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Design cross-section resistances of perforated columns under compression
Full text linkNowadays, numerous experimentally, numerically and analytically based research have been
performed to evaluate the structural responses and ultimate capacity of beams with web
openings, but mostly under bending. However, in practice, the application of steel cellular
elements dominantly loaded by axial pressure is very common. With the lack of appropriate
design approaches, we rely on engineering judgement, which can result in uneconomic, time-
consuming, or unsafe solutions. To ensure the safety of a structure it is necessary to assess its
structural resilience.
An overview of the existing experimental study on compressed I-section short columns with web
openings, assessment of the impact of openings’ size and shape on cross-section deformation
and resistance capacity under pure compression was performed. To accomplish an adequate and
easy-to-use design method for hot rolled perforated columns, the design procedures stated in: (i)
draft version of new European code prEN 1993-1-13, (ii) the Direct Strength Method (DSM) in
American standard AISI S100-16 and (iii) the Continuous Strength Method (CSM) in prEN
1993-1-4 were evaluated based on experimental data, and the obtained outcomes are briefly
presented in this paper. Although none of these design methods include all aspects of observed
case – hot rolled perforated elements under compression (Eurocode has a strict limit of axial
force, CSM and DSM primarily refer to cold-formed steel sections and do not recognize the
existence of openings at all), they turned out to be quite accurate. The corresponding results were
obtained by modifying those procedures, so they better reflect a case of interest. Thus, DSM
method didn’t need any modifications, and CSM had the most
An improved semi-analytical solution for determining water permeability of highly pervious porous materials
No full textExamination of the influence of the applied test method on the adhesion between steel reinforcement and concrete
No full textThe subject of the tests presented in this paper is the examination of the influence of the applied test method on the adhesion of concrete and reinforcement. In addition to the detailed characterization of concrete and reinforcement, adhesion tests were performed according to the stretching method and according to the modified Pull-out method, developed at the Faculty of Civil Engineering in Belgrade. The test were conducted on concrete samples, with centrally anchored bars with a diameter of 10 mm. The test results show that by eliminating the lateral pressures in the concrete, the achieved adhesion between the concrete and the reinforcement is significantly reduced
Sanacija dečijeg bazena na gradskoj plažI u Užicu
No full textThis paper describes the causes of damage to the children's pool on the city beach in Užice. During the reconstruction phase of the swimming pool, there was damage to the ceramic tile finish and a longitudinal crack in the RC slab occurred. Proposed remedial measures are presented, including injection of cracks and strengthening of the upper zone of the RC slab with carbon strips. The proposed remedial measures proved to be adequate
Demontažni smičući spojevi ostvareni zavrtnjevima i moždanicima sa glavom kod spregnutih konstrukcija od čelika i betona
No full textTo enable steel-concrete composite floor structure reusability over two or more building life
cycles, a demountable shear connection with bolts and welded headed studs is proposed. The
connection is applicable for use in composite concrete slabs with open trough profiled steel
sheeting; headed studs are installed in sheeting ribs, whereas bolts are placed between ribs. To
define connection response in terms of resistance, stiffness and ductility, identify failure modes
and propose design recommendations, comprehensive experimental work and numerical analysis
including parametric studies were performed. The research covered a range of different
parameters influencing connection response, including slab discontinuity and rib-to-beam angle.Kako bi se omogućila ponovna upotreba spregnutih međuspratnih konstrukcija od čelika i betona
tokom dva ili više životnih ciklusa jednog objekta, predložen je demontažni smičući spoj sa
zavrtnjevima i zavarenim moždanicima sa glavom. Predloženi spoj je namenjen primeni u
spregnutim pločama sa trapeznim profilisanim limom; postavljanje moždanika je predviđeno u
rebrima profilisanog lima, a zavrtnjeva između, u prevojima profilisanog lima. Kako bi
ponašanje smičućeg spoja u pogledu nosivosti, krutosti i duktilnosti bilo određeno, kako bi bili
identifikovani mehanizmi loma i date proračunske preporuke, sprovedeno je eksperimentalno i
numeričko ispitivanje uključujući parametarsku analizu. Istraživanjem je obuhvaćen niz faktora
koji utiču na ponašanje spoja, uključujući diskontinuitet ploče i ugao između rebara profilisanog
lima i ose nosača
Progressive failure analysis of cross-laminated timber using a smeared-crack-band prediction model
No full textRad prikazuje primenu modela zasnovanog na konceptu razmazane pukotine, u analizi progresivnog loma unakrsno lameliranog drveta (CLT) pri savijanju. Ponašanje drveta nakon inicijacije loma opisano je različitim bilinearnim krivama omekšavanja zbog različitog ponašanja drveta pri zatezanju (krto) i pritisku (idealno plastično). Model je implementiran u softver baziran na slojevitim konačnim elementima, zasnovanim na opštoj laminatnoj teoriji ploča. Validacija modela izvršena je poređenjem krivih sila-pomeranje i raspodela deformacija, sa eksperimentalno dobijenim rezultatima iz opsežnog programa ispitivanja. Dobijeno je odlično poklapanje rezultata, potvrđujući da se predložena metodologija može primeniti u analizi progresivnog loma masivnog drveta i drugih slojevitih pločastih konstrukcija.The paper presents an application of a smeared-crack-band-based computational model for progressive failure analysis of cross-laminated timber (CLT) panels under out-of-plane bending. The post-failure behaviour of timber parallel and perpendicular to the grain is described by distinct bilinear strain-softening curves to capture different timber response in tension (brittle behaviour) and compression (ideally-plastic behaviour). The model is implemented within a layered finite element framework based on the full-layerwise theory of laminar composites. Model validation is done through the comparison of load-displacement and strain distribution curves against the experimentally obtained results from an extensive testing program. Excellent agreement is obtained, verifying that the proposed methodology can be applied in progressive failure analysis of mass timber and other layered plate-like structures
Smičući spoj u spregnutim međuspratnim konstrukcijama od čelika i drveta
No full textConsidering the steel reusability potential and timber's environmental benefits and lightweight
nature, the steel-timber composite floors are an attractive alternative for implementation in
reusable multi-story buildings. An innovative demountable shear connector consisting of a
threaded stud installed in a steel tube and placed in the circular grout pocket of the CLT panel
has been presented in this paper. The connector shear behaviour was experimentally investigated
through push-out tests, together with the corresponding non-demountable connector consisting
of a headed stud in the circular grout pocket of the CLT panel.Uzimajući u obzir čelik kao materijal pogodan za ponovnu upotrebu, kao i prednosti drveta u
vidu male težine i povoljnog uticaja na životnu sredinu, spregnute međuspratne konstrukcije od
čelika i drveta predstavljaju atraktivnu alternativu za primenu u demontažnim višespratnim
objektima. U ovom radu predstavljeno je inovativno demontažno spojno sredstvo koje se sastoji
od moždanika sa navojem u čeličnoj cevi, smeštenog u kružni otvor unutar CLT ploče, zapunjen
malterom. Ponašanje spojnog sredstva je eksperimentalno ispitano kroz testove smicanja zajedno
sa odgovarajućim nedemontažnim rešenjem koje podrazumeva moždanik sa glavom u kružnom
otvoru u CLT ploči, zapunjenom malterom
Decoupling of infills and its benefits for the design concept of RC structures and masonry infill walls
No full textThe poor behaviour of masonry infills during previous earthquakes has prompted both researchers and practitioners to find solutions that can improve their behaviour under seismic loading. The basic demand was to prevent a devastating level of infill damage since, in many earthquakes, loss due to infill damage was the most dominant. In addition to this rudimentary request, the solution should be easy to apply in construction practice. The concept of infill isolation (decoupling) has been recognized as a potential concept that can meet these two requests. Experimental results on infill walls with a decoupling system are presented, showing clear advantages compared to traditional infills. Furthermore, the implications of applying the decoupled infills on the design concept are elaborated. The isolation of infill from the surrounding frame diminishes infill/frame interaction, solving several issues existing in the design of RC frame structures with traditional infills. This is explained in detail. Due to the fact that isolated infills behave as real non-structural elements, the design of RC frames is more reliable and replicates the real situation. Also, clear steps in the design of infills with this decoupling system are given in a straightforward manner in contrast to the rules for traditional infills. The decoupling system provides in-plane infill isolation and constant out-of-plane connection between the frame and infill at the same time. This concept enables a simple procedure for in-plane and out-of-plane verification of infills. The results presented show the big potential of the decoupling system for application in construction practice due to its simplicity in the design process and use on-site
Улога акумулација у ублажавању посљедица климатских промјена: пример слива ријеке Врбас
No full textThe consequences of climate change are becoming increasingly evident in all aspects of human activity, particularly in the field of water, affecting the availability and accessibility of water resources, and intensifying extreme phenomena such as droughts and floods. These impacts, in combination with existing vulnerabilities, can have significant consequences for society as a whole.
Consequences of climate change in the Vrbas River basin, with a special focus on flood protection, particularly in the city of Banja Luka, and the provision of water for irrigation in the downstream part of the basin, were analyzed in the article. It analyzes the role of existing and planned reservoirs in mitigating adverse events, emphasizing the importance of integrated water resources management.Посљедице климатских промјена све су очигледније у свим аспектима људског дјеловања, а
посебно су изражене у области вода, утичући на доступност и расположивост водног ресурса, посебно интензивирајући екстремне феномене као што су суше и поплаве. Ови утицаји, заједно са постојећим рањивостима, могу имати изражене посљедице на друштво у целини. У чланку су анализиране посљедице климатских промјена на сливу ријеке Врбас, са посебним освртом на заштиту од поплава, посебно града Бања Луке, и обезбијеђеност испоруке воде за наводњавање површина у најнизводнијем дијелу слива. Анализира се улога постојећих и планираних акумулација на ублажавање неповољних догађаја, наглашавајући значај интегралног управљања водним ресурсима
Analysis of ground particle velocities induced by pile driving vibrations
No full textThe effects of pile driving on soil particle velocity, the influence of pile driving depth, and how
existing retaining structures attenuate vibrations in the soil behind them were studied in the
paper. Numerical models were created using data from the geotechnical study conducted within
the project of landslide stability analysis at Višnjička 74 in Belgrade. The results show that the
ground velocities are approximately exponentially dependent on the distance from the driven
pile and that the presence of a retaining structure significantly contributes to the attenuation of
the vibrations in the soil behind it. The obtained maximum vertical velocities were further
compared with the reference values given in the SS 025211 standard for vibrations and shocks