These videos are part of a lecture on Fundamental Concepts for Structural Design and Evaluation delivered during the Training Program on Seismic Evaluation of Existing Buildings & Nonlinear Modeling Procedures using ETABS, conducted by CSI Bangkok and AIT Solutions from 13-17 January 2025.
1. Overcoming Limitations of Strength Based Design
This lecture segment looks into the limitations of traditional strength-based design methods in structural engineering. It explores the challenges of accurately predicting deflection, stress, and strain under various loads, emphasizing the need for more detailed investigations beyond code-based procedures.
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2.From Strain to Loads – Alternative Approach for Design and Investigation of RC Structures
This video discusses an alternative approach to designing and investigating reinforced concrete (RC) structures by shifting from traditional force-based methods to a strain-driven capacity calculation.
Dr. Naveed introduces four key structural mechanics concepts—stress, strain, force, and displacement—and explains their interrelations. The conventional force-to-stress approach is critiqued for its limitations in nonlinear behavior. Instead, the strain-to-load method
is described, allowing for a more reliable structural capacity determination by first analyzing material response. This material capacity and failure criterion method provides a clearer understanding of RC behavior, eliminating assumptions and ensuring accurate evaluation of safety factors. The discussion also covers moment-curvature relationships and practical applications, emphasizing how this approach improves structural assessment
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3.Significance of Moment-Curvature Curve in Response Investigation
This video discusses the significance of the moment-curvature curve in evaluating structural response. The curve provides critical information, including cracking, yield, and ultimate points, as well as ductility and stiffness properties.
A key takeaway is that real stiffness, including material and section nonlinearity, is best derived from the moment-curvature relationship rather than traditional elastic formulas.
It also highlights how different stiffness definitions—initial, secant, and tangent—affect numerical modeling and convergence in different software. The discussion explores how moment-curvature data aids in calculating deflection, rotation, and crack width, ensuring a comprehensive structural investigation.
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4. Design & Non-Linear Static Investigation of Simple Frames
In this video, Dr. Anwar presents an in-depth explanation of the traditional design and nonlinear static investigation of simple frames. He explains how conventional elastic analysis fails to capture material and geometric nonlinearities, making nonlinear modeling essential.
Using ETABS, he demonstrates the complete workflow from conventional modeling to reinforcement detailing workflow.
The discussion covers the role of stiffness at different structural levels and the challenges of nonlinear equilibrium calculations and highlights pushover analysis as a key tool for understanding structural capacity.
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5. Effect of Confinement on Response of RC Sections
In this video, we explore how confinement influences axial flexural response of reinforced concrete (RC) section and why code based ultimate strength design methods can be insufficient. Nonlinear cross-section analysis helps account for these effects by modifying stress-strain relationships due to transverse reinforcement improving structural assessment.
The presentation highlights how confinement changes RC behavior, making structures stronger and more ductile, and how the cracking factors in design codes are inconsistent, leading to potential errors in analysis. It also describes how Nonlinear modeling enhances accuracy, helping engineers assess real structural capacity.
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6.How Non-Linearity Affects the Lateral Response of Frame
This presentation talks about how non-linearity influences the lateral response of frame structures, particularly in seismic conditions. Nonlinear effects modify equilibrium equations, which impact response calculations. The presentation also discusses how modal analysis helps assess structural behavior by identifying stiffness irregularities and mass participation.
The video highlights how higher-mode effects alter shear and moment demand, influencing seismic performance, especially in tall buildings, and touches upon significance of response spectra, foundation modeling, and the role of risk-based assessment in structural evaluation.
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7. Seismic Evaluation and Significance of Modal Response
In this video, Dr. Naveed highlights the crucial role of modal response in seismic evaluation and structural performance. Modal analysis acts as the “heartbeat” of a structure, revealing stiffness irregularities, mass participation, and potential weaknesses—especially in tall buildings. The talk highlights that the higher-mode effects increase the shear demand, making nonlinear dynamic analysis essential. It also describes how integrating non-linearity and dynamic effects into equilibrium equations, engineers can achieve more accurate response determination for seismic evaluation.
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8.Key Performance Indicators for Structural Evaluation and Evaluation
This video talks about key performance indicators (KPIs) for evaluating structural performance. It outlines ten essential KPIs, including stiffness, strength, deformation, and ductility, linking them to their contributing factors like material properties and geometry. In his presentation, Dr. Anwar emphasizes diagnosing structural issues at the root cause and prioritizing global solutions before local fixes to improve cost-effectiveness. A retrofitting strategy matrix can be introduced to map solutions like shear walls and base isolators to specific performance improvements.
The video also highlights the role of AI and data-driven methods in enhancing structural evaluation and decision-making.
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