Bridge Plate Thickness

The strength index of steel is determined by elastic limit σ e. Yield limit σ y. And tensile limit σ u. The design is based on the yield strength of steel. High yield strength can reduce the self weight of the structure, save steel and reduce the cost. tensile strength σ U is the large stress that the steel can bear before failure. At this time, the structure loses its service performance due to large plastic deformation, but the structural deformation is large and does not collapse, which meets the requirements of the structure to resist rare earthquake‘ σ u/ σ The value of y can be regarded as the parameter of steel strength reserve.

Steel is characterized by high strength, light weight, good overall stiffness and strong deformation resistance, so it is particularly suitable for building long-span, ultra-high and ultra-heavy buildings; The material has good homogeneity and isotropy and is an ideal elastomer, which conforms to the basic assumptions of general engineering mechanics; The material has good plasticity and toughness, can have large deformation, and can well bear dynamic load; Short construction period; It has a high degree of industrialization and can be produced with a high degree of mechanization.

High strength steel should be studied for steel structure to greatly improve its yield point strength; In addition, new varieties of section steel, such as H-section steel (also known as wide flange section steel), T-section steel and profiled steel plate, should be rolled to meet the needs of long-span structures and super high-rise buildings.

The reason for the deformation of bridge slab?

1.The bridge slab assembly is unreasonable and the structure is poor, resulting in damage to the overall structure and bridge slab deformation.

2.After the bridge slab is built, the concrete cannot be poured immediately, and the long-term wind gently blows and the sun surface deforms.

3.The fulcrum structure spacing of bridge slab is too large and the load capacity is not enough.

4.The subgrade engineering for placing bridge slab is not firm, the slab is not placed, and the moisture-proof preventive measures are poor, resulting in foundation subsidence.

5.The speed of cast-in-situ concrete wall and column concrete is too fast, the one-time pouring exceeds the requirements, and the vibration range is too large.

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