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Concreto armado 93<br />

N.·<br />

Ma<strong>de</strong>ira<br />

Tabela 4.2 Características do pinho e da peroba<br />

Ruptura<br />

Módu[o <strong>de</strong> elasticida<strong>de</strong><br />

kgf/cm 2 Ekg J /cm 2 Peso<br />

Flexão Compressão Flexão Compressão específico<br />

43 990 440 146000 90000 0,87<br />

44 962 429 109000 91 100 0,82<br />

45 Peroba- 878 461 118700 90500 0,80<br />

46 -Rosa 912 439 112900 100000 0,79<br />

47 883 430 105000 91600 0,77<br />

48 767 343 126500 92 700 0,66<br />

Média 898 423 119683 94150 0,78<br />

134 530 240 142000 100400 0,52<br />

135 Pinho-do- 599 268 131300 103700 0,54<br />

136 -Panwá 582 244 137700 107600 0,54<br />

137 620 275 142500 109200 0,56<br />

Média 582 256 138700 105225 0,54<br />

Nota. Nos cálculos das peças (2." Parte) adotou-se E = 100000 kgf/cm 2<br />

Tabela 4.3 Lajes - Carga (g/m 2 )<br />

Espessura 7cm 8cm 9cm 10 cm 11cm 12cm<br />

Concreto 168 192 216 240 264 288<br />

Sobrecarga 100 100 100 100 100 100<br />

Fôrmas 20 20 20 20 20 20<br />

Total, kg/m 2 288 312 366 360 384 408<br />

Tabela 4.4 Valores <strong>de</strong> J, We M para as seções u<strong>sua</strong>is<br />

Peças<br />

Dimensões<br />

J<br />

W<br />

M=aW kgf/cm<br />

bh 3 /12 bh 2 /6<br />

max. mino max. mino max. mino max. mino max. mino<br />

Pinho em em a em 3 a = 60 kgf/em' a = 70 kgf/em 2 a= 80 kgf/em 2<br />

Sarrafos 2,5 x 10,0 208,3 13,0 41,7 10,4 2500 625 2920 730 3330 830<br />

Sarrafos 2,5 x 15,0 703,1 19,5 93,7 15,6 5625 936 6560 1090 7500 1250<br />

Tábuas 2,5 x 30,0 5625,0 39,0 375,0 31,2 22500 1870 26250 2190 30000 2500<br />

Caibros 7,5 x 7,5 263,7 263,7 70,3 70,3 4220 4220 4920 4920 5625 5625<br />

Caibros 7,5 x 10,0 625,0 351,6 125,0 93,7 7500 5620 8750 6560 10000 7500<br />

Peroba a = 100 kgf/em 2 a = 110 kgf/em 2 a = 120 kgf/em 2<br />

Caibros 5,0 x 6,0 90,0 62,5 30,0 25,0 3000 2500 3300 2750 3600 3000<br />

Caibros 5,0 x 7,0 142,9 72,9 40,8 29,2 4080 2920 4490 3210 4900 3505<br />

Vigas 6,0 x 12,0 864,0 216,0 144,0 72,0 14400 7200 15840 7920 17280 8640<br />

Vigas 6,0 x 16,0 2018,0 288,0 256,0 96,0 23600 9600 28160 10560 30720 11520

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