A Treatise On Roofs And Bridges With Numerous Exercises
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To quickly assess the difficulty of the text, read a short excerpt:
Lower chords = 11.0, 20.0, 27.0, 32.0, 35.0, 36.0 tons.
Verticals =11.0, 9.0, 7.0, 6.0, 3.0, 2.0 tons.
Diagonals =15.5, 12.68, 9.86, 7.04, 4.22, 1.4 tons.
Of course the upper chord stresses can be written directly from those of the lower chord by (1) of Art. 5.
54 ROOFS AND BRIDGES.
Art. 20. Position of Uniform Live Load Causing Maximum Chord Stresses. — Let Fig. 27 be a truss sup- k Jl 13 6 S JO » Fig- sr f ported at the ends. Then to find the stress in any chord member, we pass a section cutt...ing that member, a web member, and the other chord, and take the center of moments at the intersection of the web member and the other chord; and since the lever arm for the chord is con- stant, tlie stress in any chord member will be greatest when the live load is so arranged as to give the greatest bending moment.
Now suppose we have a uniformly distributed moving load coming on the truss from the right, till it produces the left abutment reaction Bi; then any increase in the load on the right of the section N will affect the forces on the left only by increasing the reaction Ri, and consequently the bending moment.
What to read after A Treatise On Roofs And Bridges With Numerous Exercises?
You can find similar books in the "Read Also" column, or choose other free books by Edward a Edward Albert Bowser to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Lower chords = 11.0, 20.0, 27.0, 32.0, 35.0, 36.0 tons.
Verticals =11.0, 9.0, 7.0, 6.0, 3.0, 2.0 tons.
Diagonals =15.5, 12.68, 9.86, 7.04, 4.22, 1.4 tons.
Of course the upper chord stresses can be written directly from those of the lower chord by (1) of Art. 5.
54 ROOFS AND BRIDGES.
Art. 20. Position of Uniform Live Load Causing Maximum Chord Stresses. — Let Fig. 27 be a truss sup- k Jl 13 6 S JO » Fig- sr f ported at the ends. Then to find the stress in any chord member, we pass a section cutt...ing that member, a web member, and the other chord, and take the center of moments at the intersection of the web member and the other chord; and since the lever arm for the chord is con- stant, tlie stress in any chord member will be greatest when the live load is so arranged as to give the greatest bending moment.
Now suppose we have a uniformly distributed moving load coming on the truss from the right, till it produces the left abutment reaction Bi; then any increase in the load on the right of the section N will affect the forces on the left only by increasing the reaction Ri, and consequently the bending moment.
What to read after A Treatise On Roofs And Bridges With Numerous Exercises?
You can find similar books in the "Read Also" column, or choose other free books by Edward a Edward Albert Bowser to read onlineMoreLess
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