Deflections in Concrete Slabs and Beams (Technical Report)

السلام عليكم ورحمة الله وبركاته

تقرير عن كيفية حساب ال deflection في البلاطات

نبذة عن الكتاب
The primary objective of the research on which this report is based was
to provide practical guidance on procedures for design of concrete
structures at the serviceability limit state. In considering
serviceability, it became clear that the primary area of concern is
deflection; the report therefore concentrates on this aspect of design.
Design at the serviceability limit state is reviewed in relation to both
BS 8110(1) and Eurocode 2. It should be noted that the National Annex
to Eurocode is still under development. Unless otherwise stated,
information in this report is based on BS EN 1992-1-1 :2004.

Estimating deflections is not an exact science as there are many
unknowns at the design stage and considerable variability in the
material and environmental properties. In order to address these issues
parameter studies were carried out. These showed that the concrete
tensile strength, extent of cracking and elastic modulus are the most
significant parameters.
For ease of use, the Report is divided into three Parts as follows:

Part One, Design provides guidance on using a range of analysis methods
(both hand and computer) to carry out rigorous design at the
serviceability limit state.

Part Two, Worked examples and spreadsheets contains worked examples,
with a commentary, for the design of simply-supported slabs to Eurocode 2
and flowcharts for deflection calculation to both Eurocode 2 and BS
8110. In parallel, design
spreadsheets (to BS 811 0 and Eurocode 2) have been developed that
include rigorous methods for design at the serviceability limit state.

Part Three, Background deals with the background to the deflection
clauses in the two codes and includes comparisons with international
practice. One of the key recommendations is that the impact of early-age
construction loading on long-term
deflections should be recognised; for cases where this might be
critical, a method of addressing early-age loading is proposed. So that
the various chapters can be read in isolation, a few sections are
repeated to ensure that every aspect is covered fully at
each appropriate point.

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