 | 1131 | 2011 | 3142 | 4909 |\n",
"| 105 | 9.52 | 269 | 479 | 748 | 1077 | 1914 | 2991 | 4673 |\n",
"| 110 | 9.09 | 257 | 457 | 714 | 1028 | 1828 | 2856 | 4462 |\n",
"| 115 | 8.70 | 246 | 437 | 683 | 984 | 1749 | 2733 | 4271 |\n",
"| 120 | 8.33 | 236 | 419 | 654 | 942 | 1675 | 2617 | 4089 |\n",
"| 125 | 8.00 | 226 | 402 | 628 | 905 | 1609 | 2513 | 3927 |\n",
"| 130 | 7.69 | 217 | 387 | 604 | 870 | 1546 | 2416 | 3775 |\n",
"| 135 | 7.41 | 210 | 373 | 582 | 838 | 1490 | 2328 | 3637 |\n",
"| 140 | 7.14 | 202 | 359 | 561 | 808 | 1436 | 2243 | 3505 |\n",
"| 145 | 6.90 | 195 | 347 | 542 | 780 | 1387 | 2168 | 3387 |\n",
"| 150 | 6.67 | 189 | 335 | 524 | 754 | 1341 | 2095 | 3274 |\n",
"| 155 | 6.45 | 182 | 324 | 507 | 730 | 1297 | 2026 | 3166 |\n",
"| 160 | 6.25 | 177 | 314 | 491 | 707 | 1257 | 1964 | 3068 |\n",
"| 165 | 6.06 | 171 | 305 | 476 | 685 | 1218 | 1904 | 2975 |\n",
"| 170 | 5.88 | 166 | 296 | 462 | 665 | 1182 | 1847 | 2886 |\n",
"| 175 | 5.71 | 161 | 287 | 449 | 646 | 1148 | 1794 | 2803 |\n",
"| 180 | 5.56 | 157 | 280 | 437 | 629 | 1118 | 1747 | 2729 |\n",
"| 185 | 5.41 | 153 | 272 | 425 | 612 | 1088 | 1700 | 2656 |\n",
"| 190 | 5.26 | 149 | 264 | 413 | 595 | 1058 | 1653 | 2582 |\n",
"| 195 | 5.13 | 145 | 258 | 403 | 580 | 1031 | 1612 | 2518 |\n",
"| 200 | 5.00 | 141 | 251 | 393 | 566 | 1005 | 1571 | 2454 |\n",
"| 250 | 4.00 | 113 | 201 | 314 | 452 | 804 | 1257 | 1964 |\n",
"\n",
"\n",
"`````{Note}\n",
"In concrete plates (floors and walls) the reinforcement is usually specified as the the type of bar and the spacing (Ø12-200) rather than the number of bars per meter (5 Ø12)\n",
"`````\n",
"\n",
"## Lab splice length\n",
"\n",
"```{figure} Images/reinforcement_lap_splice_length.png\n",
"---\n",
"align: right\n",
"---\n",
"```\n",
"\n",
"In some cases the reinforcement bars need to be coupled because of the limited lengths of the bars or to ease execution. This is done by placing two bars relatively close to each other for a certain lap length. The forces are transmitted by shear and compressive stresses in the concrete. For a first design the lap length can be estimated as: \n",
"\n",
"40 x Ø (diameter smallest bar)\n",
"\n",
"For exact calculations, see EC2\n",
"\n",
"## Cover\n",
"\n",
"| Structural Element | Cover c [mm] per environment | | | Increase [mm] | |\n",
"|--------------------|--------------|---------------|-----------------------|---------------------------|-------------------|\n",
"||dry|wet|salt or aggresive|modified surface|uninspected table surface|\n",
"| Plaat en wand | 15 | 25 | 30 | +5 | +5 |\n",
"| Balk, poer en console | 25 | 30 | 35 | +5 | +5 |\n",
"| Kolom | 30 | 35 | 40 | +5 | +5 |\n",
"\n",
"```{figure} Images/reinforcement_cover.png\n",
"---\n",
"align: right\n",
"---\n",
"```\n",
"`````{Note}\n",
"Further demands: \n",
"c ≥ Ø (for bars ≤ Ø 25 mm) \n",
"c ≥ 1,5Ø (for bars > Ø 25 mm) \n",
"prestressing steel: + 5 mm\n",
"`````\n",
"\n",
"Under certain conditions it is allowed to bundle 2 of three bars together without spacing. These bundles can be regarded as a single bar with the same cross section (mm2\n",
") as the total bundle.\n",
"\n",
"## Minimal bar distances\n",
"```{figure} Images/reinforcement_minimal_bar_distances.png\n",
"---\n",
"align: right\n",
"---\n",
"```\n",
"\n",
"The spacing between (not c.t.c distance) the bars should be not less than the maximum of:\n",
"- the bar diameter\n",
"- the maximum aggregate size + 5 mm\n",
"- 20 mm\n",
"\n",
"When bars are placed in separate layers, care must be taken that good compaction of the concrete must be possible. In the case of walls there must be enough room to cast concrete in the lower regions of the wall. At laps the distances between the bars may be smaller.\n",
"\n"
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