Development of Tolerance Limits for Imperfections in Construction of Reinforced Concrete Buildings

doi:10.3850/978-981-08-7920-4_S2-S52-cd

Development of Tolerance Limits for Imperfections in Construction of Reinforced Concrete Buildings

Qaiser Uz Zaman Khan, Qaisar Abbas and Fiaz Tahir

Department of Civil Engineering, University of Engineering and Technology Taxila, Pakistan.

ABSTRACT

In this research work, effects of various types of imperfections on structure’s serviceability and on safety margin are evaluated. No structure is built exactly level, plumb, straight, and true in line. Tolerances are the means used to establish permissible variations in dimensions and locations as per plan and specifications. During course of execution of structure, various imperfections may result and have impact on structure serviceability and aesthetics. Impact of these imperfections depends on type and value as well as location of structural component. ACI Code 117-90 addresses various types of imperfections and defines values of these tolerances. Sometimes imperfections generated accidently or lack of knowledge or due to ignorance may push the structure into unserviceable zone or near to failure. Tolerances are defined in contract specification books for performance and appearance point of view. Design must be governed by tolerances in order to optimize degree of acceptance.

Keywords: Imperfections, Tolerance limits, Concrete strength, Concrete cover, Serviceability, Safety margin, Plumb.

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