Concrete Piles and drilled shafts are an important category of foundations. Despite their relatively high cost, they become necessary when we want to transfer the loads of a a heavy superstructure (bridge, high rise building, etc.) to the lower layers of soil. Another reason for choosing a pile foundation is the condition and quality of soil layers. Based on how they transfer the load into the subsoil, piles can be… Read More »Why and When to Use Concrete Piles?
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 concrete shear walls. The focus will be on concrete frame structures, with and without shear… Read More »Deficient Concrete Shear Walls
It is common to see map crack networks over the concrete elements of aged infrastructure along with leaching signs. It might be interesting to know that no structural collapse has been reported so far because of the ASR cracking in North America. However, the question arises as to whether it is required to manage ASR cracking within concrete structures. In this article, we will study the combined effect of corrosion… Read More »Corrosion in Concrete
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 element model. The design and detailing of reinforced concrete shear walls is a straight forward… Read More »Modeling Existing 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 structural systems, providing both lateral resistance and drift control in RC buildings. However these older… Read More »Reinforced Concrete Shear Walls