Hello,
I’m trying to perform a nonlinear analysis of a corbel, but I can’t figure out the material working law used during the analysis.
+PROG AQUA
head
ECHO FULL EXTR
NORM DC US NDC AASHTO-2014 COUN US UNIT 0 LANG 1 G 10
STEE no 1 type s scm0 1.0 scm1 1.0
ssla eps ULTI
SSLA eps SIG $ EAE 19.5.1
10.35 301.17
1.725 300
0 0
-1.725 -300
-10.35 -301.17
PROF NO 1 TYPE HEB 300
end
+prog sofimshc
head Corbel
SYST 3D GDIR ZZ GDIV 10000
CTRL MESH 1
CTRL HMIN 0.2
spt no 1 fix f
spt no 2 z -5.0
sln no 1 npa 1 npe 2 sno 1 grp 1
grp no 1 titl 'Corbel'
end
+prog sofiload
head
lc no 1 titl 'Point load'
node no 2 p1 100
end
+prog ase
head
lc all
end
+PROG ASE
HEAD Buckling Eigenvalues for Stresses of LC 1
SYST PLC 1 FACV 0.0 $
EIGE 5 BUCK LC 701 $
END
+PROG ASE
HEAD with imperfection
OBLI LC 701 FACV 0.21978
ULTI 50 FAK1 0.1 DFAK 1 FAKE -0.0001 PRO 1 PRIM NO DL NO EPSS 10 $ start at FAC1 0.1 to better recognize predeformation in load-defo plot
SYST PROB TH2 iter 200 tol 0.001 TOL4 0.005
LC 200
LCC 1
NSTR KMOD S1 KSV UL
END
I wonder why the cross section reaches 345 MPa during the non linear analysis, instead of 300 MPa as specified in AQUA. Besides, isn’t the ultimate strain defined in AQUA taken into account during the ULTI analysis? How could I perform an analysis with different ultimate deformations in tension and compression?
Thanks and regards.