The presentation is based on concrete and starts with the objectives of the presentation and moves onto a review of the composition of concrete. It then moves towards RCC structures and covers points like methods used in the designing of RCC structures, the codes used and the functions of reinforcement. The topics covered after these are the grades of concrete, the workability of concrete, the water content of concrete and the different tests that concrete must pass. The next topic in the presentation is the different pacing conditions according to IS 456-2000 which is followed by the water and cement ratios and the strengths and grades of concrete. After this is covered Concrete mix and its types followed by various methods used for determining the life and strength, like the Limit State Method(LSM), of concrete. What follows this is an explanation of the technicalities of the strength of this material by looking at the stress strain curve, stress block parameters, calculations of how much load can be taken by the material, etc. The information that follows this is the modes of failures of RC beams followed by the effective span for a cantilever slabs along with an explanation of the different types of reinforcement that can be provided. After this will be the turn of the neutral axis and an analysis of the three cases that arise due to the position of the base after which will be covered the design of the continuous beams. The concluding topic will be that of the design of effective stairs covering points like the types of stairs, components of a staircase, the requirements of good staircase, longitudinal span of the stairs and load calculations.
[...] of reinforcing steel Grades of concrete Grades of steel Concrete (Review) What are the ingredients of concrete? Coarse Aggregate 4.75 mm) Fine Aggregate 4.75 mm) Cement ( Binding Agent ) Water (Potable) COARSE AGGREGATES Quality of Coarse Aggregate Gradation ( Well/ Poorly graded) Shape (Triangular/ Rounded) Durable Chemically inert. FINE AGGREGATES Quality of Fine Aggregate Grade (Coarse/Medium/Fine) Bulkage Free from deleterious materials CEMENT Function in Concrete-acts as binding material Types-OPC, Rapid hardening, sulphate resisting, PPC, Hydrophobic, Expanding, High alumina, Quick setting, High strength cement. [...]
[...] TU = CU 0.87 fy Ast = 0.36 fck xu,max b Ast = 0.36 fck xu,max 0.87 fy The reinforcement (Ast) so computed as above should be equal to or more than minimum reinforcement of of gross area for mild steel bars and of gross area for HYSD bars Calculate the minimum area of the steel to be provided for distributors (Asd) which is equal to of gross area for mild steel bars and of gross area for HYSD bars Calculate the spacing of distributors of dia ‘Ø' from the relation s=(AØ/Asd)1000 Where AØ=area of distribution of reinforcement bar The c/c spacing adopted should not exceed the least of 5d 450mm Calculate nominal shear stress Vu/ bd Refer Table 19 of IS:456 for minimum design strength of concrete Table 20 of IS:456 for maximum shear stress in concrete max) and clause for the value of ‘k' Sunshades are safe against shear and no shear reinforcement is provided since will be much less than k. [...]
[...] Aligizaki Default Design AA 603.1 Concrete technology Objectives On completion of this class, you will be able to State the codes used for RCC design Explains the functions of reinforcing steel Grades of concrete Grades of steel Concrete (Review) What are the ingredients of concrete? Coarse Aggregate 4.75 mm) Fine Aggregate 4.75 mm) Cement ( Binding Agent ) Water (Potable) COARSE AGGREGATES Quality of Coarse Aggregate Gradation ( Well/ Poorly graded) Shape (Triangular/ Rounded) Durable Chemically inert. FINE AGGREGATES Quality of Fine Aggregate Grade (Coarse/Medium/Fine) Bulkage Free from deleterious materials CEMENT Function in Concrete-acts as binding material Types-OPC, Rapid hardening, sulphate resisting, PPC, Hydrophobic, Expanding, High alumina, Quick setting, High strength cement. [...]
[...] What is a beam? What are the different types of beams? Cantilevers Simply supported Over Hanging Fixed Continuous What are the internal actions developed in a beam? Why Reinforcement is provided in beams To counteract the tensile weakness of concrete in tension zone. Where do we provide Reinforcement In tension zone How do we locate tension zone ? Neutral axis divides a beam cross section into two zones A compression zone A Tension zone Singly reinforced beam If steel reinforcement is provided in tension zone only , it is a singly reinforced beam Reinforcement in Simply Supported Beam Reinforcement in Cantilever Beam Assumptions The assumptions made in analysis and design of reinforced concrete sections for Flexure 456- 2000,clause 38.1 ) Stress- Strain Curve For Concrete Compressive strength of concrete = 0.67 fck Design Compressive strength of concrete = 0.67 fck /γm γm=Partial safety factor = 1.5 Design Compressive strength of concrete= 0.446 fck Stress Strain curve for Cold Worked Deformed Bar Stress Strain curve for Steel Bar with definite yield point Maximum strain in steel reinforcement = f y / 1.15 Es + 0.002 Design strength of steel = f y /γm γm=Partial safety factor = 1.15 Design strength of steel = 0.87 fy Analysis of a singly reinforced section To find Neutral axis Ascertain the type of section Find Moment of Resistance Stress Block Parameters Breadth of beam = b To find Neutral axis Equate force of compression to force of tension of the stress block diagram For equilibrium condition C=T 0.36 fckbxu= 0.87 f y A st x 0.87 f y A st .36fckb SUMMARY We have discussed about Singly Reinforced beams Depth of Neutral Axis of Singly Reinforced beams QUIZ A Singly reinforced beam is one in which steel will be provided in Only Tension zone Only compression zone Both None Frequently asked questions in Examination 1. [...]
[...] MODES OF FAILURES OF RC BEAMS Following are the possible modes of failure due to possible combination of shear and bending moment acting at a given section Diagonal tension failure Flexural shear failure Diagonal compression failure The possible failure of the section due to formation of tension cracks can be prevented by providing Shear reinforcement When the shear stresses exceeds the shear capacity of the concrete Shear reinforcement is provided Forms of shear reinforcement Shear reinforcement can be provided in any of the following forms or combination. [...]
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