Spanmaat

Spanmaat is a Dutch technical term used in civil engineering and architectural planning to denote the length of a span—the distance between two supports or fixed points in a structure such as a bridge, roof, or beam. The word combines span (the distance between supports) with maat (measurement), and it is commonly employed in design, documentation, and construction planning to specify the required or actual span length.

In practice, spanmaat is a key parameter that influences structural behavior, including load distribution, moments, and selection of materials. Designers use spanmaat together with other dimensions and load assumptions to determine member sizes, connection details, and construction sequencing. It is especially relevant in multi-span structures, where each consecutive pair of supports defines a separate span and thus its own spanmaat.

Measurement conventions typically involve specifying the distance between the centerlines of the supports (center-to-center). In some contexts, span measurements may also be given as the face-to-face distance between the inner faces of supports. The chosen convention should be stated in project drawings or specifications to avoid ambiguity.

Spanmaat is one of several related dimensions used in structural planning, alongside overall length, height, and spacing of supports. It is essential for accurate fabrication, budgeting, and compliance with design codes. See also span (engineering), structural design, and bridge engineering.