How to design Arch bridges for flexure

Description:
Dive into the complexities of curved structural members in building designs with our in-depth exploration. This video delves into the significant impacts of curvature on lateral-torsional buckling strength and how the AISC Specification Chapters B and F apply to these members. We offer a detailed analysis of first-order and second-order moments in simply supported beams, discussing the evaluation methods for moments in both undeformed and deformed geometries.
Discover how second-order moments in curved members can be accurately calculated through second-order analysis or by amplifying moments from a first-order analysis, adhering to the AISC Specification Appendix 8. Learn about the calculation of in-plane flexural strength, the application of amplification factors, and the crucial understanding of axial strength and elastic in-plane critical buckling load, as highlighted in our previous video (link in description).
We further explore the instability caused by flexure in the plane of curvature, noting the differences in buckling strength between members with closing and opening moments. The video explains the calculation of the elastic critical lateral-torsional buckling moment, developed length, and factors affecting the buckling strength in the presence of discrete bracing systems.
Understand the revised lateral-torsional buckling modification factor for curved members and how it considers the effects of curvature. For parabolically curved doubly symmetric members, we discuss the lateral-torsional buckling strength and the method for calculating an equivalent radius for accurate flexural strength estimates.
The video emphasizes the importance of calculating member strength under combined axial and flexural loads as per AISC Specification Chapter H and the verification of member strength along unbraced segments. The axial load variation and the selection of proper axial load ratios for in-plane and out-of-plane buckling are discussed in detail.
Additionally, we address the effects of cross-sectional distortion on flexural strength and stiffness in curved members, including the radial force distribution and its consequences on local bending and buckling. The video covers design models for unstiffened and stiffened elements, evaluating nominal flexural strength and the impact of longitudinal flexural stresses.
Explore the challenges of web bend-buckling in members with small-radius bends and the evaluation of nominal in-plane flexural strength for this limit state. We conclude with insights into the effects of ovalization on the strength and stiffness of straight and curved round HSS members and how to account for this phenomenon using effective parameters as per AISC specification section F.
For a comprehensive understanding of these advanced structural analysis concepts and their practical applications, ensure to watch our previous video for foundational knowledge (link below). Subscribe for more insightful content on structural engineering and stay updated on the latest analysis techniques and specifications.
Keywords: Curved Structural Members, Lateral-Torsional Buckling, AISC Specification, Second-Order Analysis, In-Plane Flexural Strength, Buckling Strength, Axial Load, Flexural Loads, Structural Engineering, AISC Appendix 8, Elastic Critical Buckling Moment, Discrete Bracing Systems, Axial Load Ratios, Cross-Sectional Distortion, Ovalization, Structural Analysis Techniques.
#StructuralEngineering #AISCSpecification #CurvedMembers #BucklingStrength #EngineeringAnalysis #FlexuralStrength #SecondOrderAnalysis #EngineeringEducation
🕒 Timelines:
00:00 Introduction
00:51 Difference between first and second order analysis
01:16 How to determine required moment and axial loads
02:14 Lateral Torsional buckling
02:48 Lateral Torsional buckling Method 1 for circular arches
03:40 Lateral Torsional buckling Method 2 for circular arches
04:30 Lateral Torsional buckling for parabolic arches
05:33 Combined flexural and axial loads
06:52 Distortion of unstiffened members
09:23 Distortion of stiffened members
09:56 Web buckling due to radial forces
10:26 Ovalization of round hollow sections due to radial forces
Relevant Videos:
Beam Design and Failure modes (AISC specification chapter F):
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Calculate in-plane and out-of-plane buckling strength of curved members
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AISC specification chapter H (combined flexural and axial loads)
• Mastering AISC Design:...
Understanding members under axial and flexural loads
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Understanding difference between 1st and 2nd order analysis
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