Experimental and numerical analysis of early age behavior in non-reinforced concrete

Purpose The shear strength of reinforced concrete (RC) columns under cyclic lateral loading is a crucial concern, particularly, in the seismic design of RC structures. Considering the costly procedure of testing methods for measuring the real value of the shear strength factor and the existence of several parameters impacting the system behavior, numerical modeling techniques have been very much appreciated by engineers and researchers. This study aims to propose a new model for estimation of the shear strength of cyclically loaded circular RC columns through a robust computational intelligence approach, namely, linear genetic programming (LGP). Design/methodology/approach LGP is a data-driven self-adaptive algorithm recently used for classification, pattern recognition and numerical modeling of engineering problems. A reliable database consisting of 64 experimental data is collected for the development of shear strength LGP models here. The obtained models are evaluated from both engineering and accuracy perspectives by means of several indicators and supplementary studies and the optimal model is presented for further purposes. Additionally, the capability of LGP is examined to be used as an alternative approach for the numerical analysis of engineering problems. Findings A new predictive model is proposed for the estimation of the shear strength of cyclically loaded circular RC columns using the LGP approach. To demonstrate the capability of the proposed model, the analysis results are compared to those obtained by some well-known models recommended in the existing literature. The results confirm the potential of the LGP approach for numerical analysis of engineering problems in addition to the fact that the obtained LGP model outperforms existing models in estimation and predictability. Originality/value This paper mainly represents the capability of the LGP approach as a robust alternative approach among existing analytical and numerical methods for modeling and analysis of relevant engineering approximation and estimation problems. The authors are confident that the shear strength model proposed can be used for design and pre-design aims. The authors also declare that they have no conflict of interest.

Download Full-text

Improved Early-Age Cohesive Stress Response from Hybrid Blends of Micro and Macro Fibers

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1046.1 ◽

2021 ◽

Vol 1046 ◽

pp. 1-7

Author(s):

Manjunath V. Bhogone ◽

Kolluru V.L. Subramaniam

Keyword(s):

Reinforced Concrete ◽

Stress Response ◽

Volume Fraction ◽

Polypropylene Fiber ◽

Fiber Reinforced Concrete ◽

Early Age ◽

Fiber Reinforced ◽

Cohesive Stress ◽

Concrete Matrix ◽

Polypropylene Fiber Reinforced Concrete

The fracture response of macro polypropylene fiber reinforced concrete (PPFRC) and hybrid blend of macro and micro polypropylene fiber reinforced concrete (HyFRC) are evaluated at 1, 3, 7 and 28 days. There is an improvement in the early-age fracture response of HyFRC compared to PPFRC. The changing cohesive stress-crack separation relationship produced by ageing of the concrete matrix is determined from the fracture test responses. An improved early-age cohesive stress response is obtained from the hybrid blend containing micro and macro fibers. The hybrid fiber blend also has a higher tensile strength at early age when compared to an identical volume fraction of macro polypropylene fibers.

Download Full-text

Yield Design Based Numerical Analysis of Three-dimensional Reinforced Concrete

IABSE Symposium, Nantes 2018: Tomorrow’s Megastructures ◽

10.2749/nantes.2018.s3-69 ◽

2018 ◽

Author(s):

Hugues Vincent ◽

Mathieu Arquier ◽

Jeremy Bleyer ◽

Patrick de Buhan

Keyword(s):

Reinforced Concrete ◽

Numerical Analysis ◽

Three Dimensional

Download Full-text

The interaction of a reinforced concrete cylindrical tank with soil in complicated functional conditions

E3S Web of Conferences ◽

10.1051/e3sconf/20184500030 ◽

2018 ◽

Vol 45 ◽

pp. 00030

Author(s):

Barbara Kliszczewicz

Keyword(s):

Reinforced Concrete ◽

Numerical Analysis ◽

Software Package ◽

3D Model ◽

Cylindrical Tank ◽

Plastic Properties ◽

Geotechnical Parameters ◽

Structure Deformation ◽

High Deformability ◽

Properties Of Soil

The paper is dedicated to the analysis interactions between the structure of a field-based cylindrical tank made from reinforced concrete and randomly or unevenly distributed strata of subsoil. The numerical analysis with the use of the Z_Soil software package was carried out to investigate how variable geotechnical parameters demonstrated by subsoil strata with a low bearing capacity and a high deformability influence strain and stress of the tank shell and bottom. The arrangement made up of a cylindrical tank and stratified subsoil (its 3D model) was subjected to the analysis with the consideration of the elastic and plastic properties of soil (the Coulomb-Mohr model). The analysis results, presented as diagrams of the structure deformation and stresses illustrate the uneven settlement of the tank shell and its internal strain.

Download Full-text

NUMERICAL ANALYSIS OF CORRUGATED STEEL PLATE BRIDGE WITH REINFORCED CONCRETE RELIEVING SLAB

Journal of Civil Engineering and Management ◽

10.3846/13923730.2014.914092 ◽

2015 ◽

Vol 22 (5) ◽

pp. 585-596 ◽

Cited By ~ 11

Author(s):

Damian BEBEN ◽

Adam STRYCZEK

Keyword(s):

Reinforced Concrete ◽

Numerical Analysis ◽

Steel Plate ◽

Numerical Models ◽

Experimental Tests ◽

Bridge Engineering ◽

Steel Plates ◽

The Finite Element Method ◽

Calculation Results ◽

Rc Slab

The paper presents a numerical analysis of corrugated steel plate (CSP) bridge with reinforced concrete (RC) relieving slab under static loads. Calculations were made based on the finite element method using Abaqus software. Two computation models were used; in the first one, RC slab was used, and the other was without it. The effect of RC slab to deformations of CSP shell was determined. Comparing the computational results from two numerical models, it can be concluded that when the relieving slab is applied, substantial reductions in displacements, stresses, bending moments and axial thrusts are achieved. Relative reductions of displacements were in the range of 53–66%, and stresses of 73–82%. Maximum displacements and bending moments were obtained at the shell crown, and maximum stresses and axial thrusts at the quarter points. The calculation results were also compared to the values from experimental tests. The course of computed displacements and stresses is similar to those obtained from experimental tests, although the absolute values were generally higher than the measured ones. Results of numerical analyses can be useful for bridge engineering, with particular regard to bridges and culverts made from corrugated steel plates for the range of necessity of using additional relieving elements.

Download Full-text