BUILDING INTEGRITY SUMMARY REPORT

Transcription

1 BUILDING INTEGRITY SUMMARY REPORT SUPPLIER NAME Kenpark Bangladesh Pvt.Ltd (Unit 1) UNITS AUDITED SUPPLIER ADDRESS Dry Process Building Sector 8, Plot 31-42, Chittagong Export Processing Zone, Chittagong, Bangladesh AUDIT DATE March 2014 AUDIT PERFORMED BY Department of Civil Engineering, Bureau of Research, Testing and Consultation, Bangladesh University of Engineering and Technology (BUET) AUDIT TEAM 2 auditors GRAVITY LOADING EVALUATION GREEN The building is fully safe. GREEN The building is fully safe. Dry Process Building AMBER The building's safety is not fully ensured. SEISMIC PERFORMANCE RATING POOR Possible significant structural and nonstructural damage POOR and/or result in falling hazards in a major seismic Dry Process Building POOR disturbance, representing appreciable life hazards. BRIEF DESCRIPTION OF METHODOLOGY Visual inspection and ASCE Tier-1 Analysis BUILDING INTEGRITY INSPECTION SUMMARY KENPARK BANGLADESH PVT LTD (UNIT 1) PAGE 1/6

2 DETAILED CONTENT VISUAL INSPECTION AND CONCLUDING REMARKS... 2 MAIN BUILDING... 2 WASH BUILDING... 2 DRY PROCESS BUILDING... 3 SEISMIC PERFORMANCE EVALUATION... 3 I. BASIC STRUCTURAL CHECKLIST NON-COMPLIANCES... 3 II. GEOLOGICAL SITE HAZARDS AND FOUNDATIONS CHECKLIST NON-COMPLIANCES... 4 III. BASIC NON-STRUCTURAL COMPONENT CHECKLIST NON-COMPLIANCES... 4 DETAILED DESCRIPTION OF METHODOLOGY... 4 VISUAL INSPECTION AND CONCLUDING REMARKS MAIN BUILDING Based on the Visual Assessment, we have decided that this building has fallen in safe, GREEN, category. There may be a potential cause of pounding due to different vibration modes of two dissimilar structures. The factory management has already arranged a Detail Engineering Assessment (DEA) from CUET and it has been concluded that the structure is properly designed as per code requirement. The single storied main factory building with a mezzanine floor and the single storied canteen have different framing system and both of them are connected at the ground floor level through a covered passageway. This may be a potential cause of pounding due to different vibration modes of two dissimilar structures. The fixed covered passageway need to be replaced with a sliding one to avoid pounding immediately. Bracings need to be provided to the steam pipes and other utility items which are hanging from the roof, immediately. The use of the building in its present condition may continue with due regards to the observations made above. WASH BUILDING This building has fallen in GREEN (safe) category considering the Factor of Safety (FOS) of all types of columns. From ASCE31 checklist, it is observed that some columns of ground floor do not satisfy the minimum requirements of shear stress. The affected columns need to be identified through DEA and strengthened immediately. The 3 storied extension building and the single storied washing plant have different framing system and both of them are connected at the ground & first floor levels; during occurrence of an earthquake pounding may occur. Sufficient gap based on DEA need to be provided to avoid pounding immediately. BUILDING INTEGRITY INSPECTION SUMMARY KENPARK BANGLADESH PVT LTD (UNIT 1) PAGE 2/6

3 Bracings need to be provided to the steam pipes and other utility items which are hanging from the roof, immediately. The use of the building in its present condition may continue with due regards to the observations made above. DRY PROCESS BUILDING The slender column used as central support appeared to be vulnerable under earthquake (strong beam weak column).the building has been tagged as AMBER with Detailed Engineering Assessment (DEA) to be commenced immediately and completed within the next 6 weeks. Bracings need to be provided to the steam pipes and other utility items which are hanging from the roof, immediately. The use of the building in its present condition may continue with due regards to the observations made above. SEISMIC PERFORMANCE EVALUATION I. BASIC STRUCTURAL CHECKLIST NON-COMPLIANCES Criteria Description of Conditions Comments Unit Building System - General The single-storied main factory building with a mezzanine floor and the single-storied canteen have The clear distance between the building different framing system and being evaluated and any adjacent both of them are connected Adjacent building shall be greater than 4 percent at the ground floor level Buildings of the height of the shorter building for through a covered Life Safety and Immediate Occupancy. passageway. Configuration The estimated distance between the story center of mass and the story center of rigidity shall be less than 20 Torsion percent of the building width in either plan dimension for Life Safety and Immediate Occupancy. Concrete Moment Frames Shear Stress Check The shear stress in the concrete columns, calculated using the Quick Check procedure of Section , shall be less than the greater of 100 psi or for Life Safety and Immediate Occupancy. Unreinforced Masonry Shear Walls Shear Stress The shear stress in the unreinforced Check masonry shear walls, calculated using There is a single story steel structure/shed connected with the extension building. The distance between story center of mass and center of rigidity is not less than the 20% of plan dimension in both direction due to mezzanine. The columns of ground floor are not satisfying the mentioned requirements. All unreinforced masonry shear walls do not satisfy the BUILDING INTEGRITY INSPECTION SUMMARY KENPARK BANGLADESH PVT LTD (UNIT 1) PAGE 3/6

4 the Quick Check procedure of Section , shall be less than 30 psi for clay units and 70 psi for concrete units for Life Safety and Immediate Occupancy. mentioned requirement. II. GEOLOGICAL SITE HAZARDS AND FOUNDATIONS CHECKLIST NON-COMPLIANCES Criteria Description of Conditions Comments Unit III. BASIC NON-STRUCTURAL COMPONENT CHECKLIST NON-COMPLIANCES Criteria Description of Conditions Comments Unit Lighting Fixtures Emergency lighting shall be anchored or Emergency Emergency lighting is not braced to prevent falling during an Dry Process Lighting securely fixed. earthquake. Building Building Contents and Furnishing Tall Narrow Contents Contents over 4 feet in height with a height-to-depth or height-to-width ratio greater than 3-to-l shall be anchored to the floor slab or adjacent structural walls. A height-to-depth or height-towidth ratio of up to 4-to-l is permitted where only the Basic Nonstructural Component Checklist is required. Mechanical and Electrical Equipment Attached Equipment Equipment weighing over 20 lb that is attached to ceilings, walls; or other supports 4 feet above the floor level shall be braced. The height to width ratio of tall rack is greater than 4 and are needed to be braced. External AC units may not be adequately braced. Dry Process Building All DETAILED DESCRIPTION OF METHODOLOGY 1. The following criteria are used for the building integrity inspection: A. Permit review and verification. B. Visual assessment. C. Detailed assessment following ASCE-31 standards. i. Level of Investigation ii. Level of Performance Evaluation to Life Safety Performance Level (L.S.) iii. Level of Seismicity According to BNBC (1993) and based on geotechnical investigation report 1. Zone coefficient 2. Site Class (as per BNBC 1993) Design short period response acceleration S DS BUILDING INTEGRITY INSPECTION SUMMARY KENPARK BANGLADESH PVT LTD (UNIT 1) PAGE 4/6

5 Design spectral response acceleration at 1 sec. SD 1 iv. Building Type v. Screening Phase (Tier 1) vi. Basic Structural Checklist vii. Geological Site Hazards and Foundation Checklist viii. Basic Non-structural Component Checklist 2. Gravity Loading Evaluation Definitions GREEN YELLOW AMBER RED Factor of Safety (FS) of Column Strength is greater than the building is fully safe Factor of Safety (FS) of Column Strength is between 1.5 and the building is marginally safe Factor of Safety (FS) of Column Strength is between 1.25 and the building's safety is not fully ensured Factor of Safety (FS) of Column Strength is less than the building is unsafe 3. Seismic Performance Ratings ( ) GOOD FAIR POOR VERY POOR Buildings and other structures whose performance during a major seismic disturbance is anticipated to result in structural and nonstructural damage and/or falling hazards that would not significantly jeopardize life. Buildings and other structures with a GOOD rating would represent an acceptable level of earthquake safety, such that funds need not be spent to improve their seismic resistance to gain greater life safety. Buildings and other structures whose performance during a major seismic disturbance is anticipated to result in structural and nonstructural damage and/or falling hazards that would represent low life hazards. Buildings and other structures with a FAIR seismic rating would be given a low priority for expenditures to improve their seismic resistance and/or to reduce falling hazards so that the building could be reclassified GOOD. Buildings and other structures expected to sustain significant structural and nonstructural damage and/or result in falling hazards in a major seismic disturbance, representing appreciable life hazards. Such buildings or structures either would be given a high priority for expenditures to improve their seismic resistance and/or to reduce falling hazards so that the building could be reclassified GOOD, or would be considered for other abatement programs, such as reduction of occupancy. Buildings and other structures whose performance during a major seismic disturbance is anticipated to result in extensive structural and nonstructural damage, potential structural collapse, and/or falling hazards that would represent high life hazards. Such buildings or structures either would be given BUILDING INTEGRITY INSPECTION SUMMARY KENPARK BANGLADESH PVT LTD (UNIT 1) PAGE 5/6

6 the highest priority for expenditures to improve their seismic resistance and/or to reduce falling hazards so that the building could be reclassified GOOD, or would be considered for other abatement programs, such as reduction of occupancy. BUILDING INTEGRITY INSPECTION SUMMARY KENPARK BANGLADESH PVT LTD (UNIT 1) PAGE 6/6