What does a Structural Engineer do?

When preliminary design work is finished,  and the size and shape of the home is set,  the structural engineer gets to work. They tabulate the vertical loads of building materials, occupants, and contents of the structure, and then they select the appropriate sizes and strengths of the building's supporting members. The path of vertical loads is traced (roof, floor, columns, footings), to the supporting soil. They establish and design the limits which prevent the wall finishes and ceilings from cracking. The structural engineer also works with geotechnical engineers to limit the settling of a structure over time.

While it's critical to measure and assess vertical loads, a structure's lateral load is important as well.  Using applicable building codes, the structural engineer matches forces with resisting elements from the peak of the roof to the bottom of the sturture's footings. Walls are checked to assure that they support both the load from the floors above and gusts from severe winds and storms. Structures are bolted form their foundations to resist the lateral sliding forces of earthquakes.   Through careful calculations, a structure becomes a logical mathematical proof where all forces cancel.

The structural engineer is responsible for translating his or her calculations into construction drawings for use by the contractor. Plan views of the individual building levels are then developed. Details of the various connections are created and cited on the plans. Specifications for the structural materials and required inspections are added to complete the work. No variations that affect the building's performance escapes the scrutiny of the structural engineer.