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1
Bridge structures reconstruction in city envirnoment
100%
Bujnak J.
Zeszyty Naukowe Politechniki Świętokrzyskiej. Budownictwo
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2001
|
tom Z. 39
21-26
EN
Bridge reconstructions present some particularities. It is connected with data collection about actual technical state, load carrying capacity assessment and choice appropriate retrofitting procedures. The papers gives information on this activity and illustrates the design of reconstruction on practical case study, especialy in city areas.
2
Content available remote Headed fastenings acting in cooperation with supplementary steel reinforcement
63%
Bujnak J. , Farbak M.
Roczniki Inżynierii Budowlanej
|
2014
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tom z. 14
95--103
3
Retrofitting of Multistory Office Building After a Fire
63%
Bujnak J. , Hurajt L.
Zeszyty Naukowe Politechniki Świętokrzyskiej. Budownictwo
|
1998
|
tom Z. 36
33-38
EN
The paper describes the principles on which are based the actual concept of fire design of steel structures. By using the analysis procedure, the assessment of building damaged by fire was than performed.
4
Opotrebenie budov a ich zivotnost
63%
Hurajt L. , Bujnak J.
Zeszyty Naukowe Politechniki Świętokrzyskiej. Budownictwo
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2001
|
tom Z. 39
221-228
SK
Pri projektovani staveb a budov sa vychadza zo zasady aby najlepsie sluzili danemu ucelu. Podla Stavebneho zakona konstrukcie a konstrukcne prvky musia byt v takom stave, aby zabezpecovali stabilitu objektu, neohrozovali bezpecnost uzivatelov a slusili ich potrebam. O dlzke jestvovania objektov niet u nas vobec a v zahranici len velmi malo statistickych udajov. Pritom i tie udaje, które su dispozicii udavaju znacne sa lisiace hodnoty. To potom predurcuje skutocnost, ze stanovenie predpokladnej zivotnosti stavieb v sucasnosti je mozne len na zaklade technickeho ofhadu a s pouzitim niektórych udajov publikovanych v literature.
EN
Technical durability especially of historical buildings presents important data not only for planing of reconstruction and modemising measures. The paper provides a review of existing access to the building wearing-out progress and suggests procedure for more exact durability estimation.
5
Content available remote Optimization of sandwich plates with truss cores
51%
Nikolić R. R. , Djoković J. M. , Bujnak J.
Roczniki Inżynierii Budowlanej
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2012
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tom z. 12
5--10
EN
Sandwich plates with truss core have many advantages with respect to other structures, including the plates with the honeycomb cores. Besides the architectural possibilities, which are the consequence of their favorable appearance, these structures can carry equal or even higher loads than other similar structures. In this paper is presented an attempt to optimize the mass of the sandwich plate's structure, which is subjected to simultaneous action of loads due to the transversal shear force and the bending moment. In comparison to the corresponding sandwich plate with the honeycomb cores, the plate with the truss core is almost equally efficient form the aspect of the mass decrease.
6
Content available remote Optimal plates with prismatic cores
51%
Bujnak J. , Djoković J. M. , Nikolić R. R.
Roczniki Inżynierii Budowlanej
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2013
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tom z. 13
13--20
EN
In this paper the multifunctional sandwich plates with prismatic cores were optimized with respect to their dimensions and mass. The comparison of those plates to plates with honeycomb cores was performed. The two loading directions, longitudinal and transversal, were considered. The plates with prismatic cores have best performances when loaded longitudinally, since the plate characteristics are restricted by buckling of a plate and not of a beam. Plates with the honeycomb cores are more efficient related to weight, than the plates with the prismatic cores for smaller loads. This advantage diminishes with load increase. Based on this analysis a conclusion can be drawn that the sandwich plates with the prismatic cores are the most efficient from the aspect of the optimal mass, for structures which are simultaneously used for load carrying and cooling.
7
Content available Comparison of analytical and the FEM method for deriving the Mode I stress intensity factor of thin-walled beams containing a crack
45%
Djoković J. M. , Vulović S. D. , Nikolić R. R. , Živković M. M. , Bujnak J.
Roczniki Inżynierii Budowlanej
|
2015
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tom z. 15
43--51
EN
The problem considered in this paper is of the cracked thin-walled beams. They are subjected to combined loading by the bending moment and the axial force. The profiles with the I (H), T and U cross-sections were analyzed. The analytical method is based on application of classical expressions for Mode I SIF of such beams with taking into account the cross sections' warping. The classical expressions for SIF for the thin plate are adapted by including the reduced forces and moments characteristic for the thin-walled beams. The numerical simulation for calculating the stress intensity factor of the cracked thin-walled beams consisted of application of the Finite Element Method (FEM) by use of the J-EDI method. It is found that the Mode I SIF of cracked thin-walled beams increases with crack length increase. The conducted comparison of results obtained by application of the two methods confirms the validity of the proposed analytical expressions only for the small crack lengths.
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