2.5.3.5 Design membrane forces

Design membrane forces

The principal membrane forces ns_I,+z and ns_II,+z are now determined from the membrane forces n_sx,+z, n_sy,+z, and n_xy,+z that replace the moments m_x, m_y, m_xy and the axial forces n_x, n_y, n_xy of the linear plate analysis.

The design membrane forces can be determined from the principal membrane forces according to Equations 2.5 to 2.7. They can be found in the design details.

With the final design membrane forces ns_end,+z,φ1 and ns_end,+z,φ2, the program determines the required reinforcement areas of a two-directional reinforcement mesh for the surface side.

The reinforcement mesh is stiffened by a concrete compression strut. The magnitude of the stiffening strut force ns_end,+z,strut is specified under the final design membrane forces. It amounts to −219.846 kN/m.

Analogously, the design membrane forces and stiffening force of the concrete compression strut are determined for the top surface of the plate.