Accurate finite element modeling of pretensioned prestressed concrete beams

Kim²,

Structure and Infrastructure Engineering

et al. 2016

a department of civil and environmental engineering, college of engineering, Yonsei university, Seoul, republic of Korea; b Infrastructure research team, gS e&c, Seoul, republic of Korea ABSTRACT A half-deck bulb tee (HBT) girder, which is an unusual concept for pre-stressed concrete girders, was developed and tested for a long span application. The purpose of the test was to simplify the construction process and increase structural performance by optimising the cross sections and improving the efficiency of the tendon profile. In this study, a full-scale HBT girder, with a length of 60 m and depth of 2.3 m, which includes the .1 m depth of the half-deck, was fabricated and tested to analyse its structural performance. The data observed from the flexural loading tests were evaluated by comparing with the results of finite element analysis (FEA). The tested HBT girder specimen was expected to be sufficiently safe for actual bridge design because it satisfied construction code requirements. The initial cracking load observed during the experiment (1400 kN) was accurately predicted by FEA (1420 kN) and theory (1301 kN). Therefore, the developed HBT girder has sufficient and predictable flexural strength.

Section: Static Loading Test Descriptionmentioning

confidence: 99%

Flexural behaviour of a half-decked bulb tee pre-stressed concrete girder: full-scale test and nonlinear finite element analysis

Kim²,

Structure and Infrastructure Engineering

et al. 2016

“…For example, Dudziak [ 1 ] presented the non-linear analysis of reinforced concrete structures for engineering applications and proposed a new constitutive hypoelastic–brittle model of concrete. Yapar et al [ 2 ] carried out numerical simulations of the behavior of prefabricated pre-tensioned concrete beams in specific phases of operation, also after exceeding limit states (which resulted in damage). The calculation took into account the non-linear, degradation, elastic–plastic concrete model and the slip between bars and concrete.…”

Section: Introductionmentioning

confidence: 99%

Matrix Description of Non-Linear Properties of Materials or Structural Components—Idea and Application Examples

Janiak¹

2021

Materials

Numerical methods are widely used in structural analysis problems. In the cases of the most complex and practical problems, they are often the only way to obtain solutions, as analytical methods prove ineffective. The motivation for this paper was the desire to extend the scope of numerical methods to cover the problems of creating constitutive models of structural materials. The aim of this research was to develop a matrix or numerical discrete constitutive model of materials. It presents the general assumptions of the developed method for modeling the physical properties of materials. The matrix model is only useful with an appropriate numerical algorithm. Such an algorithm was created and described in this paper. Based on its findings, computer software was developed to perform numerical simulations. Presented calculation examples confirmed the effectiveness of the developed method to create constitutive matrix models of various typical materials, such as steel, but also, e.g., hyper-elastic materials. It also presents the usefulness of constitutive matrix models for simulations of simple stress states and analyses of structural elements such as reinforced concrete. All presented examples involved the physical nonlinearity of the materials. It is proved that the developed matrix constitutive model of materials is efficient and quite versatile. In complex analyses of structures made of nonlinear materials, it can be used as an effective alternative to classical constitutive or analytical models based on elementary mathematical functions.

International Journal of Applied Mechanics and Engineering

“…An analysis of prestressed concrete members can be performed based on either cross-sectional concept methods or by discrete methods. The finite element method, which is considered one of the powerful discrete methods, has been used to accurately predict the behavior of ordinary and prestressed concrete members [3,4,5]. A simpler approach can be adopted by studying the member cross-sections rather than the full member.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Structural Concrete Bar Members Based on Secant Stiffness Methods

Al-Rumaithi

Fadhil

Salman

2020

In this paper, the behavior of structural concrete linear bar members was studied using numerical model implemented in a computer program written in MATLAB. The numerical model is based on the modified version of the procedure developed by Oukaili. The model is based on real stress-strain diagrams of concrete and steel and their secant modulus of elasticity at different loading stages. The behavior presented by normal force-axial strain and bending moment-curvature relationships is studied by calculating the secant sectional stiffness of the member. Based on secant methods, this methodology can be easily implemented using an iterative procedure to solve non-linear equations. A comparison between numerical and experimental data, illustrated through the strain profiles, stress distribution, normal force-axial strain, and moment-curvature relationships, shows that the numerical model has good numerical accuracy and is capable of predicting the behavior of structural concrete members with different partially prestressing ratios at serviceability and ultimate loading stages.