Indian Journal of Science and Technology
Year: 2016, Volume: 9, Issue: 7, Pages: 1-17
Mojtaba Hosseini1*, Hamid Reza Ashrafi2 , Peyman Beiranvand3 and Behzad Ghanbari4
1Deparment of Civil Engineering, Faculty of Engineering, Lorestan University, Khorramabad - 68137-17133, Iran; [email protected] 2Deparment of Civil Engineering, Faculty of Engineering, Razi University, Kermanshah, Iran 3Department of Civil Engineering, Technical and Engineering Faculty, Razi University, Kermanshah, Iran 4Department of Civil Engineering, Structure, Technical and Engineering Faculty, Lorestan University, Khorramabad - 68137-17133, Iran
*Author for Correspondence
Deparment of Civil Engineering, Faculty of Engineering, Lorestan University, Khorramabad - 68137-17133, Iran; [email protected]
Background/Objectives: Nonlinear analysis of torsion in reinforced concrete members after developing initial crack is a significant effect on piece life time. Methods/Statistical Analysis: As a result of integration and cohesion of members in the reinforced concrete structures Torsion typically occurs. Reduced torsional stiffness problem was presented after semibrittle break out in concrete due to presence of initial cracks in outer surfaces of concrete element in determining torsional stiffness. Findings: The idea was that reduced torsional stiffness is approximately one-tenth of its value before cracking and this is very effective on the distribution of anchors in the structure. After these studies, different torsion theories were presented which measured the reduced stiffness by using different methods. In this paper, by using these theories, a code was written for torsional analysis of reinforced concrete after cracking called “nlarctm” and 23 rectangular cross-sections were controlled and compared by this program. Comparisons of anchor changes was based on the torsion angle and results indicated that cross-section number (18) has higher torsional strength than similar cross-sections. Applications/ Improvements: The results of this research shows that by comparing three effects the resistance of reinforcements, compressive strength and the distance of collars, it’s concluded that all of them are very effective in increase or decrease.
Keywords: Beam, Concrete, Initial Crack, nlarctm Code, Torsional Stiffness
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