Kompozitinių plienbetoninių plokščių, armuotų plieniniu plaušu, savybių tyrimas

Petkevičius, Mindaugas

doi:10.3846/mla.2009.5.10

Science - Future of Lithuania

2011

DOI: 10.3846/mla.2009.5.10

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Kompozitinių plienbetoninių plokščių, armuotų plieniniu plaušu, savybių tyrimas

Mindaugas Petkevičius

Abstract: Nagrinėjama plieninio plaušo įtaka kompozitinių plienbetoninių plokščių stiprumui ir standumui veikiant statinei trumpalaikei apkrovai. Bandiniams panaudoti „kregždės uodegos“ tipo plieniniai lakštai ir plieniniu plaušu armuotas betonas. Iš viso buvo pagamintos keturios plokštės. Siekiant nustatyti plieninio plaušo įtaką kompozitinių plokščių stiprumui ir standumui, atliktas eksperimentinis tyrimas. Eksperimentinių bandymų metu buvo matuojamos skersinės, išilginės, šlyties deformacijos ir įlinkiai. Bandymų rez… Show more

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Cited by 2 publications

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First report of heartworm (Dirofilaria immitis) infection in an imported dog in Lithuania

et al. 2019

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SummaryOver the past decade, increasing numbers of autochthonous cases of heartworm infection have been reported in the countries of Eastern Europe where previously only imported cases were described. In this report we have described the first clinical case of Dirofilaria immitis infection in an imported dog in Lithuania.In 2018, a 5-year-old male Spanish greyhound (Spanish galgo) was imported to Lithuania from southern Spain and referred to a small animal veterinary clinic in Vilnius for wellness screening. Circulating microfilariae and female antigens of D. immitis were detected using the Knott’s test and SNAP 4Dx Plus Test (IDEXX Laboratories, Portland, USA). The diagnosis was confirmed using molecular analysis. Treatment according to the guidelines recommended by the American Heartworm Society was applied. This is the first confirmed report of canine heartworm infection in an imported dog in Lithuania. Heartworm-infected dogs transported to North-Eastern Europe from endemic areas could act as microfilarial reservoirs for the local mosquito population, which could increase the risk of spreading the disease.

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First report of heartworm (Dirofilaria immitis) infection in an imported dog in Lithuania

et al. 2019

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Plieniniu Plaušu Armuotų Kompozitinių Plienbetoninių Plokščių įLinkių Iki Suirimo Analizė

Petkevičius

Valivonis

2010

Statybinės Konstrukcijos ir Technologijos

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Analysis of experimental and theoretical results of investigation into deflection of composite steel-concrete slabs is presented in the paper. Profiled steel sheeting (Holorib type) and steel fiber-reinforced concrete were used for specimens. For two slabs, the layer of concrete was reinforced with steel fiber, whereas the rest of them were not reinforced. Slabs were tested under static short-term load. The experimental investigation revealed that the use of steel fiber in composite slabs was effective. The meanings of deflections under the action of the bending moment M ≈0.6MR (where MR is the bending moment at failure of the slabs) were by 16–18% lower in the slabs with a steel fiber-reinforced concrete layer than in the slabs with a common concrete layer. The deflection of composite slabs directly depends on the rigidity of the shear bond between the profiled steel sheeting and the concrete layer. The method for the deflection analysis in composite slabs is based on the built-up bar theory. Influence of a cracked concrete layer on the deflection of the structure and plastic deformation in the compression zone of this layer are evaluated by this method. Furthermore, it evaluates the stiffness of separate layers and the stiffness of the shear bond between the profiled steel sheeting and the concrete layer. Experimental investigation was performed for determination of the shear characteristic for the bond between the steel sheeting and the concrete layer. Therefore, specimens were made of the same concrete mixture as that of the slabs. Theoretical analysis of deflection for the composite slabs was made. When the value of the bending moment is close to the service load M ≈0.6MR, agreement of the results of analysis with the experimental ones is sufficiently good. Ratio of the theoretical values to the experimental ones varies within the limits of ωobs / ωcall=1.01–1.03 for slabs with a usual concrete layer, and the ratio of ωobs/ ωcall=0.99–1.02 for slabs with a concrete layer reinforced with steel fiber.

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Kompozitinių plienbetoninių plokščių, armuotų plieniniu plaušu, savybių tyrimas

Cited by 2 publications

References 8 publications

First report of heartworm (Dirofilaria immitis) infection in an imported dog in Lithuania

First report of heartworm (Dirofilaria immitis) infection in an imported dog in Lithuania

Plieniniu Plaušu Armuotų Kompozitinių Plienbetoninių Plokščių įLinkių Iki Suirimo Analizė

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