Given Beam Data: Slab Thickness, t=175 mm Effective Depth, d = 300 mm Width of web, bw=250 mm Material Properties Concrete, fe 24 MPa Steel, fy=415 Mpa The concrete slab has an equivalent width of 600 mm and casted monolithically with the beam. Assume that the steel bars will be distributed in one layer only and use 2010 NSCP. a) Determine the balanced steel ratio of the section in positive bending b) Determine the maximum steel ratio for the beam in positive bending for failure in tension c) If the slab has a thickness of 100 mm and the equivalent width of the concrete flange from the slab is 1200 mm, determine the balanced steel ratio of the section for positive bending d) Determine the steel ratio if the section is used for negative bending

Given Beam Data: Slab Thickness, t=175 mm Effective Depth, d = 300 mm Width of web, bw=250 mm Material Properties Concrete, fe 24 MPa Steel, fy=415 Mpa The concrete slab has an equivalent width of 600 mm and casted monolithically with the beam. Assume that the steel bars will be distributed in one layer only and use 2010 NSCP. a) Determine the balanced steel ratio of the section in positive bending b) Determine the maximum steel ratio for the beam in positive bending for failure in tension c) If the slab has a thickness of 100 mm and the equivalent width of the concrete flange from the slab is 1200 mm, determine the balanced steel ratio of the section for positive bending d) Determine the steel ratio if the section is used for negative bending

Materials Science And Engineering Properties

1st Edition

ISBN:9781111988609

Author:Charles Gilmore

Publisher:Charles Gilmore

Chapter12: Composite Materials

Section: Chapter Questions

Problem 12.7P: Estimate the transverse tensile strength of the concrete in Problem 12.6.

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2. Tensile strength of concrete is about: (20-35)% of compressive strength (45-70)% of compressive strength None of the above. Tension controlled section Balanced section Compression-controlled section 4- The reduction factor (0) is equal to 0.9 if the: Es 2 Ety + 0.003 Es S Ety + 0.003 Es Ety 5- The design method which use the factored loads is - Working stress method - Ultimate design Method - None of above 6- If p< Po therefore the section is - Under reinforced - Over reinforced - None of above
Question 2A composite bar is made up of a steel strip 2 mm thick and 12 mm wide, sandwichedbetween two aluminium strips each 3 mm thick and 12 mm wide. The three strips areheld together by two rivets of 5 mm diameter each.2.1 Make a neat detailed sketch of the assembly.2.2 If the three strips are fastened together at 15 0C, determine the shear stress set up inthe rivets when the temperature is raised to 21 0C.Note: The resistance of a rivet in double shear may be taken as 1.75 times the resistancein single shear.(For steel: E = 200 GPa and α = 11×10 -6/ 0C)(For aluminium: E = 70 GPa and α = 22×10-6/0C)
Reinforce Concrete DesignTopic: Slab
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