What is the reason for the suspension bar in the steel bar, and what is the difference between the b

The suspension bar is a kind of steel bar that improves the shear ability of the beam to bear the concentrated load, and the shape is like ingots, also known as ingots.

At the intersection of the secondary beam and the main beam, cracks are generated at the top of the secondary beam under the action of negative bending moment, and the concentrated load can only be transmitted to the belly of the main beam through the compression zone of the secondary beam. This effect is about in the range of times the beam height on both sides of the main beam at the concentrated load application point, which can cause the main tensile failure oblique crack. In order to prevent this damage, additional transverse reinforcement is arranged on the main beam on both sides of the secondary beam, and the concentrated load located at the lower part of the main beam or within the height range of the main beam section should all be borne by the additional transverse reinforcement (suspension bar, stirrups).

The effect of the suspension bar is due to the large concentrated load action of a certain part of the beam, in order to make the beam body not produce local serious damage, the concentrated force is transmitted to the top of the beam, and the material of the beam body is set up at the same time, and the material of the beam body is set up at the same time, and the shear force is mainly arranged in the part where there is a large sudden change in shear force, so as to prevent the part from producing excessive cracks and causing the destruction of the structure.

In the main beam, a kind of longitudinal stressed steel bar that bears the concentrated load of the secondary beam. In addition to the support of the main beam for the secondary beam, there is also a hanging bar when the column on the beam is used.

The suspension bar in the steel bar is generally used at the junction of the main and secondary beams, and the main purpose is to prevent the bottom of the main beam from cracking, affecting the structural function and the safety of use.

Bending rib - the support is located in the upper part of the beam (generally 1 3L is taken when there is no explanation), and bears the negative bending moment; The middle is located at the lower part of the beam, bears the positive bending moment of the beam, and the whole body is bent to the lower part of the beam by the upper length of 1 3L at the beam support, to the other branch.

The steel bars that bend at the two ends are vividly called hanging bars. Bending at one end is called bending steel bar.

The suspension bar makes the beam body not produce local serious damage, and at the same time makes the material of the beam body play its respective role and is set up, which is mainly arranged in the shear force has a large abrupt change in the part, so as to prevent the part from producing excessive cracks and causing the destruction of the structure, in short, the suspension bar effect is beneficial to the shear resistance! The bent steel bar is in the main beam, and bears a kind of longitudinal stress reinforcement of the concentrated load of the secondary beam. The lower (or upper) longitudinal tensile reinforcement of the concrete structural component is bent to the upper (or lower) part of the component according to the specified position and angle, and meets the anchoring requirements of the reinforcement.

Requirements for the structure of bent steel bars in the beam: according to the "Code for Design of Concrete Structures", in the reinforced concrete beam with binding skeleton, when the bent steel bar is arranged, the anchorage length should be left outside the bending end point of the bent steel bar, and its length should not be less than 20d in the tension area and 10d in the compression area; Hooks should be set at the end of the smooth reinforcement. Rebar located on both sides of the bottom layer of the beam should not be bent.

The role of bending reinforcement: the bending reinforcement can bear the positive bending moment as well as the longitudinal tension reinforcement near the middle of the span; After bending near the support, the bending section can bear the main tensile stress generated by the bending moment and shear force. The bent horizontal section can sometimes also withstand negative moments at the support.

The bending ribs are set at the two ends of the beam or the cantilever beam support, which is shear resistant. The suspension bar is at the secondary beam support on the main beam.

First, the force length is not the same.

Second, the force method is different.

Third, the length of the steel bar is not the same.

Fourth, the force is different.