Structural Calculations Explained

Depending on the project, checks can cover new floors, roof alterations, beams, columns, walls, connections, foundations and the stability of the overall building. Strength is not the only concern: excessive deflection, movement and vibration can affect finishes and usability.

The engineer must establish the existing structure and the proposed load path. Missing information may require a survey or opening-up, rather than an assumption that the building is conventional.

The package should identify member references, supports, bearings, connections and the construction assumptions used. The architectural plans should use the same references and levels so that beam positions, stairs, services and fire protection do not conflict.

A calculation showing that a beam is adequate does not prove that its masonry support or foundation is adequate. Check the interfaces and any exclusions, including delegated connection design or specialist systems.

The building control body needs enough information to assess compliance for the proposed work. That can include calculations, structural drawings, site investigation and product or system information, depending on complexity.

Submit coordinated revisions and respond to queries before relevant work proceeds. Building control review does not transfer the designer's responsibility to the authority and does not remove the contractor's duty to build safely and in accordance with the design.

If an opening grows, a bearing changes, existing construction differs or a contractor proposes a substitute, refer the change back to the engineer. Do not assume a larger-looking section or an extra support is automatically a safe equivalent.

Temporary propping, excavation support and erection stability need their own allocation of responsibility. Permanent calculations alone do not establish a safe method of construction.

Keep the final calculations, drawings, accepted revisions, relevant product information and inspection records. These help owners explain the work to future buyers, insurers and advisers.

Shorplans' architectural and structural coordination can help resolve interfaces early. Ask the written appointment to identify which investigations, structural design services, site visits and specialist work are included.