Download design example of six storey building PDF

Titledesign example of six storey building
Tags Framing (Construction) Precast Concrete Masonry Prestressed Concrete
File Size811.4 KB
Total Pages54
Document Text Contents
Page 1

2010

Rowing engineer

[email protected]

Version 1

DESIGN TIPS

Page 28

27 | P a g e



o Shrinkage strips.


According to MARK FINTEL the use of Expansion joints in a building is a controversial issue. There is a
great divergence of opinion concerning the importance of expansion joints in concrete construction. Some
experts recommend joint spacing’s as low as 30 ft while others consider expansion joints entirely
unnecessary.


Joint spacing’s of roughly 100 to 200 ft for concrete structures seem to be typical ranges recommended by
various authorities. For steel structures a spacing of 200 ft is normal.


However, the spacing is most of the times also dictated by the following factors which determine the
location of such joints:


• New building adjoining existing building
• Long low building abutting higher building
• Wings adjoining main structure
• Long low connecting wings between buildings
• Intersections at wings of 'L', 'T', or 'U' shaped buildings.
• Soil strata in length of structure vary in nature -- better to have joints (such situation is very rare)
• Different type of foundations in structure (i.e. building founded piles and raft)





21. Actual concrete deflections are influenced by many factors which cannot be fully taken into account.
• Tensile strength of concrete a change in strength from 2.7 to 2.1 can increase deflections by 50%
• Modulus of concrete +/- 20%
• Early construction loading
• Shrinkage wrapping

Always remember load can only be estimated and even dead loads cannot usually be calculated to within 5%
accuracy. With this in mind not calculation need have more than 2 significant figures.




22. For high-risks facilities such as public and commercial tall buildings, design considerations against extreme
events (bomb blast, high velocity impact) is very important. It is recommended that guidelines on abnormal
load cases and provisions on progressive collapse prevention should be included in the current Building
Regulations and Design Standards. Requirements on ductility levels also help improve the building
performance under severe load conditions.

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