Tilt-up walls are thin concrete panels. When a slender wall is subjected to axial compression and out-of-plane bending, second order effects must be considered. ACI 318 permits an amplified first order approach, elastic second order approach, or inelastic second order approach. ACI 318 also provides an alternative analysis for slender walls which is an amplified first order approach and is the basis of ACI 551.2R. RAM Structural System has implemented an elastic second order analysis to handle the slender wall problem.

In addition to the elastic second order analysis, several features where implemented to facilitate the in-place analysis and design of tilt-up structures in a 3D model.

• Distributed wall self-weight
• Gaps (joints) can be assigned to provide analytical separation from adjacent panels
• Assignment of eccentricity parameter for automatic application of out-of-plane gravity moments
• Pressure loads on walls
• Mechanism to isolate out-of-plane behavior
• Asymmetrical wall reinforcement for different cover on interior and exterior faces
• Net section consideration for reveals