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

A technical blog on automated reinforced concrete drilled pier design using strain compatibility and interaction diagram checking Introduction Drilled piers are commonly used as deep foundations for buildings, bridges, industrial structures, retaining systems, and heavy equipment foundations. In many practical projects, drilled piers are subjected not only to axial compression but also to bending moment from lateral loads, column eccentricity, seismic effects, wind, or constr

Nonlinear dynamic analysis plays an important role in seismic performance evaluation of structures. The solution of nonlinear dynamic can be solved by using Newmarks's method. This article provides a 1-DOF cookbook for review purposes and to provide basic knowledge for multi-DOF problems. The algorithm consists of Newmark loop and Newton loop as Time Integration (Newmark) └── for each time step └── Newton Iteration └── Stress Return Mapping

Adisorn Owatsirwong, D.Eng. This equivalent nodal force is opposite to Fixed-end reactions and written in the element force calculation as follows. {Fe} = [ke]{u} - {q} {q} = Equivalent nodal force When assembling the element stiffness, those {q} are summed into the global load vector {F}, i.e. {F} + {Q}= [K]{u} [F] = Nodal applied load {Q} = Sum of equivalent nodal load vector [K] = The global stiffness of the structure MATLAB Code (case qe = q) function feq = eqv_load_dro

Shear reinforcement in a concrete beam is required when the shear strength of concrete alone is inadequate to carry the vertical shear from external loads. ACI 318 stipulates the general equation for computing the vertical shear strength of a concrete beam with inclined stirrups as follows. Vs = As*fy*d/s*(sin(a) + cos(a)) where a = horizontal angle of the inclined stirrup It's first astonishing to see the term cos(a) for the shear strength of the stirrup, which should only b

Artificial Intelligence is being advanced to the point where engineering design can be automated to an unprecedented extent. Within a...

*Auto Generated by GPT-5 1. Steel and Concrete Frame Design Objectives: Minimize material cost (steel weight, concrete volume). Minimize...

We mostly recall that M = M_primary + M2, but here is a simpler explanation that can be made, so we don't just memorize the math. 1....

This document explains the step-by-step procedure to compute the transformation matrix for a 3D frame element that includes a section...

Here we show the real example of reinforced concrete corbel to carry a total load of 900 kN, i.e. 4 points of 225 kN. The STM model is...

reference: (PDF) Strut-and-Tie-Modeling in Reinforced Concrete Structures Basics and Applications

1. Introduction Plastic analysis provides a powerful tool for estimating the collapse load of structures by using either the lower bound...

% Beam parameters fc = 30; % MPa fy = 500; % MPa Es = 200000; % MPa b = 300; % mm d = 550; % mm dp = 50; % mm Mu = 400e6; % N.mm phi =...

Ref. ETABS's SWD ACI318-99 Manual Based on the Shear Wall Design Manual (ACI 318-19) , the Simplified C- and T-section shear wall design...

In the field of nonlinear structural analysis, the term 'geometric stiffness' has long been used to describe the additional terms that...

Inclined 2-Bar Truss with Geometric Nonlinearity and Transformation Matrix This example models a 2-bar inclined truss using the Updated...

This workbook builds a nonlinear axial truss model using the Newton-Raphson method and a bilinear elastic-plastic material model. It...

In the seismic design of tall buildings with podiums or basements, the structure typically consists of a flexible tower built over a...