Buckling analysis on a microcomputer of reinforced concrete beams subjected to axial loads and biaxial bending

The experimental tests data of reinforced concrete beams of a rectangular profile made of heavy concrete on pure biaxial bending are presented. The inclination angle of the external load plane to the vertical axis of inertia of the section varied in the range from 0º to 20º. The tests were conducted to study the work of the biaxial bended elements under load and to verify the developed method for strength analysis of such elements. It has been established that the order of changing the neutral axis position in the section of the biaxial bending beams in the loading process depends primarily on the relative disposition of the external load plane and the resultant in the tensioned reinforcement. It has been confirmed that the ultimate compressed fibrous strains of concrete depend not on the shape of the section, but on the shape of the concrete compressed zone. The results of the tests have good correspondence with theoretical calculations, which proves the expediency of using the developed engineering method for the strength analysis.

Download Full-text

Shear Capacity of Reinforced Concrete Beams under Biaxial Bending Based on Equivalent Cross-Section Method

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.400-402.275 ◽

2008 ◽

Vol 400-402 ◽

pp. 275-280

Author(s):

Qing Xiang Zeng ◽

Jian Cai

Keyword(s):

Reinforced Concrete ◽

Cross Section ◽

Concrete Beams ◽

Shear Capacity ◽

Reinforced Concrete Beams ◽

Biaxial Bending ◽

Section Method ◽

Flexural Member ◽

Flexural Beam ◽

Cross Section Method

Based on the analysis of reinforced concrete beams under biaxial bending, an equivalent cross-section method is proposed to calculate the shear capacity of the beams. According to the two basic equivalence principles, a biaxial flexural beam is changed into a uniaxial flexural member, and the shear strength of biaxial flexural beam is calculated as a uniaxial flexural member. Furthermore, the interrelationships among the equivalent cross-section and the neutral axis inclination as well as the ratio of depth to width of the cross-section are deduced in advance. The ratios of some typical cross-section’s equivalent dimensions to its original ones are pointed also. In order to verify the availability of the equivalent cross-section method, some academic references about the ultimate strength of biaxial flexural beams are consulted in this paper, and the shear capacity computing methods by literatures for uniaxial flexural beams are adopted in the strength calculation of biaxial flexural reinforced concrete simply supported beams with stirrups or without stirrups. The comparison between the calculation results and experimental results shows that the presented equivalent cross-section method is feasible and practical which can be used as a reference in practice design.

Download Full-text

Shear Capacity of Reinforced Concrete Beams with Square Cross Section Subjected to Biaxial Bending

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/713/1/012029 ◽

2020 ◽

Vol 713 ◽

pp. 012029

Author(s):

R Thamrin ◽

S Haris ◽

E Dedi ◽

E Dalmantias

Keyword(s):

Reinforced Concrete ◽

Cross Section ◽

Concrete Beams ◽

Shear Capacity ◽

Reinforced Concrete Beams ◽

Biaxial Bending

Download Full-text

Torsional strength of reinforced concrete beams

Canadian Journal of Civil Engineering ◽

10.1139/l99-083 ◽

2000 ◽

Vol 27 (3) ◽

pp. 445-453 ◽

Cited By ~ 18

Author(s):

Khaldoun N Rahal

Keyword(s):

Reinforced Concrete ◽

Concrete Beams ◽

Pure Shear ◽

Concrete Strength ◽

Reinforced Concrete Beams ◽

Axial Loads ◽

Simple Method ◽

Torsional Strength ◽

Mode Of Failure ◽

Good Agreement

A simple method for predicting the ultimate strength and mode of failure of reinforced concrete beams subjected to pure torsion is presented. This method is an extension of a recently developed method for predicting the strength of membrane elements subjected to pure shear that was also applied to beams subjected to combined shearing forces, bending moments, and axial loads. The torsional strength is related to the amounts of transverse and longitudinal reinforcement and to the concrete strength. To check the adequacy of this simple method, the calculated strength and mode of failure are checked against the experimental results of 66 beam tests available in the literature, and good agreement is found. The simplicity of the method is illustrated by an example.Key words: beams, building codes, mode of failure, reinforced concrete, shear, strength, torsion.

Download Full-text