Harrisburg, Pennsylvania Harrisburg, Pennsylvania Market Square - PDF document

Market Square Plaza Market Square Plaza Harrisburg, Pennsylvania Harrisburg, Pennsylvania Market Square Plaza Nicole Renno Structural Option 17 North Second Street Harrisburg, Pennsylvania Market Square Plaza Introduction Background � Project Background Structural � Structural Redesign Loads • Loads Gravity • Gravity System Lateral Nicole Renno • Lateral System Connections • Connections Penn State University � Building Enclosure Enclosure Architectural Engineering � Budget Senior Thesis Presentation Budget � Summary Summary � Questions Questions Market Square Plaza Market Square Plaza Market Square Plaza Market Square Plaza Harrisburg, Pennsylvania Harrisburg, Pennsylvania Harrisburg, Pennsylvania Harrisburg, Pennsylvania Nicole Renno Nicole Renno Structural Option Structural Option Location Architecture & Overview: Introduction Introduction � 17 North 2 nd Street � 18 stories, 240’ tall Background Background � Harrisburg, Pennsylvania n1 � 270,000 square feet of usable space Structural Structural Loads Loads � Construction – July 2003 to Spring 2005 Gravity Gravity Walnut Street � $28 million estimated cost Lateral Lateral Parking garage Walnut Street Connections Connections � Function: Retail, parking, and office space Enclosure Enclosure • 1 st Floor – Retail and restaurant space • 2 nd Floor – Transfer trusses span 65’ over Hilton Budget Budget Market Square Plaza Hilton Hotel Hotel Ballroom to create a large, open space Summary Summary • 3 rd to 10 th Floors – Parking levels accessed from Questions Questions adjacent existing parking garage • 11 th to 18 th Floors – Open plan office space 2nd Street Market Square Plaza Market Square Plaza Market Square Plaza Market Square Plaza Harrisburg, Pennsylvania Harrisburg, Pennsylvania Harrisburg, Pennsylvania Harrisburg, Pennsylvania Nicole Renno Nicole Renno Structural Option Structural Option Typical Floorplan: 132’ x 154’ Design Codes Introduction Introduction 132’−1" � Original Design – ASCE 7-95 Background Background 22’ � Redesign – ASCE 7-02 Structural Structural 32’−4" Loads Loads Load Changes Gravity Gravity TYPICAL EXTERIOR & INTERIOR BAYS � Gravity Loads Lateral Lateral MEMBERS CONTRIBUTING TO Connections MAIN LATERAL Connections • Parking level decreased from 50 psf to 40 psf RESISTING SYSTEMS 154’ � Lateral Loads Enclosure Enclosure 132’ • Large increases since ASCE 7-95 Budget Budget • Overall drift >1.5 times allowable when analyze Summary Summary according to ASCE 7-02 • Building site increased from 70 mph wind zone to 90 Questions Questions mph wind zone • Site Classification Category A eliminated from code 99’−9" 1

Market Square Plaza Market Square Plaza Market Square Plaza Market Square Plaza Harrisburg, Pennsylvania Harrisburg, Pennsylvania Harrisburg, Pennsylvania Harrisburg, Pennsylvania Nicole Renno Nicole Renno Structural Option Structural Option Gravity Redesign: Parking Levels Gravity Redesign Introduction Introduction 30’−6" 30’−6" Background Background W24x62 [36] W18x40 [14] C=1" � Increase Efficiency of Floor System by Structural Structural considering: Loads Loads W21x44 [17] C= 34 " W21x44 [17] C= 34 " W21x44 [17] C= 34 " W21x44 [17] C= 34 " W21x44 [17] C= 34 " W18x35 [12] C=1− 12 " W18x35 [12] C=1− 12 " W16x31 [12] C=2" W16x31 [12] C=2" Gravity Gravity 36’−6" 36’−6" •Direction of framing Lateral Lateral Connections •Number of beams per bay Connections Enclosure Enclosure W24x76 [32] C= 34 " W21x48 [16] C=1" •Beam sizes Budget Budget W16x26 [14] C= 34 " W16x26 [14] C= 34 " W16x26 [14] C= 34 " W16x26 [14] C= 34 " W16x26 [14] C= 34 " •Number of shear studs W14x22 [9] C=1" W14x22 [9] C=1" W14x22 [9] C=1" W14x22 [9] C=1" 26’ 26’ Summary Summary Questions Questions W24x68 [26] C= 34 " W21x44 [16] C=1" Redesign Original Market Square Plaza Market Square Plaza Market Square Plaza Market Square Plaza Harrisburg, Pennsylvania Harrisburg, Pennsylvania Harrisburg, Pennsylvania Harrisburg, Pennsylvania Nicole Renno Nicole Renno Structural Option Structural Option Gravity Redesign: Office Levels Introduction Introduction Lateral Redesign 30’−6" 30’−6" W24x62 [36] W18x35 [29] C= 34 " Background Background � Update frames to resist increased lateral Structural Structural loads W16x31 [40] C=1− 14 " W16x26 [46] C=1− 12 " W16x26 [46] C=1− 12 " W16x31 [40] C=1− 14 " Loads Loads W21x44 [17] W21x44 [17] W21x44 [17] W21x44 [17] W21x44 [17] 36’−6" 36’−6" Gravity Gravity � Redesign HSS braces as W-shapes so Lateral Lateral Connections Connections that bolted connections can be utilized W21x44 [39] C= 34 " W24x76 [32] Enclosure Enclosure � Eliminate moment connections Budget Budget W16x26 [16] W16x26 [16] W16x26 [16] W16x26 [16] W16x26 [10] W16x26 [10] W16x26 [10] W16x26 [10] W16x26 [10] 26’ 26’ Summary Summary Questions Questions W24x62 [57] W18x40 [43] C= 34 " Redesign Original Market Square Plaza Market Square Plaza Market Square Plaza Market Square Plaza Harrisburg, Pennsylvania Harrisburg, Pennsylvania Harrisburg, Pennsylvania Harrisburg, Pennsylvania Nicole Renno Nicole Renno Structural Option Structural Option North-South Frames East-West Frames Introduction Introduction � No change in frame Background Background configurations Structural Structural Loads Loads � Redesign resulted in Gravity Gravity much larger members Lateral Lateral Connections Connections Enclosure Enclosure Budget Budget Summary Summary Questions Questions Original Design Redesign 2

Market Square Plaza Market Square Plaza Market Square Plaza Market Square Plaza Harrisburg, Pennsylvania Harrisburg, Pennsylvania Harrisburg, Pennsylvania Harrisburg, Pennsylvania Nicole Renno Nicole Renno Structural Option Structural Option Typical Bracing Connections Building Enclosure: Existing Introduction Introduction Background Background � 7” Precast Concrete Panels � Eliminate costly field welds on braces Structural Structural •Economical Loads Loads Typ •Durable Gravity Double Angles Gravity Typ Double Angles Connection Plate Lateral Lateral •Fast Erection Connections Connections HSS 2 plates •High level of quality control 4 Angles Enclosure Enclosure � Disadvantages Budget Budget •Heavy Summary Summary •Could improve upon insulation Questions Questions characteristics Original Redesign Market Square Plaza Market Square Plaza Market Square Plaza Market Square Plaza Harrisburg, Pennsylvania Harrisburg, Pennsylvania Harrisburg, Pennsylvania Harrisburg, Pennsylvania Nicole Renno Nicole Renno Structural Option Structural Option Building Enclosure: Redesign Carbon Fiber Reinforced Panels Introduction Introduction � Carbon Fiber Reinforced Precast Concrete � Same advantages as traditional precast, Plus: Background Background Panels • Lighter – lighter supporting members and save on Structural Structural shipping costs • Carbon fiber reinforcement in place of secondary Loads Loads steel reinforcement and shear reinforcement • Requires only ¼” of concrete cover Gravity Gravity Foam Lateral Lateral • Better controls shrinkage cracking Structural or Architectural Concrete Connections Connections • Non-corrosive – will not corrode, stain, or spall Carbon Fiber Shear Grid Rebar Enclosure Enclosure • Higher insulation values up to R-13 • Same architectural finishes can be obtained Budget Budget 7" � Disadvantages Summary Summary Questions Questions • Slightly more expensive, but can be recouped as energy savings over time Carbon Fiber Grid Reinforcement Architectural Concrete Market Square Plaza Market Square Plaza Market Square Plaza Market Square Plaza Harrisburg, Pennsylvania Harrisburg, Pennsylvania Harrisburg, Pennsylvania Harrisburg, Pennsylvania Nicole Renno Nicole Renno Structural Option Structural Option Budget Impact Recommendations Introduction Introduction Background Background � Remove one beam per bay � Floor System: -$60,400 Structural Structural � Remove moment connections in North-South Loads •Material: -$48,500 Loads frames Gravity Gravity •Decking: +$31,700 Lateral Lateral � Replace HSS braces as W-shapes Connections Connections •Cambering & Shear Studs: +$29,600 � Redesign frames according to ASCE 7-02 Enclosure Enclosure •Labor: -$61,200 � Reconfigure brace connections from welded to Budget Budget � Lateral Redesign: +$61,700 bolted Summary Summary •Member Material: +119,300 � Replace tradition precast panels with carbon Questions Questions •Moment Connections: -$57,600 fiber reinforced precast panels 3

Market Square Plaza Market Square Plaza Harrisburg, Pennsylvania Harrisburg, Pennsylvania Nicole Renno Structural Option ??? Introduction Background Structural Loads Questions Gravity Lateral Connections ??? Enclosure Budget Summary Questions 4