Adisorn O.

Adisorn Owatsiriwong, D.Eng. ALPS Consultants Introduction An underground water tank’s wall is a 2D structure that requires detailed analysis using design charts or sophisticated FEM modeling, e.g., SAP2000. This time-consuming process requires a structural engineer to model the tank geometry and provide triangular load definitions to the model. In this project, we use the Reisner-Mindlin plate element (Bathe, 1996; Bishoff, 2002) to develop a handy FEM tool for water tank analysis and...

Dynamic analysis of 3D building frames is computationally demanding, especially for multi-story and multi-bay frames. By applying Guyon reduction and rigid constraints, the analysis is highly efficient. Reduction Workflow Full 3D frame DOFs (As Static Analysis) → Guyan condensation to translational DOFs (Lateral mass only) → rigid diaphragm transformation → 3 DOF per floor Stage Main operation Resulting coordinates Full model Assemble K and M using all frame DOFs Nodal translations and...

Introduction Solving a dynamic system requires several time steps and is computationally demanding. The bending moment frame (Fig. 1a), while most common for static analysis, is inefficient for dynamic analysis, particularly for seismic analysis and structural design. Guyan (1965) proposed the reduction technique as an extension to static condensation to reduce the DOF with zero mass, i.e., at rotational dofs. (Adapted from Cimellaro and Marasco (2018)) Guyan Reduction By ignoring the...