Transcription of Expansion Joints: Where, When and How
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Expansion Joints: Where, When and How
Expansion Joints: Where, When and HowBy James M. Fisher, the most basic sense, the need for anexpansion joint in a structure dependson the consequence of not having anexpansion joint . Will the lack of anexpansion joint hamper or destroy thefunction of the facility, or cause damageto the structural or architectural compo-nents? The number and location of build-ing Expansion joints is a design issue notfully treated in technical literature. TheLRFD Specification(AISC, 1999) listsexpansion and contraction as a service-ability issue and provides the statementin Section L2, Adequate provision shallbe made for Expansion and contractionappropriate to the service conditions ofthe structure. ASCE 7-02 Minimum Design Loads forBuildings and Other Structures (ASCE,2002) states, Dimensional changes in astructure and its elements due to varia-tions in temperature, relative humidity,or other effects shall not impair the ser-viceability of the structure.
with no expansion joints or between expansion joints R 1 = 0.15, if the building is heated and air-conditioned R 2 = 0.33, if the building is unheated R 3 = 0.25, if columns are fixed base R 4 = 0.25, if the building has substan-tially greater stiffness at one end L allow = allowable length from Fig. 1 As a general rule, expansion joints
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