Question

Why are allowances made for the expansion of the steel parts in building bridges ?
​

Answer 1

$\huge\color{indigo}{\mid{\fbox{\tt{αηsωεя}}\mid}}$

Designed to span gaps between structural elements, expansion joints are necessary to absorb movement, accommodate shrinkage and creep effects and changes in temperature on reinforced concrete, pre-stressed concrete and steel structures, and particularly on bridge decks.

Answer 2

Answer:

An expansion joint or movement joint is an assembly designed to hold parts together while safely absorbing temperature-induced expansion and contraction of building materials, and vibration, or to allow movement due to ground settlement or seismic activity. They are commonly found between sections of buildings, bridges, sidewalks, railway tracks, piping systems, ships, and other structures.