反应谱的操作过程

waltdon

请高手指点：绘制一条地震作用下的反应谱，具体操作过程是什么？？
我是一个新手，老板要求这两天内弄懂整个操作过程，请指点！谢谢！

[ 本帖最后由 xuruikl 于 2007-10-29 19:47 编辑 ]

zengzhan

请讲明白一点，反应谱是加速度谱吗？
你有什么已知数据？
做什么类型的分析？

waltdon

是这样的：我手头现在有若干条地震波，老板要求我利用这几条地震波画出单质点单自由度体系在它们的激励下的位移谱，速度谱 和加速度谱 。请高人指教，谢谢！！！因为刚刚上路，所以几乎不懂，请详细的告知鄙人整个操作过程，不胜感激！！

waltdon

我现在也有点不是很清楚，应该是瞬态分析吧。就是单自由度体系的反应谱的形成过程，只需要告诉我加速度谱（加速度—时间关系曲线）就可以了，如果高人忙的话，再次感谢！！！！

venture

应该是谱分析，关于地震的谱分析资料很多，自己搜一下。

zengzhan

应该是瞬态分析，你读入的是地震加速度谱吗？
你可以用input读入加速度数据，用do循环加载，就可以得到响应了

waltdon

谢谢  我按照瞬态分析进行了一下 得到了曲线 可问题是 突然发现出错了——随着周期的加大 加速度竟然一直在增加，从0秒到3秒 一直在呈递增趋势，这显然是与设计反应谱矛盾，请告诉我问题出在哪里了？？谢谢（注：这几天网络一直出问题，无法上网，所以今天才来，抱歉！）

waltdon

请高手给小弟指一条出路：反应谱曲线随着周期竟然不断增加 错在何处？采用的单元类型为：BEAM188,MASS21,材料属性设置了两个 一个没有设置密度 一个设置了，其他数据相同。急盼中~~~~:@L

[ 本帖最后由 waltdon 于 2007-5-9 14:26 编辑 ]

zengzhan

把你的程序发过来看看，大家讨论讨论

waltdon

/PREP7  
!*  
ET,1,BEAM3  
!*  
ET,2,MASS21
!*  
KEYOPT,1,6,1
KEYOPT,1,9,0
KEYOPT,1,10,0   
!*  
KEYOPT,2,1,0
KEYOPT,2,2,0
KEYOPT,2,3,4
!*  
R,1,0.04,0.04*0.04/12,0.2, , , ,
!*  
!*  
R,2,1000,   
!*  
!*  
MPTEMP,,,,,,,,  
MPTEMP,1,0  
MPDATA,EX,1,,2E11   
MPDATA,PRXY,1,,0.2  
MPTEMP,,,,,,,,  
MPTEMP,1,0  
MPDATA,DENS,1,,0
MPTEMP,,,,,,,,  
MPTEMP,1,0  
MPDATA,EX,2,,2E11   
MPDATA,PRXY,2,,0.2  
MPTEMP,,,,,,,,  
MPTEMP,1,0  
MPDATA,DENS,2,,7800
SAVE
K,1,0,0,0,  
K,2,0,10,0,  
LSTR,       1,       2  
TYPE,   1   
MAT,       1
REAL,       1   
ESYS,       0   
SECNUM,
!*  
CM,_Y,LINE  
LSEL, , , ,       1
CM,_Y1,LINE
CMSEL,S,_Y  
!*  
!*  
CMSEL,S,_Y1
LATT,1,1,1, , , ,   
CMSEL,S,_Y  
CMDELE,_Y   
CMDELE,_Y1  
!*  
CM,_Y,KP
KSEL, , , ,       2
CM,_Y1,KP   
CMSEL,S,_Y  
!*  
CMSEL,S,_Y1
KATT,       2,       2,   2,       0
CMSEL,S,_Y  
CMDELE,_Y   
CMDELE,_Y1  
!*  
ESIZE,0,1,  
LMESH,       1  
FLST,5,1,3,ORDE,1   
FITEM,5,2   
CM,_Y,KP
KSEL, , , ,P51X
CM,_Y1,KP   
CMSEL,S,_Y  
!*  
!*  
CMSEL,S,_Y1
KESIZE,ALL,1
CMSEL,S,_Y  
CMDELE,_Y1  
CMDELE,_Y   
!*  
KMESH,       2  
*SET,NT,751
*SET,DT,0.02
*DIM,AC(1),ARRAY,751,1,0,ACEL,TIME,
!*  
*CREATE,ansuitmp
*VREAD,AC(1),'Acc','txt','Seismic\',1, , , , , ,
(F12.8)
*END
/INPUT,ansuitmp
!*  
FINISH  
/SOL
FLST,2,1,3,ORDE,1   
FITEM,2,1   
!*  
/GO
DK,P51X, , , ,0,ALL, , , , , ,  
!*  
ANTYPE,4
!*  
TRNOPT,FULL
LUMPM,0
!*  
NSUBST,1,0,0
OUTRES,ERASE
OUTRES,ALL,ALL  
ALPHAD,1.4  
BETAD,0.0020
!*  
OUTPR,BASIC,ALL,
*DO,I,1,NT  
ACEL,AC(I)*0.01,0,0
TIME,I*DT   
SOLVE   
*ENDDO  
FINISH  
/POST26
FILE,'single degree freedom system','rst','.'   
/UI,COLL,1  
NUMVAR,200  
SOLU,191,NCMIT  
STORE,MERGE
FILLDATA,191,,,,1,1
REALVAR,191,191
!*  
NSOL,2,2,U,X,UX_2   
STORE,MERGE
!*  
NSOL,3,2,V,X,VX_3   
STORE,MERGE
!*  
NSOL,4,2,A,X, AX_4  
STORE,MERGE
PLVAR,2, , , , , , , , , ,  
PLVAR,3, , , , , , , , , ,  
PLVAR,4, , , , , , , , , ,  
SAVE,,,,ALL
FINISH  
/CLEAR,START
/COM,ANSYS RELEASE 10.0    UP20050718       18:32:47    05/10/2007
/input,start100,ans,'C:\Program Files\Ansys Inc\v100\ANSYS\apdl\',,,,,,,,,,,,,,,,1

waltdon

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4.171081818
7.102927273
10.82063636
19.88820909
15.95892727
-13.81293636
-33.33843636
-24.11974545
-9.792972727
5.108063636
19.94865455
17.89334545
4.684909091
-8.160818182
-7.798109091
-7.889018182

sysh320

首先应该搞清楚反应谱的概念。
对单自由度结构，已知结构的阻尼比，对给定的地震输入，按结构固有周期变化的结构最大地震反应值组成的曲线，称为反应谱。反应谱有速度反应谱，位移反应谱和加速度反应谱。

waltdon

谢谢 这些基本知识我都明白 也知道 问题是我就是这样做的 为何得到的却是加速度反应谱岁结构周期的不断增大一直处于增加状态呢？位移谱和速度谱也是一直处于不断增加状态（按照理论：位移谱一直增大，速度谱增大到一定程度就处于一个恒定状态了 而加速度应该是先增后减的啊！！）

waltdon

这个问题至今依然没有得到解决 各位大侠也没有前来帮助 是因为过于简单 不屑于解决还是太忙 没有时间前来？？
前一段时间一直忙于其他开题 所以几乎一个月都没有来了
我们的速度是不是有点太慢了 效率太低了？？

wei124

你用的是什么计算方法?是杜哈梅积分,还是数值积分?这个有些是需要收敛条件的.可以看看反应谱的理论.