Technical Transactions iss. 8. Civil Engineering iss. 2-B

Technical Transactions iss. 8. Civil Engineering iss. 2-B

Type: Collection of magazine numbers
Release date

Collection items (14)


Structural analysis of a failured RC beam with openings in a building under construction

Zdanowicz, Łukasz, Wojdak, Ryszard
Article
2013
Examples of defectively constructed-designed and constructed openings in RC beams in a building under construction were presented in the paper. As a result of errors in the design and construction-construction phases, the beams could not fulfil their function. The state of the considered beam with openings was defined as critical (a failure). The results of an analysis of the designed and constructed-constructed state showed differences in the static performance of the structure. However, the redistribution of internal forces is not significant because of the relatively stiff floor slab which takes over the loads from beams. This paper can also provide a background for a more general discussion about the present quality of coordination between design and construction of building structures.

Stiffness nonlinear analysis of sections for reinforced concrete members

Zdanowicz, Łukasz, Noakowski, Piotr
Article
2013
An example of nonlinear mechanics of reinforced concrete based on stiffness of the analysed elements (stiffness oriented design) is presented in the paper. To define internal forces in reinforced concrete members, usually a linear relation is used. There is lack of considering an effect of stiffness variation after the first cracking. It often leads to underestimation of crosssectional forces, which may give incorrect calculation results. The stiffness oriented nonlinear analysis allows for the description of work and behaviour of the structure much more precisely, which leads to an increase of safety and economy of the designed object.

Nonlinear analysis of pile displacement using the finite element method

Wrana, Bogumił, Kalisz, Wojciech, Wawrzonek, Mikołaj
Article
2013
The objective of this paper is a nonlinear analysis of the displacement pile using the finite element method. The results of computer simulation are compared with the in-situ test of static load. The authors made an attempt to check this process in order to verify applied computer models in terms of consistency of results. In FEM simulation there are used: actual models of constitutive relations; forming an appropriate geometry; initial and boundary conditions and area discretization of finite elements mesh. The paper is of theoretical character with the results of numerical analysis of pile displacement. Numerical calculations carried out by the authors in this study were conducted using ABAQUS package, which is used for solving problems in soil mechanics.

Design errors resulting from the adoption of an incorrect model of a structure

Sieńko, Rafał, Howiacki, Tomasz, Jedliński, Sebastian
Article
2013
The paper presents the design errors resulting from the adoption of an incorrect model of a structure as an example of real tanks. In addition, based on our own numerical analysis of a football stadium, the paper shows the differences between results obtained from the three-dimensional model – and other, more simplified schemes.

Strengthening of bent reinforced concrete beams with FRP composites – comparison of ULS design guidelines

Ryngier, Katarzyna, Derkowski, Wit
Article
2013
The paper raises an issue of designing flexural strengthening of reinforced concrete beams with FRP composite materials. Three different design approaches are presented. The conducted analysis consists of the determination of the load-bearing capacity of a beam, the assumption of loading and the evaluation of a capacity increase after strengthening the beam with a CFRP strip. Results are compared and justified and some conclusions are drawn. Furthermore, an author’s computer software for simple verification of ultimate limit state is briefly presented.

MRd– NRd interaction curves with analysis of second order effects for reinforced concrete columns

Rewers, Iga, Seruga, Teresa, Kijania, Magda
Article
2013
The paper presents regulations for evaluating MRd– NRd interaction curves for reinforced concrete members subjected to axial force and bending moments in one plane, comparing two simplified methods. An example for application of interaction curves in designing columns was presented. The latter part of the paper consists of two simplified methods of designating second order effects according to EC2 – nominal curvature method, nominal stiffness method. The comparison of them was made with MRd – NRd interaction curves.

Support for making design decisions in renovation of historic building

Pukowiec, Anna, Sobotka, Anna
Article
2013
The design and implementation of building structure renovation works allow for a selection of constructional and material solutions, as well as organisational issues. Proper selection should take into account many different technical and economic factors, and in the case of historic buildings – conservation factors as well. This leads to suggesting various solutions. Choosing a solution should not be intuitive, but based on a multi-criteria analysis using simple or complex decision-making models. This paper discusses two constructional solutions for a flat roof in a historic building subject to renovation. An AHP method-based multi-criteria analysis has been carried out for both of them. This analysis allows for the assessment and selection of a proper solution.

Dynamic analysis of the pedestrian and cyclist footbridge between Kazimierz and Ludwinow quarter in Krakow

Murzyn, Izabela J., Pańtak, Marek
Article
2013
The paper is dedicated to issues relating to the dynamics of footbridges. It includes the basic information about the dynamic characteristics of pedestrian bridges – the frequencies and modes of vibrations, stiffness, and damping. An essential part of this work is the dynamic analysis of the Kazimierz–Ludwinow footbridge in Krakow with a span of 127.20 m. The analysis was completed on the basis of a numerical model in the Autodesk Algor Simulation 2011 (Student Version) package.

The pile stiffness in a piled-raft foundation

Kutera, Beata, Kacprzak, Grzegorz
Article
2013
The paper presents the trial of the theory of elasticity application to estimate pile stiffness in a combined piled-raft foundation. Two methods were applied: a simplified numerical model and closed-form analytical solution. Results were compared with the field tests.

Effect of some factors on second order effects in reinforced concrete columns

Kijania, Magda, Seruga, Teresa, Rewers, Iga
Article
2013
This paper presents the results of an analysis of reinforced concrete columns in which there are differences in the value of the second order effects obtained from the method of nominal stiffness (MNS) and the method of nominal curvature (MNC) based on Eurocode 2. Some of the factors such as cracking, ratio of reinforcement, cross-section of a column, and relation of an axial force NEd to a design axial resistance of section NRd, were analysed. It was shown that the choice of the method for calculating the second order effect is crucial and can impact the design of columns significantly.