diff options
Diffstat (limited to '3776/CH11/EX11.11')
| -rw-r--r-- | 3776/CH11/EX11.11/Ex11_11.sce | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/3776/CH11/EX11.11/Ex11_11.sce b/3776/CH11/EX11.11/Ex11_11.sce new file mode 100644 index 000000000..510361b42 --- /dev/null +++ b/3776/CH11/EX11.11/Ex11_11.sce @@ -0,0 +1,59 @@ +clear +// +P = 200.0 //K The force on the beam +L = 15 //ft - The length of the rod +F_y = 50.0 //ksi +F_a = F_y/(5.0/3) //ksi -AISC MANUAL ,allowable axial stress if axial force is alone +F_b = F_a //Allowable compressive bending stress +M_1 = 600.0 //k-in - The moment acting on the ends of the rod +M_2 = 800.0 //k-in - the moment acting on the other end of teh rod +B_x = 0.264 //in - Extracted from AISC manual +E = 29*(10**3) +A = P/F_a + M_2*B_x/F_b //in2- The minimum area +printf("\n \n The minimum area is %0.2f in^2",A) +//we will select W10x49 section +A_s = 14.4 //in2 - The area of the section +r_min = 2.54 //in The minimum radius +r_x = 4.35 //in +f_a = P/A_s //Ksi- The computed axial stress +f_b = M_2*B_x/A_s //Computed bending stess +C_c = ((2*(%pi**2)*E/F_y)**0.5) //Slenderness ratio L/R +C_s = L*12/r_min // Slenderness ratio L/R of the present situation +if C_s <C_c then + printf("\n The following approch is solvable") +else + printf("\n The caliculation is not possible") + end +F_a_1 = 19.3 //Ksi - AISC lets try this +c_m = 0.6 - 0.4*(-M_1/M_2) +F_e = (12*(%pi**2)*E)/(23*(L*12/r_x)**2) +k = f_a/F_a_1 + c_m*f_b*(1-(f_a/F_e))/F_b //Condition mentioned in AISC +if k>1 then + printf("\n The following W10x49 section is not satisfying our constraints since f_a/F_a_1 + c_m*f_b*(1-(f_a/F_e))/F_b %0.3f >1",k) +else + printf("\n The following W10x49 section is satisfying our constraints since f_a/F_a_1 + c_m*f_b*(1-(f_a/F_e))/F_b %0.3f <1",k) + end +//trail - 2 +//Lets take W10 x 60 +A_s = 17.6 //in2 - The area of the section +r_min = 2.57 //in The minimum radius +r_x = 4.39 //in +f_a = P/A_s //Ksi- The computed axial stress +f_b = M_2*B_x/A_s //Computed bending stess +C_c = ((2*(%pi**2)*E/F_y)**0.5) //Slenderness ratio L/R +C_s = L*12/r_min // Slenderness ratio L/R of the present situation +if C_s <C_c then + printf("\n The following approch is solvable") +else + printf("\n The caliculation is not possible") + end +F_a_1 = 19.3 //Ksi - AISC lets try this +c_m = 0.6 - 0.4*(-M_1/M_2) +F_e = (12*(%pi**2)*E)/(23*(L*12/r_x)**2) +k = f_a/F_a_1 + c_m*f_b*(1-(f_a/F_e))/F_b //Condition mentioned in AISC +if k>1 then + printf("\n The following W10x49 section is not satisfying our constraints since f_a/F_a_1 + c_m*f_b*(1-(f_a/F_e))/F_b %0.3f >1",k) +else + printf("\n The following W10x49 section is satisfying our constraints since f_a/F_a_1 + c_m*f_b*(1-(f_a/F_e))/F_b %0.3f <1",k) + end +printf("\n small variation due to rounding off errors")
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