摘要: |
Construction of bridges with long continuous lengths is definitely a preferred option now days. Advantages are lesser number of joints, better riding quality and durability of deck & wearing coat. Longer continuous lengths require joints with more expansion and contraction capacities. The solution then rests at modular strip seal type of expansion joint. This type of joint essentially consists of required number of strip seals assembled together. Capacity of single strip is about 70 to 75 mm. This is limited on account damage caused to wheels of the vehicles if gap is more than 80 mm. Therefore the capacity of modular type ot joint is always in multiples of 75 mm. The assembly of the strip seals makes load transfer of this type of joint in a unique pattern. This is totally different than load transfer mechanism of single strip seal. If the connection details are not prepared with due consideration to the said transfer mechanism, the joint will invariably fail early during service. The paper highlights the load transfer mechanism of the modular joint and discusses about the detailing of the deck slab for proper connection of the joint with it. |