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Perhitungan plat tangga
Contoh hasil analisa dari ETABS didapat :
Pada pelat tangga :
M11 = -311,6979 Kgm = -3116979 Nmm
M22 = -1582,6438 Kgm = -15826438 Nmm
Pada bordes :
M11 = -879,6493 Kgm = -8796493 Nmm
M22 = 1863,7989 Kgm = 18637989 Nmm
ebal pelat t = 15 !m = 15" mm
PADA PELAT TANGGA ARAH 1-1
d = 15" -25 = 125 mm
#s = 86,58 mm2
#s m$n = ",""2" % b % d = ",""2" % 1""" % 125 = 25"
mm2
25" mm2 & 86,58 mm2
Ma'a #s perl( = 25" mm2
Pa'a$ t(langan d$ameter 8 mm
# = ) % * % d2 = ) % * % 82 = 5",265 mm2
# = 5",265 % 5 = 253,125 mm2
+ara' t(langan 1"""5 = 2"" mm ma'a 8-2"" mm
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a = 4,765
Mn = % #s % ./ % 0d-a2 = ",8 % 253,125 % 4"" % 0125-04,7652
= 9932"17,5 Nmm
Mn & M(
9932"17,5 Nmm & 3116979 Nmm 0K
Ma'a d$pa'a$ t(langan pembag$ 8-2"" 0ara pende'
ARAH 2-2
d = 15" -25 = 125 mm
#s = 439,62 mm2
#s m$n = ",""2" % b % d = ",""2" % 25"" % 125 =
625 mm2 625 mm2 & 439,62 mm2
Ma'a #s perl( = 625 mm2
Pa'a$ t(langan d$ameter 8 mm
# = ) % * % d2 = ) % * % 82 = 5",265 mm2
# = 5",265 % 13 = 653,445 mm2
+ara' t(langan 25""13 = 192 mm ma'a 8-192 mm
a = 4,92"
Mn = % #s % ./ % 0d-a2 = ",8 % 653,445% 4"" % 0125-04,92"2
= 256234"8,1 Nmm
Mn & M(
256234"8,1 Nmm & 15826438 Nmm 0K
Ma'a d$pa'a$ t(langan pembag$ 8-192 0ara panang
PADA PELAT BORDESARAH 1-1
d = 15" -25 = 125 mm #s = 244,347 mm2
#s m$n = ",""2" % b % d = ",""2" % 1""" % 125 = 25" mm2
25" mm2 & 244,347 mm2
Ma'a #s perl( = 25" mm2
Pa'a$ t(langan d$ameter 8 mm
# = ) % * % d2 = ) % * % 82 = 5",265 mm2
# = 5",265 % 5 = 253,125 mm2
+ara' t(langan 1"""5 = 2"" mm ma'a 8-2"" mm
a = 4,765
Mn = % #s % ./ % 0d-a2 = ",8 % 253,125% 4"" % 0125-04,7652
= 9932"17,5 Nmm
Mn & M(9932"17,5 1 Nmm & 8796493 Nmm 0K
Ma'a d$pa'a$ t(langan pembag$ 8-2"" 0ara pende'
ARAH 2-2
d = 15" -25 = 125 mm
#s = 517,722 mm2
#s m$n = ",""2" % b % d = ",""2" % 1""" % 125 = 25"
mm2
517,722 mm2 & 25" mm2
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Ma'a #s perl( = 517,722 mm2
Pa'a$ t(langan d$ameter 8 mm
# = ) % * % d2 = ) % * % 82 = 5",265 mm2
# = 5",265 % 11 = 552,915 mm2
+ara' t(langan 1"""11 = 9",9"9 mm 9" mm ma'a 8-9" mm
a = 1",4"8Mn = % #s % ./ % 0d-a2 = ",8 % 552,915% 4"" %
0125-01",4"82
= 21195841,71 Nmm
Mn & M( 21195841,71 Nmm & 18637989 Nmm
Ma'a d$pa'a$ t(langan pembag$ 8-9" 0ara panang
