Lesson 36 Approximate Methods-portal method
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Lesson 36 Approximate Methods-portal method

Course Number: CE 311, Fall 2009

College/University: Lafayette

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CE311 Fall 2008 Lesson 36: Approximate Methods The Portal Method "When I read about the evils of drinking, I gave up reading." - Henny Youngman Empire State Building: Completed 1931 LESSON 36 APPROXIMATE METHODS THE PORTAL METHOD Monday, November 17, 2008 LESSON OBJECTIVES 1. List the assumptions of the portal method. 2. Solve a rigid frame by the portal method. 3. Alter the basic Portal...

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2008 Lesson CE311 Fall 36: Approximate Methods The Portal Method "When I read about the evils of drinking, I gave up reading." - Henny Youngman Empire State Building: Completed 1931 LESSON 36 APPROXIMATE METHODS THE PORTAL METHOD Monday, November 17, 2008 LESSON OBJECTIVES 1. List the assumptions of the portal method. 2. Solve a rigid frame by the portal method. 3. Alter the basic Portal assumptions when the foundation is pinned, partially fixed, or the beam is replaced by a truss. (from the reading). BONUS FRIDAY Attend the Third Annual Lehigh-Lafayette Steel Bridge Presentation to the Alumni at 7pm in room 327 Friday and receive eight homework bonus points. Food will be provided (sadly, not pot roast). The seniors will present their steel bridge design to the alumni and to anyone else who is willing to sit quietly and listen in order to get free food. There is also the possibility of burning the 2008 Third Place Plaque as some sort of "never again" statement to the Steel Gods. First Exact Method to Analyze Rigid Frames for Wind: Invented 1932 How was it analyzed? Approximate Methods (of course, before 1932, they weren't called Approximate Methods. They were just called Methods) READING Lesson 36 Reading Handout: Hibbeler sections 7.4 and 7.5. Note: this reading is good background, but the author does things "the long solving way", every free-body diagram. That's fine. It works. But, as I've shown in class, the "better procedure" enables you to solve the frame without showing every free body diagram. HOMEWORK (DUE MONDAY NOVEMBER 24 ) 1. Use the portal method to draw the moment diagram for girder KLMNO and Column AFKP for the wind loading. All foundations and connections are rigid, except those indicated (foundations at D and E, beam-ends for IJ, NO, ST). TH 2. From the previous, what is the axial force in column AF, due to the wind loading? CE311 Fall 2008 Lesson 36: Approximate Methods The Portal Method Lesson 36 Reading Handout: from RC Hibbeler Structural Analysis CE311 Fall 2008 Lesson 36: Approximate Methods The Portal Method CE311 Fall 2008 Lesson 36: Approximate Methods The Portal Method CE311 Fall 2008 Lesson 36: Approximate Methods The Portal Method CE311 Fall 2008 Lesson 36: Approximate Methods The Portal Method CE311 Fall 2008 Lesson 36: Approximate Methods The Portal Method CE311 Fall 2008 Lesson 36: Approximate Methods The Portal Method CE311 Fall 2008 Lesson 36: Approximate Methods The Portal Method CE311 Fall 2008 Lesson 36: Approximate Methods The Portal Method CE311 Fall 2008 Lesson 36: Approximate Methods The Portal Method CE311 Fall 2008 Lesson 36: Approximate Methods The Portal Method

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