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本人用移动质量球模拟移动车辆荷载,用生死单元法模拟,桥梁直接用梁单元模拟,总共400个单元。提取桥梁上某一个节点的竖向位移、速度、加速度、信号。为了分析方便,就想设定统一的采样频率,因此设定荷载步和荷载子步个数来实现。比如荷载步在这里用该是400个,我设置了荷载子步为20,那么得到的时间序列的长度应该是8000,但是模拟出来的长度是5000多一点点,这是为什么?
/SOLU$ANTYPE,4$NLGEOM,ON !open large deformation
NROPT,FULL$ACEL,,9.8 !Newton-Raphson full transient analysis,open gravity
ESEL,S,REAL,,2$EKILL,ALL$ALLSEl,ALL !KILL all the mass element
timint,on,all$OUTRES,all,all !open trans
alphad,0.001 !a damp
betad,0.0001 !beta damp
*do,i,1,N0,1 !N0=400
EALIVE,1000+i !1000+i is the node number
time,time_ele*(i+1) !time cordinate, time_ele is the time that the mass moving through each elament
NSUBST, 20 !set sample frequence
kbc,1
solve
EKILL,1000+i
*enddo
finish
!result extract
/POST26
*DIM,dis,array,10000,2
*DIM,velo,array,10000,2
*DIM,accel,array,10000,2
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