When the deflection of beam-slab structure members is too large, the crack width is too wide, too long, or the steel bar is seriously corroded, or the concrete in the compression area is crushed, reinforcement measures should be taken.
When the deflection of beam-slab structure members is too large, the crack width is too wide, too long, or the steel bar is seriously corroded, or the concrete in the compression area is crushed, reinforcement measures should be taken.
The main reasons for these problems are as follows:
Errors in design and construction
Because the load is not considered thoroughly in the design, the calculation model and the calculation sketch are wrong, the application of the calculation formula does not meet the conditions for the application of the formula, especially in the present application of computer calculation, the data input is wrong, etc.
The strength of concrete can not meet the design requirements during construction. When the negative reinforcement is misplaced or trampled down during construction, the size of the concrete section is too small, especially the thickness of the slab can not meet the requirements, the steel reinforcement is mismatched or mismatched, and the material is used improperly, all of which can cause the structure to fail to meet the service conditions.
Serious overload or functional change
When the structure is seriously overloaded due to improper use, it is easy to cause insufficient bearing capacity of the structure. The change of use function refers to the change of industrial buildings due to technical transformation and production technology, and civil buildings due to the change of use, such as balcony to kitchen.
Environmental impact
In the external environment and use conditions, structural materials are always eroded by the external environment, resulting in deterioration of material performance, which can not meet the design requirements. For example, the corrosion of acid, alkali or gas in smelting and chemical plants on reinforced concrete or steel structures, cracks in structures caused by high temperature, high humidity, freeze-thaw cycles and changes in temperature difference between day and night, etc.
Uneven Settlement of Foundation
Because of the uneven settlement of the foundation, the bearing capacity of the structure is insufficient and cracks appear.
What reinforcement methods are commonly used when the bearing capacity of beams is insufficient?
Reinforcement with CFRP
Reinforcement with Increased Section
External Sticking Steel Plate Reinforcement Method
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