What is load-bearing negative reinforcement? What do you mean by attaching reinforcement? What is a raft?

Load-bearing negative reinforcement refers to the longitudinal stress reinforcement located on the upper part of the beam bearing negative bending moment, commonly known as shoulder pole reinforcement and beam pressing iron. In some places, it is called rib covering. The bearing has negative reinforcement, which is relative. Generally speaking, it refers to the reinforcement used to offset the negative bending moment in the load-bearing part of the beam, commonly known as load-bearing reinforcement.

Negative reinforcement, also known as negative moment reinforcement. In the design of reinforced concrete structures, the reinforcement used to resist negative bending moment is called negative bending moment reinforcement. This concept is actually not very clear. The reason is that in the working stage of concrete members, the stress of steel bars is very complicated.

The type of raft foundation is closely related to the type of foundation soil and the distribution of soil layer. In engineering design, it is often encountered that the geotechnical layer below the basement floor is weathered residual soil layer, completely weathered rock layer, strongly weathered rock layer or moderately weathered soft rock layer, so natural foundation can be used as building foundation. The basement of a high-rise building is usually used as an underground parking garage, and there are not too many internal walls in the building, which limits the use of box foundation. Raft foundation can not only give full play to the bearing capacity of foundation, adjust uneven settlement, but also meet the space use requirements of parking garage, so it becomes an ideal foundation type. The main structural types of raft foundation are flat raft foundation and beam-slab raft foundation, and flat raft foundation is widely used in high-rise buildings because of its simple construction.

The building load is large and the foundation bearing capacity is weak. Concrete floor is often used to bear the building load and form a raft foundation, which has good integrity and can resist the uneven settlement of buildings.