تحلیل تقریبی عملی تیرها و قاب‌ها: یادداشت‌های درسی در مکانیک ۱

Sponsored By The Engineering Mechanics Institute Of Asce Practical Approximate Analysis Of Beams And Frames Presents A New Method For Structural Engineers To Approximately Analyze The Mechanics Of Beams And Frames. The Approach, Which Complements The Results Produced By Computer Software, Can Be Used To Sketch Deflected Shapes And To Estimate Moment Diagrams, Deflections, Influence Lines, And Moments Of Inertia, As Well As To Establish A Framework For Nondestructive Evaluation Of Framed Structures. This Method Is Relatively Short And Simple, Robust With Good Accuracy, Memorable, And Applicable To Practical Problems. With This Approximate Analysis Method, Engineers Sketch The Deformations Of Beams And Frames, With An Emphasis On Qualitative Precision. The Resulting Sketches Reveal The Behavior Of Structures In A Visually Rich And Informative Way. One Advantage Of This Method Is That It Localizes All Dimensional Quantities In A Few Factors, So That Only Relative Stiffness Parameters Need To Be Estimated. Each Chapter Contains Examples Of This Method Applied To Produce Summaries And Ranges Of Behavior In A Wide Variety Of Realistic Situations. For Practicing Structural Engineers, The Methods In This Book Are An Illuminating And Time-saving Addition To Traditional Computer Calculations. For Engineering Students, These Methods Emphasize The Conceptual Aspects Of Mechanical Analysis, Supplementing Their Training In Structural Analysis Software Programs. Cover 1 Contents 6 Preface 10 1 Approximate Analysis of Beams and Frames with no Sidesway 14 1.1 Introduction to Sketching 14 1.2 Passive Members in Continuous Beams and Frames 17 1.3 Beam with a Moment Applied at One End and Resisting at the Other 24 1.4 Example: Continuous Beam with Moment Applied at Only One Node 29 1.5 Outline of Approximate Method for Analyzing Structures with No Sidesway 33 1.6 Beam with a Uniform Load 35 1.7 Example: Uniform Load 52 1.8 Beam with a Point Force 55 1.9 Example: Point Force 79 1.10 Comments and Examples on Multiple Loads 83 1.11 Beam with Two or More Internal Hinges 91 1.12 Beam with One Internal Hinge, a Moment Applied at One End and Resisting at the Other 99 1.13 Beam with One Internal Hinge and a Uniform Load 106 1.14 Beam with One Internal Hinge and a Point Force 110 2 Approximate Analysis of Frames with Sidesway 116 2.1 The Cantilever and the Single Floor Portal Frame 116 2.2 Approximate Analysis of Single Floor Frames Subject to a Horizontal Load 126 2.3 Sketching Single Floor Portal Frames 135 2.4 The Column with Rotary Springs and Moments at Both Ends 142 2.5 Approximate Analysis of Multiple Floor Frames Subject to Horizontal Loads 152 2.6 A Note on the Lumped Mass Model for Buildings 163 2.7 Sketching Multiple Floor Frames Subject to Horizontal Loads 171 2.8 Notes on Sidesway Due to Vertical Loads or Applied Couples 182 3 Estimating Displacements in Beams and Frames 196 3.1 Maximum Vertical Displacements in Beams 196 3.2 Estimating Moment of Inertia 202 3.3 Relative Vertical Displacements versus Strain in Beams 213 3.4 Side Displacements of Frames Subject to Side Loads 221 3.5 Obtaining Rotary Stiffness Factors from Slope Measurements in Beams 235 4 Approximate Influence Lines for Indeterminate Beams 244 4.1 Introduction to Influence Lines 244 4.2 Exact Influence Lines for Statically Determinate Beams 251 4.3 Approximate Influence Lines for Statically Indeterminate Structures 279 Appendixes 326 A: Beams—End-Moments and Inflection Points 326 A.1 Moment End-Loaded Beam 326 A.2 Uniformly Distributed Load 328 A.3 Point Force 330 B: Column—Shear Stiffness, End-Moments and Inflection Points 336 B.1 Cantilever 336 B.2 Column for Single Story Building 337 B.3 Column for MultiStory Building—First Floor 339 B.4 Column for MultiStory Building—Top Floor (Top and Bottom Beams Similar) 341 B.5 Column for MultiStory Building—General Case 342 C: Beams—Deflections and Rotations 344 C.1 Displacements at Any Location 344 C.2 Rotations at Any Location 347 C.3 Uniform Load—Mid Displacements 349 C.4 Point Force—Centrally Loaded—Mid Displacements 351 C.5 Point force—Loaded Anywhere—Mid Displacements 353 C.6 Point Moment—Loaded Anywhere—Mid Displacements 356 C.7 Cantilever—Various Special Cases—Displacements 359 D: Useful Results for Influence Lines 362 D.1 Influence Lines for Vertical Force Reactions 362 D.2 Influence Lines for Shear Forces 364 D.3 Influence Lines for Bending Moments 364 D.4 Transition Member 366 Index 368 A 368 B 369 C 369 D 370 E 370 F 371 H 371 I 372 L 372 M 375 N 376 O 381 P 381 R 382 S 383 T 390 U 390 V 391 W 391 Z 391 The new series, produced by the Engineering Mechanics Institute, is designed to transcend the conventional division of mechanics and provide a forum for state-of-the-art research that tackles the range of complex issues facing society today. The emphasis is on the rapid dissemination of original reports and surveys, though all the material will be peer reviewed for accuracy, and indexed to serve as a repository. Fares begins with a volume presenting a new approach to the approximate analysis of beams and frames. The approach complements the use of software but provides a critical role for the structural engineer at a higher conceptual level where humans are good at recognizing visual and other patterns. The book could be used in a second course on structural analysis, he says, but only in conjunction with other texts. Annotation ©2012 Book News, Inc., Portland, OR (booknews.com) LNMech 1 presents a new method for structural engineers to approximately analyze the mechanics of beams and frames, complementing the results produced by computer software.