I propose an enhancement in STAAD.Pro to simplify and automate the deflection check process for beam-type elements by facilitating the assignment of DFF , DJ1 , and DJ2 parameters, as well as the selection of appropriate load combinations for each deflection verification scenario.

The idea is to introduce a feature that allows the user, upon selecting multiple beam elements, to define in a grouped manner:

- The load combinations to be used for deflection checks.

- The deflection limit ( DFF ) value corresponding to each group of combinations.

- The automatic identification of the start and end nodes of each beam to correctly assign DJ1 and DJ2 , eliminating the need for manual input.

Additionally, it is important to consider that deflection checks are not carried out using a single DFF value, but rather different DFF values are required for different types of load combination groups , based on applicable design codes and project criteria (e.g., L/240 for gravitational loads, L/360 for service loads, L/500 for sensitive finishes, etc.).

This becomes especially critical in complex structural models with a large number of beam elements, where the current methodology—requiring manual definition of parameters for each element— becomes tedious, time-consuming, and error-prone , significantly reducing productivity and increasing the risk of inconsistencies.

Furthermore, an improvement is proposed in the output report generation:

Currently, the deflection check results are presented only as a ratio, without clearly showing the parameters used in the check. It is recommended that the output report explicitly include:

- The effective span length used ( L = DJ2 – DJ1 ),

- The deflection limit applied (based on the specified DFF , such as L/240 , L/360 , etc.),

- The specific load combination used for the deflection check.

This would enhance result traceability and allow easier validation and engineering review.

Key Benefits of the Proposal:

- Significant time savings in parameter assignment for multiple elements.

- Minimization of errors when assigning DJ1 and DJ2 manually.

- Greater flexibility to manage multiple deflection verification criteria.

- Support for checking different DFF values according to load combination types.

- Improved clarity and traceability in result outputs.

- Facilitates the handling of complex structures where the current workflow becomes inefficient and cumbersome.

Suggested Functionalities:

- Wizard or tool to select beam elements, define load combinations, and assign different DFF values by group.

- Automatic DJ1 and DJ2 assignment per element based on node positions.

- Option to save settings as reusable templates across different projects.

- Enhanced output reports detailing element span, applied DFF value, and the corresponding load combination used for each deflection check.