{"appState":{"pageLoadApiCallsStatus":true},"articleState":{"article":{"headers":{"creationTime":"2016-03-26T21:19:32+00:00","modifiedTime":"2016-03-26T21:19:32+00:00","timestamp":"2022-09-14T18:09:58+00:00"},"data":{"breadcrumbs":[{"name":"Business, Careers, & Money","_links":{"self":"https://dummies-api.dummies.com/v2/categories/34224"},"slug":"business-careers-money","categoryId":34224},{"name":"Careers","_links":{"self":"https://dummies-api.dummies.com/v2/categories/34256"},"slug":"careers","categoryId":34256},{"name":"Trades, Tech, & Engineering Careers","_links":{"self":"https://dummies-api.dummies.com/v2/categories/34271"},"slug":"trades-tech-engineering-careers","categoryId":34271}],"title":"Statics: Developing Shear and Moment Diagrams","strippedTitle":"statics: developing shear and moment diagrams","slug":"statics-developing-shear-and-moment-diagrams","canonicalUrl":"","seo":{"metaDescription":"Shear and moment diagrams are a statics tool that engineers create to determine the internal shear force and moments at all locations within an object. Start by","noIndex":0,"noFollow":0},"content":"<p><i>Shear and moment diagrams</i> are a statics tool that engineers create to determine the internal shear force and moments at all locations within an object. Start by locating the critical points and then sketching the shear diagram.</p>\n<ul class=\"level-one\">\n <li><p class=\"first-para\"><b>Critical point locations:</b></p>\n <ul class=\"level-two\">\n <li><p class=\"first-para\">Start and stop of structure (extreme ends)</p>\n </li>\n <li><p class=\"first-para\">Concentrated forces</p>\n </li>\n <li><p class=\"first-para\">Concentrated moments</p>\n </li>\n <li><p class=\"first-para\">Start and stop of distributed loads</p>\n </li>\n <li><p class=\"first-para\">Internal hinges</p>\n </li>\n <li><p class=\"first-para\">Support locations</p>\n </li>\n <li><p class=\"first-para\">Points of zero shear (V = 0) — for moment diagrams only.</p>\n </li>\n </ul>\n </li>\n <li><p class=\"first-para\"><b>Important features to remember when drawing the diagram:</b></p>\n <ul class=\"level-two\">\n <li><p class=\"first-para\">Concentrated forces cause an instant jump in shear.</p>\n </li>\n <li><p class=\"first-para\">Concentrated moments cause an instant jump in moment.</p>\n </li>\n <li><p class=\"first-para\">Order increases from load to shear to moment (that is, 1st order load diagram, 2nd order shear, 3rd order moment).</p>\n </li>\n <li><p class=\"first-para\">The slope of the moment diagram is equal to the value of shear.</p>\n<img src=\"https://www.dummies.com/wp-content/uploads/203233.image0.jpg\" width=\"60\" height=\"46\" alt=\"image0.jpg\"/>\n </li>\n <li><p class=\"first-para\">If the load area is positive, the change in shear is positive. If the shear area is positive, the change in moment is positive.</p>\n </li>\n </ul>\n </li>\n</ul>","description":"<p><i>Shear and moment diagrams</i> are a statics tool that engineers create to determine the internal shear force and moments at all locations within an object. Start by locating the critical points and then sketching the shear diagram.</p>\n<ul class=\"level-one\">\n <li><p class=\"first-para\"><b>Critical point locations:</b></p>\n <ul class=\"level-two\">\n <li><p class=\"first-para\">Start and stop of structure (extreme ends)</p>\n </li>\n <li><p class=\"first-para\">Concentrated forces</p>\n </li>\n <li><p class=\"first-para\">Concentrated moments</p>\n </li>\n <li><p class=\"first-para\">Start and stop of distributed loads</p>\n </li>\n <li><p class=\"first-para\">Internal hinges</p>\n </li>\n <li><p class=\"first-para\">Support locations</p>\n </li>\n <li><p class=\"first-para\">Points of zero shear (V = 0) — for moment diagrams only.</p>\n </li>\n </ul>\n </li>\n <li><p class=\"first-para\"><b>Important features to remember when drawing the diagram:</b></p>\n <ul class=\"level-two\">\n <li><p class=\"first-para\">Concentrated forces cause an instant jump in shear.</p>\n </li>\n <li><p class=\"first-para\">Concentrated moments cause an instant jump in moment.</p>\n </li>\n <li><p class=\"first-para\">Order increases from load to shear to moment (that is, 1st order load diagram, 2nd order shear, 3rd order moment).</p>\n </li>\n <li><p class=\"first-para\">The slope of the moment diagram is equal to the value of shear.</p>\n<img src=\"https://www.dummies.com/wp-content/uploads/203233.image0.jpg\" width=\"60\" height=\"46\" alt=\"image0.jpg\"/>\n </li>\n <li><p class=\"first-para\">If the load area is positive, the change in shear is positive. If the shear area is positive, the change in moment is positive.</p>\n </li>\n </ul>\n </li>\n</ul>","blurb":"","authors":[{"authorId":10166,"name":"James H. Allen III","slug":"james-h-allen","description":"James H. Allen III, PE, PhD, is an assistant professor of civil engineering and a registered professional engineer. 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Statics: Developing Shear and Moment Diagrams

By: James H. Allen III and III and

Updated: 03-26-2016

From The Book: Statics For Dummies

Statics For Dummies

Explore Book Buy On Amazon

Shear and moment diagrams are a statics tool that engineers create to determine the internal shear force and moments at all locations within an object. Start by locating the critical points and then sketching the shear diagram.

Critical point locations:
- Start and stop of structure (extreme ends)
- Concentrated forces
- Concentrated moments
- Start and stop of distributed loads
- Internal hinges
- Support locations
- Points of zero shear (V = 0) — for moment diagrams only.
Important features to remember when drawing the diagram:
- Concentrated forces cause an instant jump in shear.
- Concentrated moments cause an instant jump in moment.
- Order increases from load to shear to moment (that is, 1st order load diagram, 2nd order shear, 3rd order moment).
- The slope of the moment diagram is equal to the value of shear.
- If the load area is positive, the change in shear is positive. If the shear area is positive, the change in moment is positive.

About This Article

This article is from the book:

Statics For Dummies ,

About the book author:

James H. Allen III, PE, PhD, is a registered professional engineer who teaches courses in the areas of statics, mechanics, structural engineering, and steel design.

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Trades, Tech, & Engineering Careers ,

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