What Is Beam Shear?

Supported by the support, the external forces to be carried are mainly transverse and shear forces, and the main deformation component is called beam. The beam supports the total weight of the components and roof in the upper frame of the building and is the most important part of the upper frame of the building. There are different names depending on the specific position, detailed shape, and specific function of the beam. The direction of most beams is consistent with the cross section of the building.

Beams are members that are subjected to vertical loads and are mainly bent. The beam is generally placed horizontally to support the slab and to bear various vertical loads and the weight of the beam. The beam and slab together form the building's floor and roof structure. Compared with other laterally-stressed structures (such as trusses, arches, etc.), the beam's mechanical performance is poor, but it is simple to analyze and easy to manufacture, so it is still widely used in small and medium-span buildings. Beams are mainly subjected to bending moments and shear forces under load, and sometimes torsional moments. ^[1]

Beams often appear in building structures

1. In terms of function, there are structural beams, such as foundation ground beams,

1.Beam engineering

(1) Beam volume; (2) Beam formwork; (3) Beam price exceeding 3.6m; (4) Beam side decoration

2. Calculation method of beam quantity

, the volume of the beam = the cross-sectional area of the beam * the length of the beam

The cast-in-place concrete beam is calculated by volume according to the design diagram size. Without deducting the volume occupied by the reinforcing bars and embedded iron parts in the component, the beam heads and beam pads protruding into the wall are incorporated into the beam volume.

When the beam is connected to the column, the beam length is calculated to the side of the column, and when the main beam is connected to the secondary beam, the length of the secondary beam is calculated to the side of the main beam.

When the ring beam is connected to the beam, the volume of the ring beam should be deducted from the volume of the beam protruding into the ring beam.

The concrete eaves picked out at the ring beam are calculated into the volume of the ring beam when the selected part is less than 300px; when the selected part is outside 300px, the outer skin of the ring beam is used as the boundary, and the selected part is raised ditch.

Prefabricated concrete beams are calculated by volume according to the design diagram size. The volume occupied by the steel bars and embedded iron parts in the component is not deducted.

, beam template area = (sum of beam side height + beam bottom) * beam length

Tianjin 2004 calculation rules: The concrete, reinforced concrete formwork and support are calculated according to the concrete volume of the design and construction diagram.

(3) Increase in price when the beam height exceeds 3.6m = the total volume of the wall with the beam height exceeding 3.6m

, beam side decoration = beam exposed length * decoration length

3. Difficulties in calculating beam quantities

The volume calculation of concrete beams and beams should consider the deductions when they intersect with columns, concrete walls and beams.

, beam formwork is not easy to calculate, we must consider the net length.