! Unit: tonne, mm, s, N, MPa
/prep7					! Pre-Processing
ET,1,BEAM188			! BEAM188 element
MP,EX,1,2e5				! Young's modulus - MPa
MP,PRXY,1,0.3  			! Poisson's ratio
MP,DENS,1,7.85e-9		! Density - tonne/mm3

! Khai bao diem hinh hoc mat trai
k,1,0,0,0
k,2,740
k,3,740,140
k,4,1180,580,0
k,5,1620,140
k,6,1620
k,7,1820
k,8,2834
k,9,4400
k,10,4909
k,11,4909,140
k,12,5349,580
k,13,5789,140
k,14,5789
k,15,5964
k,16,6987
k,17,7657,200
k,18,7657,430
k,19,7857,430
k,20,7857,1060
k,21,7857,1320
k,22,7857,1410,15.06
k,23,7857,2260,157.3
k,24,7857,2560,207.5
k,25,7657,2560,207.5
k,26,6749,2560,207.5
k,27,5964,2560,207.5
k,28,5183,2560,207.5
k,29,4400,2560,207.5
k,30,3617,2560,207.5
k,31,2834,2560,207.5
k,32,2051,2560,207.5
k,33,1180,2560,207.5
k,34,305,2560,207.5
k,35,305,2260,157.3
k,36,0,1320,0
k,37,0,860,0
k,38,-143,860,0
k,39,-143,580,0
k,40,-143,290,0
k,41,0,290,0
k,42,7657,2260,157.3		! Ngang 1
k,43,6987,2260,157.3
k,44,6749,2260,157.3
k,45,5964,2260,157.3
k,46,5183,2260,157.3
k,47,4400,2260,157.3
k,48,3617,2260,157.3
k,49,2834,2260,157.3
k,50,2051,2260,157.3
k,51,1820,2260,157.3
k,52,1180,2260,157.3
k,53,6987,2020,117.14		! Ngang 2
k,54,5964,2020,117.14
k,55,2834,2020,117.14
k,56,1820,2020,117.14
k,57,6987,1850,88.69			! Ngang 3
k,58,5964,1850,88.69
k,59,2834,1850,88.69
k,60,1820,1850,88.69
k,61,7657,1410,15.06
k,62,7657,1320,0			! Ngang 4
k,63,6987,1320,0
k,64,5964,1320,0
k,65,5349,1320,0
k,66,4400,1320,0
k,67,3617,1320,0
k,68,2834,1320,0
k,69,1820,1320,0
k,70,1180,1320,0
k,71,7657,1060,0
k,72,7657,860,0			! Ngang 5
k,73,6987,860,0
k,74,5964,860,0
k,75,5349,860,0
k,76,4400,860,0
k,77,3617,860,0
k,78,2834,860,0
k,79,1820,860,0
k,80,1180,860,0
k,81,7657,580,0			! Ngang 6
k,82,6987,580,0
k,83,5964,580,0
k,84,5699,580,0
k,85,5349,580,0
k,86,4999,580,0
k,87,4400,580,0
k,88,3617,580,0
k,89,2834,580,0
k,90,1820,580,0
k,91,1530,580,0
k,92,1180,580,0
k,93,830,580,0
k,94,0,580,0
k,95,5699,406.65,0
k,96,4999,406.65,0
k,97,1530,406.65,0
k,98,830,406.65,0		! Ngang 7
k,99,766.36,290,0		! Ngang 8

l,1,2			! nối điểm 1 và điểm 2
l,2,3			! nối điểm 2 và điểm 3
larc,3,98,99 	! tạo cung tròn đi qua 3 điểm 3, 98, 99
larc,98,97,4
larc,97,5,3,440
*do,i,5,10
l,i,i+1
*enddo
larc,11,12,96
larc,12,13,95
*do,i,13,40
l,i,i+1
*enddo
l,41,1
l,23,42
*do,i,42,51
l,i,i+1
*enddo
l,52,35
l,25,42		! khung noc
*do,i,26,32
l,i,i+18
*enddo
l,33,52
*do,i,53,59,2	! thang ngang cua
l,i,i+1
*enddo
l,22,61
l,62,63
*do,i,64,67		! ngang 4
l,i,i+1
*enddo
l,69,70
l,70,36
l,20,71			! ngang 5
l,72,73
*do,i,74,77
l,i,i+1
*enddo
l,79,80
l,80,37
l,81,82		! ngang 6
*do,i,83,88
l,i,i+1
*enddo
*do,i,90,93
l,i,i+1
*enddo
l,94,39

! thanh doc tu sau ra truoc, tu tren xuong duoi
! row 1
l,42,61
l,61,62
l,43,53
l,53,57
l,57,63
l,45,54
l,54,58
l,58,64
l,47,66
l,49,55
l,55,59
l,59,68
l,51,56
l,56,60
l,60,69
l,52,70
! row 2
l,62,71
l,71,72
*do,i,63,70
l,i,i+10
*enddo
l,64,75
l,75,66
l,66,77
l,77,68
l,69,80
l,80,36
! row 3
l,72,81
l,73,82
l,74,83
l,75,85
l,76,87
l,77,88
l,78,89
l,79,90
l,80,92
l,37,94
! row 4
l,81,18
l,82,16
l,83,15
l,84,95
l,86,96
l,87,9
l,89,8
l,90,7
l,91,97
l,93,98
l,94,41
l,99,41

NUMMRG,KP		! merge overlaped keypoint 

! ****************************************
! ! Khai bao diem hinh hoc mat phai
! ****************************************
!/prep7
*get,nk,kp,,num,max		! get highest number of keypoint

k,nk+1,0,0,2270
k,nk+2,740,0,2270
k,nk+3,740,140,2270
k,nk+4,1180,580,2270
k,nk+5,1620,140,2270
k,nk+6,1620,0,2270
k,nk+7,1820,0,2270
k,nk+8,3617,0,2270
k,nk+9,4400,0,2270
k,nk+10,4909,0,2270
k,nk+11,4909,140,2270
k,nk+12,5349,580,2270
k,nk+13,5789,140,2270
k,nk+14,5789,0,2270
k,nk+15,5964,0,2270
k,nk+16,6987,0,2270
k,nk+17,7657,200,2270
k,nk+18,7657,430,2270
k,nk+19,7857,430,2270
k,nk+20,7857,1060,2270
k,nk+21,7857,1320,2270
k,nk+22,7857,1410,2254.94
k,nk+23,7857,2260,2112.7
k,nk+24,7857,2560,2062.5
k,nk+25,7657,2560,2062.5
k,nk+26,6749,2560,2062.5
k,nk+27,5964,2560,2062.5
k,nk+28,5183,2560,2062.5
k,nk+29,4400,2560,2062.5
k,nk+30,3617,2560,2062.5
k,nk+31,2834,2560,2062.5
k,nk+32,2051,2560,2062.5
k,nk+33,1180,2560,2062.5
k,nk+34,305,2560,2062.5
k,nk+35,305,2260,2112.7
k,nk+36,250.49,2092,2140.81
k,nk+37,188.84,1902,2172.61
k,nk+38,0,1320,2270
k,nk+39,0,860,2270
k,nk+40,-143,860,2270
k,nk+41,-143,580,2270
k,nk+42,-143,290,2270
k,nk+43,0,290,2270
k,nk+44,7657,2260,2112.7		!ngang 1
k,nk+45,6749,2260,2112.7
k,nk+46,5964,2260,2112.7
k,nk+47,5183,2260,2112.7
k,nk+48,4400,2260,2112.7
k,nk+49,3617,2260,2112.7
k,nk+50,2834,2260,2112.7
k,nk+51,2051,2260,2112.7
k,nk+52,1180,2260,2112.7
k,nk+53,1180,2092,2140.81		! ngang 2
k,nk+54,1180,1902,2172.61
k,nk+55,7657,1410,2254.94 		! ngang 3
k,nk+56,7657,1320,2270
k,nk+57,6987,1320,2270
k,nk+58,5964,1320,2270
k,nk+59,5349,1320,2270
k,nk+60,4400,1320,2270
k,nk+61,3617,1320,2270
k,nk+62,2834,1320,2270
k,nk+63,1820,1320,2270
k,nk+64,1180,1320,2270
k,nk+65,7657,1060,2270
k,nk+66,7657,860,2270			! ngang 4
k,nk+67,6987,860,2270
k,nk+68,5964,860,2270
k,nk+69,5349,860,2270
k,nk+70,4400,860,2270
k,nk+71,3617,860,2270
k,nk+72,2834,860,2270
k,nk+73,1820,860,2270
k,nk+74,1180,860,2270
k,nk+75,7657,580,2270		! ngang 5
k,nk+76,6987,580,2270
k,nk+77,5964,580,2270
k,nk+78,5699,580,2270
k,nk+79,5349,580,2270
k,nk+80,4999,580,2270
k,nk+81,4400,580,2270
k,nk+82,3617,580,2270
k,nk+83,2834,580,2270
k,nk+84,1820,580,2270
k,nk+85,1530,580,2270
k,nk+86,1180,580,2270
k,nk+87,830,580,2270
k,nk+88,0,580,2270
k,nk+89,5699,406.65,2270	! ngang 6
k,nk+90,4999,406.65,2270
k,nk+91,1530,406.65,2270
k,nk+92,830,406.65,2270
k,nk+93,766.36,290,2270

l,nk+1,nk+2
l,nk+2,nk+3
larc,nk+3,nk+92,nk+93
larc,nk+92,nk+91,nk+4
larc,nk+91,nk+5,nk+3,440
l,nk+5,nk+6
*do,i,nk+6,nk+10
l,i,i+1
*enddo
larc,nk+11,nk+12,nk+90
larc,nk+12,nk+13,nk+89
*do,i,nk+13,nk+42
l,i,i+1
*enddo
l,nk+43,nk+1
! ngang 1
l,nk+23,nk+44
*do,i,nk+44,nk+51
l,i,i+1
*enddo
*do,i,nk+44,nk+52
l,i,i-19
*enddo
l,nk+52,nk+35
! ngang 2
l,nk+36,nk+53
l,nk+37,nk+54

*do,i,nk+56,nk+63
l,i,i+1
l,i+10,i+11
l,i,i+10
*enddo
l,nk+64,nk+38
l,nk+74,nk+39
l,nk+64,nk+74
l,nk+75,nk+76
*do,i,nk+77,nk+87
l,i,i+1
*enddo
l,nk+87,nk+88
l,nk+88,nk+41
l,nk+44,nk+55
l,nk+55,nk+56
l,nk+22,nk+55
l,nk+20,nk+65
l,nk+46,nk+58
l,nk+48,nk+60
l,nk+50,nk+62
l,nk+52,nk+53
l,nk+53,nk+54
l,nk+54,nk+64

*do,i,nk+67,nk+73,2
l,i,i-11
l,i,i-9
*enddo

l,nk+66,nk+75
l,nk+75,nk+18
l,nk+67,nk+76
l,nk+68,nk+77
l,nk+69,nk+79
l,nk+70,nk+81
l,nk+71,nk+82
l,nk+72,nk+83
l,nk+73,nk+84
l,nk+74,nk+86
l,nk+39,nk+88
l,nk+76,nk+16
l,nk+77,nk+15
l,nk+78,nk+89
l,nk+80,nk+90
l,nk+81,nk+9
l,nk+82,nk+8
l,nk+84,nk+7
l,nk+85,nk+91
l,nk+87,nk+92
l,nk+88,nk+43
l,nk+93,nk+43
NUMMRG,KP		! merge overlaped keypoint 


! *********************************
! ! Khai bao diem hinh hoc mat truoc
! *********************************
*get,nk,kp,,num,max		! get highest number of keypoint
k,nk+1,305,2560,705
k,nk+2,305,2560,1565
k,nk+3,305,2260,157.3
k,nk+4,305,2260,705
k,nk+5,305,2260,1565
k,nk+6,305,2260,2112.7
k,nk+7,-143,860,0
k,nk+8,-143,860,415
k,nk+9,-143,860,715
k,nk+10,-143,860,1555
k,nk+11,-143,860,1855
k,nk+12,-143,860,2270
k,nk+13,-143,580,0
k,nk+14,-143,580,415
k,nk+15,-143,580,650
k,nk+16,-143,580,715
k,nk+17,-143,580,1555
k,nk+18,-143,580,1620
k,nk+19,-143,580,1855
k,nk+20,-143,580,2270
k,nk+21,-143,290,0
k,nk+22,-143,290,650
k,nk+23,-143,290,1620
k,nk+24,-143,290,2270

l,nk+1,nk+4
l,nk+2,nk+5
*do,i,nk+3,nk+5
l,i,i+1
*enddo
*do,i,nk+7,nk+11
l,i,i+1
*enddo
*do,i,nk+13,nk+19
l,i,i+1
*enddo
*do,i,nk+21,nk+23
l,i,i+1
*enddo
l,nk+8, nk+14
l,nk+9, nk+16
l,nk+10, nk+17
l,nk+11,nk+19
l,nk+15,nk+22
l,nk+18,nk+23
NUMMRG,KP		! merge overlaped keypoint 
! **********************************
! ! Khai bao diem hinh hoc mat sau
! **********************************
/prep7
*get,nk,kp,,num,max		! get highest number of keypoint
k,nk+1,7857,2560,1565
k,nk+2,7857,2560,705
k,nk+3,7857,2260,1843.5
k,nk+4,7857,2260,1565
k,nk+5,7857,2260,705
k,nk+6,7857,2260,426.5
k,nk+7,7857,1320,2270
k,nk+8,7857,1320,2022.5
k,nk+9,7857,1320,1643
k,nk+10,7857,1320,1246
k,nk+11,7857,1320,1024
k,nk+12,7857,1320,627
k,nk+13,7857,1320,247.5
k,nk+14,7857,1320,0
k,nk+15,7857,983,2270
k,nk+16,7857,983,2022.5
k,nk+17,7857,983,1842.5
k,nk+18,7857,983,1643
k,nk+19,7857,983,1246
k,nk+20,7857,983,1024
k,nk+21,7857,983,627
k,nk+22,7857,983,427.5
k,nk+23,7857,983,247.5
k,nk+24,7857,983,0
k,nk+25,7857,706.5,1842.5
k,nk+26,7857,706.5,427.5
k,nk+27,7857,430,2270
k,nk+28,7857,430,1842.5
k,nk+29,7857,430,427.5
k,nk+30,7857,430,0

*do,i,nk+3,nk+5
l,i,i+1
*enddo
*do,i,nk+7,nk+13
l,i,i+1
*enddo
*do,i,nk+15,nk+23
l,i,i+1
*enddo
l,nk+25,nk+26
*do,i,nk+27,nk+29
l,i,i+1
*enddo

l,nk+1,nk+4
l,nk+2,nk+5
l,nk+3,nk+8
l,nk+6,nk+13
l,nk+8,nk+16
*do,i,nk+9,nk+12
l,i,i+9
*enddo
l,nk+17,nk+25
l,nk+22,nk+26
l,nk+25,nk+28
l,nk+26,nk+29

NUMMRG,KP		! merge overlaped keypoint 
! **************************************
! ! Khai bao diem hinh hoc Khung noc
! **************************************
*get,nk,kp,,num,max		! get highest number of keypoint
k,nk+1,7857,2560,2062.5
k,nk+2,7657,2560,2062.5
k,nk+3,6749,2560,2062.5
k,nk+4,5964,2560,2062.5
k,nk+5,5183,2560,2062.5
k,nk+6,4400,2560,2062.5
k,nk+7,3617,2560,2062.5
k,nk+8,2834,2560,2062.5
k,nk+9,2051,2560,2062.5
k,nk+10,1180,2560,2062.5
k,nk+11,305, 2560,2062.5
k,nk+12,7857,2560,1565
k,nk+13,7657,2560,1565
k,nk+14,6749,2560,1565
k,nk+15,5964,2560,1565
k,nk+16,5183,2560,1565
k,nk+17,4400,2560,1565
k,nk+18,3617,2560,1565
k,nk+19,2834,2560,1565
k,nk+20,2051,2560,1565
k,nk+21,1180,2560,1565
k,nk+22,305, 2560,1565
k,nk+23,7857,2560,705
k,nk+24,7657,2560,705
k,nk+25,6749,2560,705
k,nk+26,5964,2560,705
k,nk+27,5183,2560,705
k,nk+28,4400,2560,705
k,nk+29,3617,2560,705
k,nk+30,2834,2560,705
k,nk+31,2051,2560,705
k,nk+32,1180,2560,705
k,nk+33,305, 2560,705
k,nk+34,7857,2560,207.5
k,nk+35,7657,2560,207.5
k,nk+36,6749,2560,207.5
k,nk+37,5964,2560,207.5
k,nk+38,5183,2560,207.5
k,nk+39,4400,2560,207.5
k,nk+40,3617,2560,207.5
k,nk+41,2834,2560,207.5
k,nk+42,2051,2560,207.5
k,nk+43,1180,2560,207.5
k,nk+44,305, 2560,207.5

! *do,i,nk+1,nk+10
! l,i,i+1
! *enddo
*do,i,nk+12,nk+21
l,i,i+1
*enddo
*do,i,nk+23,nk+32
l,i,i+1
*enddo
! *do,i,nk+34,nk+43
! l,i,i+1
! *enddo
*do,i,nk+1,nk+11
l,i,i+11
l,i+11,i+22
l,i+22,i+33
*enddo
NUMMRG,KP		! merge overlaped keypoint 

! *************************************
! Khai bao diem hinh hoc mat san
! *************************************

*get,nk,kp,,num,max		! get highest number of keypoint
k,nk+1,0,290,0				! bao quanh - vong 1
k,nk+2,766.36,290,0
k,nk+3,1593.64,290,0
k,nk+4,1820,290,0
k,nk+5,3617,290,0
k,nk+6,4400,290,0
k,nk+7,4635.36,290,0
k,nk+8,5762.64,290,0
k,nk+9,5964,290,0
k,nk+10,6987,290,0
k,nk+11,7657,290,0
k,nk+12,7657,430,0
k,nk+13,0,290,2270
k,nk+14,766.36,290,2270
k,nk+15,1593.64,290,2270
k,nk+16,1820,290,2270
k,nk+17,3617,290,2270
k,nk+18,4400,290,2270
k,nk+19,4635.36,290,2270
k,nk+20,5762.64,290,2270
k,nk+21,5964,290,2270
k,nk+22,6987,290,2270
k,nk+23,7657,290,2270
k,nk+24,7657,430,2270
k,nk+25,0,290,585				! vong 2
k,nk+26,766.36,290,585
k,nk+27,1593.64,290,585
k,nk+28,3093.64,290,585
k,nk+29,3343.64,290,585
k,nk+30,3902.36,290,585
k,nk+31,4152.36,290,585
k,nk+32,4935.36,290,585
k,nk+33,5762.64,290,585
k,nk+34,6987,290,585
k,nk+35,0,290,1685
k,nk+36,766.36,290,1685
k,nk+37,1593.64,290,1685
k,nk+38,3093.64,290,1685
k,nk+39,3343.64,290,1685
k,nk+40,3902.36,290,1685
k,nk+41,4152.36,290,1685
k,nk+42,4935.36,290,1685
k,nk+43,5762.64,290,1685
k,nk+44,6987,290,1685
k,nk+45,0,290,950			! vong 3 - sub 1
k,nk+46,766.36,290,950
k,nk+47,766.36,290,870
k,nk+48,966.36,290,870
k,nk+49,1393.64,290,870
k,nk+50,1593.64,290,870
k,nk+51,1593.64,290,950
k,nk+52,2093.64,290,950
k,nk+53,2593.64,290,950
k,nk+54,3093.64,290,950
k,nk+55,3343.64,290,785			! ngang1
k,nk+56,3902.36,290,785			! ngang 2
k,nk+57,4152.36,290,950		! vong 3 - sub 2
k,nk+58,4935.36,290,950
k,nk+59,4935.36,290,870
k,nk+60,5135.36,290,870
k,nk+61,5562.64,290,870
k,nk+62,5762.64,290,870
k,nk+63,5762.64,290,950
k,nk+64,6987,290,950
k,nk+65,7657,290,950
k,nk+66,7657,430,950
k,nk+67,7857,430,950
k,nk+68,0,290,1320			! vong 3 - sub 3
k,nk+69,766.36,290,1320
k,nk+70,766.36,290,1400
k,nk+71,966.36,290,1400
k,nk+72,1393.64,290,1400
k,nk+73,1593.64,290,1400
k,nk+74,1593.64,290,1320
k,nk+75,2093.64,290,1320
k,nk+76,2593.64,290,1320
k,nk+77,3093.64,290,1320
k,nk+78,3343.64,290,1485		! ngang 3
k,nk+79,3902.36,290,1485		! ngang 4
k,nk+80,4152.36,290,1320		! vong 3 - sub 4
k,nk+81,4935.36,290,1320
k,nk+82,4935.36,290,1400
k,nk+83,5135.36,290,1400
k,nk+84,5562.64,290,1400
k,nk+85,5762.64,290,1400
k,nk+86,5762.64,290,1320
k,nk+87,6987,290,1320
k,nk+88,7657,290,1320
k,nk+89,7657,430,1320
k,nk+90,7857,430,1320

l,nk+1,nk+2

*do,i,nk+3,nk+8
l,i,i+1
*enddo
l,nk+10,nk+11
l,nk+11,nk+12

l,nk+13,nk+14

*do,i,nk+15,nk+20
l,i,i+1
*enddo
l,nk+22,nk+23
l,nk+23,nk+24


*do,i,nk+1,nk+12
l,i,i+12
*enddo
*do,i,nk+25,nk+33
l,i,i+1
*enddo
*do,i,nk+35,nk+43
l,i,i+1
*enddo
*do,i,nk+45,nk+53
l,i,i+1
*enddo
l,nk+55,nk+56
*do,i,nk+57,nk+66
l,i,i+1
*enddo
*do,i,nk+68,nk+76		! sub 3
l,i,i+1
*enddo
l,nk+78,nk+79
*do,i,nk+80,nk+89
l,i,i+1
*enddo

l,nk+48,nk+71
l,nk+49,nk+72
l,nk+52,nk+75
l,nk+53,nk+76
l,nk+28,nk+38
l,nk+29,nk+39
l,nk+30,nk+40
l,nk+31,nk+41
l,nk+32,nk+42
l,nk+60,nk+83
l,nk+61,nk+84


! ******************************
! Mat cat ngang
! Loai hop chu nhat, 40x40x2
SECTYPE,   1, BEAM, HREC, B40, 0   
SECOFFSET, CENT 
SECDATA,40,40,2,2,2,2 

! Loai hop chu nhat, 60x40x2
SECTYPE,   2, BEAM, HREC, B60, 0   
SECOFFSET, CENT 
SECDATA,60,40,2,2,2,2  

! Loai hop chu nhat, 100x80x2

SECTYPE,   3, BEAM, HREC, B100, 0   
SECOFFSET, CENT 
SECDATA,100,80,2,2,2,2


LESIZE,all,50

FLST,5,20,4,ORDE,4  
FITEM,5,428 
FITEM,5,437 
FITEM,5,440 
FITEM,5,-457
CM,_Y,LINE  
LSEL, , , ,P51X 
CM,_Y1,LINE 
CMSEL,S,_Y  
!*  
!*  
CMSEL,S,_Y1 
LATT,1, ,1, , , ,3  
CMSEL,S,_Y  
CMDELE,_Y   
CMDELE,_Y1  

FLST,5,71,4,ORDE,46 
FITEM,5,18  
FITEM,5,36  
FITEM,5,-37 
FITEM,5,42  
FITEM,5,96  
FITEM,5,-110
FITEM,5,112 
FITEM,5,-115
FITEM,5,117 
FITEM,5,119 
FITEM,5,-120
FITEM,5,128 
FITEM,5,-130
FITEM,5,132 
FITEM,5,134 
FITEM,5,-135
FITEM,5,137 
FITEM,5,-140
FITEM,5,143 
FITEM,5,-145
FITEM,5,148 
FITEM,5,167 
FITEM,5,185 
FITEM,5,-188
FITEM,5,193 
FITEM,5,217 
FITEM,5,223 
FITEM,5,229 
FITEM,5,235 
FITEM,5,241 
FITEM,5,255 
FITEM,5,-256
FITEM,5,259 
FITEM,5,-264
FITEM,5,273 
FITEM,5,-274
FITEM,5,276 
FITEM,5,278 
FITEM,5,280 
FITEM,5,282 
FITEM,5,-283
FITEM,5,285 
FITEM,5,288 
FITEM,5,293 
FITEM,5,418 
FITEM,5,427 
CM,_Y,LINE  
LSEL, , , ,P51X 
CM,_Y1,LINE 
CMSEL,S,_Y  
!*  
!*  
CMSEL,S,_Y1 
LATT,1, ,1, , , ,2  
CMSEL,S,_Y  
CMDELE,_Y   
CMDELE,_Y1 

LMESH,all
/ESHAPE,1.0
EPLOT
/REPLOT