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1.
Sustainable design of circular reinforced concrete column sections via multi-objective optimization
Primož Jelušič, Tomaž Žula, 2023, original scientific article

Abstract: An optimization model for reinforced concrete circular columns based on the Eurocodes is presented. With the developed optimization model, which takes into account the exact distribution of the steel reinforcement, which is not the case when designing with conventional column design charts, an optimal design for the reinforced concrete cross section is determined. The optimization model uses discrete variables, which makes the results more suitable for actual construction practice and fully exploits the structural capacity of the structure. A parametric study of the applied axial load and bending moment was performed for material cost and CO2 emissions. The results based on a single objective function show that the optimal design of the reinforced concrete column cross section obtained for the material cost objective function contains a larger cross-sectional area of concrete and a smaller area of steel compared with the optimization results when CO2 emissions are determined as the objective function. However, the optimal solution in the case where the material cost was assigned as the objective function has much more reserve in axial load capacity than in the optimal design where CO2 was chosen as the objective function. In addition, the multi-objective optimization was performed to find a set of solutions that provide the best trade-offs between the material cost and CO2 emission objectives.
Keywords: reinforced concrete columns, circular cross section, costs, CO2 emissions, multi-objective optimization, genetic algorithm
Published in DKUM: 15.04.2024; Views: 17; Downloads: 1
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2.
Statična in dinamična analiza jeklenega visečega mostu v Renkah : magistrsko delo
Nik Poglajen, 2024, master's thesis

Abstract: Magistrska naloga obravnava statično in dinamično analizo mostu Renke, ki je bil zgrajen leta 1991 z namenom omogočanja prehoda ljudi iz naselja do železniške postaje na nasprotni strani reke Save. Danes so na mostu vidne poškodbe, vključno s preperelimi deskami, odpadanjem barve in rjavečimi jeklenimi elementi, ki so posledica pomanjkanja rednega vzdrževanja. Analiza mostu je narejena s pomočjo programa SCIA Engineer, z uporabo linearne in nelinearne teorije. Pri analizi so upoštevani standardi iz družine Evrokod 1, 2, 3, 7 in 8. Preverjeni so tako jeklena konstrukcija mostu kot tudi betonski temelji. Most je opisan kot viseči most, pri čemer se glavna jeklenica naslanja na dva pilona, ki sta postavljena na obeh straneh mostu in sta zasnovana v obliki črke A. Glavna jeklenica je sidrana v zaledje s težnostnim zidom in geotehničnimi sidri. Širina mostu znaša 1,62 m, glavni razpon meri 72 m, stranska razpona pa 15 m in 10 m. Na glavno jeklenico so simetrično pritrjene vešalke, ki zagotavljajo oporo glavnemu L-nosilcu in horizontalnemu povezju s hrastovimi deskami. Glavni cilj magistrske naloge je primerjava rezultatov analize mostu Renke med standardom JUS in sodobnim evropskim standardom Evrokod. Analiza kaže, da Evrokod v nekaterih primerih prinaša bistveno drugačne rezultate od standarda JUS, deloma tudi zaradi uporabe različnih materialnih parametrov. Ta primerjava omogoča boljše razumevanje vpliva standardov na varnost in zmogljivost mostu ter poudarja pomen uporabe aktualnih standardov pri načrtovanju in vzdrževanju infrastrukture.
Keywords: viseči most, jeklo, primerjava standardov JUS in EC, statična analiza, dinamična analiza
Published in DKUM: 16.02.2024; Views: 228; Downloads: 48
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3.
Analiza posedkov in napetosti geotermalnih pilotov : magistrsko delo
Mitja Madjar, 2023, master's thesis

Abstract: V magistrski nalogi obravnavamo določitev posedkov geotermalnih pilotov in osnih napetosti zaradi mehanske in termalne obremenitve. V teoretičnem delu smo opisali geotermalno energijo, vrste geotermalnih konstrukcij in navedli nekaj primerov iz prakse. V računskem delu pa smo izračunali vertikalno nosilnost pilota z metodo, ki jo je podal Berezantzev. Posedek zaradi mehanske obremenitve pa smo izračunali po metodi, ki jo je razvil Poulos. Izračunali smo tudi posedek pilota zaradi temperaturne obremenitve in analizirali vpliv spremembe temperature v različnih zemljinah in glede na dolžino pilota. Analiza kaže na to, da je vpliv spremembe temperature na geotermalni pilot manjši v primerjavi z mehansko obremenitvijo na pilot, vendar ga ne smemo zanemariti, predvsem v drobnozrnatih zemljinah.
Keywords: geotermalna energija, geotermalne konstrukcije, geotermalni piloti, posedki
Published in DKUM: 20.09.2023; Views: 296; Downloads: 33
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4.
Potential of using waste materials in flexible pavement structures identified by optimization design approach
Primož Jelušič, Süleyman Gücek, Bojan Žlender, Cahit Gürer, Rok Varga, Tamara Bračko, Murat V. Taciroğlu, Burak E. Korkmaz, Şule Yarcı, Borut Macuh, 2023, original scientific article

Abstract: This paper presents the design of geosynthetic reinforced flexible pavements and their modification by incorporating waste materials into bonded and unbonded layers of the pavement structure. The optimal design of flexible pavements was achieved by minimizing the construction cost of the pavement. The incorporation of waste materials into the pavement structure affects the material properties. Therefore, along with the traffic load, the effects of the material properties of the asphalt concrete, base layer, sub-base layer, and subgrade were analyzed in terms of pavement structure costs and CO2 emissions of materials used in pavement construction. In addition, a comparison was made between pavements with and without geosynthetic reinforcement in terms of design, optimum construction cost, and CO2 emissions. The use of geosynthetics is even more effective in pavement structures that contain waste materials in an unbound layer, both in terms of cost and CO2 emissions. The minimum value of the California Bearing Ratio of the subgrade was determined at which the use of geosynthetic reinforcement for pavement structure with and without the inclusion of waste materials is economically and sustainably justified. The use of geosynthetics could result in a 15% reduction in pavement structure cost and a 9% reduction in CO2 emissions due to the reduced thickness of unbound layers. In addition, reducing the CBR of the unbound layer from 100% to 30% due to the inclusion of waste materials implies a cost increase of up to 13%. While the present study is based on an empirical pavement design method in which pavement thickness is limited by the pavement thickness index, the same minimum thicknesses are obtained in the optimization process regardless of whether the objective function is the minimum construction cost or minimum CO2 emissions.
Keywords: pavement design, waste materials, optimization, minimum construction cost, CO2 emissions, geosynthetics, waste management
Published in DKUM: 18.09.2023; Views: 484; Downloads: 30
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5.
Implementation of climate change effects on slope stability analysis
Tamara Bračko, Bojan Žlender, Primož Jelušič, 2022, original scientific article

Abstract: The objective of this study is to determine the impacts of expected climate change on slope stability. For this purpose, the case study of a slope instability, that was triggered in 2021 was selected. The stability analysis was performed considering the theory of rainfall infiltration and using Geo-Studio’s SEEP/W module for the surface infiltration model of the slope. A parametric stability analysis of the slope was conducted to determine the importance of climate change on slope stability. Conditions for changes in volumetric water content, water permeability, porewater pressure, and groundwater flow are important. When soil permeability is low, the factor of safety decreases during rainfall events and on the days following, while when permeability is higher, safety increases after rainfall events. The effect of lower cohesion is nearly linear, with the factor of safety decreasing by 0.1 for every 1 kPa less cohesion. The increase in net infiltration of water may be the most critical factor for slope instability. The results of the analysis indicate that timely reduction of water net infiltration through planting and proper surface water runoff from the upper road and slope would be a relatively simple and inexpensive measure compared to the cost of remediating the landslide, considering expected climate change. Therefore, it is advisable to analyze all slopes with respect to the expected climate change, taking into account the potential impacts of climate change.
Keywords: climate change adaptation, slope stability, rainfall infiltration, water net infiltration, seepage analyses
Published in DKUM: 18.08.2023; Views: 352; Downloads: 29
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6.
Globalna analiza 75 metrov visoke jeklene stolpnice z garažo : magistrsko delo
Aljaž Levstik, 2023, master's thesis

Abstract: Magistrsko delo obravnava globalno analizo 75 metrov visoke jeklene stolpnice z garažo. Gre za 21-etažno konstrukcijo, tlorisnih dimenzij 30 m x 30 m, z dvonadstropno armiranobetonsko garažo, visoko 7 metrov in locirano v Mariboru. Na podlagi lokacije, namembnosti in sestave konstrukcije so bile določene obtežbe oziroma vplivi nanjo. Po izvedeni statični in potresni analizi so dimenzionirani ključni konstrukcijski elementi – nosilci, stebri, plošče, spoji. Analize so bile izvedene s programskim orodjem Scia Engineer, spoji pa s programskim orodjem Idea Statica. Pri projektiranju in dimenzioniranju smo upoštevali evropske standarde Evrokod SIST EN 1990, SIST EN 1991, SIST EN 1992, SIST EN 1993, SIST EN 1997 in SIST EN 1998 s pripadajočimi nacionalnimi dodatki.
Keywords: gradbeništvo, statična analiza, dinamična analiza, stolpnica, jeklena konstrukcija
Published in DKUM: 06.06.2023; Views: 317; Downloads: 92
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7.
Nosilnost plitvih temeljev na armirani zemljini : diplomsko delo
Jure Kljajič, 2023, undergraduate thesis

Abstract: Diplomsko delo analizira uporabo geosintetikov pri izboljšavi in armiranju tal. V nadaljevanju na kratko opišemo temeljenje in splošne informacije o geosintetikih. Za tem sledi opis postopka in primer izračuna nosilnosti tal pod temeljem brez armiranja zemljine, z izboljšavo zemljine in z armiranjem zemljine. Na koncu sledi primerjava rezultatov in presoja, pri katerih pogojih so izboljšave in armiranje zemljine smiselne.
Keywords: plitvi temelji, armirana zemljina, geosintetiki, nosilnost
Published in DKUM: 20.01.2023; Views: 510; Downloads: 80
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8.
Teorija uvrtanih pilotov s cevitvijo ter preveritev nosilnosti posameznih pilotov na lokaciji Javornik - nakupovalni center : diplomsko delo
Rok Lačen, 2023, undergraduate thesis

Abstract: Piloti so linijski elementi, ki imajo funkcijo prenosa obremenitve iz konstrukcije na globljo plast tal, ki ima ustrezne lastnosti. Zakonitosti mehanike tal omogočajo predvidevanje odziva pilotov na obremenitev. Na ta odziv močno vpliva način vgradnje pilotov, zato je treba upoštevati interakcijo pilota in temeljnih tal. V diplomskem delu smo prikazali postopek preveritve nosilnosti uvrtanih pilotov s cevitvijo. Za analizo nosilnosti pilotov se je izbralo območje pri Javorniku v občini Ravne na Koroškem, kjer se je na pilotih zgradil trgovski center. Za izračun nosilnosti smo uporabili metodo, ki jo razvil Berezantsev (metoda 1), ter metodo, ki sta jo podala Décourt and Quaresma (metoda 2). Ugotovili smo, da se metodi med seboj očitno razlikujeta, kar se odraža tudi na nosilnosti pilotov. Pri metodi 1 izračunamo nosilnost pilotov na podlagi strižnih parametrov zemljine, ki so pridobljeni na podlagi terenskih preiskav. Pri metodi 2 se izračunamo nosilnost pilota neposredno na podlagi terenske preiskave, tj. rezultatov standardnih penetracijskih preizkusov (SPT). Glede na izračune nosilnosti pilotov, podane v geološkem – geotehničnem poročilu izvedenega projekta, lahko ugotovimo, da se ujemajo z rezultati, pridobljenimi z metodo 1.
Keywords: gradbeništvo, temeljenje, piloti, nosilnost, izračun.
Published in DKUM: 19.01.2023; Views: 701; Downloads: 96
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9.
Analitična in numerična analiza časovnega razvoja posedka : diplomsko delo
Klara Šoster, 2022, undergraduate thesis

Abstract: Diplomska naloga prikazuje izračun posedka pod enakomerno brezkrajno pasovno obtežbo, končni čas posedanja ter časovni razvoj posedka. Izračun posedka je bil izračunan z analitično metodo, ki temelji na srednjem modulu stisljivosti. Numerična analiza posedka pa je bila izvedena z računalniškim programom Plaxis, ki temelji na metodi končnih elementov. V uvodnem delu so opisane nekatere osnovne zakonitosti mehanike tal in modeli za simulacijo odziva zemljine na spremembo napetosti. V nadaljevanju je prikazan analitični izračun časovnega razvoja posedka z obrazložitvijo uporabljenih metod in enačb. Prikazani pa so tudi koraki modeliranja v programu Plaxis, ki so potrebni za numerično analizo časovnega razvoja posedka. Izvedena je primerjava rezultatov analitične in numerične metode na podlagi velikosti posedka in končnega časa posedanja. Rezultati analitične in numerične analize izkazujejo veliko stopnjo ujemanja, saj so bili izračuni izvedeni na podlagi enakih materialnih lastnosti. Numerična analiza pa vendarle podaja natančnejšo oceno posedka in končni čas posedanja, saj je pri numerični analizi zemeljski pol-prostor razdeljen na manjše elemente kot pri analitični metodi izračuna posedka. Računalniški program prav tako omogoča natančno določitev začetnih efektivnih napetosti in spremembo napetosti, ki so posledica obremenitve ali konsolidacije.
Keywords: posedek, konsolidacija, numerična analiza
Published in DKUM: 22.08.2022; Views: 545; Downloads: 44
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10.
Jekleni most s poševnimi kabli dolžine 100 m : magistrsko delo
Klementina Knez, 2022, master's thesis

Abstract: V sklopu magistrskega dela je prikazana zasnova jeklenega mostu s poševnimi kabli dolžine 100 m in glavnega razpona 60 m. Premostitvena konstrukcija je namenjena mešanemu prometu. Na sredini se nahajata 2 pasova, namenjena motornemu prometu, ter na vsaki strani pas za kolesarje in pešce. Izvedena je statična in dinamična analiza za obtežne kombinacije ter nato dimenzioniranje po mejnem stanju nosilnosti in mejnem stanju uporabnosti v skladu z Evrokod standardi. V sklopu dimenzioniranja je izvedena tudi zasnova ter analiza podpornih konstrukcij, kjer je za krajni opornik izbran podporni zid, za temelj pilona pa so uporabljeni piloti.
Keywords: gradbeništvo, most s poševnimi kabli, jeklene konstrukcije, piloti
Published in DKUM: 20.05.2022; Views: 735; Downloads: 107
.pdf Full text (10,44 MB)

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