Selasa, 07 Juni 2011

tugas ads contoh perhitungan modal 2



CONTOH  SOAL 1 :
H =   3  meter
L  =   3  meter

 
PENYELESAIAN:
Ø  Input data



·         BARIS 1

5              =  Zona gempa
1              =  Tanah keras
981         =  Tingkat gravitasi
0.04        =  Skala gempa
1              =  I.K
3              = Bayak tingkat
3              = Ragam Getar
0.05        = Faktor redaman
·         Kolom 1
W = q x l
Dari nilai


W 1=  3 x 6                                                          
        = 18 ton = 18000 kg

W 1=W2=W3






·         KOLOM2
KEKAKUAN TINGKAT
K1 = 12x2,3x105 . X b x h3
                                      H3
      = 12x2,3x105 . X 504
                                          4003
         = 22461 kg/cm  ( 3 kolom )
K2= K3=K1

·         KOLOM 3
H1 = 400 cm

H2= 400  +  400
     =800 cm

H3= 800 + 400
     = 1200 cm
H4 =1200 + 400
      = 1600 cm
H5= 1600 + 400
      = 20000 cm


1.       PERIODE GETAR ALAMI
a.    Mode I =  T1 = 0,40 detik
b.    Mode II = T2 = 0,14 detik
c.     Mode II = T3 = 0,09 detik

2.       POLA RAGAM GETAR




1.       DISTRIBUSI GAYA GESER GEMPA













Selasa, 17 Mei 2011

SDOF

Single Degree of Freedom


The simplest vibratory system can be described by a single mass connected to a spring (and possibly a dashpot). The mass is allowed to travel only along the spring elongation direction. Such systems are called Single Degree-of-Freedom (SDOF) systems and are shown in the following figure,







 


SDOF vibration can be analyzed by Newton's second law of motion, F = m*a. The analysis can be easily visualized with the aid of a free body diagram,
with the initial conditions, 
The solution to the general SDOF equation of motion is shown in the damped SDOF discussion.