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Inspection and Evaluation

Structural Effects of Corrosion

Structural Effects of Corrosion

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Share on linkedin Share on facebook Share on twitter Share on telegram Share on whatsapp Share on email Corrosion of steel reinforcement is often investigated in the context of the durability performance of the structure; however, corrosion can equally impact the structural performance. Steel corrosion may result in reduced flexural capacity (loss of rebar cross section), reduced bond, and limited ductility. In this article, we will review some of the… Read More »Structural Effects of Corrosion

shear wall

Major Techniques for Modeling Shear Walls

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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 technique should: Be capable of predicting the inelastic response   Incorporating important materials characteristics Simulate… Read More »Major Techniques for Modeling Shear Walls

Deficient Shear Walls

Deficient Concrete Shear Walls

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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

Deficient Concrete Shear Wall

Design of Concrete Shear Walls

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Share on linkedin Share on facebook Share on twitter Share on telegram Share on whatsapp Share on email 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 »Design of Concrete Shear Walls

What is Ground Penetrating Radar

What is Ground Penetrating Radar

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Ground Penetrating Radar (GPR) provides a cost-effective, nondestructive and reliable tool for scanning and imaging of sub-surface defects, voids, and objects. GPR was primarily developed and used in geophysics and geology for subsurface scanning and imaging. Since then, the method has been successfully adapted in many other disciplines including civil engineering. The multipurpose nature of ground penetrating radar and its broad range of applications, make it distinct from existing NDT… Read More »What is Ground Penetrating Radar

IOT - Intelligent Bridge Monitoring

Intelligent Bridge Monitoring

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Have you ever imagined what would happen if highway bridges could speak?: “That I broke an arm? That I have a steel tendon ruptured? …” Well, they are not too far anymore. Last week, I had the chance to participate in a presentation by Jacques Cartier and Champlain Bridges Incorporated (JCCBI) in the GTA, and learned about this smart instrumentation for stress/strain monitoring installed bridge girders. This helped bridge owners… Read More »Intelligent Bridge Monitoring

ASR-Corrosion

Corrosion in Concrete

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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

Numerical Modeling and Structural Evaluation

Modeling Existing Shear Walls

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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