ACI 315-80 PDF

The Seismic Design Handbook pp Cite as. This chapter covers various aspects of seismic design of reinforced concrete structures with an emphasis on design for regions of high seismicity. Because the requirement for greater ductility in earthquake-resistant buildings represents the principal departure from the conventional design for gravity and wind loading, the major part of the discussion in this chapter will be devoted to considerations associated with providing ductility in members and structures. The discussion in this chapter will be confined to monolithically cast reinforced-concrete buildings. The concepts of seismic demand and capacity are introduced and elaborated on.

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Presented By Er. Sc struct. According to USA President Herbert Hoover, who was an engineer before he became a politician, said: The great liability of the engineer …compared to men of other professions……is that his works are out in the open where all can see them. His acts ….. He cannot argue them into thin air….. He cannot, like the politicians, screen his shortcomings by blaming his opponents…. If his works do not work……he is damned. Detailing is as important as design since proper detailing of engineering designs is an essential link in the planning and engineering process as some of the most devasting collapses in history have been caused by defective connections or DETAILING.

Detailing is very important not only for the proper execution of the structures but for the safety of the structures. For the RCC members for most commonly used for buildings we can divide the detailing for Slabs-with or without openings. Rectangular,circular,non-rectangular-pyramid slab,triangular etc balcony slab, loft slab, corner slab etc.

Beams — With or without openigs. Apart from the detailing for the above there is a different detailing required for the Rehabilitation and strengthening of damaged structures. Error occurred because Correct rebar dia was covered by a dimension line.

Prepare bar-bending schedule, if necessary. Indicate proper cover-clear cover, nominal cover or effective cover to reinforcement. Use commonly available size of bars and spirals. For a single structural member the number of different sizes of bars shall be kept minimum. The grade of the steel shall be clearly stated in the drawing. Deformed bars need not have hooks at their ends. Show enlarged details at corners, intersections of walls, beams and column joint and at similar situations.

Congestion of bars should be avoided at points where members intersect and make certain that all rein. Can be properly placed. In the case of bundled bars, lapped splice of bundled bars shall be made by splicing one bar at a time; such individual splices within the bundle shall be staggered. Make sure that hooked and bent up bars can be placed and have adequate concrete protection. Indicate all expansion, construction and contraction joints on plans and provide details for such joints.

The location of construction joints shall be at the point of minimum shear approximately at mid or near the mid points. It shall be formed vertically and not in a sloped manner. Where splices are provided in bars, they shall be , as far as possible, away from the sections of maximum stresses and shall be staggered. Only closed stirrups shall be used for transverse rein.

For members subjected to torsion and for members likely to be subjected to reversal of stresses as in Seismic forces. To accommodate bottom bars, it is good practice to make secondary beams shallower than main beams, at least by 50mm.

A reinforced column shall have at least six bars of longitudinal reinforcement for using in transverse helical reinforcement. A min four bars one at each corner of the column in the case of rectangular sections. Keep outer dimensions of column constant, as far as possible , for reuse of forms.

Preferably avoid use of 2 grades of vertical bars in the same element. Reinforcement shall not extend across an expansion joint and the break between the sections shall be complete. Flexural reinforcement preferably shall not be terminated in a tension zone. Bars larger than 36mm dia. Shall not be bundled. Lap splices shall be not be used for bars larger than 36mm dia. Except where welded.

Where dowels are provided, their diameter shall not exceed the diameter of the column bars by more than 3mm. The building plan DX-3 shows the slabs in different levels for the purpose of eliminating the inflow of rainwater into the room from the open terrace and also the sunken slab for toilet in first floor. The building plan DX-A3 is one in which the client asked the architect to provide opening all round.

Minimum and max. A min. Variations than the floor slabs. This is required to take care of temp. It is advisable to not to use 6mm bars as main bars as this size available in the local market is of inferior not only with respect to size but also the quality since like TATA and SAIL are not producing this size of bar. The stirrups shall be min. The hooks shall be bent to degree. Prakash Rao. IS Reinforced hand book by Reynold.

C Members. We are thankful to Er. Rangarajan for enlightening some of the detailing technique for the most commonly encountered RCC members in buildings. This presentation will surely help engineers to learn the reinforcement detailing of RCC members.

I am looking for detailing and construction technique re. Presentation on Reinforcing Detailing Of R. Reply Link. Noel September 4, at am. Boomesh January 20, at am. Cancel reply. Civil Engineering Forum. Top Contributors You can list yourself here by submitting civil engineering related topics to us.

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Presentation on Reinforcing Detailing Of R.C.C Members

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Presented By Er. Sc struct. According to USA President Herbert Hoover, who was an engineer before he became a politician, said: The great liability of the engineer …compared to men of other professions……is that his works are out in the open where all can see them. His acts ….. He cannot argue them into thin air….. He cannot, like the politicians, screen his shortcomings by blaming his opponents…. If his works do not work……he is damned.

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