Expansion Joints in Buildings
Expansion joints should be provided in concrete structures to accommodate expansions due to the thermal effects. Concrete expands when it absorb the head and shrink when the heat is loss.
There are different guide lines to design the width of the expansion joint depending on the type of the structure. Method of designing a expansion joints elaborate here is based on the guide line "Expansion Joints in Buildings, Technical Report No 65" by Standing Committee on Structural Engineering of the Federal Construction Council.
They have given a chart that can be used to find the length of the structure which can have without a expansion joint depending on type of the structural form. However, they also have given equations to calculate the length of the building depending on temperature changes as well.
Following figure can be referred to find the maximum allowable building length without use of expansion joints for various design temperature changes. It should be noted that values obtained form the chart shall be modified according to the conditions mention bellow the chart.
According to the guide line, above chart is directly applicable to buildings of beam and column construction, hinge at base, and with heated interiors. When the conditions differ from this, following modification shall be done to values obtain form the chart.
In addition, we can calculate the width of the expansion joint consider the factors given in the guide line.
Expansion joints should be provided in concrete structures to accommodate expansions due to the thermal effects. Concrete expands when it absorb the head and shrink when the heat is loss.
There are different guide lines to design the width of the expansion joint depending on the type of the structure. Method of designing a expansion joints elaborate here is based on the guide line "Expansion Joints in Buildings, Technical Report No 65" by Standing Committee on Structural Engineering of the Federal Construction Council.
They have given a chart that can be used to find the length of the structure which can have without a expansion joint depending on type of the structural form. However, they also have given equations to calculate the length of the building depending on temperature changes as well.
Following figure can be referred to find the maximum allowable building length without use of expansion joints for various design temperature changes. It should be noted that values obtained form the chart shall be modified according to the conditions mention bellow the chart.
- If building will be heated only and will have hinge column bases, use the allowable length as specified in the chart.
- If building will be air conditioned as well as heated, increase the allowable length by 15 percent (Provided environmental control system will run continuously).
- If the building will be unheated, decrease the allowable length by 33 percent.
- If the building will have fixed column bases, decrease the allowable length by 15 percent.
- If the building will have substantially grater stiffness against lateral displacement at one end of the plan dimension, decrease the allowable length by 25 percent.
In addition, we can calculate the width of the expansion joint consider the factors given in the guide line.
I am searching for the Expansion Joints and equipments and then I found this blog which shows Piping and Plumbing with their fitting and measurement. Really useful post.
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