Elementary Theory and Calculation of Iron Bridges and Roofs

9th bay abutments applied beam bending braced arches bridge is fully calculations central span centre chains considered dead load deflection equal equation of moments equilibrium evidently find the stress following equations force H fully loaded girder shown given in Fig gonals greatest stresses h₁ H₂ half Hence hinge hinge-reaction horizontal bars horizontal reactions kilos lattice girders live load load produces load Q loading boundary lower boom lower bow lower joints M₁ maximum method of moments millimetre minimum stress moving load multiplied negative obtained parabolic girder permanent load pier positive resultant ribs rods roof section line shown in Fig stress produced structure substituting suspension bridge taking moments temperature tons top joint truss U₁ U₂ uniformly distributed unit of length unloaded upper joints V₁ V₂ vertical forces vertical reaction weight X₁ X₂ Y₁ Y₂ Z₁ Z₂