pcitemsVOLUME 16/NUMBER 3/MARCH 1970

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PRESTRESSED CONCRETE INSTITUTE j~-,d c’f I,Editor: Robert C. Eaman ~ ~...1u0~ria ~ui ~ings

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Prestressed concreteoffers seven ways tosuccess in industrialbuilding designWhat determines a successful i dustrialbuilding?

If a building designer can incorporatethe following characteristics into thestructure, the chances of it being a“successful” building are high:• Low cost—prestressed concrete

is able to provide savings in constructiontime, on-site labor, maintenance, andinsurance costs, and often n initialmaterial costs.• Rapid construction time—precast

or prestressed concrete will expediteconstruction time because it is cast inthe plant while the site is prepared. Afterit is in place, other work can proceedimmediately.• Minimum maintenance—concrete’s

unique strength, durability and resistanceto corrosive forces give it a higher wear-and-tear threshold.• Production flexibility—Precast

concrete elements are ideally adaptableand the long clear spans attainable allowa wide range of production layouts.• Efficient space use—prestressed

concrete roofs and frames providing longclear spans result in wide column spacingswith unobstructed floor areas.• Fire resistance-Concrete is the most

fire resistant material, and no insulationsneed be attached. This means lowerfire insurance rates.

• Pleasant working conditions—Highworker morale is maintained by theinfinite variety of precast concretetextures, colors, shapes, and designs.

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THE COVER illustrates the Scott Foresman& Co. office and warehouse, Atlanta,Georgia. The project is featured onpage 5 of this issue.

Exhaust TowersMotorola IntegratedCircuits CenterMesa, Arizona

Four standard prestressed concrete single teesfor each of three exhaust towers at Motorola’sIntegrated Circuits Center form an estheticand beneficial solution to discharging exhaustinto the atmosphere.

Each of the 34-ft. long tees are erected onend flange-to-flange to form a square shaftthrough which the purified exhaust flows. Thetowers are tall enough so the air exhaustedcan be dissipated into the atmosphere.

White cement, white sand, and white quartzaggregate were used in the tees, which werethen sandblasted to expose the quartz.

Architects: Varney, Sexton, Sydnor, Associates; StructuralEngineer: Magadini and Associates; General Contractor:T. C. K. Construction Co.; Prestressed Concrete: UnitedMetro Materials & Concrete Co., Inc.

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Baking Plant, American Bakeries CompanyCharlotte, North Carolina

American Bakeries Co.’s 175,000-sq. ft. bakingplant in Charlotte is built totally of precastand prestressed concrete elements.

The framing plan is a simple precast columnand beam system. Used in conjunction withthe prestressed concrete double and single teeroof and office floor system, it allows greaterspacing between columns to meet therequirements of the plant layout.

In addition, precast concrete double teesand flat panels are used to form attractiveexterior walls.

Precast and prestressed concrete was usedin the building fora number of reasons. Forone, speed of construction obtainable with thismaterial enabled large spaces to be coveredquickly. This expedited the whole constructionprocess, thereby reducing costs and gettingthe client into the building sooner.

The roof had to be designed for heavy loadsdue to various types of mechanical equipmentit had to carry. According to the architects,“the roof system works very well due to theinherent ability of prestressed concrete to span

great depths and carry heavy loads.”The exterior wall components function as

shear walls for lateral building support.The architects also used prestressed concrete

because it provides a ledge-free structure,easing maintenance and sanitation.

Part of the program for the plant calls forit to be expanded. The precast components onthe exterior can be reused at that time.

Architects-Engineers: Stevens & Wilkinson; GeneralContractor:]. A. Jones Construction Co.; PrecastPrestressed Concrete: Concrete Materials Inc.

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Warehouse and Office BuildingLiquor Control Board of OntarioLondon, Ontario, Canada

A completely precast prestressed concrete warehouseand office has been built for the Liquor Control Boardof Ontario.

Precast concrete columns and V-beams support 298prestressed concrete single tees forming the warehouseroof and 120 prestressed double tees forming theoffice roof. Precast fascia and wall panels combinewith other miscellaneous precast units to fashionthe exterior of the building.

Precast prestressed concrete was chosen primarilyto achieve long clear spans, allowing free storage andtraffic areas, and to provide uncluttered surfaces freeof projecting connections, ledges, and braces.

Special split precast columns and V-beams aredesigned to conceal all mechanical and electricalinstallations inside. This protects these componentsfrom normal traffic in the warehouse and facilitatesclear, unobstructed movement under beams andstacking close to columns.

The warehouse is 500-ft. long and divided into80-ft. bays, with column spacing every 20 ft. The splitcolumns support inverted V-beams, which in turnsupport 80-ft. long, 10-ft. wide single tees. The wallsare precast, exposed aggregate panels 10-ft. wideand 221/2~ft. high. The panels may be removed forfuture expansion of the building.

Architects: Hicks, Marsh & McLean; Structural Engineer:B. A. Hastings Ltd.; General Contractor: Ellis-Don Ltd.;Precast Prestressed Concrete: Pre-Con Ltd.

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Warehouse and Office Building

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Scott Foresman and Company, Atlanta, GeorgiaAn almost totally precast prestressed concreteoffice and warehouse has been built forScott Foresman & Co. in Atlanta.

Prestressed double tees 8-ft. wide and22-in, deep span over the 40,000-sq. ft.warehouse and clerestory portion of theoffice. Double tees 14-in, deep cover thelower portion of the office roof.

The frame of the warehouse consists ofprestressed concrete columns along thetwo side walls and double tee girders erectedstems up. Double tee wall panels are hungfrom these girders. This arrangement allowsremoval and reuse of the panels duringexpansion.

Along the front and back walls of thewarehouse, the 8-ft. wide double tee wallpanels are load bearing. The panels are 28-ft.10-in, tall. A ledge to carry the roof tees iscast in the back of the panels.

The office is framed with prestressed

concrete columns and prestressed “L” beams,which carry the weight of the double tee roofand 4-ft. wide double tee wall panels.

The architect listed five reasons for selectingprestressed concrete for the project. Mostimportantly, Scott Foresman was faced witha loss of its existing leased space in a shorttime, so construction time was critical.

Their product (books) required excellentfire protection and established bay sizes toaccommodate an existing stock handlingsystem. Also, a winter construction schedulewas faced, and the owner wanted tominimize maintenance.

Finally, cost estimates were made onseveral systems and materials, and prestressedconcrete seemed the most economical.

Architect: jack Richardson Frye; Structural Engineer:Ray T. Chalfant jr.; General Contractor: Smith & Plasterof Georgia, Inc.; Prestressed Concrete: ConcreteMaterials Inc.

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Plant, Office BuildingBank Printing Company, Inc.Los Angeles, California

Maximum land use, low construction costs, and speedyerection were advantages gained by using precastprestressed and cast-in-place concrete in the plantand office of the Bank Printing Co., Inc.

By providing parking on the roof of the plant, thearchitects were able to use the entire existing sitefor the building, while solving the problem ofproviding on-site parking.

Repetitive use of standard concrete componentssuch as prestressed single tees for the roof and precastwall panels had a significant effect on reducing overallbuilding costs. The square foot cost was significantlybelow the Southern California average.

The 34,000-sq. ft. building was completed in lessthan six months. Contributing to construction speedwas the use of the 50-ft. long single tees andexposed-aggregate wall panels.

A spread tee system combined with a post-tensionedcast-in-place slab provides the roof deck for the89-car parking lot. This makes it water tight.

A. SPREAD SINGLE-TEE SYSTEM.

Architects-Engineers: T. Y. Lin and Associates; General Contractor:Donald F. Shaw; Post-Tensioning: Atlas Prestressing Corp.;Precast Prestressed Concrete: Interpace.

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Warehouse and Office BuildingBayou News Agency, Inc., Baton Rouge, Louisiana

A triple A fire and storm insurance rating givento the Bayou News Agency’s administrativeoffices and warehouse was the cardinal reasonthe architect chose prestressed concrete.

Precast concrete columns and beams anda prestressed concrete double tee roof systemover the warehouse and precast channelslabs over the offices combine with concretemasonry walls. This combination enabledthe owner to attain insurance premiums atleast $2,700 a year less on the $225,000structure than with other building materials.

The annual premium rates for the buildingare only $3.81 per $1,000 of insurance, whilethe rates on an all metal building would be$15.86 per $1,000 of insurance, accordingto the architect.

The architect also chose prestressed concretedouble tees for the roof to achieve long clearspans. Voids between tee stems provide naturallight in the warehouse of the magazine andbook distribution agency.

The building was designed to take advantageof standard precast and prestressed elements.Also, concrete’s insulating qualities accountedfor economical heating and ventilating systems.

The double tees are 8-ft. wide and 24-in.deep, spanning 60 ft. across the warehouse and40 ft. across a mezzanine. The channel slabsare 4-ft. wide, 16-in, deep, and span 40 ft.

Architect: Frederick Charles Dupre; Structural Engineers:Rayner and McKenzie; General Contractor: Comeaux Bros.;Precast Prestressed Concrete: Louisiana ConcreteProducts, Inc.

The choice of prestressed concrete for thesulphur handling structure for VancouverWharves Ltd. was very important becauseof the corrosive and inflammable natureof sulphur.

In addition, there was only a short timeallowance for construction. The use of verylarge precast components also resulted ina cost competitive with other materials.

The structure is a high capacity stockpilingand reclaiming facility for Vancouver’s portcomplex. It was built to act as a cover fora 40,000-ton pile of crushed dry sulphur.

Fourteen prestressed bulb tees 140-ft.long, 16-ft. wide, and 5-ft. deep are erectedat a 45° angIe. They are post-tensioned laterallyin line with the three hinge joints.

Supporting a conveyor belt leading to thestructure are two 11-ft. wide bulb tees restingon two 24-in, hollow octagonal precast pilesand a precast cap.

Structural Engineers: Underwood McLellan & AssociatesLtd.; Prestressed Concrete and Post-tensioning:Pacific Prestress Ltd.

PRESTRESSED CONCRETE INSTITUTE

Sulphur Handling StructureNorth VancouverBritish Columbia, Canada

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PCI

/STRUCTURALARCHITECTURAL

p~items/MARcH 1970