Reinfocing details of column
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This document provides details about reinforcing concrete columns and footings. It discusses that columns are vertical members that support loads and transmit them downward. Reinforcement is added to reduce column size and resist compression and bending forces. The main reinforcement runs longitudinally and is arranged in square, rectangular, or circular patterns. Minimum and maximum longitudinal steel requirements are specified. Transverse reinforcement is also included to help position longitudinal bars and confine the concrete.
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Construction process''column,beam,slab''
The document describes the construction process for columns, slabs, and beams in reinforced concrete structures. It discusses the materials used and the typical steps involved, which include:
1) Layout and formwork installation
2) Placement of reinforcing steel based on structural designs
3) Pouring and finishing of concrete
4) Curing of concrete to gain full strength over 28 days
The columns transfer loads vertically through reinforced concrete that is mixed on site or delivered by ready-mix trucks. Slabs and beams are constructed through similar processes of steel reinforcement, formwork, concrete placement and curing.
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Get PPT here
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Get PPT here
https://civilinsider.com/difference-between-one-way-slab-and-two-way-slab/
What is a Slab?
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One way slabs are the slabs in which most of the loads are carried on the shorter span. The ratio of longer span to shorter span is equal to or greater than two or when the slab is supported by beams only along two opposite sides slab then the slab behaves as a One-way slab.
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Housing is an important activity that directly indicates the standard of living of the people, with the increase in growth of population due to rapid industrialization scarcity of developed land, the need for multi-storeyed housing complex has increased to a considerable extent , so people turned to multi-storeyed residential apartments instead of individual houses, when city development reached a maximum development of suburban’s areas began the people living in the city should have advocate housing for comfortable and peaceful living.
seismic behaviour of beam column joint
- Beam-column joints are the weakest points in reinforced concrete frames during earthquakes due to stresses that cause cracking and failure. There are two main types of failure: shear and anchorage.
- Proper design of beam-column joints including use of closed loop ties, intermediate bars, wider columns, and straight beam bars inserted into the column improves earthquake resistance by resisting distortion and improving concrete confinement.
- Innovative techniques for strengthening joints include fiber reinforced concrete and FRP wrapping to prevent cracking and increase strength. Well designed joints are crucial to avoiding damage during seismic activity.
Slabs and types
Slab is a thin concrete structure used for flooring that can be square, rectangular, or circular. Slabs vary in thickness from 4-6 inches depending on load and are made of cement, coarse aggregate, fine aggregate, and reinforcement bars. There are several types of slabs including one-way slabs which carry load in one direction, two-way slabs which carry load in two directions, joist slabs which have concrete ribs for support, and precast slabs which are constructed off-site and transported. Other slab types include flat plates, flat slabs, waffle slabs, hollow core slabs, and composite slabs which incorporate a steel deck.
Presentation on Slab, Beam, Column, and Foundation/Footing
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Details about the tie, stirrup, anchor, hook, lap length, corner reinforcement
Based on the ACI Design Code
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This document discusses design provisions for composite beams and columns. It covers general provisions, available strength calculations using plastic stress distribution and strain compatibility methods, design of encased composite columns, calculation of effective rigidity and nominal compressive strength, requirements for shear connectors, and design of built-up composite columns.
formwork Bco (1) final.pdf
Formwork is used to pour concrete into molds to form structures. It can be made from steel, wood, aluminum, or prefabricated forms. Good formwork is easy to remove, economical, leak-proof, rigid, durable, and provides smooth concrete surfaces. Formwork design considers categories like conventional, modern panel systems, and prefabricated modular systems. Steel, plywood, plastic, and aluminum are common materials. Proper bracing and erection sequences are needed to construct columns, beams, walls, stairs, and avoid failures during pouring.
Lecture note on column design
This document discusses reinforced concrete columns. Columns act as vertical supports that transmit loads to foundations. Columns may fail due to compression failure, buckling, or a combination. Short columns are more prone to compression failure, while slender columns are more likely to buckle. Column sections can be square, circular, or rectangular. The dimensions and bracing affect whether a column is classified as short or slender. Longitudinal reinforcement and links are designed to resist axial loads and moments based on the column's effective height and end conditions. Design charts are used to determine reinforcement for columns with axial and uniaxial bending loads. Examples show how to design column reinforcement.
Reinforced concrete column
The document discusses reinforced concrete columns, including their functions, failure modes, classifications, and design considerations. Columns primarily resist axial compression but may also experience bending moments. They can fail due to compression, buckling, or a combination. Design depends on whether the column is short or slender, braced or unbraced. Reinforcement is determined based on the loads applied, including axial load only, symmetrical beam loading, or loading in one or two bending directions. Links are included to prevent bar buckling. Examples show how to design column longitudinal reinforcement and links for different load cases.
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Reinfocing details of column
- 1. REINFORCING DETAILS OF RCC COLUMN &FOOTING
- 2. Column • Columns are vertical compression members of a structural frame intended to support the load-carrying beams. They transmit loads from the upper floors to the lower levels and then to the soil through the foundations. • Usually columns carry bending moment as well, about one or both axes of the cross section, and the bending action may produce tensile forces over a part of the cross section • Reinforcement are provided in order to reduce the size of the column
- 3. • The main reinforcement in columns is longitudinal, parallel to the direction of the load and consists of bars arranged in a square, rectangular, or circular shape
- 4. • Main steel is provided to resist compression load along with concrete • Reinforcement Requirements (Longitudinal Steel Ast) min Ast 0.8 % of C/S max Ast 6% of C/S
- 5. • The object of stipulating a min. percentage of steel is to make provision to prevent buckling of column due to any accidental eccentricity of the load on it • For stipulating a max. percentage of steel is to provide reinforcement with in such a limit to avoid congestion of reinforcement which would make it very difficult to place the concrete and consolidate it
- 6. • Min. 4 bars in rectangular/square column and min. 6 bars in circular shape column • The bar shall not be less than 12mm • The nominal cover shall any case not be less than 40mm. • In our site they provided 40mm cover • Min. distance b/w individual bars -the dia of larger bar -5mm more nominal max. size of coarse aggregate
- 7. • Spacing of longitudinal bars shall not exceed 300mm from the periphery of the column • in our site they provided rectangular and circular columns • For rectangular column • -distributed the reinforcement equally on four sides
- 8. • - the no. of bars in a column are varying from 10, 12,14, 16, of varying diameter • They provide different diameter main bars i.e., 16mm,20mm,25mm • In our site 450mm dia. circular column Is used • For circular column they provide 6 nos 20mm dia. And 6 nos 16mm dia • The effective length provide is 48 times the dia . Of bar
- 9. TRANSVERSE REINFORCEMENT • In order to maintain the position of longitudinal reinforcement and also to prevent their buckling which may cause splitting of concrete. It is also assist confining the concrete • The diameter of transverse reinforcement shall not be less than 1/4th dia. of main bar in no case less than 5mm • The spacing of lateral ties the least lateral dimension of the column/16times the dia. Of main bars max spacing is 300mm
- 10. • In our site they provided lateral ties of diameter 8mm at a spacing 200 and 250mm c/c