Influence Line and Envelope Curve Calculator for Continuous Beam
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Hypotheses

Calculation assumptions adopted in the analysis

I.

Moving unit load

The influence-line analysis is performed by considering a unit point load moving along the entire length of the continuous beam.

II.

Navier–Bernoulli beam theory

The beams are assumed to be sufficiently slender conforming to the Navier–Bernoulli beam theory. Consequently, shear deformation is assumed to be relatively small compared to the flexural deformation and is therefore neglected in the analysis.

III.

First-order linear analysis

The structural response is evaluated using first-order linear analysis, assuming a linear force–displacement relationship. Geometric nonlinearities and second-order effects are not considered; therefore, the calculations are intended for beams for which stability effects do not significantly influence the structural response.

1

Characteristic of the continuous beam

Define the length and the relative stiffness for each span

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SpanLength L (m)Relative stiffness K

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Calculation type

Select the calculation you want to perform.