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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Events > Conventions > Current Convention > Sessions and Events
C = Duke Energy Convention Center; H = Hyatt Regency Cincinnati
MINI SESSION: Reliability and Safety of New and Rehabilitated Concrete Structures
Mon, October 21, 2019 1:30 PM - 2:30 PM, C- 233
Many codes rely on the use of structural reliability and safety approaches to design or assess new and existing concrete structures. The acceptability criterion is the target reliability index, as reliability is considered as a rational measure of structural performance. Although there are guidelines to help engineers to obtain this information, there is a lack of knowledge of formal education in this subject. The objective of the proposed session is to present the structural reliability concepts that can be easily understood by the practitioner. The presence of uncertainties in materials properties, geometries, predictive models, loads, etc., will be discussed. Paper on evaluation methods, prediction models, reliability analysis, and code calibration will also be presented. Learning Objectives:(1) Recognize the impact of structural reliability and its application on new and existing concrete structures;(2) Identify potential evaluation methods and strategies for rehabilitate concrete structures; (3) Discover the importance of other limit states that may impact the service life of the structures;(4) Explain structural reliability basics and its application on quantifying structural performance.
Challenges in the Safety Assessment of Existing Reinforced Concrete Columns Strengthened by FRP
Presented By: Sofia Maria Diniz
Affiliation: Federal University of Minas Gerais
Description: There is an increasing importance of the topic of strengthening of existing structures and infrastructures. This fact is corroborated by different reports, e.g. the 2017 ASCE Infrastructure Report Card. Concrete is the most used construction material in the world; as a result, among those structural elements in need of repair/strengthening are reinforced concrete (RC) columns. Utilization of FRP jackets in the confinement of RC columns, --as a means to increase strength and ductility--, has received large attention from both the academia and practitioners. However, a number of challenges exist in the assessment of safety of RC columns strengthened by FRP. In this presentation we discuss the main challenges related to this assessment and the implementation of provisions regarding strengthening techniques in design standards following semi-probabilistic formats.
Probabilistic System-level Performance Evaluation for Reinforced Concrete Frame Buildings
Presented By: YeongAe Heo
Affiliation: Case Western Reserve University
Description: In this presentation, a new methodology to estimate system-level damage of multi-story RC frame buildings based on the constitutive-level responses is explained, which is necessary to quantify structural risks. Nonlinear dynamic FE simulations are performed using OpenSees for 100 near-fault and far-field ground motions for two different 12-story RC frames, one designed to a new building code and the other designed to an old building code. A weighting factor concept is used to estimate multi-scale damage (e.g. constitutive level, member level, story level and system level). This new damage estimate will be compared to the existing structural performance metrics such as inter-story drift ratios and plastic rotations. Also, main finding will be discussed on fragility curves of these two buildings at different damage states.
Parameterized Fragility Models Towards Hurricane Risk Assessment of Concrete Structures
Presented By: Georgios Balomenos
Affiliation: McMaster University
Description: Past events triggered the development of fragility models for concrete structures subjected to hurricane-induced surge and waves. However, parameterized fragility models were lacking for a range of different configurations to enable rapid application across a region or to explore climate change effects on damage risks. Thus, this study first assesses the fragility of concrete structures subjected to storm surge and waves through the development of parameterized fragility models; then incorporates these models in a case study along the Texas coast in order to evaluate damage risks for alternative storm and sea level projections. The derived parameterized fragilities express the failure probability given structural characteristics, in addition to hurricane intensity measures, with the aim to advance risk assessment of ports and bridges exposed to natural hazards. Finally, the presented models can also support reliability assessment of new and existing concrete structures across a region which can be of interest to designers and risk managers looking to mitigate hurricane damage.