本文用一个简单的例子来介绍采用ANSYS开展地震分析(包括静态分析、模态分析、反应谱分析和LS-DYNA时程分析)的一些概念,并给出详细的命令流,希望能够给那些初学者一些启示和帮助。本文命令流在ANSYS15.0下测试通过。

ANTYPE,8 !分析类型为谱分析 SPOPT ,SPRS , ,!单点反应谱分析

SVTYPE ,2 !指定单点反应谱分析类型-地震加速度 SED ,1 ,0 ,0 !指定地震加速度方向为x方向

!计算反应谱

gama = 0.9 + (0.05-damping_coef)/(0.5+5*damping_coef) yita1 = 0.02+ (0.05-damping_coef)/8

yita2 = 1.0 + (0.05-damping_coef)/(0.06+1.7*damping_coef) T1 = 0.00001 S1 = 0.45*alpha_max T2 = 0.1

S2 = yita2*alpha_max T3 = Tg

S3 = yita2*alpha_max T4 = 2*Tg

S4 = ((Tg/T4)**gama)*yita2*alpha_max T5 = 2.5*Tg

S5 = ((Tg/T5)**gama)*yita2*alpha_max T6 = 3*Tg

S6 = ((Tg/T6)**gama)*yita2*alpha_max T7 = 3.5*Tg

S7 = ((Tg/T7)**gama)*yita2*alpha_max T8 = 4*Tg

S8 = ((Tg/T8)**gama)*yita2*alpha_max T9 = 4.5*Tg

S9 = ((Tg/T9)**gama)*yita2*alpha_max T10 = 5*Tg

S10 = ((Tg/T10)**gama)*yita2*alpha_max T11 = 3.0

S11 = (yita2*0.2**gama-yita1*(T11-5*Tg))*alpha_max T12 = 6.0

S12 = (yita2*0.2**gama-yita1*(T12-5*Tg))*alpha_max

!周期折减

S1=S1*9.8 $S2=S2*9.8 $S3=S3*9.8 $S4=S4*9.8 $S5=S5*9.8

S6=S6*9.8 $S7=S7*9.8 $S8=S8*9.8 $S9=S9*9.8 $S10=S10*9.8 $S11=S11*9.8 $S12=S12*9.8

FREQ,1/T12,1/T11,1/T10,1/T9,1/T8,1/T7,1/T6,1/T5,1/T4 FREQ,1/T3,1/T2,1/T1

SV,0.05,S12,S11,S10,S9,S8,S7,S6,S5,S4 SV,0.05,S3,S2,S1