winter-is-coming

Winter is Coming! Precautions for Cold Weather Concreting

Extreme weather conditions (extreme heat or cold; windy condition, and humidity variations) can significantly alter the quality of concrete. In cold weather concreting, one should make sure that all the negative impacts of low ambient temperature are appropriately alleviated by taking the necessary precautions. In this article, we will review important steps that can ensure Read more about Winter is Coming! Precautions for Cold Weather Concreting[…]

compressive_strength_of_concrete

How to Evaluate Compressive Strength of Concrete

What is the best method for the measurement of compressive strength of concrete? Testing cylinders and cubes in compression is the most convenient and well-known method for measuring the strength. The main question is if one can design and develop a method that can measure the strength faster, easier, and more accurate? Can all the Read more about How to Evaluate Compressive Strength of Concrete[…]

shear wall

Shear Wall Newsletter

Modeling Shear Walls Modeling Shear Walls Modeling shear walls have changes during the last two decades. Analyses techniques have moved from linear static to nonlinear dynamic, enabling more realistic modeling and simulations. Different approaches for modeling shear walls span from macro models such … Read more         Deficient Shear Walls Reinforced concrete shear Read more about Shear Wall Newsletter[…]

Model Structural Concrete

How to Model Structural Concrete?

Modeling concrete for structural properties can be quite challenging. Concrete is not a homogenous material; the placement and fabrication of concrete increases the degree of uncertainties, which makes it a complicated material . The question is how to model structural concrete? In this article, we will review some of the most well-known models. Model Structural Concrete Read more about How to Model Structural Concrete?[…]

shear wall

Major Techniques for Modeling Shear Walls

Modeling Shear Walls Modeling shear walls have changes during the last two decades. Analyses techniques have moved from linear static to nonlinear dynamic, enabling more realistic modeling and simulations. Different approaches for modeling shear walls span from macro models such as modified beam-column elements, to micro models such as 3D finite element models. An appropriate modeling Read more about Major Techniques for Modeling Shear Walls[…]

Deficient Shear Walls

Deficient Concrete Shear Walls

Reinforced concrete shear wall structures constructed in the 1970’s or earlier suffer from a number of deficiencies in design and detailing. This is around the time when seismic provisions emerged in the design codes, and changed the traditional strength-based design philosophy (EVOLUTION OF DESIGN CODES). In this article, we will briefly review common problems with deficient Read more about Deficient Concrete Shear Walls[…]

Design of Concrete Shear Walls

Concrete Shear Walls Reinforced concrete (RC) shear walls have long been recognized as suitable structural systems, providing both lateral resistance and drift control in RC buildings. However older shear walls were typically designed mainly for combined actions of gravity loads and wind loading with no special seismic load consideration. Seismic provisions were only introduces in Read more about Design of Concrete Shear Walls[…]

Modeling Existing Shear Walls

Modeling existing shear walls can be quite challenging. The first question to ask is how far we want to go – and how much we want to spend on- when it comes to modeling a wall structure. The modeling can be as simple as a beam-columns element, or as complex as a nonlinear 3D finite Read more about Modeling Existing Shear Walls[…]

Reinforced Concrete Shear Walls

The chapter on seismic behavior and retrofit of existing reinforced concrete shear walls is still wide open. Researchers and engineers around the world are trying hard to develop new materials and innovative techniques for seismic upgrade of concrete structures. But why is this so important? Reinforced concrete shear walls have long been recognized as suitable Read more about Reinforced Concrete Shear Walls[…]

Corroded Jetty in Harsh Marine Environment

Durability or Strength?

Durability or Strength? Can’t we have both? Are they actually the same? These are sort of questions I hear in the engineering offices. Structural engineers are normally interested in mechanical properties of concrete materials. For example, from an structural design perspective, compressive strength of concrete, yield strength of steel reinforcement, depth of rebar, or modulus Read more about Durability or Strength?[…]