BEAM DESIGN OF COMPOSITE BEAM AND SLAB SECTIONS FOR SAGGING AND HOGGING MOMENTS DESIGN | X01
Summary The beam module allows you to design a composite section for flexure. Composite construction methods are becoming more popular globally due to the rapid construction potential and efficient use of materials. The module forms part of the PROKON structural analysis and design suit together with the three other composite design modules.
What makes this module special?
• Design a section for sagging and hogging moments and for shear • Various deck layouts are supported • Design checks indicate which failure mode governs • Detailed equations
Detailed Description A composite beam is usually a combination of a steel I-beam and a concrete slab cast on top. Shear connectors are welded to the top flange of the steel beam to ensure that the composite action is possible. Composite construction reduces the construction timeline because the contractors don’t have to wait for concrete beams to reach the required 28-day strength before removing formwork. With good planning, formwork can be avoided entirely, which allows for massive savings. The composite beam section design module allows you to design a composite section for flexure and shear. The module considers the case of sagging as well as hogging moments.
BEAM DESIGN OF COMPOSITE BEAM AND SLAB SECTIONS FOR SAGGING AND HOGGING MOMENTS DESIGN | X01
Various deck layouts are possible: 1. No deck 2. Flat deck 3. Ribbed parallel to beam
4. Ribbed perpendicular to beam 5. Corrugated parallel to beam 6. Corrugated perpendicular to beam
The module reads sections from the PROKON® Section Database which contains the steel sections used in most countries.
Theory used in this module The module calculates the sagging and hogging resistance of composite beam sections according to rigid-plastic theory in Section 6 of EN 1994-1-1:2004 (Eurocode 4). It can evaluate both full shear connection and partial shear connection designs using plastic theory. The module verifies that the section is either a Class 1 or a Class 2 section as required for rigid-plastic theory design. It accounts for longitudinal reinforcement in compression (if present) for sagging resistance with the assumption that such reinforcement is fully anchored. To calculate the plastic bending resistance of the section, the module determines the plastic neutral axis (PNA) location of the section. It does this by balancing the contributing horizontal forces (based on plastic stresses) in the composite cross- section. In the shear connection calculations, the module checks headed studs for adherence to the ductility requirements for steel sections with equal flanges. It also checks resistance to vertical shear.
BEAM DESIGN OF COMPOSITE BEAM AND SLAB SECTIONS FOR SAGGING AND HOGGING MOMENTS DESIGN | X01
BEAM DESIGN OF COMPOSITE BEAM AND SLAB SECTIONS FOR SAGGING AND HOGGING MOMENTS DESIGN | X01
Supported Codes
Design Codes
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AISC 360 – 16 (LRFD) Eurocode 4 – 2004 SANS 10162-1:2011
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