Four Span Continuous Beam - Equal Spans, Uniform Load on Two Spans
- See Article - Beam Design Formulas
Four Span Continuous Beam - Equal Spans, Uniform Load on Two Spans formula |
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R1=V1=0.446⋅w⋅L R2=0.572⋅w⋅L R3=0.464⋅w⋅L R4=0.572⋅w⋅L R5=−0.054⋅w⋅L V21=0.0554⋅w⋅L V22=V31=0.018⋅w⋅L V32=0.482⋅w⋅L V41=0.518⋅w⋅L V42=V5=0.054⋅w⋅L M1(0.446LfromR1)=0.0996⋅w⋅L2 M2(atR2)=−(0.0536⋅w⋅L2) M3(atR3)=−(0.0357⋅w⋅L2) M4(0.518LfromR4)=0.805⋅w⋅L2 M5(atR4)=−(0.0536⋅w⋅L2) Δmax(at0.477LfromR1)=0.0097⋅w⋅L4λ⋅I |
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Symbol | English | Metric |
Δ = deflection or deformation | in | mm |
w = load per unit length | lbf/in | N/m |
M = maximum bending moment | lbf−in | N−mm |
V = maximum shear force | lbf | N |
λ (Greek symbol lambda) = modulus of elasticity | lbf/in2 | Pa |
R = reaction load at bearing point | lbf | N |
I = second moment of area (moment of inertia) | in4 | mm4 |
L = span length under consideration | in | mm |
Diagram Symbols
Bending moment diagram (BMD) - Used to determine the bending moment at a given point of a structural element. The diagram can help determine the type, size, and material of a member in a structure so that a given set of loads can be supported without structural failure.
Free body diagram (FBD) - Used to visualize the applied forces, moments, and resulting reactions on a structure in a given condition.
Shear force diagram (SFD) - Used to determine the shear force at a given point of a structural element. The diagram can help determine the type, size, and material of a member in a structure so that a given set of loads can be supported without structural failure.
Uniformly distributed load (UDL) - A load that is distributed evenly across the entire length of the support area.
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