可以使用不同的理论模拟混凝土的破坏过程,例如:
(1) Abaqus
(2) Cosmol
(3) Plaxis
FLAC3D的混凝土模型使用的是基于断裂能量和模量退化的塑性损伤(Plastic-Damage)理论。本文的目的是为了测试FLAC3D官方展示的钢筋混凝土梁的损伤机理。
zone cmodel assign concrete
(6) compression-d---压缩损伤参数
fish define parameters
global young = 2.1e4 ; MPa
global poisson = 0.18
global Gt = 40e-5 ; MN/m
global Lt = 0.0826 ; m
global fc = 27.6 ; MPa
global ft = 1.48 ; MPa
global Gc = 5690e-6 ; MN/m
global Lc = 0.0826 ; m
global kbc0 = 1.16
global fc0 = 16.04 ; MPa
global ft0 = 1.48 ; MPa
global dc = 700 ; dc
global dt = 4000 ; dt
end
[parameters]
zone create brick size 4 40 4
zone cmodel assign concrete
zone property young [young] poisson [poisson]
zone property com-strength [fc] com-initial [fc0] com-energy-fracture [Gc]
zone property com-length-reference [Lc] com-d [dc]
zone property ten-strength [ft] ten-initial [ft0] tens-energy-fracture [Gt]
zone property ten-length-reference [Lt] ten-d [dt]
zone property ratio-biaxial [kbc0] ten-recovery 0.2
zone property dilation 20
0 =
zone face apply vel-z 0 range position-y=34,35 pos-z=0
15,16 pos-z=4 =
zone face apply vel-z -1e-7 range position-y=25,26 pos-z=4
structure cable create by-line (2,4,0.5) (2,36,0.5) ...
segments 20
structure cable create by-line (3,4,0.5) (3,36,0.5) ...
segments 20
structure cable property young 3e10 yield-tension 1e8 ...
2.0
structure cable property grout-stiffness 3e10 ...
1e10 grout-perimeter 1.0
model step [20000]