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Formwork for Concrete Structures by R.L.Peurifoy and G.D- By EasyEngineering.net

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xiv

Contents

Minimum Lateral Force for Design of

Slab Form–Bracing Systems . . . . . . . . . . . . . . . . . . 363

References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 364

12 Patented Forms for Concrete Floor Systems . . . . . 365

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 365

Ceco Flangeforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . 365

Adjustable Steel Forms . . . . . . . . . . . . . . . . . . . . . . . . 366

Ceco Longforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 367

Ceco Steeldomes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 369

Ceco Fiberglassdomes . . . . . . . . . . . . . . . . . . . . . . . . . 370

Ceco Longdomes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 370

Plastic Forms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 371

Corrugated-Steel Forms . . . . . . . . . . . . . . . . . . . . . . . 373

Cellular-Steel Floor Systems . . . . . . . . . . . . . . . . . . . . 373

Selecting the Proper Panel Unit for Cellular-Steel

Floor Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 374

Horizontal Shoring . . . . . . . . . . . . . . . . . . . . . . . . . . . 375

References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 379

ww.EasyEngineering.n

13 Forms for Thin-Shell Roof Slabs . . . . . . . . . . . . . . . 381

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 381

Geometry of a Circle . . . . . . . . . . . . . . . . . . . . . . . . . . 381

Example 13-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . 382

Locating Points on a Circle . . . . . . . . . . . . . . . . . . . . . 383

Elevations of Points on a Circular Arch . . . . . . . . . . 385

Example 13-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . 386

Forms for Circular Shell Roofs . . . . . . . . . . . . . . . . . . 386

Design of Forms and Centering for a Circular

Shell Roof . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 387

Space the Joists . . . . . . . . . . . . . . . . . . . . . . . . . 387

Space the Ribs . . . . . . . . . . . . . . . . . . . . . . . . . 388

Design the Ribs . . . . . . . . . . . . . . . . . . . . . . . . 388

Determine the Load on the Shores . . . . . . . . 390

Determine the Elevations of the Top of

the Decking . . . . . . . . . . . . . . . . . . . . . . . . . 391

Determine the Slope of the Decking at the

Outer Edges . . . . . . . . . . . . . . . . . . . . . . . . . 391

Centering for Shell Roofs . . . . . . . . . . . . . . . . . . . . . . . 391

Use of Trusses as Centering . . . . . . . . . . . . . . . . . . . . 392

Decentering and Form Removal . . . . . . . . . . . . . . . . 394

14 Forms for Architectural Concrete . . . . . . . . . . . . . . . 395

Forms for Architectural versus Structural

Concrete . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 395

Concrete Coloring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 396

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