BUILDING INTEGRITY SUMMARY REPORT

Transcription

1 BUILDING INTEGRITY SUMMARY REPORT SUPPLIER NAME Kenpark Bangladesh Apparel Pvt. Ltd (Unit 2) UNITS AUDITED SUPPLIER ADDRESS Wash Building Plot # 69-85, Karnaphuli 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. Wash Building GREEN The building is fully safe. SEISMIC PERFORMANCE RATING POOR Possible significant structural and nonstructural damage Wash Building POOR and/or result in falling hazards in a major seismic disturbance, representing appreciable life hazards. BRIEF DESCRIPTION OF METHODOLOGY Visual inspection and ASCE Tier-1 Analysis BUILDING INTEGRITY INSPECTION SUMMARY KENPARK BANGLADESH APPAREL PVT LTD (UNIT 2) PAGE 1/6

2 DETAILED CONTENT VISUAL INSPECTION AND CONCLUDING REMARKS... 2 MAIN BUILDING... 2 WASH BUILDING... 2 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... 5 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 potential causes 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 4 storied washing plant and the single storied factory building have different framing system and both of them are connected at the ground floor level; during occurrence of an earthquake pounding may occur. Sufficient gap based on DEA need to be provided to avoid pounding immediately. The cracked masonry wall of the internal mezzanine floor should be repaired using FRP or by other means 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 At present there is no distress in the structure. However, the owner/users of the building should be vigilant about development of any new distress, particularly, in primary structural elements such as columns, beams and slabs. This building has fallen in GREEN (safe) category considering the Factor of Safety (FOS) of all types of columns. The 4 storied washing plant and the single storied factory building have different framing system and both of them are connected at the ground floor level; during occurrence of an earthquake pounding may occur. Sufficient gap based on DEA need to be provided to avoid pounding immediately. The double height ground floor with presence of mezzanine floor makes the structure vertically irregular. Also some columns have high slenderness ratio. From ASCE31 checklist, it is observed BUILDING INTEGRITY INSPECTION SUMMARY KENPARK BANGLADESH APPAREL PVT LTD (UNIT 2) PAGE 2/6

3 that the ground floor has become soft story with respect to other floors (see Appendix B). The affected columns need to be strengthened immediately to avoid soft story failure. 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 All factory building with a mezzanine floor and the single-storied canteen have different framing system and The clear distance between the building both of them are connected being evaluated and any adjacent at the ground floor level Adjacent building shall be greater than 4 percent through a covered Buildings of the height of the shorter building for passageway. Also the 4 Life Safety and Immediate Occupancy. storied washing plant and the single storied main factory building with a mezzanine floor are connected at the ground floor level. Mezzanines Configuration Soft Story Torsion Interior mezzanine levels shall be braced independently from the main structure, or shall be anchored to the lateral-force-resisting elements of the main structure. The stiffness of the lateral-force resisting system in any story shall not be less than 70 percent of the lateral-forceresisting system stiffness in an adjacent story above or below, or less than 80 percent of the average lateral-forceresisting system stiffness of the three stories above or below for Life Safety and Immediate Occupancy. The estimated distance between the story center of mass and the story center of rigidity shall be less than 20 percent of the building width in either Mezzanine floor exists in two locations. The main mezzanine where the office is located is anchored. The other mezzanine which is located inside the warehouse area and not shown in the structural drawings may not be anchored properly. Ground floor is soft story based on measured story height and given column dimensions The distance between story center of mass and center of rigidity is not less than the 20% of plan dimension in Wash Building BUILDING INTEGRITY INSPECTION SUMMARY KENPARK BANGLADESH APPAREL PVT LTD (UNIT 2) PAGE 3/6

4 plan dimension for Life Safety and Immediate Occupancy. both direction due to mezzanine. 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 Lighting securely fixed. earthquake. 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 Condition of Materials Cracks In Infill Walls Equipment weighing over 20 lb that is attached to ceilings, walls; or other supports 4 feet above the floor level shall be braced. There shall be no existing diagonal cracks in the infilled walls that extend throughout a panel greater than 1/8 inch for Life Safety and 1/16 inch for Immediate Occupancy, or out-of-plane offsets in the bed joint greater than 1/8 inch for Life Safety and 1/16 inch for Immediate Occupancy. 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. The wall of the internal mezzanine floor has such cracks. All BUILDING INTEGRITY INSPECTION SUMMARY KENPARK BANGLADESH APPAREL PVT LTD (UNIT 2) PAGE 4/6

5 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 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 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 BUILDING INTEGRITY INSPECTION SUMMARY KENPARK BANGLADESH APPAREL PVT LTD (UNIT 2) PAGE 5/6

6 earthquake safety, such that funds need not be spent to improve their seismic resistance to gain greater life safety. 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 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 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 APPAREL PVT LTD (UNIT 2) PAGE 6/6