Design / Bearings & joints

Expansion Joint

Movement at a deck expansion joint from the uniform temperature range (AASHTO LRFD 3.12.2.1.1, Procedure A), plus shrinkage and creep for concrete. Shows how far the joint opens and closes from the temperature it is set at, and the joint systems that usually cover that range.

Superstructure

Material

Expansion lengthPoint of fixity to the joint

Thermal coefficient, α6.0 concrete, 6.5 steel

µ/°F

Temperature

ClimateProcedure A, Table 3.12.2.1.1-1

Minimum, T_min

°F

Maximum, T_max

°F

Setting temperatureWhen the joint gap is set

°F

Other movement

Shrinkage + creep strainStill to occur after setting; concrete only

µε

Load factor, γ_TU1.2 for deformations (Table 3.4.1-1)

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