Eurocode and KDS

With Eurocode selected, the two temperature boxes become the shade air temperatures of the site (EN 1991-1-5 6.1.3.2). The tool turns them into the uniform bridge temperatures T_e,min and T_e,max for the chosen deck type (Figure 6.1: steel deck, composite deck or concrete deck), measures contraction and expansion from the initial temperature T₀ (10 °C recommended in Annex A), and adds the allowance for bearings and joints from 6.1.3.3(3): 20 K each way, or 10 K when the setting temperature is fixed. Expansion coefficients follow Annex C (concrete 10, steel 12 ×10⁻⁶/°C) and no load factor is applied to the movement. The skew split and the 15 % reserve are the same as for AASHTO. Creep and shrinkage of concrete decks stay outside the tool under AASHTO and Eurocode. With KDS selected the temperature boxes hold the bridge temperature range of KDS 24 12 21 Table 4.11-1 for the bridge type and climate (ordinary or cold region), the thermal movement gets the larger temperature load factor 1.2 of KDS 24 12 11 because joint movements are taken from the ultimate combinations, and concrete decks add the shrinkage and creep terms of KDS 24 90 11: shrinkage as a 20 °C temperature drop and creep with a creep coefficient of 2.0, both reduced by the age of the concrete when the joint is set. The tool also checks the maximum surface gap of the joint clause, movement plus a 25 mm minimum gap, against 100 mm for one gap and 80 mm per gap for modular joints. The shrinkage and creep expression is borrowed from the bearing movement clause of KDS 24 90 11, because the joint clause only points to the load combinations.