Concrete Cover For Columns Aci

Concrete which is not cast against earth but exposed to earth or weather the concrete cover should be.

Concrete cover for columns aci.

Aci clear cover requirements. The american concrete institute aci is a leading authority and resource worldwide for the development and distribution of consensus based standards technical resources educational programs certification programs and proven expertise for individuals and organizations involved in concrete design construction and materials who share a commitment to pursuing the best use of concrete. The rcc member which is cast against the earth and exposed to earth the concrete cover should be not less than 3 inches. Requirements for columns with tie reinforcement are given in aci 318 sections 10 7 6 and 25 7 2 and standard hook dimensions for ties are given in aci section 25 3 2.

It is desired to set minimum thickness of concrete cover as 65mm to account for possible construction errors and hence make sure that 50mm cover thickness is achieved. Cover is defined as the distance between the outer surface of the concrete to the inserted reinforcement. For beams and columns this is a sig nificant increase in cover since re. The footing is an example of this kind.

The clear spacing between ties must be at least 4 3 d agg. The program generates exact not approximate or empirical p mx my interaction surfaces for all sections according to user specified design criteria. The concrete column module designs concrete rectangular or circular columns against axial uniaxial or biaxial bending as well as shear based on aci 318 02 05 08 11 14 code provisions. Tie spacing requirements for reinforced concrete columns in buildings assigned to sdc a and b are given in figure 3.

Maximum deviation is defined for horizontal and vertical faces. Here i ll discuss the minimum concrete cover as specified in aci code. Depending on the shear strength requirements the required tie spacing may be less than that in the figure. For example for reinforced concrete member subjected to sea water the aci code specifies that thickness of concrete cover should be at least 50mm.

A reinforced square tie concrete column is designed to support an axial dead and live load of 135 and 175 kips respectively using uls design and factored lrfd load combinations according to aci 318 14 as presented in figure 01. Section 4 is the longest part of aci 117 covering tolerances for cast in place concrete for buildings including walls floors and slabs. Sider increased concrete cover less permeable concrete or other pro tective measures.