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Structures with Prof. H
United States
Registrace 22. 04. 2021
I'm Dr. Brock Hedegaard, and I'm a professor of civil engineering at the University of Minnesota Duluth. I feature tutorials on finite element analysis (FEA), structural analysis, reinforced concrete, and structural design. Whether you are a graduate student entering their first foray into FEA, an undergraduate taking an introduction to structural analysis, or even a professional studying for the PE exam, I aim to provide useful content for your engineering education.
Deflection of Reinforced Concrete Beams - Example using ACI 318-19
This video presents an example problem for calculating the immediate live load deflections of a reinforced concrete beam according to ACI 318-19. The effective moment of inertia for the beam, which has changed in the most recent version of the code, is computed for dead only and dead + live loading. The service-load displacements are computed, and then the appropriate ACI 318-19 deflection limit is checked.
Chapters:
0:00 Introduction
0:34 Serviceability
1:26 Beam Stiffness
3:51 Permissible Deflections
4:57 Example Problem
6:04 Step 1 - Uncracked Section
7:52 Step 2 - Cracked Section
13:42 Step 3 - Effective Moment of Inertia
17:07 Step 4 - Deflections
19:26 Step 5 - Check Permissible
Chapters:
0:00 Introduction
0:34 Serviceability
1:26 Beam Stiffness
3:51 Permissible Deflections
4:57 Example Problem
6:04 Step 1 - Uncracked Section
7:52 Step 2 - Cracked Section
13:42 Step 3 - Effective Moment of Inertia
17:07 Step 4 - Deflections
19:26 Step 5 - Check Permissible
zhlédnutí: 15 153
Video
Flat Roof Snow Loads using ASCE 7-22
zhlédnutí 4,1KPřed rokem
On Tuesday, March 14, the roof collapsed on the Miller Hill Mall in Duluth, Minnesota, under snow loading. How much snow did that roof carry at collapse, and what are the current design standards for computing the flat roof snow load? This video shows an example of how to compute the flat roof snow load prescribed by ASCE/SEI 7-22. Exposure and thermal factors are discussed, as is use of the AS...
Shear Design Example - Reinforced Concrete Beams using ACI 318-19
zhlédnutí 30KPřed rokem
This video presents a complete example problem for conducting the shear design of reinforced concrete beams according to ACI 318-19. First, the demands are computed using a shear envelope. Then the proper shear limits are checked to ensure the beam dimensions are allowable and that the proper stirrup spacing is selected. Finally stirrup spacing is computed along the length of the beam to satisf...
I Broke These Concrete Beams - Design Principles from Beam Failures
zhlédnutí 639KPřed rokem
I constructed six reinforced concrete beams in the lab and then loaded them to failure. What can we learn about reinforced concrete behavior and good design principles from these tests? Two of the beams exhibited flexural failures with lots of flexural cracking and ultimate crushing of the concrete in compression. Two beams had traditional shear failures, with a diagonal crack extending through...
Shear Capacity of Reinforced Concrete Beams using ACI 318-19
zhlédnutí 8KPřed rokem
Shear capacity of reinforced concrete beams has changed from ACI 318-14 to the latest code edition, ACI 318-19. The detailed method is no more, and significant changes have been made the concrete term Vc. This video gives an overview of shear in reinforced concrete beams, highlights the changes in the concrete Vc term, and reviews the steel stirrup contribution Vs. Two example problems are comp...
Structural Analysis using ETABS - Fundamentals
zhlédnutí 2,8KPřed rokem
In this tutorial, we learn how to use ETABS, a structural analysis and building design software package. ETABS has a lot to offer, so this video focuses on learning the basics of how to define a model, apply loads and load combinations, and interpret the analysis results. We first define material and section properties. Then we draw the two-dimensional truss model. Finally, we place point and d...
Concrete Beam Design 101 - Tension Reinforcement
zhlédnutí 9KPřed rokem
Learn how to find the required amount of steel to carry the moment demand in a reinforced concrete beam. This video presents two different methods for estimating the steel area: a ballpark method, and a more exact stress ratio method. After introducing these principles, a full design example problem is shown. ACI 318-19 provisions are all satisfied for the minimum area of steel, bar spacing, an...
Moment Capacity of Reinforced Concrete Beams
zhlédnutí 4,4KPřed rokem
The nominal moment capacity of a concrete beam can be calculated using the Whitney Stress Block approximation (also known as the Equivalent Rectangular Stress Block). This is done to average the nonlinear concrete stresses at the ultimate state. This video also shows how to find the curvature, steel strain, and strength-reduction (phi) factor. Chapters: 0:00 Intro 1:01 Derivation of Capacity 5:...
Transformed Sections and Cracked Moment of Inertia
zhlédnutí 5KPřed rokem
Once a reinforced concrete beam is cracked, the section reduces dramatically from the gross moment of inertia to the cracked moment of inertia. This cracked section is active from the cracking moment up until the yielding moment, when the steel yields. Computing the cracked moment of inertia is important for finding deflections of concrete beams under service loads. Chapters: 0:00 Introduction ...
Cracking Moment of Reinforced Concrete Beams - Gross Section vs Transformed Section
zhlédnutí 4,1KPřed rokem
In this video, we focus on the first uncracked phase of bending in a reinforced concrete beam. We compute the cracking moment and curvature and cracking using two different approximations: (1) Gross section - ignore the steel, use concrete only (2) Transformed section - transform the steel area into equivalent concrete area The gross section approximation is often used in design, as it is close...
Concrete, Steel, and Why They Work Well Together
zhlédnutí 6KPřed 2 lety
Concrete and steel reinforcement combine into reinforced concrete, one on the most popular building systems on the planet. What makes these materials such a dynamic duo? In this video, we learn about the stress-strain properties of concrete and steel, and why they complement each other. We then see how longitudinal reinforcement helps carry moments and transverse reinforcement (stirrups) helps ...
How do structures carry wind and seismic loads? An Intro to Lateral Force Resisting Systems
zhlédnutí 12KPřed 2 lety
Buildings carry lateral (i.e., horizontal) loads through lateral force resisting systems. This video introduces the three most common systems: (1) Braced frames (2) Moment frames (3) Shear walls The lateral force resisting system does not need to cover the entire structural system, but lateral loads do need to be able to transfer from their point of application to the LFRS. Chapters: 0:00 Intro...
Approximate Beam Analysis - The Art of Being Close Enough
zhlédnutí 3,5KPřed 2 lety
This video is the first in a series on approximate structural analysis. Approximate analysis is valuable for checking results from an indeterminate or computer analysis. It is also very useful for multiple choice exams, such as the FE and PE exams - getting a quick answer that is close enough can eliminate incorrect solutions or even hone in on the correct answer. This first video focuses on in...
Direct Analysis Method for Steel Buildings using RISA 3D
zhlédnutí 3,1KPřed 2 lety
This video illustrates the process for conducting the Direct Analysis Method for steel structures per the 15th Edition of the AISC Steel Construction Manual (AISC 360-16, Specifications for Structural Steel Buildings, Chapter C). This video performs design according to LRFD, though the ASD procedure is similar. The primary benefit of performing structural analysis per the Direct Analysis Proced...
Slope-Deflection Equations for Indeterminate Structures - Intro to Structural Analysis
zhlédnutí 2KPřed 2 lety
Slope-Deflection Equations for Indeterminate Structures - Intro to Structural Analysis
Force Method for Indeterminate Structures - Intro to Structural Analysis
zhlédnutí 10KPřed 2 lety
Force Method for Indeterminate Structures - Intro to Structural Analysis
Deflection of Beams using Moment-Area Method - Intro to Structural Analysis
zhlédnutí 42KPřed 2 lety
Deflection of Beams using Moment-Area Method - Intro to Structural Analysis
Deflection of Frames using Principle of Virtual Work - Intro to Structural Analysis
zhlédnutí 7KPřed 2 lety
Deflection of Frames using Principle of Virtual Work - Intro to Structural Analysis
Deflection of Trusses using Principle of Virtual Work - Intro to Structural Analysis
zhlédnutí 6KPřed 2 lety
Deflection of Trusses using Principle of Virtual Work - Intro to Structural Analysis
Design Envelopes for Worst-Case Demands with Movable Live Loads
zhlédnutí 2,1KPřed 2 lety
Design Envelopes for Worst-Case Demands with Movable Live Loads
Muller-Breslau Principle for Influence Lines - Intro to Structural Analysis
zhlédnutí 15KPřed 2 lety
Muller-Breslau Principle for Influence Lines - Intro to Structural Analysis
Influence Lines and Moving Loads - Intro to Structural Analysis
zhlédnutí 14KPřed 2 lety
Influence Lines and Moving Loads - Intro to Structural Analysis
Projected Loads and Snow Loads - Intro to Structural Analysis
zhlédnutí 15KPřed 2 lety
Projected Loads and Snow Loads - Intro to Structural Analysis
Axial, Shear, and Moment Diagrams in Frames - Intro to Structural Analysis
zhlédnutí 66KPřed 2 lety
Axial, Shear, and Moment Diagrams in Frames - Intro to Structural Analysis
Stress, Internal Forces, and Shear and Moment Diagrams - Intro to Structural Analysis
zhlédnutí 5KPřed 2 lety
Stress, Internal Forces, and Shear and Moment Diagrams - Intro to Structural Analysis
Truss Analysis - Intro to Structural Analysis
zhlédnutí 5KPřed 2 lety
Truss Analysis - Intro to Structural Analysis
Determinate vs Indeterminate Structures - Intro to Structural Analysis
zhlédnutí 79KPřed 3 lety
Determinate vs Indeterminate Structures - Intro to Structural Analysis
Gravity Load Systems, Tributary Area, and Influence Area - Intro to Structural Analysis
zhlédnutí 10KPřed 3 lety
Gravity Load Systems, Tributary Area, and Influence Area - Intro to Structural Analysis
Intro to Structural Analysis - Loads and LRFD
zhlédnutí 3,6KPřed 3 lety
Intro to Structural Analysis - Loads and LRFD
Concrete Microplane Model - FEA using ANSYS - Lesson 10
zhlédnutí 16KPřed 3 lety
Concrete Microplane Model - FEA using ANSYS - Lesson 10