我用STAAD做钢结构分析,发现第2和5根梁(对称)存在抗剪能力不足的问题,可是我
发现这两个梁的剪力都只有大约650kN,而W14x1049梁的实际抗剪能力应该有大约680kN,
所以系数应该小于1(安全)的,可是STAAD计算的结果是这个系数为1.07(不安全)。
本来是很简单的结构,不知道什么地方我的计算没有考虑到,请大家帮忙看看。下面是
STAAD文件命令,谢谢!
STAAD PLANE
START JOB INFORMATION
ENGINEER DATE 21-Mar-13
END JOB INFORMATION
INPUT WIDTH 79
UNIT MMS MTON
JOINT COORDINATES
1 0 1635.6 0; 2 2957.4 1635.6 0; 3 3452.7 1635.6 0; 4 4825.1 0 0;
5 3452.7 -1635.6 0; 6 2957.4 -1635.6 0; 7 0 -1635.6 0; 8 2957.4 0 0;
MEMBER INCIDENCES
1 1 2; 2 2 3; 3 3 4; 4 4 5; 5 5 6; 6 6 7; 7 2 8; 8 8 6; 9 4 8;
DEFINE MATERIAL START
ISOTROPIC STEEL
E 20.9042
POISSON 0.3
DENSITY 7.83341e-009
ALPHA 1.2e-005
DAMP 0.03
TYPE STEEL
STRENGTH FY 0.0351 FU 0.0456 RY 1.5 RT 1.2
END DEFINE MATERIAL
MEMBER PROPERTY AMERICAN
1 TO 8 TABLE ST W14X109
MEMBER PROPERTY AMERICAN
9 PRIS YD 25.4 ZD 323.9
CONSTANTS
MATERIAL STEEL ALL
SUPPORTS
1 7 FIXED
LOAD 1 LOADTYPE Dead TITLE YOKELOAD
JOINT LOAD
4 FX 200
PERFORM ANALYSIS PRINT STATICS LOAD
PERFORM ANALYSIS PRINT ALL
PRINT PROBLEM STATISTICS
PRINT ANALYSIS RESULTS
PRINT MEMBER STRESSES ALL
PARAMETER 1
CODE AISC
FYLD 0.0351 ALL
FU 0.045645 ALL
LY 3453 MEMB 1 2 5 6
LZ 2957 MEMB 1 6
KZ 1.5 MEMB 1 2 5 6
KY 2 ALL
LY 3271 MEMB 7 8
LZ 1636 MEMB 7 8
KZ 2 MEMB 3 4 7 TO 9
LY 1867 MEMB 9
LZ 1867 MEMB 9
LY 2135 MEMB 3 4
LZ 2135 MEMB 3 4
CHECK CODE MEMB 1 TO 8
FINISH