Bearing Capacity near Support Areas of Continuous Reinforced Concrete Beams and High Grillages

Zeljko Kos,Iryna Grynyova,Yevhenii Klymenko,Irina Karpiuk

doi:10.3390/app12020685

Abstract

This work presents a proposed engineering method for calculating the bearing capacity of the supporting sections of continuous monolithic reinforced concrete tape beams, which combine pressed or driven reinforced concrete piles into a single foundation design. According to the mechanics of reinforced concrete, it is recommended to consider the grillage to be a continuous reinforced concrete beam, which, as a rule, collapses according to the punching scheme above the middle support (pile caps), with the possible formation of a plastic hinge above it. The justification for the proposed method included the results of experimental studies, comparisons of the experimental tensile shear force with the results of calculations according to the design standards of developed countries, and modeling of the stress-strain state of the continuous beam grillage in the extreme span and above the middle support-pile adverse transverse load in the form of concentrated forces. The work is important, as it reveals the physical essence of the phenomenon and significantly clarifies the physical model of the operation of inclined sections over the middle support. The authors assessed the influence of design factors in continuous research elements, and on the basis of this, the work of the investigated elements under a transverse load was simulated in the Lira-Sapr PC to clarify the stress-strain state and confirm the scheme of their destruction adopted in the physical model by the finite element method in nonlinear formulation. Based on the analysis and comparison of the experimental and simulation results, a design model was proposed for bearing capacity near the supporting sections of continuous reinforced concrete beams and high grillages that is capable of adequately determining their strength.

Highlights

Introduction published maps and institutional affilThe problem of the resistance of reinforced concrete structures to the combined actions of bending and torque moments along with transverse and longitudinal forces is one of the most important in the theory of calculating the properties of reinforced concrete
At the beginning of the twentieth century, the two main directions used in the calculation of concrete structures were formed
The Odessa State Academy of Civil Engineering and Architecture conducted systematic experimental studies [16,34,35] of the bearing capacity around the support sections of complexly loaded reinforced concrete structures, including continuous high beams. These structures symbolize the work, including monolithic reinforced concrete high grillages resting on the heads of piles, and from above, they are unfavorably loaded with concentrated forces

Summary

Introduction

The problem of the resistance of reinforced concrete structures to the combined actions of bending and torque moments along with transverse and longitudinal forces is one of the most important in the theory of calculating the properties of reinforced concrete. It has captured the attention of researchers for more than one hundred years, but it has not yet been fully resolved. Some researchers extended theoretical solutions of the theory of elasticity into plastic, which led to the creation of the theory of plasticity The basis of this trend was the rejection of the simple form of Hooke’s law and its replacement with a complex dependence. The main goal of this direction was to predict the behavior of the structure at all stages of the load, from the initial state to the ultimate state

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