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(at support) and 50% at mid-span!

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Moment at C = -9.43 kNm

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Pattern loading

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Influence lines and gravity load patterns for a continuous beam

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Width of a beam shall be less than or equal to the dimension of the column into which

they frame

Beam widths of 200 mm, 250 mm and 300 mm are commonly used. Beam widths of

230 mm are also commonly used in India so that the infill masonry wall resting on a

beam is flush with it

The ratio of overall depth, D, to the width, b, in rectangular beam sections lied in the

range 1.52. For beams carrying very heavy loads it may be even 3 or more!

For simply supported beams, span/overall depth 10

For continuous beams, span/overall depth 12 to 15

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In framed structures, the maximum amount of tension reinforcement in a beam is usually

restricted to 1.4% to 1.5%. This generally corresponds to a Mu/bd2of about 4 to 4.5. Such

values of Mu/bd2 will result in a doubly reinforced section. In general, it is desirable to

design beams with a tension steel content of 0.5 to 0.8 times pt,lim

For simply supported slabs, effective depth span/25

For continuous slabs, effective depth span/32

Amount of tension reinforcement in a slab 0.3% - 0.4%

Column dimensions should not be smaller than the size of the largest beam framing into

the column. Estimate the size very roughly by equally dividing the total gravity load

amongst all columns and dividing this load with the allowable axial stress for the concrete

grade in the column

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Loads

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Approximate analysis for vertical loadssubstitute frame method

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Column moments from frame analysis

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