ANALYSIS OF RECTANGULAR‐SHAPED COLLAR CONNECTORS FOR COMPOSITE TIMBER‐STEEL‐CONCRETE FLOORS: PUSH‐OUT TESTS

Author:

Faggiano Beatrice1,Marzo Anna1,Mazzolani Federico M.1,Calado Luis M.2

Affiliation:

1. Dept of Structural Engineering, University of Naples “Federico II”, Piazzale Tecchio 80, 80125 Naples, Italy

2. Dept of Civil Engineering and Architecture, Istituto Superior Tècnico of Lisboa, Av. Rovisco Pais 1049-001 Lisbon, Portugal

Abstract

The paper deals with the experimental analysis of an innovative connection system for composite timber‐steel‐concrete floors. The connection device consists of a collar composed by two or more parts, astride the timber beam, bolted together at adjacent wings. A rubber layer is interposed at the collar‐beam interface. The slipping action transmission is guaranteed by the superior wings of the collar or by a steel stud, purposely welded to the collar in the upper part, which are immersed in the concrete cast. In this paper push‐out monotonic tests on several rectangular‐shaped configurations of the connection system are presented, being part of a more comprehensive experimental campaign, aimed at the system performance evaluation and optimization. First, the preliminary numerical analyses, meant to define both the best geometrical characteristics of the specimens and the configuration of the testing apparatus, are illustrated. Then the push‐out tests, considering subsequent improvements of the connection system are detailed. The connection behaviour is discussed in terms of force‐slip relationship. Santrauka Pateikiami inovatyvios jungčių sistemos, taikomos medžio, plieno ir betono perdangose, eksperimentiniai tyrimai. Jungtį sudaro apkaba, sudaryta iš dviejų ar daugiau dalių. Ši jungtis apjuosia medinę siją, o atskiros jos dalys tarpusavyje sujungiamos varžtais. Tarp apkabos ir medžio paviršių dedamas gumos intarpas. Šlyties įtempius, atsirandančius medinės sijos ir gelžbetoninės perdangos sąlyčio zonoje, perima sparninės jungės arba prie apkabos viršutinės dalies privirintas plieno strypas. Straipsnyje pateikiami naujos jungčių sistemos kai kurių stačiakampio formos apkabų eksperimentinių išstūmimo bandymų rezultatai. Pateikti tyrimai yra dalis plačios eksperimentinių tyrimų programos, kuria siekiama atlikti naujos sistemos elgsenos analizę ir optimizavimą. Pirmiausia pateikiami preliminarūs skaitinės analizės rezultatai. Ši analizė skirta optimaliausioms geometrinėms charakteristikoms bei formoms parinkti. Paskui, priėmus atitinkamus geometrinių matmenų ir formų patikslinimus, atlikti išstūmimo eksperimentiniai tyrimai. Jungčių elgsena nagrinėta analizuojant jėgos ir praslydimo priklausomybes.

Publisher

Vilnius Gediminas Technical University

Subject

Strategy and Management,Civil and Structural Engineering

Reference16 articles.

1. Bathon, L. and Clouston, P. Experimental and numerical results on semi‐prestressed wood‐concrete composite floor systems for long‐span applications. Proc of the 8th World Conference on Timber Engineering WCTE 2004. June14–172004, Lathi, Finland, Canada. Vol. 1, pp.339–344.

2. Bathon, L. and Graf, M. A continuous wood‐concrete‐composite system. Proc of the 6th World Conference on Timber Engineering WCTE 2000 “Engineered Wood Building Technology for the New Millennium “. July312000, Whistler, Canada. 3 August, (paper 8.2.2 in CD)

3. Composite concrete-timber structures

4. Innovative steel connections for the retrofit of timber floors in ancient buildings: A numerical investigation

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