在basic选项卡中,excitations选择单向single direction,sumations选择square root of the sum of squares(SRSS)法,use response spectrum:sp(反应谱的name,后面再inp中添加),方向余弦(0,0,1),scale factor:1.
进入damping选项卡,阻尼使用直接模态(direct modal),勾选direct damping data,start mode:1,end mode:8,critical damping fraction:0.02.ok。
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(12)进入load模块,Load-->>create boundary condition,name:fixed,step选择initial,category选择mechanical,types选择displacement/ rotation,continue
选择0,0点,done,勾选u1~ur3所有6个自由度。Ok。
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(13)进入mesh模块,object选择part,点seed edge by number,选择所有杆,done,输入3,done
点assign element type
,选择全部杆,done,默认B31,ok。点mesh part,yes。
(14)进入job模块,name:demo-spc,source:model,continue,默认,ok。进入job manager,点击write input,在工作目录生成demo-spc.inp文件。
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(15)进入ABAQUS工作目录,使用UltraEdit软件(或其他类似软件)打开demo-spc.inp,*Boundary关键词的后面加如下根据问题叙述确定的反应谱:
*Spectrum,type=acceleration,name=sp 0.1543,0.167,0 0.1915,0.25,0 0.2102,0.333,0 0.2241,0.444,0 0.25,0.5,0 0.3295,0.667,0 0.4843,1,0 0.5987,1.25,0 0.7868,1.667,0 1.0342,2.222,0 1.0342,10,0 0.3528,10000,0
第一列为加速度,第二列为频率,第三列为阻尼比。
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