A method for determining the bearing capacity of asymmetrically constrained statically indeterminate reinforced concrete beams

By considering the bending moment of the fixed section and the shear force at the loading point in the compression-strut-tension model, the internal force equilibrium equation is re-established and the ultimate bearing capacity of the reinforced concrete beam is calculated. This solves the internal force equilibrium problem of the existing model in asymmetric constrained statically indeterminate reinforced concrete beams and improves the reliability of the calculation results.

CN118862236BActive Publication Date: 2025-09-19CHINA UNIV OF MINING & TECH
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Patent Information

Application Number
CN202410883147.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-07-03
Publication Date
2025-09-19
Estimated Expiration
2044-07-03

AI Technical Summary

Technical Problem

The existing strut-tension model cannot meet the internal force equilibrium conditions of the component when dealing with asymmetrically constrained statically indeterminate reinforced concrete beams, which affects the reliability of the calculation results.

Method used

By establishing an internal force equilibrium equation that takes into account the bending moment of the fixed section and the shear force at the loading point, the relationship between the unilateral concentrated load borne by the reinforced concrete beam and the load borne by each component is re-determined, the plastic ultimate bearing capacity of each component is calculated, and the minimum value is taken as the ultimate bearing capacity of the beam.

Benefits of technology

This method can be applied to more complex working conditions, improves the reliability of the calculation results, and clarifies the failure mode of the component by judging the failure mode.

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Abstract

The present invention discloses a method for determining the bearing capacity of an asymmetric constrained indeterminate reinforced concrete beam. The method comprises the following steps: calculating the bending moment of the fixed section and reducing it, taking the moment at the hinged end support to establish an equilibrium equation; (4) based on the bending moment of the fixed section and the shear force at the fixed end loading point, establishing an internal force equilibrium equation for the fixed end compression rod-tension rod model, and obtaining the relationship between the unilateral concentrated load P borne by the reinforced concrete beam and the load borne by each component; (5) based on the shear force at the hinged end loading point, establishing an internal force equilibrium equation for the hinged end compression rod-tension rod model, and obtaining the relationship between the unilateral concentrated load P borne by the reinforced concrete beam and the load borne by each component; (6) calculating the plastic ultimate bearing capacity of each component and using it as the load borne by each component, calculating multiple P values, and taking the minimum P value as the ultimate bearing capacity of the reinforced concrete beam. The present invention determines the failure mode of the component by determining the location of the damaged component.
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