In-Situ Investigation of Concentration of Strains Around an Implanted Bar

Keras, Valerijus; Roličius, Jonas

doi:10.3846/13923730.2005.9636331

Cited by 4 publications

(4 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Naudojant šiuos strypus gaunama iš esmės standi jungtis, kurioje irimo metu fiksuojama 0,5-1,0 mm slinktis (Gečys 2010). Plieniniai strypai medienos elemente gali būti įklijuojami įvairiais kampais (Keras, Roličius 2005). Įklijuotieji plieniniai strypai plačiai taikomi kampinėms pusiau standžioms rėmų jungtims konstruoti (Vašek, Vyhnalek 2006;Vašek 2008).…”

Section: Ankstesni Pusiau Standžių Mazgų Konstravimo Ir Elgsenos Tyrimaiunclassified

Experimental Investigation of Glued Laminated Timber Beam-to-Beam Connection / Klijuotosios Medienos Sijos Elementų Tarpusavio Jungties Eksperimentinis Tyrimas

Gečys

Daniūnas

Gurkšnys

et al. 2013

Engineering Structures and Technologies

View full text Add to dashboard Cite

Semi rigid mounting joints of glued laminated timber elements are connections that are fully assembled on construction site and capable to handle bending moments, axial and shear forces. The need for new type of semi rigid timber elements’ connection is obvious. The manufacturing possibilities of glued laminated timber elements’ are wide: straight element's length may extend up to 40 m or curved axis elements with dimensions of up to 10 meters in height, therefore, manufacturers, erectors and others face with transportation problems of non-standard, oversized elements. Semi-rigid mounting joints are used to solve this problem. In factory non-standard, oversized, glued, laminated timber elements are cut into standard transportation dimensions and fully mounted into integral element on construction site, using semi rigid mounting joints. In this article semi-rigid, glued, laminated timber elements’ joints which are used as beam to beam, beam to column and column to foundation connections are analysed. Also the main design principles of semi-rigid joints are discussed. The new type of semi rigid beam to beam connection is proposed and experimentally analysed. The experimentally and theoretically analysed connection is composed of welded steel details which are anchored into timber element. The main experiment is four point bending; the analysed connection is in the middle of the span. The beam's span is 3.20 m; the dimensions of the timber element's cross section are: width 200 mm; height 400 mm; mounting bolts are M16. Glued laminated timber strength class is GL24h. The tight contact between timber element and steel detail is created by anchoring steel detail's T shape part into timber element. The initial movement between timber element and steel detail is eliminated using fillers. Two types of fillers are used in these experiments: two component polyurethane and cement based filler with polymer fibres. Two joints with different fillers are tested in laboratory experiments. Bending bearing capacity and stiffness (displacements) of the joints’ are determined in laboratory. Experimental bearing capacities are compared with theoretical calculations according to European (EC5) and Lithuanian timber structures design codes. Conclusions and recommendations are presented for further experiments and computer simulations. Santrauka Straipsnyje analizuojami pusiau standūs montuojamieji klijuotosios medienos konstrukcijų mazgai, kurie naudojami elementams sujungti per ilgį, rėmų kampinėms jungtims tarp kolonos ir sijos bei jungtims tarp kolonos ir pamato. Aptariami pagrindiniai pusiau standžių montuojamųjų medinių konstrukcijų mazgų konstravimo principai. Pasiūlytas ir eksperimentiškai tirtas per ilgį sujungtų lenkiamųjų klijuotosios medienos sijos elementų mazgas. Mazgas įrengiamas naudojant plienines detales, suvirintas iš lakštinio plieno, kurios inkaruojamos medienos elementuose. Kontaktas tarp medienos ir metalo užtikrinamas ir pradinis mazgo slankumas panaikinamas užpildant tarpus tarp medienos ir metalo užpildu. Pasirinkti du skirtingo pagrindo (sudėties) užpildai: dviejų komponentų poliuretano ir cementinis, kurio sudėtyje yra polimerinių plaušų. Nustatytas cementinio užpildo lekiamasis ir gniuždomasis stipriai. Eksperimentinės jungčių laikomosios galios palyginamos su teoriniais skaičiavimais pagal Lietuvos ir Europos medinių konstrukcijų projektavimo normas. Pateikiamos išvados ir rekomendacijos tolesniems tyrimams.

show abstract

Section: Ankstesni Pusiau Standžių Mazgų Konstravimo Ir Elgsenos Tyrimaiunclassified

Experimental Investigation of Glued Laminated Timber Beam-to-Beam Connection / Klijuotosios Medienos Sijos Elementų Tarpusavio Jungties Eksperimentinis Tyrimas

Gečys

Daniūnas

Gurkšnys

et al. 2013

Engineering Structures and Technologies

View full text Add to dashboard Cite

show abstract

“…Šiuo klausimu yra nemažai darbų, kuriuose autoriai nagrinėja strypus, įklijuotus medienoje: skersai pluošto (Blass, Laskewitz 2001), išilgai medienos pluošto (Rossignon, Espion 2008;Serrano 2001;Bengtsson et al 2000;Madhoushi, Ansel 2008a;Madhoushi, Ansel 2008b;Chans et. al 2010) ir kampu į medienos pluoštą (Keras, Roličius 2005).…”

Section: įVadasunclassified

“…(1) išraiška įvertina medienos skaičiuotinį skeliamąjį stiprį, kuris pagal STR yra vienodas tiek išilgai, tiek skersai medienos pluošto. Remiantis kai kurių autorių atliktais eksperimentiniais tyrimais (Keras, Roličius 2005;Blass, Laskewitz 2001) ir VGTU magistrų baigiamaisiais darbais (Gudelis 2009) ši prielaida nėra teisinga, nes kampu įklijuoto strypo ištraukiamasis atsparis yra didesnis. Medienoje kampu įklijuoto strypo ištraukiamoji galia yra apie 20 % didesnė nei išilgai ir skersai.…”

Section: Plieninių Sriegtųjų Strypų įKlijavimo Medienoje Metodaiunclassified

“…Medienoje kampu įklijuoto strypo ištraukiamoji galia yra apie 20 % didesnė nei išilgai ir skersai. Tiriant plieninio sriegtojo strypo, įklijuoto medienoje, elgseną, esant skirtingiems įklijavimo kampams pluošto atžvilgiu, nustatyta, kad optimalus strypo įklijavimo kampas yra 30-50º (Keras, Roličius 2005). 1 pav.…”

Section: Plieninių Sriegtųjų Strypų įKlijavimo Medienoje Metodaiunclassified

See 1 more Smart Citation

Jungties Tarp Įklijuoto Plieninio Sriegtojo Strypo Ir Medienos Elgsenos Tyrimas

Gečys

Gurkšnys

Rasiulis

2011

Statybinės Konstrukcijos ir Technologijos

View full text Add to dashboard Cite

The article discusses the main methods for steel threaded rods pasted into timber. Single – threaded steel rod carrying capacity glued onto glulam (timber cross section – 100 x 100 mm, threaded rod – M12 and M16) has been experimentally determined. Behaviour based on the experimental results of two different methods for pasting rods into timber has been summarized: the first threaded steel rod was glued into 4 mm bigger diameter hole while the second – rod chased into 2 mm smaller diameter hole. The conducted experiment used 800 mm length glulam beams; threaded steel rods were glued to both ends of specimens (equal theoretical carrying capacity). The experiment in the tension of both ends was carried out. The obtained results were compared with theoretical expressions submitted in EC 5 – 1 – 1:2005 and STR 2.05.07:2005. The main dependences of geometrical parameters and carrying capacity have been provided. The main collapse forms of specimens and manufacturing defects having influence on the final carrying capacity and behaviour of the joint have been observed. Using the first method, a failure in the pasted rod occurs suddenly when timber splits along the fibre; in the second case, a failure is plastic when timber is compressed under thread. Additional experiments must be carried out using the first technology increasing the class of the strength of the pasted rod as under the maximum length of paste, in all cases, failure in the pasted rod occurred when a steel bar cracked. Along with an increase in the diameter of the rod, the dispersion of the results of the affixed slender part is increasing. Maximum variation in the results of applying the first method is 10%, whereas the second method of attaching makes 50%. Compared to the first method of attaching, the results of theoretical bearing capacity indicate that tests have an adequate margin which is equal to or is more than 2,0. A comparison of the second method of attaching results to theoretical bearing capacity makes clear that the experimental results of the tests have too low safety factor and in some cases are less than 1.0. This is due to the fact that the counting of attaching technology in some cases must be based on local compressed timber strength. The experimental study of two different methods for attaching steel bars reveals that the first method can be used in design practice considering both documents STR 2.05.07:2005 and EC 5-1-1:2005. The second method of attaching must be developed to ensure smooth rod surface coating adhesive. Attaching the second method should also be created in the exact form corresponding to the disintegration of the calculation model.

show abstract

Experimental Investigation of Glued Laminated Timber Beam to Beam Connections Filled with Cement Based Filler

Gečys

Daniūnas

2013

Procedia Engineering

View full text Add to dashboard Cite

In-Situ Investigation of Concentration of Strains Around an Implanted Bar

Cited by 4 publications

References 2 publications

Experimental Investigation of Glued Laminated Timber Beam-to-Beam Connection / Klijuotosios Medienos Sijos Elementų Tarpusavio Jungties Eksperimentinis Tyrimas

Experimental Investigation of Glued Laminated Timber Beam-to-Beam Connection / Klijuotosios Medienos Sijos Elementų Tarpusavio Jungties Eksperimentinis Tyrimas

Jungties Tarp Įklijuoto Plieninio Sriegtojo Strypo Ir Medienos Elgsenos Tyrimas

Experimental Investigation of Glued Laminated Timber Beam to Beam Connections Filled with Cement Based Filler

Contact Info

Product

Resources

About