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Concerto

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Concerto

  1. 1. Concerto<br />A 28-story Residential Tower in Downtown Los Angeles<br />The Englekirk Companies<br />
  2. 2. Project Team<br />Developer: Astani Enterprises<br />Architect: De Stefano + Partners<br />Engineer of Record: Englekirk Partners<br />Contractor: Astani Builders<br />Construction<br />Management: Webcor Builders<br />
  3. 3.
  4. 4. Project Description<br /><ul><li>Twin 28-story condominium towers with 4-story subterranean garage.
  5. 5. 4th floor plaza with pool, landscaping, and 5-story wood building.
  6. 6. 858,220 total area.
  7. 7. 348 Condo Units
  8. 8. 398,295 SF parking area.
  9. 9. Estimated Construction Cost is $150M.
  10. 10. Located in downtown Los Angeles</li></li></ul><li>Future Tower<br />Tower<br />Plaza<br />4-story Wood Bldg.<br />Project Description<br /><ul><li>Large floor plate up to 4th floor, with parking, plaza area, and 4-story wood building
  11. 11. Concrete ductile moment frames with 2-way slab construction
  12. 12. Majority of 4-story area and 1st tower in Phase 1. Second tower to be constructed later in Phase 2.</li></li></ul><li>
  13. 13. Structural Description<br />Foundation and Underground Levels:<br /><ul><li>Tower structure is supported by 5 feet deep Mat Foundation.
  14. 14. 4-story tall basement wall thickness is 18” and 16”.
  15. 15. Parking structure is supported by isolated pad footings.
  16. 16. Subterranean parking slab is 10 ½” thickness two-way slab.</li></ul>Function:<br /><ul><li>Parking Area
  17. 17. Underground DWP Vault.
  18. 18. Underground water tank and fire pump room.</li></li></ul><li>Phase II<br />Mat<br />Parking Garage<br />Foundation Plan<br />
  19. 19. Tower<br />Parking<br />Lower Levels Plans<br />
  20. 20. Structural Description<br />Tower and Podium Structure:<br /><ul><li>1st Floor:
  21. 21. Main Lobby
  22. 22. Retail and Restaurant
  23. 23. Parking Spaces
  24. 24. 2nd Floor :
  25. 25. Parking Spaces
  26. 26. 3rd Floor:
  27. 27. Tower – Fitness and Residential Area
  28. 28. Parking Spaces and Residential Loft Area.</li></li></ul><li>Tower<br />Retail<br />Parking<br />Retail and Loft<br />Ground Floor Plan<br />
  29. 29. Tower<br />Parking<br />2nd Floor Plan<br />
  30. 30. Tower<br />Retail and Loft<br />3rd Floor Plan<br />
  31. 31. Structural Description<br />4th Floor :<br />Podium Structure: <br /><ul><li>Landscape Area
  32. 32. Pool and Recreational Area.</li></ul>Loft – Residential Area<br /><ul><li>12” and 14” thick slab
  33. 33. 15” thick pool slab</li></ul>Tower:<br /><ul><li>Residential Area.</li></li></ul><li>Court Yard<br />Tower<br />Loft<br />4th Floor Plan<br />
  34. 34. Structural Description<br />Tower:<br /><ul><li>Tower Roof Height is 330 feet.
  35. 35. Typical floor – 8” Post-tensioned Slab.
  36. 36. Typical floor to floor height – 11 feet.
  37. 37. Perimeter Gravity Columns – 24” and 30” Round.
  38. 38. Floor Plate dimension: 165 feet x 80 feet</li></li></ul><li>Typical Architectural Plan<br />
  39. 39. Structural Description<br />Structural Highlight Features:<br /><ul><li>Interior Moment Concrete Frames Building
  40. 40. Allow for a more open and visually appealing exterior façade.
  41. 41. Utilizing High Strength Concrete VS Conventional Concrete (F’c = 11,000 psi)</li></ul>- Reducing Column sizes to increase selling area.<br /><ul><li>First Performance-Based Design Building in Los Angeles</li></li></ul><li>Longitudinal: (2) 5-bay frames<br />Transverse: (6) 1-bay frames w/ cap beam<br />Lateral System<br />Tower Framing:<br /><ul><li>Two 5-bay Longitudinal Moment Frames, 36”x30” beams
  42. 42. Six 1-bay Transverse Moment Frames, with 36”x42” beams and a cap beam at the roof
  43. 43. Frame Columns are 36”x58” at the base decreasing to 36”x36” at the upper levels. Concrete strength ranges from 11 ksi to 6 ksi.</li></ul>Plan View<br />
  44. 44. Lateral System<br /><ul><li>A cap beam is used on the transverse frames to reduce drift and more evenly distribute beam moment demand up the building
  45. 45. Cap beam helps provide added stiffness to the building frame</li></ul>Plan View<br />Ground<br />Frame Elevation<br />
  46. 46. Loft Bldg<br />Tower Section<br />
  47. 47. Tower Cross Section<br />
  48. 48. Exterior Curtain Wall along the exterior of the building<br />Tower Elevation<br />
  49. 49. Tower Elevation<br />
  50. 50. Performance Based Design<br />Performance Based Design<br /><ul><li> First building to get a permit in the City of Los Angeles using 3D nonlinear time history analysis.
  51. 51. The time history analysis allowed us to waive the code minimum base shear, which has the following benefits:
  52. 52. Less rebar in beams reduces congestion and reduces demands on columns.
  53. 53. Lower axial forces in columns allow smaller column sizes while still maintaining axial stresses below the ductile limit.
  54. 54. Followed UBC Section 1631.6:
  55. 55. Sets ground motion scaling and number of earthquake records
  56. 56. Requires peer review.</li></li></ul><li>Performance Based Design<br />Peer Review Process<br /><ul><li> Panel of 2 structural engineers and 1 geotechnical engineer
  57. 57. We developed a procedure for their approval prior to starting the analysis
  58. 58. Method of ground motion scaling
  59. 59. Which code requirements would be waived (minimum base shear, accidental torsion, and redundancy)
  60. 60. Modeling assumptions (elastic properties, hinge properties, rigid end zones, mass)
  61. 61. Limit states and acceptance criteria
  62. 62. Submitted analysis results and design package for panel approval
  63. 63. Normal City plan check process was still required after peer review approval</li></li></ul><li>Construction<br />Excavation – August 2007<br />
  64. 64. Construction<br />Bottom of Mat Foundation<br />
  65. 65. Construction<br />Foundation Pad<br />
  66. 66. Construction<br />Shoring <br />
  67. 67. Construction<br />Mat Foundation Rebar Placement – August 22,07<br />
  68. 68. Construction<br />Mat Foundation Rebar Placement – August 22,07<br />
  69. 69. Construction<br />Mat Foundation Rebar Placement – August 22,07<br />
  70. 70. Construction<br />Mat Foundation Rebar Placement – August 22,07<br />
  71. 71. Construction<br />Mat Foundation Rebar Placement – August 22,07<br />
  72. 72. Construction<br />Tower Column Rebar Placement – November, 07<br />
  73. 73. Construction<br />Tower lower level floors – November 28,07<br />
  74. 74. Construction<br />Shotcrete walls<br />
  75. 75. Construction<br />Parking Structure Foundation – November 28,07<br />
  76. 76. Construction<br />Parking Structure Foundation – January, 08<br />
  77. 77. Construction<br />Parking Structure Foundation – February, 08<br />
  78. 78. Construction<br />Parking Structure Lower Levels – February, 08<br />
  79. 79. Construction<br />Parking Structure Lower Levels – April, 08<br />
  80. 80. Construction<br />Tower Ground floor – January,08<br />
  81. 81. Construction<br />Tower Building – 6th floor - March 08<br />
  82. 82. Construction<br />Tower Building – 10th floor – April 08<br />
  83. 83. Construction<br />Tower Building – June 08<br />
  84. 84. Construction Photos<br />Tower Building<br />
  85. 85. Construction<br />Typical Tower PT Slab<br />
  86. 86. Construction<br />MEP Coordination<br />
  87. 87. Construction<br />Slab Column Connection<br />
  88. 88. Construction<br />Slab Column Connection at Perimeter<br />
  89. 89. Tower Slab MEP Penetration Plan<br />
  90. 90. Tower Slab MEP Penetration Plan<br />
  91. 91. Construction<br />MEP Coordination<br />
  92. 92. Construction<br />MEP Coordination<br />
  93. 93. Construction<br />MEP Coordination<br />
  94. 94. Frame Beam Penetration Detail<br />
  95. 95. Construction<br />MEP Coordination<br />
  96. 96. Construction<br />MEP Coordination<br />Frame Beam Penetration<br />
  97. 97. Longitudinal Frame<br />Transverse Frame<br />Connection Detailing<br /><ul><li>Careful coordination of beam and column reinforcing placement ensures constructability</li></li></ul><li>Construction<br />Tower Frame Column and Beam Connection<br />
  98. 98. Connection Detailing<br />Frame Beam Joint<br />
  99. 99. Connection Detailing<br />Frame Beam Joint<br />
  100. 100. Loft Building<br />
  101. 101.
  102. 102. Construction Photos<br />
  103. 103. Key Elements<br /><ul><li>Innovative and Creative in Structural Engineering leads to superior building system
  104. 104. Assist architect / developer in selecting a functional and cost-effective solution
  105. 105. Coordination work between disciplines
  106. 106. Collaboration between consultant team and the contractor results in a successful project.</li></li></ul><li>The Englekirk Companies<br />Questions?<br />

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