|l1,l2||Length of chord member AB and BC||P||Axial force on chord member AB and BC|
|β||Inclination of chord member in variable cross-section||M1||Bending moment of chord member AB at point A|
|M′1||Bending moment of web member AI at point A||M2||Bending moment of chord member AB at point B|
|M′2||Bending moment of web member BC at point B||M3||Bending moment of chord member BC at point C|
|M′3||Bending moment of web member CI at point C||θ1||Angle of chord member AB at point A|
|θ′1||Angle of web member AI at point A||θ2||Angle of chord member AB at point B|
|θ′2||Angle of chord member BC at point B||θ3||Angle of chord member BC at point C|
|θ′3||Angle of web member CI at point C||δ||Downward deflection of chord member ABC at point B|
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