Hany Zadeh

Reinforced Concrete with FRP Bars: Mechanics and Design

The American Concrete Institute (ACI) Committee 440 fiber-reinforced polymer (FRP) reinforcement for concrete members is about to see full market acceptance and implementation after 22 years. This book is mainly intended for practitioners and the focus is on ACI technical literature that covers the fundamentals of performance and design of concrete members with FRP reinforcement and reinforcement detailing. The book is a valuable resource for researchers and graduate students to guide their studies and creative work. Only internal, nonprestressed FRP reinforcement are included in the book, prestressing and near-surface-mounted reinforcement applications are excluded. The authors of the book assume that the reader is already familiar with concrete as a material and reinforced concrete as a construction technology (i.e., fabrication, analysis, and design). The book is divided into three parts that are described to follow the typical approach to design of conventional reinforced concrete in detail. The first part of the book covers materials and test methods and the second part covers analysis and design. The third part of the book presents some design examples using a two-story medical facility as a case study.

In Situ Load Testing of a One-Way Reinforced Concrete Slab per the ACI 437 Standard

This paper describes the load test of a one-way reinforced concrete (RC) slab conducted according to the new ACI 437 load test standard and performed in a three-story apartment building constructed in 1947. The ACI 437 load test protocol and its acceptance criteria are reviewed and discussed. The experimental deflections measured during the load test are compared with the theoretical predictions provided by finite element method (FEM) analysis.

Strength Reduction Factor for Flexural RC Members Strengthened with Near-Surface-Mounted Bars

AbstractCurrent American Concrete Institute (ACI) guidelines for the design of flexural RC members strengthened with externally bonded fiber-reinforced polymer (FRP) systems assign an additional partial strength reduction factor to the contribution of FRP, marking a deviation from ACI’s approach in building codes. This conservative method finds its rationale in the novelty and the higher variability of FRP, because of its nature as a material (compared to steel) and the conditions of its installation (externally bonded). Using the case of near-surface-mounted (NSM) FRP bars, this paper demonstrates that a single strength reduction factor can be formulated, while maintaining the same reliability and safety required in conventional RC members. Using a comprehensive test matrix of flexural members processed with a computerized Monte Carlo simulation technique, the probabilistic implications of strengthening RC beams and slabs with NSM FRP bars are investigated. The generated statistical data are employed to ...

Incorporating Expected Life-Time into Live Load Factor for RC Structures Using Reliability Analysis

A method of reliability analysis is utilized to calibrate the live load factor based on the expected life-time of a cast-in-place reinforced concrete (RC) structure. The probabilistic parameters of live load are computed for different life-times and live load factors are then suggested so that the same level of safety is maintained for any given life-span. An example is presented that demonstrates how modified live load factors can be conducive to making decision on the necessity and the level of the required strengthening in a concrete structure in need of repair.

Numerical Approach to the Live Load Factor for RC Structures as a Function of Life-Time

The live load factor, as a function of the expected life-time, is computed for cast-in-place reinforced concrete elements (i.e., beam, slab and column) for a combination of dead and live loads. The accuracy of the reliability analysis is enhanced by taking advantage of the Rackwitz-Fiessler method which in turn is corroborated by Monte Carlo simulation applied to the calculation of the target reliability indices of each structural element type. As an example, the formulation of live load factor is reversed to demonstrate how the life-time or the probability of failure are affected as the actual design deviates from the requirements of the current building code.