Accommodating building deflection Dunia chatt sex
Since there are many uncertainties in long-term deflection estimation, a camber may be set as one-half of the computed total long-term deflections including the immediate deflections, as building owners and contractors prefer that the cambers are sized to accommodate only immediate deflection and a portion of the long-term deflection.
It is also worth noting that cambers less than ¼ inch tend to be ignored by concrete contractors because the value is within construction tolerance and error range.
When subjected to gravity loads, vertical reinforced concrete structural members, such as columns and shear walls, experience short-term and long-term shortening that is zero at the base and accumulates to be the maximum at the roof level.
The long-term deflections of girders, which pick up floors above, are particularly important and the deflection acceptance criteria should be more stringent than code-allowed values.
Depending on the sensitivity of nonstructural elements to building lateral story drift, the lateral design loads for wind story drift check can be chosen as 10-year, 50-year and 100-year return periods respectively.