Reinforcement method of concrete deep beam

Abstract

The invention discloses a reinforcement method of a concrete deep beam, and aims at improving the reinforcement correctness of the concrete deep beam. The reinforcement method comprises the following steps: S101, determining a disordered area and a non-disordered area of the concrete deep beam according to a saint venant principle; S102, constructing an equivalent strut-and-tie model for the disordered area of the concrete deep beam; S103, determining the internal forces of a strut bar and tie bar in the strut-and-tie model; S104, reinforcing the disordered area of the concrete deep beam according to the internal force of the tie bar and stress limiting value of a reinforcing steel bar; S105, determining the stresses of the strut bar in the reinforced strut-and-tie model and a knot; S106, judging the stresses of the strut bar and the knot are in a corresponding set range, if both the stresses of the strut bar and the knot are in the corresponding set range, executing the step S107, and if the stresses of the strut bar and / or the knot are not in the corresponding set range, executing the step S102; and S107, finishing the reinforcement.

Description

technical field [0001] The invention relates to the technical field of construction engineering, in particular to a reinforcement method for deep concrete beams. Background technique [0002] "Code for Design of Concrete Structures" (GB50010-2002) stipulates that simply supported beams with a ratio of span to height l / h≤2 and continuous beams with l / h≤2.5 are deep beams. Due to the large size of the deep beam structure and the complex force of the internal system, there are many types of failure of the deep beam. There are three main failure forms of deep beams: one is bending failure; the other is shear failure; the third is local compression or anchorage failure. In order to resist various damages, the reinforcement of deep beams is more complicated. [0003] At present, the code recommends to adopt the section internal force method for design. In the design of concrete deep beams, the designed deep beam structure is generally divided into B area (non-disturbed area) 01 ...

AI Technical Summary

Problems solved by technology

In order to resist various damages, the reinforcement of deep beams is more complicated

[0003] At present, the code recommends to adopt the section internal force method for design. In the design of concrete deep beams, the designed deep beam structure is generally divided into B area (non-disturbed area) 01 and D area (disordered area) 02 according to Saint-Venant's theorem, such as Figure 1a and Figure 1b shown, where Figure 1a and Figure 1b It is the schematic diagram of the structure after the deep beam structure is divided into B area and D area. For the area outside the range of the beam height in the longitudinal direction of the loading position (B area, also known as the non-turbulent area) conforming to the assumption of the plane section, the internal force of the section can be used For the area that does not conform to the assumption of the plane section within the range of beam height (D area, also known as the disordered area), the force is complicated.

[0004] If the cross-sectional internal force method is used for force analysis and reinforcement of D area, the calculation accuracy is poor

The commonly used reinforcement calculations for the D area of ​​deep beam structures are obtained from experimental analysis and referring to past experience. The disadvantages of this method are: first, the error may be large, and most of them are conservative; second, the concept of mechanics is unclear, difficult to understand

Images