Shearing-resistant reinforced concrete beam and method thereof

Abstract

The invention discloses a shear-resistant reinforced concrete beam and a method thereof. The shear-resistant reinforced concrete beam comprises a concrete body; the steel reinforcement framework is arranged in the concrete body and comprises longitudinal bars and a plurality of stirrups wrapping and restraining the longitudinal bars, and the longitudinal bars are arranged in the length direction of the concrete body and symmetrically arranged in parallel about the beam axis; wherein a plurality of preset holes are formed in a concrete body between the beam axis and the concrete beam bottom, the preset holes are symmetrically formed relative to the central cross section, and the intersection points of the central axes of the preset holes on the same side of the central cross section and the central longitudinal section are located on the same straight line; and the straight line passes through a concentrated force loading point on the same side of the central cross section. The shear bearing capacity and the deformation capacity of the RC beam are greatly improved and stabilized at a high level.

Description

technical field [0001] The invention relates to the technical field of building structures, in particular to a shear-resistant reinforced concrete beam and a method thereof. Background technique [0002] Reinforced concrete structures are the most widely used structural form today. It is mainly composed of beams, columns, slabs, walls, foundations and other main load-bearing components. Reinforced concrete beams (reinforced concrete beams, RC beams for short) are the core load-bearing members of structures such as buildings and bridges, and mainly bear loads such as bending moments and shear forces. Its main feature is that in the section that mainly bears the bending moment, the longitudinal tension reinforcement is arranged along the lower part of the beam to bear the tension caused by the bending moment of the beam cross section. In the section where the bending moment and the shear force act together, the transverse stirrups and oblique steel bars are arranged, and the...

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Problems solved by technology

[0003] At present, the existing RC beams have the following problems in terms of shear performance: although structural measures are adopted to prevent cable-tension damage, the shear capacity of RC beams varies greatly for shear-compression damage; when the shear-span ratio When the commonly used range is between 2.0 and 4.0, the upper limit of the test results of the shear capacity of nearly 50% of the RC beams can reach 2 to 3 times the lower limit

[0004] The above problems lead to: first, the shear bearing capacity of RC beams is difficult to estimate, and only the lower envelope of the test results can be used in the design, that is, the lower limit

As a result, in most cases, the shear bearing capacity design of RC beams tends to be conservative, which wastes a lot of building materials, which is not conducive to the green development of carbon reduction and environmental protection

Second, the large variation range of the shear capacity of RC beams makes the seismic design very difficult, and it is difficult to accurately estimate the seismic performance safety reserve of RC beams, which may not be able to meet the seismic demand when a major earthquake occurs

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