Flexural behaviour of concrete‐filled steel hollow sections beams

Abstract

This paper presents an experimental study of normal mix, fly ash, quarry waste and low strength concrete (brick‐bat lime concrete) contribution to the ultimate moment capacity of square steel hollow sections. Fifteen simply supported beam specimens of 1200‐mm long steel hollow sections filled with normal mix, fly ash, quarry waste and low‐strength concrete and identical dimensions of hollow sections were experimented. Extensive measurements of such material properties, strain and deflection were carried out. Theoretical studies of ultimate moment capacity of a beam specimen were also calculated in this study for comparison's sake. These experimental investigation results showed that normal mix, fly ash, quarry waste and low‐strength concrete enhance the moment carrying capacity of steel hollow sections. Furthermore, in these studies it can be found that normal mix, fly ash and quarry waste concrete can be used in composite construction to increase the flexural capacity of steel hollow sections.

Santrauka

Pateikiamas normalaus, lakiuju pelenu, akmenu skaldymo atlieku ir mažo stiprumo (skaldytuju plytu kalkinio) betonu itakos kvadratinio skerspjūvio plieniniu vamzdžiu ribinei lenkiamajai galiai eksperimentinis tyrimas. Išbandyta penkiolika dviatramiu siju bandiniu iš 1 200 mm ilgio plieniniu tuščiaviduriu profiliuočiu, pripildytu normalaus, lakiuju pelenu, akmenu skaldymo atlieku ir mažo stiprumo betonu ir identišku matmenu tuščiaviduriu profiliuočiu. Atlikti dideles apimties medžiagu savybiu, santykiniu deformaciju ir ilinkiu matavimai. Lyginant teoriškai apskaičiuota siju laikomoji galia. Eksperimentinio tyrimo rezultatai parode, kad normalus, lakiuju pelenu, akmenu skaldymo atlieku ir mažo stiprumo betonai didina plieniniu tuščiaviduriu profiliuočiu lenkiamaja galia. Be to, iš šio tyrimo galima matyti, kad normalus, lakiuju pelenu ir akmenu skaldymo atlieku betonus galima naudoti kompozitiniu konstrukciju plieniniu tuščiaviduriu profiliuočiu lenkiamajai galiai didinti.

Keywords:

• in‐filled beams
• two‐point load
• analytical model
• ultimate moment capacity

Reikšminiai žodžiai::

• betonšerdes sijos
• dvitaške apkrova
• analitinis modelis
• ribine lenkiamoji galia