ASPIRE Summer 08 - Aspire - The Concrete Bridge Magazine
ASPIRE Summer 08 - Aspire - The Concrete Bridge Magazine ASPIRE Summer 08 - Aspire - The Concrete Bridge Magazine
Bridge overSWINGLEY RIDGE ROADby Kevin Eisenbeis, Harrington & Cortelyou Inc.The bridge spans Swingley RidgeRoad and provides access to theparking garage.Cast-in-placeconcrete providesthe answerA cast-in-place concrete bridgeprovided the aesthetic solution whenSachs Properties Inc., owners of theChesterfield Ridge Center officedevelopment complex in Chesterfield,Mo., needed a bridge for access to theirnew parking structure and six-storybuilding. The complex site geometricscalled for a bridge to span SwingleyRidge Road, while also providing accessto the rooftop level of a new parkingstructure.A new, 322-ft-long bridge spanningSwingley Ridge Road was desired toallow easy access to Chesterfield RidgeCenter from the nearby North Outer40 parallel connector road and I-64. A100-ft-long upper level drive extension,projecting from the bridge, was alsoneeded for access to a new parkingstructure. A cast-in-place, reinforcedconcrete bridge, T-shaped in plan view,provided the elegant solution desired.The monolithic concrete structure,profileSwingley Ridge Road Bridge / Chesterfield, Mo.Bridge Designer: Harrington & Cortelyou Inc., Kansas City, Mo.Civil Engineer: Volz Inc., St. Louis, Mo.Geotechnical Engineer: Geotechnology Inc., St. Louis, Mo.Building Architect: Mackey Mitchell Associates, St. Louis, Mo.40 | ASPIRE, Summer 2008
A cast-in-placereinforced concretebridge provided theelegant solution needed.the main structure. Use of a monolithicconcrete slab bridge eliminatedstructural discontinuities and complexsuperstructure framing details wherethe elevated structure arms converged.Pier caps supporting girders were nolonger needed. Expansion joints on thestructure could also be eliminated, withjoints being used only at abutmentsand where the entrance drive joined theparking structure.Eric Neprud, project engineer forHarrington & Cortelyou, summarizedthe choice: “Selection of the voided slabbridge drastically simplified the detailingrequirements where the access drivemeets the main bridge.” The use of16-in.-diameter voids embedded withinthe 2-ft 3-in.-thick slab reduced weightand material requirements, allowing thethin superstructure to span up to 60 ftbetween pier support points. Drop panelsvarying from 6-in. to 10-in.-thick wererequired to distribute loads to the narrowcolumns. A 28-day concrete compressivestrength of 4000 psi was used with theMissouri Class B2 mix design, allowingthe bridge to carry AASHTO HS-20 liveloading. A 5-ft-wide sidewalk was alsocantilevered from the bridge.Chesterfield, located just west of St.Louis, Mo., is subject to CategoryB seismic requirements. The complexT-shape of the structure dictated thata three-dimensional analysis wouldbe required for seismic considerationswith a ground acceleration of 0.12g.Structural analysis utilizing a responsespectrum analysis with mTAB Stress (SAP386) software indicated displacementsand loadings would be acceptable.The tall, slender piers supported onsingle drilled shafts performed wellwhen analyzed for seismic loading.Conventional analysis of the bridge wasmade utilizing the Brass program.Field exploration consisted of fourborings extending through the 41-ft to46-ft-thick overburden and 25 ft intothe rock below. Due to the geology ofthe site, a potential for slope instabilityin the earth fill required special analysis.supported on single-column, “golftee” concrete piers, provided the idealsolution to meet all structural, thermal,seismic, geotechnical, and aestheticdesign requirements.Several structural options were initiallyconsidered for the bridge. Framing issuesand thermal movement requirementsfor steel and concrete girder spansproved to be undesirable where theupper level drive entrance connected toA T-shaped bridgeprovided the solutionfor all structural,thermal, seismic,geotechnical, andaesthetic designrequirements.Cast-in-place reinforced concrete / Sachs Properties Inc., St. Louis, Mo., OwnerBridge Contractor: St. Louis Bridge, St. Louis, Mo.Field Observation: Alper-Ladd, St. Louis, Mo.Bridge Description: A cast-in-place reinforced concrete bridge, T-shaped in plan view consisting of eight spanssupported on six columns and three end bentsASPIRE, Summer 2008 | 41
- Page 2: ®Bentley®LEAPBridge. It’s all i
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- Page 28 and 29: AvoidingLANDSLIDESby Kevin Harper,
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- Page 32 and 33: ECONOMICAL BRIDGEWIDENINGby Craig A
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<strong>Bridge</strong> overSWINGLEY RIDGE ROADby Kevin Eisenbeis, Harrington & Cortelyou Inc.<strong>The</strong> bridge spans Swingley RidgeRoad and provides access to theparking garage.Cast-in-placeconcrete providesthe answerA cast-in-place concrete bridgeprovided the aesthetic solution whenSachs Properties Inc., owners of theChesterfield Ridge Center officedevelopment complex in Chesterfield,Mo., needed a bridge for access to theirnew parking structure and six-storybuilding. <strong>The</strong> complex site geometricscalled for a bridge to span SwingleyRidge Road, while also providing accessto the rooftop level of a new parkingstructure.A new, 322-ft-long bridge spanningSwingley Ridge Road was desired toallow easy access to Chesterfield RidgeCenter from the nearby North Outer40 parallel connector road and I-64. A100-ft-long upper level drive extension,projecting from the bridge, was alsoneeded for access to a new parkingstructure. A cast-in-place, reinforcedconcrete bridge, T-shaped in plan view,provided the elegant solution desired.<strong>The</strong> monolithic concrete structure,profileSwingley Ridge Road <strong>Bridge</strong> / Chesterfield, Mo.<strong>Bridge</strong> Designer: Harrington & Cortelyou Inc., Kansas City, Mo.Civil Engineer: Volz Inc., St. Louis, Mo.Geotechnical Engineer: Geotechnology Inc., St. Louis, Mo.Building Architect: Mackey Mitchell Associates, St. Louis, Mo.40 | <strong>ASPIRE</strong>, <strong>Summer</strong> 20<strong>08</strong>
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