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11-Building Structure Design

CHAPTER 11-BUILDING STRUCTURE DESIGN AND CONSTRUCTION REQUIREMENTS

11-1. Loads and Design

Structure analysis, design, detailing and loading shall be in accordance with the requirements of current Uniform Building Code (UBC) and American Code or British relevant Code or any other Code. Structure shall however be designed by only one approved Code.

11-2. Seismic Design

Seismic Risk Zone for Karachi will be zone~2B (with reference to UBC-97) which is equivalent to Peak Ground Acceleration (PGA) of 16% g to 24% g.

11-3. Sub Soil Investigation

In view of the structural design in Seismic hazard zone, type of Sub-Soil for foundation should be thoroughly ascertained by geo-technical investigation under the direct supervision of qualified and experienced geo-technical engineers The Soil Report should correlate the sub-soil type with UBC- 97 (or current) Sub-Soil list.

11-4. Wind Load

Wind load should be based on the velocity and gust factors data from local Meteorological Department.

11-5. Erection on Reclaimed site

11-5.1. No building foundation shall be erected upon a site reclaimed by Town sweepings or other refuse, except on recommendation of Geo-technical and Structural Engineer.

11-5.2. No building plans shall be approved on open nallahs public sewers and the like.

11-6. Protection of Existing Services

During the making of an excavation in connection with a building works or services, adequate precautions shall be taken to Secure the existing services.

11-7. Foundation Near drains

Where a building is to be erected adjacent to existing buildings, or near a drain/nallah, or an excavation at a distance less than depth of the said drain / nallah or excavation, or such as to affect the stability of drains / nallah, the owner, through a Structural Engineer, shall satisfy

THE SINDH GOVT. GAZETTE APRIL 04, 2002 477

11-Building Structure Design

the Authority that the foundations of the building have been carried down to a level safe guarding its stability.

11-8. Specifications

Specifications of Material Quality Control and workmanship will be of high quality and in accordance with the requirements of ACI Building Codes, Uniform Building Code (UBC) and ASTM Standards.

11-9. Testing of Materials

Regular testing will be carried out of materials such as Aggregates, Cement, Concrete and Reinforcing Steel and all Architectural materials the Quality Control and Quality Assurance Criteria laid down in standards of FIDIC, ASTM, OR ACI/UBC and Project Specifications. The Quality Assurance Program of the Architect / Engineer may also be followed.

11-10. Supervision

Construction supervision and quality assurance will be carried out by full time/top supervision by the designer/supervising engineers/architects/inspectors etc. as required in these Regulations. Contractor/Builder’s/Developers full time supervisory staff for the category of buildings in these Regulations shall carry out supervision and quality control.