Because bridges expand and contract with the change in temperature. The expansion joints allow the bridge to 'flex' as the temoerature rises and falls, ensuring the structure doesn't buckle or collapse.
Civil engineers and Structural engineers.
To assist in removing obstacles and classifying bridges.
Engineers design things such as bridges or pipes based on scientific principles.
Depends on the type of engineer. Originally, it meant one who cared for, and operated engines- like a railroad locomotive. While it still means that, there are other types of engineers. Civil engineers design roads, bridges, dams, and large buildings. Electrical engineers design electrical distribution and supply systems. Chemical engineers design chemical manufacturing processes. Military engineers may build bridges, destroy bridges, place or clear minefields, build obstacles, etc.
Different engineers do different things. Civil engineers may design dams, bridges, roads. Mechanical engineers design factories, production lines. Electrical engineers may design power systems, and chemical engineers design chemical manufacturing processes. Safety engineers design safe working procedures, and operating engineers operate boilers, locomotives, cranes, and large equipment. Aeronautical engineers design airplanes and spacecraft, and Marine engineers design ships. And there are others as well.
Civil Engineers and Architects design bridges and buildings.
They usually try to make the car they are designing, more fuel efficient, safer, and try to come up with ways to improve the current design.
That is to account for thermal expansion.
Well, friend, one beautiful example of thermal expansion being used for good stewardship is in the design of bridges. Engineers use the principles of thermal expansion to ensure that bridges have room to expand and contract with temperature changes, preventing damage and ensuring their longevity. It's a wonderful harmony between nature's laws and human ingenuity, creating structures that can stand the test of time while respecting the environment.
All materials expand when heated and contract when cooled. Bridges are especially vulnerable because the entire bridge is surrounded by air, and it doesn't have the ground below to act as a heat sink. Without the expansion slots, the bridge would run the risk of buckling when heating, and pulling apart when cooling. This could damage a bridge. Uncontrolled or unsupported cracks, for example in the middle of a span could be very dangerous.
Engineers prevent the expansion of solids from damaging structures by incorporating expansion joints into the design. These joints allow materials to expand and contract without causing stress or damage to the structure. Proper materials selection and planning for thermal expansion also play a crucial role in preventing damage.
Civil engineers and Structural engineers.