LL Response
The live load response is calculated based on influence line loading algorithms.
The truck is moved forward and backward over the entire length of the bridge.
The lane load per CHBDC 3.8.3.3 is placed on positive or negative patches of the influence line. It is applied over a width of 3.0 m.
| Dynamic Load Allowance | The dynamic load allowance is given by CHBDC 3.8.4.5.3. |
| Application Factors | Live load effects of amplification for transverse variation in maximum longitudinal moment or shear intensity and dynamic loading are as per CHBDC 5.7.1. |
| Live Load Response | The truck and lane responses are combined to obtain the total response due to the live load. Each live load can have any number of trucks and only one lane load. |
| Deflection |
All live load deflection responses are calculated based on deflection influence lines. The vertical deflection and the rotation are adjusted by the following factors: |
| Forces | Live load forces (shear, axial, moment) are obtained by using the force influence lines and applying the appropriate dynamic load allowance and reaction factors. |
| Stresses | All live load stresses are obtained by calculating the force enveloped (maximum and minimum axial and moment) and the stresses using the cross section properties at the POI. |
| Reactions | All live load reactions are calculated by using reaction influence lines. Reaction factors are used for vertical and moment reactions. |