Structural Integrity–R.C.C.&Steel Structures

Architectural and Structural design

VEC has successfully completed a large number (65+ RMG-Factories, Residential & Commercial Building) of Structural Detail Engineering Assessment (DEA) Architectural and Structural design.

Detail Engineering Assessment (DEA) process as per the Alliance, Accord, NI, BNBC standard:

Essential Information and steps for Detail Engineering Assessment (DEA)

Architectural and Structural design DEA Steps:

 

  1. The structural, non-structural elements with dimensions at all levels, foundations and framing on the plan, section and elevation.
  2. Cross-sectional drawings showing reinforcements in foundations, columns, beams, slabs, etc.
  1. If as-built drawings are available–verify if it truly represents the structure.
  2. The as-built drawing shall be prepared/checked as per Alliance standard 8.19and/or8.20.
  3. Scanning of rebars in main structural elements of lower tiers (SeeAPD.5) to confirm as-built condition.
  4. Arrange confirmatory soil test(2/3borings)
  5. A spot check of the foundation by excavation, if necessary
  6. Identify causes of any physical distress, dampness or any other abnormalities and suggest remedial measures.
  7. Work on specific terms of concern identified by the QAF in the initial structural assessment report
  8. Identify any overloading, additions, extensions, presence of water tanks, towers. Study their effect on the structure and suggest remedial measures.
  9. Arrange for core test by taking 4 Nos. 4in. cores (see details in APD.5, D.17) to assess in situ strength. Use ACI 562 to find 𝒇′𝒆𝒒 to be used in design checking.
  10. Prepare structural model as per As-built drawing using appropriate software by following the standard practice and building code.
  1. Obtain reliable data on steel grade or arrange to test of steel rebar (if possible) or assume 40grade conservatively for using in all analysis/design adequacy.
  2. Use loading and Load factors as per standard (NTC/Alliance)
  3. Check strength and serviceability requirements as per BNBC-2006
  4. Make recommendation(s) based on results of DEA–including restriction of loading, restriction on the vertical extension.
  5. In case of deficiency in the structural integrity of the structure(s), the appropriate retrofitting scheme is to be designed.
  6. Prepare Load Plan and arrange to post of load plan and approve it.
  • DEA Deliverables:
  1. Approved As-built structural architectural drawings.
  • DEA Report with the following items:
  1. Highlight any variation between as built and designed structure (if known)
  2. Results of testing for strength and materials
  3. Results of geotechnical investigation
  4. Details of loading, inputs, and results of computer modeling
  5. Commentary on adequacy/inadequacy of elements of the structure
  6. Schedule of any required retrofitting required for safety or safe performance of a structure
  7. If applicable, retrofitting scheme design with detail working drawings and design assumptions/notes
  8. Approved Load plans.

  • Our DEA process :

  • Detail Engineering Assessment (DEA):

  • Assessment Procedure
  • Resources Management
  • Assessment Procedure:
  1. Physical observation
  2. Investigative studies
  3. Inferences
  4. Strengthening Measures
  5. Concluding remarks
  • a) Physical observation
  1. Any sign of settlement
  2. Any sign of distress in any key structural elements
  3. Any kind of dampness/standing water.
  4. Any kind of corrosion.
  5. Any kind of twisting/rupture/ sagging in the structural members.
  6. Any other defects in any structural elements.
  7. Current loading condition in the structure (at each floor)
  • b) Investigative studies
  1. Dimensional measurement of structural members
  2. Testing:
    1. SDT:
      1. Semi-Destructive test to access of in-situ concrete in RC footings, Columns, Beams and slabs
    2. NDT:
      1. Ultrasonic pulse velocity test on RC columns and beams
      2. Rebound Hammer test on RC slabs
    3. Cover meter studies to map the disposing and dia of peripheral rebars in RC members
    4. Theoretical analysis to verify the structural adequacy of existing members for present level loading
  • Architectural and Structural designArchitectural and Structural designArchitectural and Structural designArchitectural and Structural design
  • c) Inferences
  • Inferences based on the above investigative studies.
  • d) Strengthening Measures
  • Retrofitting scheme.
  • e) Concluding Remarks
  • Recommendation(s) based on results of DEA–including restriction of loading, restriction on the vertical extension.
  • 2. Resources Management:
  • Six members required in each DEA team and they will divide into four groups under one team leader.
  • Group A:
  • Member:
  1. Structural engineer
  2. CAD operator
  • Responsibilities:
  1. Dimensional measurement of structural members.
  2. Prepared as-built Structural drawing.
  • Group B:
  • Member:
  1. Structural engineer.
  • Two labors from the client end.
  • Responsibilities:
  1. Semi-Destructive test (core samples) to access of in-situ concrete in RC footings, Columns, Beams and slabs.
  2. Ultrasonic pulse velocity test on RC columns and beams.
  • Group C:
  1. Team leader
  2. Structural engineer
  • Architectural and Structural  Responsibilities :
  1. Cover meter studies to map the disposing and dia of peripheral rebars in RC members.
  2. Rebound Hammer test on RC slabs.