Prestressed Precast Beam & Culvert Cover Design

Request a Prestressed Beam Design

We design pretensioned precast concrete beams and prestressed culvert-cover units for highway, drainage and structural applications. Our calculations follow the member from strand release through the lifting and transport stages to the final in-service condition, verifying the anchorage zone, flexure, shear, deflection and bearing for the specified span and load.

3D model of a 12 m long precast prestressed culvert-cover slab with end cross-sections.

The design checks we perform

Prestress losses and service stresses: We calculate transfer and effective prestress after all losses and verify concrete fibre stresses at transfer and in service against the code tension and compression limits.
Ultimate flexural capacity: We confirm the factored moment capacity, including the stress in the bonded strands at ultimate, against the design moment envelope.
Shear and web design: We design for ultimate shear, combining the concrete and prestress contribution with any shear reinforcement required away from the ends.
End-block / anchorage zone: We check bursting and spalling in the anchorage (transmission) zone and detail end-zone reinforcement to control transfer stresses.
Deflection and camber: We calculate camber at transfer and long-term deflection under sustained and live load to confirm serviceability.
Bearing and support reactions: We verify bearing stresses and support reactions, including the temporary saddle / support reactions used during handling and storage.
Lifting and handling: We check lifting points, dynamic effects and member stresses during demoulding, stacking and erection.

Reinforcement and Strand Profile

Flexure Check at Final Service (ACI 318-19)

Flexure design-check chart for a precast prestressed beam to ACI 318-19, comparing factored moment with design moment capacity along the span.

Precast Culvert Slab Layout

Plan layout of precast culvert cover slabs showing the cast-in-situ shaft line, slab marks and dimensions.

Governing standards and how we apply them

ACI 318-19: Primary code for prestressed flexure and shear strength, serviceability stress limits and anchorage-zone detailing.
Eurocode (EN 1992-1-1): Applied where European practice is specified, including its prestress, shear and serviceability provisions.
PCI: Followed for prestressed beam handling, camber and bearing design practice.

Why choose Precasterz for prestressed beam design

Stage-by-stage verification: We check transfer, handling and in-service separately, because the critical stresses in a prestressed member often occur at release and lifting, not only under final load.
Anchorage-zone detailing: We give proper attention to bursting and end-zone reinforcement, the area most often under-detailed in prestressed members.
Span and section optimisation: We tune the strand pattern and section to the span and loading to deliver an efficient, castable beam.