Structural Guide

Structural loads, structural analysis and structural design are simply explained with the worked example for easiness of understanding. Element designs with notes and discussions have added to get comprehensive knowledge. Also, construction materials, shoring system design, water retaining structures, crack width calculations, etc. have discussed in addition to other aspects. 

Staircase Design

Staircase design using eurocode 2

Waist          = 150 mm
Rise            = 150 mm 
Treads        = 250 mm
Finishes      = 1 kN/mm2
Span          = 3.3 m
Live Load  = 4 kN/mm2
Cover        = 25 mm
Concrete    = 25 N/mm2 

Load Calculation

Total Dead Load  = 5.625 kN/m2

Variable load        = 4 kN/m2

Ultimate load        = 1.25*5.625 + 1.5*4

                            = 13.03 kN/m2

Moment               = W*l2/8
                            = 13.03*(3.32)/8

                            = 17.74 kNm

d                          = 150-25-12/2

                            = 119 mm

k                          = M / (b*d2*fck)

                            = 17.74*106/ (1000*1192*25)

                            = 0.05

z                          = (d/2)[1+(1-3.53k)0.5]  ≤ 0.95d
                           =   (d/2)[1+(1-3.53*0.05)0.5] ≤ 0.95d

                           = 0.954d  ≥ 0.95d

Hence

z                          = 0.95d

                            = 0.95*119

                            = 113.05

As                        = M/ (fyd* z)

                            = 17.74*106 / (500*113.05)

                            = 313.84 mm2

Proved T10 @ 150mm c/c

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