Abstract
The research includes experimental study for behavior of HSC wide beams under bending and torsion moments. Nine beams of 1200×220×110 mm were tested. Parameters of the study were torque to bending moments ratio (T / M), longitudinal and transverse reinforcement ratios (ρ L & ρ t ). The results indicated that presence of torsion combined with bending moment significantly reduces the ultimate moment capacity (M u ) and results in changing beam failure from flexural mode to torsional or flexural-torsional mode. Also torsion effect results in reducing cracking moment capacity and propagation of inclined cracks combined to vertical cracks. These influences for torsion increase with increasing T / M ratio and ρ L and with decreasing ρ t . Increasing ρ L results in significant increase in Mu especially when T / M decreases, while increasing ρ t results in slight increase in M u and its effect decay as T / M decreases. Increasing T / M ratio makes Moment-deflection response softer especially in case of high ρ L . Increasing ρ L makes this response stiffer especially in case of pure bending whereas increasing ρ t slightly stiffens this response in advanced loading stages for high values of T / M. Torque-rotation response is stiffer as T / M ratio increases. Also, increasing ρ L makes the responses stiffer for all values of T / M while increasing ρ t makes it slightly stiffer in advanced loading stages. Mathematical expression for calculation of ultimate moment capacity for this type of beams was proposed and give results that have good agreement with experimental results. Keywords : wide beam, high strength concrete, bending, torsion, deflection, rotation. DOI: 10.7176/CER/12-12-05 Publication date: December 31 st 2020
Highlights
Wide beams are characterized by their large width which approximately equivalent to twice of their total depth or more (Haido & Musa 2013)
The use of reinforced concrete wide beams is advantageous for many reasons
Discussion of Results 9.1 First Cracking Moment From Table 4 and Figures (7) and (8), it is can noted that first cracking moment of HSC wide beams decreases with increasing T / M ratio or it decreases with application of torque moment combined with bending moment and this reduction is larger as applied torque is larger
Summary
Wide beams (thick slabs) are characterized by their large width which approximately equivalent to twice of their total depth or more (Haido & Musa 2013). The use of wide-shallow beams is becoming popular in one-way reinforced concrete joist floors for constructional and architectural advantages (Shuraim & Al-negheimish 2011) They are frequently used as economical transfer elements where the total structural depth must be kept to a minimum. Www.iiste.org (deflection and cracking), and increasing shear strength of them to avoid the shear failure without using web reinforcement This type of concrete was adopted in this study for all wide beams. All beams are reinforced by stirrups of φ 5 mm at 30 mm on sides of beams or at shear zones (out of bending – torsion zone) to prevent occurrence the shear failure
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
