Jacek Wdowicki | Poznan University of Technology (original) (raw)
Papers by Jacek Wdowicki
Vibrations in Physical Systems, 2008
Structural Design of Tall and Special Buildings, Mar 8, 2010
The paper presents the analysis of shear wall structures of variable thickness using a variant of... more The paper presents the analysis of shear wall structures of variable thickness using a variant of the continuum method. In the continuous approach the horizontal connecting beams, floor slabs and vertical joints are substituted by continuous connections. The differential equation systems for shear wall structure segments of constant cross-section are uncoupled by orthogonal eigenvectors. The boundary conditions for the whole structure yield the system of linear equations for the determination of all constants of integration. The results obtained by means of this method show good agreement with those available in literature.
Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika, 2008
Inżynieria i Budownictwo, 2016
WIT Transactions on Information and Communication Technologies, Apr 15, 1997
The paper presents some experiences in a software development for civil engineering applications.... more The paper presents some experiences in a software development for civil engineering applications. It is oriented towards software quality maintenance. It relates to the computerbased analysis of three-dimensional coupled shear wall structures in multistorey buildings. The implemented method provides the calculation of internal forces, stresses and displacements due to lateral and vertical loads and to the vertical settlement, as well as it enables a dynamic analysis by means of response spectrum method. An integrated system for analysis of coupled torsional-flexural vibrations due to seismic actions and for static analysis is presented. An application area Computer programs written for civil engineering in their nature are numerical applications. They are maintained for a long time because the computations of the structural strength are based on the stable principles of mechanics and on the verified in practice methods. The design and development methodology is required in producing every system [3]. Civil engineering applications are addressed to the users who are high qualified in their professional discipline and who expect precise results of computations according to the given requirements and to the current standards. There are various reasons the users are faced with the necessity to modify this kind of software-replacements of the installation platform and user communication forms on the one hand side and technical norms changes on the other. Autors experiences indicate, that the main reason of software
Springer eBooks, Jan 16, 2007
Users' involvement in a sofhvare process is one of strategies for achieving an improvement of sof... more Users' involvement in a sofhvare process is one of strategies for achieving an improvement of software quality. The described research is refen-ed to the software system applied in civil engineering. The continual feedback from users makes possible to learn the user's point of view and to improve a product just according to her/his notes and expectations. The applied method based on a questionnaire survey has been presented-the layout of questionnaires is the original solution. Four iterations of the collaborative development, including software quality assessment, took place. The level of users' satisfaction from a product is currently better than that at the beginning.
CMM-2007 – Computer Methods in Mechanics, 2007
A method has been proposed for the analysis of thre e-dimensional shear wall and shear core assem... more A method has been proposed for the analysis of thre e-dimensional shear wall and shear core assemblies with variable dimensions and geometries. The analysis is based on a variant of t he continuum method. In the continuous approach the connecting beams and vertical joints are replaced by equivalent continuo us connections. The differential equation systems f or hear wall structure segments of constant cross-section are uncoupled by orthogon al eigenvectors. The solution matches the boundary conditions of the upper and lower part of the wall at the plane of contiguity, at which an abrupt change in cross-section occurs. Thi yields a system of linear equations for the determination of the constants of integration. The correctness and efficiency of the continuous connection method is illustrated by application of the technique to the analysis of spatial, complex wall system of variabl e cross-section.
The paper considers the free vibration analysis of coupled shear wall structures having stepwise ... more The paper considers the free vibration analysis of coupled shear wall structures having stepwise changes in the cross-section A hybrid approach, based on the analysis of an equivalent continuous medium and a discrete lumped mass system, has been used. In order to obtain the required flexibility matrix a variant of continuous connection method has been applied. The differential equation systems for shear wall structure segments of constant cross-section are uncoupled by orthogonal eigenvectors. The solution matches the boundary conditions of the upper and lower parts of the wall at the plane of contiguity, at which an abrupt change in the cross-section occurs. This yields a system of linear equations, which enables the determination of the constants of integration. The mass matrix including flexural and torsional inertia is generated. As a result of solving eigenproblem, which corresponds to free vibration equation, natural frequencies and mode shapes of vibration have been received....
The paper presents the analysis of non-planar asymmetric shear wall structures with stiffening be... more The paper presents the analysis of non-planar asymmetric shear wall structures with stiffening beams. The stiff deep beams incorporated at the various levels of coupled shear walls improve the stiffness of the structural syst em of tall building. The analysis is based on a variant of the continuous connection met hod for three-dimensional shear wall structures hav ing stepwise changes in cross-section. In the continuous approach the conne cting beams are replaced by equivalent continuous c onnections. The compatibility equations have been written at the mi dpoints of connecting and stiffening beams. The dif ferential equation systems for shear wall structure segments of the constant cross -section are uncoupled by orthogonal eigenvectors. The results of the proposed method have been compared with those obtained using the SAP2000 structural analysis program and a good match has b een observed. In the design of tall buildings it is essential tha t the structure is sufficiently stiff t...
Geotechnical, Geological and Earthquake Engineering, 2016
The paper presents an analysis of coupled flexural-torsional vibrations of multi-storey shear wal... more The paper presents an analysis of coupled flexural-torsional vibrations of multi-storey shear wall buildings using continuous-discrete approach. A dynamic model with masses in the form of rigid floor slabs has been adopted. The mass matrix is generated exactly, according to real distribution of walls, connecting beams and floor slabs. The flexibility matrix is generated on the basis of the solution of the governing differential equations for a three-dimensional continuous model. In order to verify the presented method, for the first example the free vibration analysis of non-planar, non-symmetrical coupled shear walls, previously analysed in the literature by SAP2000 program, has been chosen. In the second example, the possibility of seismic location of the multistorey building, designed originally in Poznań, stiffened by the asymmetrical system of coupled shear walls, was considered. The analysis, in which a continuousdiscrete approach and the response spectrum technique were applied, was carried out by means of DAMB (Dynamic Analysis of Multistorey Buildings) program. The presented method is efficient and can be useful at the preliminary design stage when the solutions for a structure with many various geometrical and physical arrangements are required.
Vibrations in Physical Systems, 2008
Structural Design of Tall and Special Buildings, Mar 8, 2010
The paper presents the analysis of shear wall structures of variable thickness using a variant of... more The paper presents the analysis of shear wall structures of variable thickness using a variant of the continuum method. In the continuous approach the horizontal connecting beams, floor slabs and vertical joints are substituted by continuous connections. The differential equation systems for shear wall structure segments of constant cross-section are uncoupled by orthogonal eigenvectors. The boundary conditions for the whole structure yield the system of linear equations for the determination of all constants of integration. The results obtained by means of this method show good agreement with those available in literature.
Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika, 2008
Inżynieria i Budownictwo, 2016
WIT Transactions on Information and Communication Technologies, Apr 15, 1997
The paper presents some experiences in a software development for civil engineering applications.... more The paper presents some experiences in a software development for civil engineering applications. It is oriented towards software quality maintenance. It relates to the computerbased analysis of three-dimensional coupled shear wall structures in multistorey buildings. The implemented method provides the calculation of internal forces, stresses and displacements due to lateral and vertical loads and to the vertical settlement, as well as it enables a dynamic analysis by means of response spectrum method. An integrated system for analysis of coupled torsional-flexural vibrations due to seismic actions and for static analysis is presented. An application area Computer programs written for civil engineering in their nature are numerical applications. They are maintained for a long time because the computations of the structural strength are based on the stable principles of mechanics and on the verified in practice methods. The design and development methodology is required in producing every system [3]. Civil engineering applications are addressed to the users who are high qualified in their professional discipline and who expect precise results of computations according to the given requirements and to the current standards. There are various reasons the users are faced with the necessity to modify this kind of software-replacements of the installation platform and user communication forms on the one hand side and technical norms changes on the other. Autors experiences indicate, that the main reason of software
Springer eBooks, Jan 16, 2007
Users' involvement in a sofhvare process is one of strategies for achieving an improvement of sof... more Users' involvement in a sofhvare process is one of strategies for achieving an improvement of software quality. The described research is refen-ed to the software system applied in civil engineering. The continual feedback from users makes possible to learn the user's point of view and to improve a product just according to her/his notes and expectations. The applied method based on a questionnaire survey has been presented-the layout of questionnaires is the original solution. Four iterations of the collaborative development, including software quality assessment, took place. The level of users' satisfaction from a product is currently better than that at the beginning.
CMM-2007 – Computer Methods in Mechanics, 2007
A method has been proposed for the analysis of thre e-dimensional shear wall and shear core assem... more A method has been proposed for the analysis of thre e-dimensional shear wall and shear core assemblies with variable dimensions and geometries. The analysis is based on a variant of t he continuum method. In the continuous approach the connecting beams and vertical joints are replaced by equivalent continuo us connections. The differential equation systems f or hear wall structure segments of constant cross-section are uncoupled by orthogon al eigenvectors. The solution matches the boundary conditions of the upper and lower part of the wall at the plane of contiguity, at which an abrupt change in cross-section occurs. Thi yields a system of linear equations for the determination of the constants of integration. The correctness and efficiency of the continuous connection method is illustrated by application of the technique to the analysis of spatial, complex wall system of variabl e cross-section.
The paper considers the free vibration analysis of coupled shear wall structures having stepwise ... more The paper considers the free vibration analysis of coupled shear wall structures having stepwise changes in the cross-section A hybrid approach, based on the analysis of an equivalent continuous medium and a discrete lumped mass system, has been used. In order to obtain the required flexibility matrix a variant of continuous connection method has been applied. The differential equation systems for shear wall structure segments of constant cross-section are uncoupled by orthogonal eigenvectors. The solution matches the boundary conditions of the upper and lower parts of the wall at the plane of contiguity, at which an abrupt change in the cross-section occurs. This yields a system of linear equations, which enables the determination of the constants of integration. The mass matrix including flexural and torsional inertia is generated. As a result of solving eigenproblem, which corresponds to free vibration equation, natural frequencies and mode shapes of vibration have been received....
The paper presents the analysis of non-planar asymmetric shear wall structures with stiffening be... more The paper presents the analysis of non-planar asymmetric shear wall structures with stiffening beams. The stiff deep beams incorporated at the various levels of coupled shear walls improve the stiffness of the structural syst em of tall building. The analysis is based on a variant of the continuous connection met hod for three-dimensional shear wall structures hav ing stepwise changes in cross-section. In the continuous approach the conne cting beams are replaced by equivalent continuous c onnections. The compatibility equations have been written at the mi dpoints of connecting and stiffening beams. The dif ferential equation systems for shear wall structure segments of the constant cross -section are uncoupled by orthogonal eigenvectors. The results of the proposed method have been compared with those obtained using the SAP2000 structural analysis program and a good match has b een observed. In the design of tall buildings it is essential tha t the structure is sufficiently stiff t...
Geotechnical, Geological and Earthquake Engineering, 2016
The paper presents an analysis of coupled flexural-torsional vibrations of multi-storey shear wal... more The paper presents an analysis of coupled flexural-torsional vibrations of multi-storey shear wall buildings using continuous-discrete approach. A dynamic model with masses in the form of rigid floor slabs has been adopted. The mass matrix is generated exactly, according to real distribution of walls, connecting beams and floor slabs. The flexibility matrix is generated on the basis of the solution of the governing differential equations for a three-dimensional continuous model. In order to verify the presented method, for the first example the free vibration analysis of non-planar, non-symmetrical coupled shear walls, previously analysed in the literature by SAP2000 program, has been chosen. In the second example, the possibility of seismic location of the multistorey building, designed originally in Poznań, stiffened by the asymmetrical system of coupled shear walls, was considered. The analysis, in which a continuousdiscrete approach and the response spectrum technique were applied, was carried out by means of DAMB (Dynamic Analysis of Multistorey Buildings) program. The presented method is efficient and can be useful at the preliminary design stage when the solutions for a structure with many various geometrical and physical arrangements are required.