Common Standard Guidelines for Structural Safety Assessment of RMG - - PowerPoint PPT Presentation

Improving Working Conditions in the RMG Sector

Common Standard Guidelines for Structural Safety Assessment of RMG Buildings in Bangladesh

Professor Dr. Ahsanul Kabir CE Dept., BUET, Dhaka

Safety Assessment Stages

Stage 1: Preliminary visual inspection

(based on visual observation of distress and some rudimentary calculation)

Stage 2: Detail engineering investigation

(based on field and laboratory testing followed by analysis and design checking)

Stage 3: Design of Retrofit Scheme

(based on stage 2 findings)

Visual Inspection (Stage-1)

ESTABLISH AIMS AND REQUIREMENTS DOCUMENT SURVEY SITE VISIT FOR VISUAL INSPECTION & INFORMATION COLLECTION

STAGE 1

PRELIMINARY CALCULATION OF CAPACITY REPORTING Check if detail analysis is reqd.?

If yes stage 2 reqd.

Structural Assessment is a process to evaluate the existing structure in terms of withstanding the current loads to which it is subjected and probable loads that it is going to experience in future time :

Need for Common Guidelines

• Assessment of Existing Building is

different from design of a new building

• Assessment depends on Engineering

judgment of person/s and experience

Need for Common Guidelines (p/2)

• Compliance to Building code may not

be met, yet the building can serve the present purpose with low risk

• Different groups may differ in their
• pinions regarding safety
• A common guideline and a central

body is essential to remove the differences

• Beam

Column Ceiling

Assessment Records

• Methods

for Design Adequacy Assessment

• Safety
• f

Foundations and Pile Supported Structures

• Safety of RC Structures
• Loading,

Load Combination and Restricted Reduced Loading

Live Load and Lateral Loads, Load Combinations, Prescribe Reduced Loads

• Assessment of Material Strength

Assessment Guidelines

• Durability and Maintenance

efflorescence and dampness; Water logging

• Additions and Alterations

May be allowed if comply with BNBC.

• Equipment and Fixtures

All non-structural elements suspended from, attached to, or resting atop the structure shall be anchored and braced to resist earthquake forces.

• Vulnerable/Critical Members

Slender Columns, flat plates and footings with inadequate thickness for shear etc. are Vulnerable Critical Members

Distressed Members

Assessment Guidelines (p/2)

• Certification after Retrofitting
• Further Construction
• New Construction of RMG Factory
• Other Brand/Buyer Requirements *
• Structures with no Proper

Documentation

* To be allowed by the national committee

Assessment Guidelines (p/3)

Qualification of Engineering Team who can Make Assessment and Provide Certification

At least two qualified Engineers (one structural and

• ther geotechnical engineer). Minimum qualification
• reqd. for applying for registration as a team:
• B. Sc Engg. (Civil or Civil and Structural or Civil and

Geotechnical) from a recognized university

• IEB Member/Fellow
• More than 10 years of Professional Experience
• Practicing as a Structural/Geotechnical Engineer or

worked in consulting company/ institution. Registration renewable every 3 years

Assessment Guidelines (p/4)

Visual Assessment to suggest 2nd stage

Assessment Guidelines (p/5)

1. Is the structure properly designed by professionals?

Yes/No

If all these answers are yes, Preliminary Assessment may

• suffice. Detail

Engg Assessment necessary, if gross inadequacies exist; building may remain

• perational.

2. Is the structure free from any visible distress (progressive cracking) in main load carrying members?

Yes/No

3. Is the foundation adequate (in bearing and settlement) considering the sub soil condition?

Yes/No

4. Is the structure out of risk due to presence of critical structural element (slender column, flat plate, transfer girder, foundation weakness)?

Yes/No

5. Is the vertical and lateral load resisting system (load path) apparently adequate?

Yes/No

6. Is the structure free from cracks in column and/or beam indicating foundation yielding?

Yes/No

7. Was the building had minimum standard of civil work supervision during construction?

Yes/No /Uncertain

References:

• 1. Bangladesh National Building Code (BNBC), 2006,
• 2. ACI 437R-03, Strength Evaluation of Existing

Buildings.

• 3. ASTM 2018, Standard Guide for Property

Condition Assessments:

• 4. ACI 201.1R-08 Guide for Conducting Visual

Inspection of Concrete in Service.

• 5. ACI 318-11, Building Code Requirements for

Structural Concrete.

Assessment Guidelines (p/6)

Improving Working Conditions in the RMG Sector