Fixed Beam Point Load Basics
A fixed beam has restrained rotation at both ends. A point load creates shear, bending moment, and deflection along the span. This calculator studies that behavior for construction checks. It is useful when a beam is cast into supports, welded to frames, or designed with full end fixity.
Why End Fixity Matters
Fixed ends reduce midspan deflection when compared with simple supports. They also create negative end moments. These moments must be checked with the same care as the positive moment near the load. Ignoring them can understate steel stress, reinforcement demand, or connection forces.
Main Inputs
Enter the service point load, total span, and load position from the left support. Add the elastic modulus and second moment of area. These values control stiffness. Add section modulus and allowable bending stress when a stress check is needed. The load factor helps review a stronger design case while keeping service deflection clear.
Reading The Results
The calculator reports left and right reactions, fixed end moments, moment at the load, maximum bending stress, and largest deflection. Reactions should add up to the factored point load. End moments are shown as hogging values. The largest absolute moment controls bending stress. The deflection ratio compares span against calculated movement.
Construction Use
Use the numbers for preliminary sizing, checking member options, and discussing connection demands. Treat the result as a calculation aid, not a final structural design. Real beams may include partial fixity, distributed loads, cracking, lateral torsional buckling, composite action, or local connection flexibility. Those effects can change the result.
Good Practice
Check all units before submitting. Use realistic support assumptions. Fixed supports need strong restraint, not only bearing. Compare stress with project limits. Compare deflection with the required span ratio. Recalculate when the load moves, the beam size changes, or material stiffness changes. Keep the downloaded report with your design notes for review.
Limitations To Remember
The formulas assume a straight prismatic beam, small deflection, linear elastic behavior, and one vertical point load. They do not include load combinations or code reduction factors. For important work, have a qualified professional review support stiffness, bracing, material grade, and connection detailing before construction begins on site or fabrication starts safely.