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S1=707N S2=-500N S3=-500N S1=1414 N S2=500N S3=1000N S1=-707N S2=500N S3=500N S1=-707N S2=1000N S3=500N
S1=707N S2=-500N S3=-500N S1=1414N S2=500N S3=1000N S1=-707N S2=500N S3=500N S1=-707N S2=1000N S3=500N
-1kN,-1kN 0,-1kN 1kN,1kN 1kN,0
S1=707N S2=-500N S3=-500N S1=1414N S2=500N S3=1000N S1=-707N S2=500N S3=500N S1=-707N S2=1000N S3=500N
上弦杆受压且其轴力随桁架高度h增大而减小 下弦杆受拉且其轴力随桁架高度h增大而减小 斜腹杆受拉且其轴力随桁架高度h增大而减小 竖腹杆受压且其轴力随桁架高度h增大而减小
S1=707NS2=-500NS3=-500N S1=1414NS2=500NS3=1000N S1=-707NS2=500NS3=500N S1=-707NS2=1000NS3=500N
S=-707N,S=500N,S=500N S=707N,S=-500N,S=-500N S=1414N,S=500N,S=1000N S=-707N,S=1000N,S=500N
S1=707N,S2=-500N,S3=-500N S1=1414N,S2=500N,S3=1000N S1=-707N,S2=500N,S3=500N S1=707N,S2=1000N,S3=500N
-1kN,-1kN 0,-1kN 1kN,1kN 1kN,0
-1kN,-1kN 0,-1kN tkN,1kN 1kN,0
S1=707N,S2=-500N,S3=-500N S1=1414N,S2=500N,S3=1000N S1=-707N,S2=500N,S3=500N S1=-707N,S2=1000N,S3=500N
S1=-707N,S2=500N,S3=500N S1=707N,S2=-500N,S3=-500N S1=1414N,S2=500N,S3=1000N S1=-707N,S2=1000N,S3=500N
S1=707N S2=-500N S3=-500N S1=1414 N S2=500N S3=1000N S1=-707N S2=500N S3=500N S1=-707N S2=1000N S3=500N
下弦杆受拉且其轴力随桁架高度h增大而减小 斜腹杆受拉且其轴力随桁架高度h增大而减小 上弦杆受压且其轴力随桁架高度h增大而减小 竖腹杆受压且其轴力随桁架高度h增大而减小
-1kN,-1kN 0,-1kN tkN,1kN 1kN,0
S1=-707N,S2=500N,S3=500N S1=707N,S2=-500N,S3=-500N S1=1414N,S2=500N,S3=1000N S1=-707N,S2=1000N,S3=500N
减少1,2杆的横截面面积 增大1,2杆的横截面面积 将1,2杆改为钢杆 将3杆改为钢杆