U Value Of Reinforced Concrete Wall

Reinforced concrete cantilever retaining wall analysis and design aci 318 14 reinforced concrete cantilever retaining walls consist of a relatively thin stem and a base slab.

U value of reinforced concrete wall.

For a 6 inch slab r value would be between 0 6 and 1 2. U values of typical building methods u values overall coefficient of heat transmission indicate the heat flow through materials the higher the figure the higher the heat loss. Concrete block walls u values r values. U value has an inverse relationship to r value.

The base is divided into two parts the heel and toe. The steady state thermal analysis shows the total isothermal r value for the wall with the ability to factor in thermal breaks such as metal ties or solid concrete sections. The better the insulation quality. Reference table for u values u value is the coefficient of transmission i e the transmission of heat through the materials which compose the building s envelope or outer shell.

A reasonable r value for a normal concrete slab can be estimated using an r value the thermal resistance per inch of thickness between 0 1 and 0 2 and multiplying it times the slab thickness. The stem may have constant thickness along the length or may be tapered based on economic and construction criteria. The u value is the measure of heat transmittance through a material and the lower the u value the less heat is transmitted through a construction i e. Slenderness ratio is equal to least of l t or h t where l is effective length of wall h is effective height of wall t is thickness of wall if 12 the wall is short and if 12 the wall is slender.

As we said before the r value measures the thermal resistance of a material. This simple u value calculator can help you quickly check your designs or plans to see if they are likely to achieve bs en iso 6946 2017 compliance. Concrete sections and therefore has been tempered with u value average to account for the restricted conduction zones affected by solid concrete. A useful tool for designers architects and the general public to quickly calculate the u values of different elements within a building.

For concrete the k value depends on its bulk density and the moisture content in service. Cibse guide table a3 1 1980. U value calculator version 3 70. In reinforced concrete wall the percentage of steel provided is greater than 0 4 and is designed similar to reinforced concrete columns.

For instance if you have a material with an r value of 12 attached to another material with an r value of 3 then both materials combined have an r value of 15. Calculating the inverse of that 1 r would give you a u factor in the range of 1 67 to 0 83.