In-Service Deformations of Reinforced Concrete Columns in Biaxial Bending
TL;DR: In this article, a method of analysis to evaluate the long-term response of reinforced concrete cross-sections subjected to sustained axial force and biaxial bending is presented.
About: This article is published in Procedia Engineering.The article was published on 2011-01-01 and is currently open access. It has received 4 citations till now. The article focuses on the topics: Reinforced solid & Beam (structure).
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01 Jun 2018
TL;DR: In this paper, a critical review of the simplified method, proposed in the standard EN 1992-1-1 Eurocode 2: Design of Concrete Structures, applied to calculating the width of cracks appearing in bent reinforced concrete sections, where non-linear concrete creep appears.
Abstract: This paper contains a critical review of the simplified method, proposed in the standard EN 1992-1-1 Eurocode 2: Design of Concrete Structures. Part 1-1. General Rules and Rules for Buildings, applied to calculating the width of cracks appearing in bent reinforced concrete sections, where non-linear concrete creep appears. The standard method has been compared with an analytical method improved by the authors with respect to non-linear creep. Using the latter approach, an effect of non-linear creep on deformations of concrete, reinforcement steel and crack widths was analysed. Two numerical examples of calculations of crack widths according to the proposed method were presented.
1 citations
TL;DR: In this paper, a modele numeryczne uwzgledniania wplywu pelzania was presented, where the modyfikacje charakterystyki materialowej betonu was used for wplyw wspolczynnika.
Abstract: Zgodnie z Eurokodem 2 nośnośc smuklych slupow zelbetowych mozna obliczac stosując uproszczone metody uwzgledniania efektow II rzedu. W obliczeniach tych slupow istotną role odgrywa pelzanie, ktorego wplyw jest najmniej rozpoznany. W pracy zaproponowano dwa modele numeryczne uwzgledniania wplywu pelzania. W pierwszym wplyw pelzania uwzgledniono przez modyfikacje charakterystyki materialowej betonu, w drugim zastosowano prawo pelzania zgodnie z teorią ageing coefficient z modyfikacją wspolczynnika pelzania. Porownano wyniki nośności obliczonej wedlug obu metod, uzyskując satysfakcjonującą zgodnośc.
TL;DR: In this article , the authors studied the effect of the stiffness of the pile foundation on the increase in bending moments in the columns and showed that taking into account the stiffness has an impact on the columns' bending moments and this cannot be ignored in the design.
Abstract: When designing reinforced slender columns for the lowest story of buildings, all factors that may affect the load-bearing capacity should be considered. One is the increase in the bending moment value caused by the rotation of the supporting foundation. The geotechnical parameters of subsoil stiffness and the method of calculating foundation displacements are the main influences. This problem applies to both shallow foundations and pile foundations. The article presents this issue in relation to pile foundations in multilayered subsoils and also the method and examples of second-order calculations that take into account the influence of pile support and columns’ nominal stiffness. The results showed that taking into account the stiffness of the pile foundation has an impact on the increase in bending moments in the columns, and this cannot be ignored in the design. The presented method allows for a precise, safe and optimal design of concrete columns supported by foundations on multilayered subsoils.
01 Jun 2017
TL;DR: In this article, the exact method of numerical calculation of second order effects of reinforced concrete columns of annular cross-section was described, and the results of the calculations obtained using this exact method were compared with the results calculated according to the nominal curvature method.
Abstract: This article describes the exact method of numerical calculation of second order effects of slender reinforced concrete columns of annular cross-section. The results of the calculations obtained using the exact method were compared with the results calculated according to the nominal curvature method. Second order effects according to the exact method are not greater than the ones calculated according to the nominal curvature method.
Cites methods from "In-Service Deformations of Reinforc..."
...Considering the equilibrium of forces, using the hypothesis of flat cross-sections as well as the creep law according to the theory of ageing coefficient (based on the analyses presented in [7] ,[8]) we obtained formulae to find stresses, strains and curvature at time t....
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References
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15 Sep 2010
TL;DR: Time-dependent deformation background Creep of concrete Shrinkage of concrete Time-Analysis - The Basic Problem Material Properties Concrete Steep Reinforcement References Design for Serviceability - Deflection and Crack Control Introduction Design Objectives and Criteria Design Actions Design Criteria for Servicability Maximum Span-to-Depth Ration Minimum Thickness Deflection Control by Simplified Calculation Crack Control References Uncracked Sections - Axial Loading Preamble The Effective Modulus Method The Principle of Superposition - Step-by-Step Method The Age-Adjusted Effect Modulus method (
Abstract: Time-Dependent Deformation Background Creep of Concrete Shrinkage of Concrete Time-Analysis - The Basic Problem Material Properties Concrete Steep Reinforcement References Design for Serviceability - Deflection and Crack Control Introduction Design Objectives and Criteria Design Actions Design Criteria for Servicability Maximum Span-to-Depth Ration Minimum Thickness Deflection Control by Simplified Calculation Crack Control References Uncracked Sections - Axial Loading Preamble The Effective Modulus Method The Principle of Superposition - Step-by-Step Method The Age-Adjusted Effect Modulus Method (AEMM) The Rate of Creep Method (RCM) Comparison of Methods of Analysis Uncracked Sections - Axial Force and Uniaxial Bending Uncracked Sections - Axial Force and Biaxial Bending Introductory Remarks Overview of Cross-Sectional Analysis Short-Term Analysis of Reinforced or Prestressed Concrete Cross Sections Long-Term Analysis of Reinforced or Prestressed Concrete Cross Sections Using the Age Adjusted Effective Modulus Long-Term Analysis of Reinforced Prestressed Concrete Cross Section Using the Step-by-Step Procedure Composite Steel-Concrete Cross Sections References Cracked Sections Introductory Remarks Short-Term Analysis Time-Dependent Analysis (AEMM) Short- and Long-Term Analysis Using the Step-by-Step Method References Members and Structures Introductory Remarks Deflection of Statically Determinate Beams Statically Indeterminate Beams and Slabs Two-Way Slab Systems Slender Reinforced Concrete Columns Temperature Effects Concluding Remarks References Stiffness Method and Finite Element Modelling Introduction Overview of the Stiffness Method Member Loads Time Analysis Using AEMM Time Analysis Using SSM Time Analysis Using the Finite Element Method Analysis of Cracked Members References Appendix: Analytical Formulations - Euler-Bernoulli Beam Model
211 citations