Final answer:
Many beam bridges use steel and concrete as their primary construction materials. Two primary materials used in the construction of many beam bridges are steel and concrete. Steel provides high tensile strength, and concrete offers impressive compressive resistance.
Step-by-step explanation:
Many beam bridges use primarily steel and concrete as the main materials for construction. Steel is often used for the beams themselves as it is strong and can withstand heavy loads. Concrete is used for the bridge deck and piers as it provides stability and durability.
Two primary materials used in the construction of many beam bridges are steel and concrete. Steel provides high tensile strength, and concrete offers impressive compressive resistance. These materials, along with maintenance to prevent corrosion, ensure the longevity and safety of the structures.
Many beam bridges use the combination of steel and concrete as primary construction materials. Steel is often used in the form of I-beams to provide the strength needed to support large loads and spans, as it efficiently reduces bending strains. Concrete, especially new types of fast-drying and self-healing cement, provides durability and mass, which helps to stabilize the bridge structure.
The integration of steel and concrete has been prevalent in bridge construction due to the complementary properties of the two materials. Steel offers high tensile strength, ideal for withstanding forces that might cause a bridge to pull apart, while concrete is excellent in compression, resisting forces that push it together. Additionally, Thermal expansion joints are used to prevent damage from temperature changes, allowing the bridge to expand and contract without buckling.
Without proper maintenance, steel components of bridges can suffer from corrosion, as seen in Figure 14.1.1 with the Nandu River Iron Bridge. This can lead to structural failures, such as the collapse of the Silver Bridge in 1967, highlighting the importance of using durable materials and regular upkeep.