STAAD中MASS文件里的质量单位不是Pound么?怎么对不上呢。

我只建了一根500*500*1000mm的柱子,手算等效质量应该是625kg,但是STAAD中的结果是:------------------------------------------------

JOINT # DIRECTION Pound-mass(inch)
------- --------- = LBf/386.08858

1 X 1.819603
1 Z 1.819603

TOTAL MASS IN X-DIRECTION = 1.819603=LBf/386.08858
TOTAL MASS IN Y-DIRECTION = 0.000000=LBf/386.08858
TOTAL MASS IN Z-DIRECTION = 1.819603=LBf/386.08858


--------------------------------------------------

这个结果怎么换算呢?

附STAAD文件:
STAAD SPACE
UNIT METER KN
JOINT COORDINATES
1 -1.939 1.000 33.702;
2 -1.939 0.000 33.702;
MEMBER INCIDENCES
1 1 2;
DEFINE MATERIAL START
ISOTROPIC C30
E 3.000000e+007
POSSION 0.250000
DENSITY 25.000000
ALPHA 1.000000e-005
DAMP 0.050000
G 12000000.000000
END DEFINE MATERIAL
START USER TABLE
End
MEMBER PROPERTY CHINESE
1 -
PRIS YD 0.500000 ZD 0.500000

CONSTANTS
BETA 180.000000 MEMB 1
MATERIAL C30 MEMB 1
SUPPORTS
2 FIXED
CUT OFF MODE 10
LOAD 1 LOADTYPE Dead TITLE DeadLOAD
SELFWEIGHT Y -1
LOAD 2 EX AUTO RESPONSE SPECTRUM
*{ THE FIRST AUTO BUILD RESSPEC LOAD
*{ 力作用的方向与系数
*{ DIRECTION FACTOR : 1 1.00 0 1.00 1 1.00
*{ 是否考虑 Y 向自由度
*{ Y FREEDOM : 0
*{ 规范类型
*{ CODE TYPE : 3
*{ 地震类型(远、近或者多遇、罕遇)
*{ EQ TYPE : 2
*{ 地震迭加方法
*{ POST METHOD : 2
*{ 力的作用类型
*{ FORCE TYPE : 1
*{ 地震烈度
*{ EQ INTENSITY : 6
*{ 场地类别
*{ EARTH TYPE : 1
*{ 地震分组
*{ EQ GROUP : 1
*{ 是否地震加速度为0.15g、0.35g的地区
*{ SPECIAL ACCELERATE : 0
*{ 保存反应谱曲线的点的个数
*{ POINT NUMBER : 10
*{ 阻尼系数
*{ DAMPING FACTOR : 0.050000
*{ 比例系数,加速度时为9.8
*{ PROPORTION FACTOR : 9.800000
*{ 地震反应谱曲线上的点的数据(时间)
*{ POINT TIME : 0.000000 0.100000 0.200000 0.300000 0.400000 0.500000 0.600000 0.700000 0.800000 0.900000 1.000000 1.100000 1.200000 1.300000 1.400000 1.500000 1.600000 1.700000 1.800000 1.900000 2.000000 2.100000 2.200000 2.300000 2.400000 2.500000 2.600000 2.700000 2.800000 2.900000 3.000000 3.100000 3.200000 3.300000 3.400000 3.500000 3.600000 3.700000 3.800000 3.900000 4.000000 4.100000 4.200000 4.300000 4.400000 4.500000 4.600000 4.700000 4.800000 4.900000 5.000000 5.100000 5.200000 5.300000 5.400000 5.500000 5.600000 5.700000 5.800000 5.900000 6.000000
*{ 地震反应谱曲线上的点的数据(影响系数)
*{ POINT ALPHA : 0.018000 0.040000 0.040000 0.033900 0.026200 0.021400 0.018200 0.015800 0.014000 0.012600 0.011500 0.010500 0.009700 0.009400 0.009300 0.009200 0.009100 0.009000 0.009000 0.008900 0.008800 0.008700 0.008600 0.008600 0.008500 0.008400 0.008300 0.008200 0.008200 0.008100 0.008000 0.007900 0.007800 0.007800 0.007700 0.007600 0.007500 0.007400 0.007400 0.007300 0.007200 0.007100 0.007000 0.007000 0.006900 0.006800 0.006700 0.006600 0.006600 0.006500 0.006400 0.006300 0.006200 0.006200 0.006100 0.006000 0.005900 0.005800 0.005800 0.005700 0.005600
*{ 得到等效重力时的基本工况号及其系数
*{ LOADNO FACTOR : 1 1.0000
*{ 1.0000 * LOAD 1
MEMBER LOAD
SELFWEIGHT X 1
SELFWEIGHT Z 1
SPECTRUM CQC X 1 ACC SCALE 9.800000 DAMP 0.050000
0.000000 0.018000; 0.100000 0.040000; 0.200000 0.040000;
0.300000 0.033900; 0.400000 0.026200; 0.500000 0.021400;
0.600000 0.018200; 0.700000 0.015800; 0.800000 0.014000;
0.900000 0.012600; 1.000000 0.011500; 1.100000 0.010500;
1.200000 0.009700; 1.300000 0.009400; 1.400000 0.009300;
1.500000 0.009200; 1.600000 0.009100; 1.700000 0.009000;
1.800000 0.009000; 1.900000 0.008900; 2.000000 0.008800;
2.100000 0.008700; 2.200000 0.008600; 2.300000 0.008600;
2.400000 0.008500; 2.500000 0.008400; 2.600000 0.008300;
2.700000 0.008200; 2.800000 0.008200; 2.900000 0.008100;
3.000000 0.008000; 3.100000 0.007900; 3.200000 0.007800;
3.300000 0.007800; 3.400000 0.007700; 3.500000 0.007600;
3.600000 0.007500; 3.700000 0.007400; 3.800000 0.007400;
3.900000 0.007300; 4.000000 0.007200; 4.100000 0.007100;
4.200000 0.007000; 4.300000 0.007000; 4.400000 0.006900;
4.500000 0.006800; 4.600000 0.006700; 4.700000 0.006600;
4.800000 0.006600; 4.900000 0.006500; 5.000000 0.006400;
5.100000 0.006300; 5.200000 0.006200; 5.300000 0.006200;
5.400000 0.006100; 5.500000 0.006000; 5.600000 0.005900;
5.700000 0.005800; 5.800000 0.005800; 5.900000 0.005700;
6.000000 0.005600;
LOAD 4 EZ AUTO RESPONSE SPECTRUM
*{ AUTO BUILD RESSPEC LOAD
SPECTRUM CQC Z 1 ACC SCALE 9.800000 DAMP 0.050000
0.000000 0.018000; 0.100000 0.040000; 0.200000 0.040000;
0.300000 0.033900; 0.400000 0.026200; 0.500000 0.021400;
0.600000 0.018200; 0.700000 0.015800; 0.800000 0.014000;
0.900000 0.012600; 1.000000 0.011500; 1.100000 0.010500;
1.200000 0.009700; 1.300000 0.009400; 1.400000 0.009300;
1.500000 0.009200; 1.600000 0.009100; 1.700000 0.009000;
1.800000 0.009000; 1.900000 0.008900; 2.000000 0.008800;
2.100000 0.008700; 2.200000 0.008600; 2.300000 0.008600;
2.400000 0.008500; 2.500000 0.008400; 2.600000 0.008300;
2.700000 0.008200; 2.800000 0.008200; 2.900000 0.008100;
3.000000 0.008000; 3.100000 0.007900; 3.200000 0.007800;
3.300000 0.007800; 3.400000 0.007700; 3.500000 0.007600;
3.600000 0.007500; 3.700000 0.007400; 3.800000 0.007400;
3.900000 0.007300; 4.000000 0.007200; 4.100000 0.007100;
4.200000 0.007000; 4.300000 0.007000; 4.400000 0.006900;
4.500000 0.006800; 4.600000 0.006700; 4.700000 0.006600;
4.800000 0.006600; 4.900000 0.006500; 5.000000 0.006400;
5.100000 0.006300; 5.200000 0.006200; 5.300000 0.006200;
5.400000 0.006100; 5.500000 0.006000; 5.600000 0.005900;
5.700000 0.005800; 5.800000 0.005800; 5.900000 0.005700;
6.000000 0.005600;
PERFORM ANALYSIS PRINT ALL
FINISH

已邀请:

王华马头岗

赞同来自:

这里的386.08858是英制转化成公制的转化系数,此处考虑了两个系数:a.重力加速度9.8(m=G/9.8);2.inch到m的转化系数39.37,所以系数就是两者乘积386.08858.

zxq66dshun

赞同来自:

> super_james 发表于 2013-6-18 11:44 forum.php?mod=redirect&goto=findpost&pid=32065&ptid=7217
这里的386.08858是英制转化成公制的转化系数,此处考虑了两个系数:a.重力加速度9.8(m=G/9.8);2.inch到m的 ...


手算柱子的质量也是625kg, 这里的1.819603 怎么换算也不到600kg啊

王华马头岗

赞同来自:

地震作用下所有惯性加速度引起的等效质量

zxq66dshun

赞同来自:

> super_james 发表于 2013-6-18 12:10 forum.php?mod=redirect&goto=findpost&pid=32069&ptid=7217
地震作用下所有惯性加速度引起的等效质量


是啊,说的就是这个对不上啊,您可否说明是怎么换算的?

王华马头岗

赞同来自:

本帖最后由 super_james 于 2013-6-18 18:13 编辑

> okkeman 发表于 2013-6-18 12:37 http://aeclib.com/forum.php%3F ... D7217
是啊,说的就是这个对不上啊,您可否说明是怎么换算的?


等效质量与实际质量是两个概念,具体计算参考各振动力学参考书!(附件图片是一个简单的例子!)

要回复问题请先登录注册