Structure for relieving cracking of steel bridge deck

A structure for relieving cracking of a steel bridge deck, comprising a steel bridge deck and a plurality of U-ribs welded and fixed to a bottom of the steel bridge deck, and further comprising a plurality of iron-based shape memory alloy fixing units, filling units, a structural layer, and test wires;

• the plurality of Fe-SMA fixing units are arranged in a length direction of the steel bridge deck, and each Fe-SMA fixing unit is arranged at a top of the steel bridge deck and above a welding connection part between the corresponding U-rib and the steel bridge deck;
• a reserved filling space is defined between two adjacent Fe-SMA fixing units;
• the filling unit is arranged in the reserved filling space;
• the structural layer is arranged at tops of the Fe-SMA fixing unit and the filling unit;
• and
• positive and negative wiring holes are formed in the structural layer;
• and the test wires include a positive test wire and a negative test wire, wherein the positive test wire penetrates through the positive and negative wiring holes and electrically connects to one ends of each set of Fe-SMA fixing units respectively, and the negative test wire penetrates through the positive and negative wiring holes and electrically connects to the other ends of each set of Fe-SMA fixing units respectively.