The diagonal tension Which results in ultimate failure due to development of diagonal tension cracks, depends on
Diagonal tension is caused by shear stress = Shear Force/ (b.d)
Thus, higher the effective depth lower will be the shear stress and lower will be the length of the crack.
Moreover, the shear tension crack develops only in the shear span. Lower the shear span (where shear force is constant) lower will be the length of the crack.
The development length in compression for a 20 mm diameter deformed bar of grade Fe-415 embedded in concrete of grade M-25, whose design bond stress is 1.40 N/mm2 is
For bars in compression the value of bond stress is increased by 25%.
For deformed bars value of bond stress is increased by 60%
The main reason for providing number of reinforcing bars at a support in a simply supported beam is to resist in that zone
Reinforcing bars are provided at the support to develop adequate bond between concrete and steel, so that adequate bond stress is developed between them within development length.
Consider the following statements:
1. Development length includes anchorage value of hooks in tension reinforcement.
2. The development length of each bar of bundled bars shall be that for the individual bar, increased by, 33% for three bars in contact.
3. Deformed bars may be used without end anchorage provided development length requirement is satisfied.
Which of these statements is/are correct?
In case of bundled bars in contact the development length is increased than that for individual bar by,
1. 10 % for two bars in contact
2. 20% for three bars in contact
3. 33% for four bars in content
An RC structural member rectangular in cross section of width b and depth D is subjected to a combined action of bending moment M and torsional moment T. The longitudinal reinforcement shall be designed for a moment Me given by
The longitudinal reinforcement shall be designed to resist an equivalent bending moment,
Which one of the following is the correct expression to estimate the development length of deformed reinforcing bar as per IS code in limit state design?
where φ is diameter of reinforcing bar, σs is the stress in the bar at a section and ζbd is bond stress
As per clause 26.2.1 of IS:456-2000, the development length Ld is given by,
φ = nominal diameter of bar
σs = stress in the bar at the section considered at design load
ζbd = design bond stress for plain bars
The value of ζbd should be increased by 60% for deformed bars.
When HYSD bars are used in place of mild steel bars in a beam, the bond strength
When HYSD bars are used in place of mild steel bars bond stress is increased by 60%.
What is the bond stress acting parallel to the reinforcement on the interface between bar and concrete?
What is the anchorage value of a standard hook of a reinforcement bar of diameter D?
As per clause 22.214.171.124 of IS : 456-2000, the anchorage value of a standard U-type hook shall be equal to 16 times the diameter of the bar
The bond strength between steel and concrete is due to