Experimental Study on Application of T-headed Bars for Railway
Structures
By K. Yoshitake, A. Ogawa, K. Kimura and K. Dewa
Concrete Journal, Vol.45, No.3, Mar. 2007
- Synopsis
- Recently, the revision of seismic design codes effective after the Hyogo-ken Nanbu earthquake have increased the amount of shear reinforcement for civil structures. Especially railway structures consequently require a large amount of reinforcing bars, leading to a decrease in the productivity of arrangement of reinforcing bars and filling capacity of concrete. The authors have developed the new construction method using deformed reinforcing bars with increased diameter at the bat ends, T-headed deformed bars as shear reinforcement of concrete instead of conventional hooked bars. This method has been successfully applied to many actual structures like Box culverts and LNG tanks. However, there are two issues in order to apply T-headed bars to railway structures. Therefore, the authors carried out two types of experiments: static shear tests of 4 rectangular beams with high shear reinforcement ratio; and fatigue tests of 8 rectangular beams using T-headed bars as shear reinforcement. As a result, it was verified that T-headed bars function sufficiently as shear reinforcement of RC members under both conditions.
- Keywords:
- T-headed bar, congested arrangement of reinforcing bars, anchor of reinforcing bars, shear fatigue, high frequency induction heating method
