The cementitious composites have different properties in the changing environment. Thus, knowing their mechanical is very important for safety reasons. most case of concrete Compressive strength (CS). To predict CS Machine learning (ML) approaches has been essential. This study includes collection data from experimental work and application ML techniques to containing fly ash. chemical physical all materials used this were evaluated. Although, emphasis research on use supervised machine...

High temperature severely affects the nature of ingredients used to produce concrete, which in turn reduces strength properties concrete. It is a difficult and time-consuming task achieve desired compressive However, application supervised machine learning (ML) approaches makes it possible initially predict targeted result with high accuracy. This study presents use decision tree (DT), an artificial neural network (ANN), bagging, gradient boosting (GB) forecast concrete at temperatures on...

To avoid time-consuming, costly, and laborious experimental tests that require skilled personnel, an effort has been made to formulate the depth of wear fly-ash concrete using a comparative study machine learning techniques, namely random forest regression (RFR) gene expression programming (GEP). A widespread database comprising 216 records was constructed from available research. The includes as response parameter nine different explanatory variables, i.e., cement content, fly ash, water...

The construction details of the innovative technical solution for supporting segments a photovoltaic island located on flat roof large-area hall with steel load-bearing structure directly transverse frames this are presented. individual elements truss and beam grid constituting these discussed in detail. method effective compensation thermally generated deformations is shown as well.

Results of research on changes in microstructure selected steel grades used construction, observed cooled state after prior exposure to fire temperature are presented this paper. The following have been analyzed detail: S355J2+N, X20Cr13, X6CrNiTi18-10 and X2CrNiMoN22-5-3. These considered be representative for classic low alloy structural ferritic-pearlitic structure, several special stainless varying microstructure: martensitic, austenitic mixed, austenitic-ferritic duplex type. Analysis...

The results of experimental research on forecasting post-fire resistance to brittle failure selected steel grades used in construction are presented and discussed this paper. conclusions based detailed analysis fracture surfaces obtained instrumented Charpy tests. It has been shown that the relationships formulated these tests agree well with drawn precise appropriate F–s curves. Furthermore, other between lateral expansion LE energy Wt required break sample constitute an additional...

An original approach to forecasting the remaining safe service time of a corroded steel shell tank used store liquid fuels is presented for case where reconstruction or repair not planned. The estimated durability determined by forecast corrosion progress described based on previous trends catalogued during earlier, periodically performed checks monitored structure. analysis conducted numerically three dimensional model tank, precisely replicating real, imperfect geometry. Influence...

In the article possibility for increasing fire resistance of structural steel used in building load-bearing structures is presented and discussed detail. The recommended approach based on a suitable modification its chemical composition, particular by adding carefully selected alloying elements. With such change, not only high-temperature strength this material may be significantly increased relation to that which would achieved typical with an unmodified composition but also sufficient...

Effective failure modes relating to the steel cellular beams that nowadays have become widely used as a part of building load-bearing structure are identified and discussed in detail.They presented those being critical both due structural resistance evaluation stability assessment.In first case, ultimate bending moment whole beam presence shear is estimated well tee section located at mid-length web-opening.Regarding verification not only lateral-torsional buckling taken into consideration...

The change in the value of breaking energy is discussed here for selected steel grades used building structures after subjecting samples made them to episodes heating steady-state regime and then cooling simulated fire conditions. These changes were recorded based on instrumented Charpy impact tests, relation material initial state. S355J2+N, 1H18N9T steels also X2CrNiMoN22-5-3 duplex detailed analysis. conditions modelled experimentally by keeping a specified time at constant temperature...

Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Grzegorz Ginda, Renata Kozik, Mariusz Maślak; Application of fuzzy expert opinions to intensity evaluation direction identification cause – effect relations between factors organized by influence network. AIP Conf. Proc. 10 March 2015; 1648 (1): 600007. https://doi.org/10.1063/1.4912839 Download citation file:...

Abstract To reliably calibrate suitable partial safety factors, useful for the specification of global condition describing structural level in considered design case, usually evaluation adequate failure probability is necessary. In accidental fire situation, not only collapse load-bearing structure, but also another related to people staying a building at moment occurence should be assessed. Those values are different one from qualitative sense they coupled because determined by similar...

Results of experimental investigations concerning a quantitative assessment the influence corrosion intensity in sheets applied to side surface tanks for liquid fuels on values mechanical properties steel they have been made from, presented and analysed. Noticeable reduction yield point as well growth its brittleness observed mainly sheet zones with not uniform pitting corrosion. The reason such an occurrence is associated impairment cementite skeleton steel, accumulation micro‐damages...

Purpose The purpose of this paper is to present and discuss in detail the design approach shear buckling resistance evaluation for corrugated web being a part steel beam exposed fire. Design/methodology/approach It based on interaction between local global elastic instability failure modes as well possible yielding whole cross-section during Findings New formulae, adequate specification suitable coefficients, depend not only slenderness but also temperature structural steel....