List of top Reinforced Concrete Structures Questions

Consider the built-up column made of two I-sections as shown in the figure, with each batten plate bolted to a component I-section of the column through 6 black bolts. Each connection of the batten plate with the component section is to be designed for a longitudinal shear of 70 kN and moment of 10 kN.m. The minimum bolt value required (in kN) is ....... (rounded off to the nearest integer).
Consider the singly reinforced section of a cantilever concrete beam under bending, as shown in the figure (M25 grade concrete, Fe415 grade steel). The stress block parameters for the section at ultimate limit state, as per IS 456: 2000 notations, are given. The ultimate moment of resistance for the section by the Limit State Method is \underline{\hspace{2cm} kN.m (round off to one decimal place).} \includegraphics[width=0.75\linewidth]{image88.png}
With regard to the shear design of RCC beams, which of the following statements is/are TRUE?
Consider a doubly reinforced RCC beam with the option of using either Fe250 plain bars or Fe500 deformed bars in the compression zone. The modulus of elasticity of steel is \( 2 \times 10^5 \, \text{N/mm}^2 \). As per IS456:2000, in which type(s) of the bars, the stress in the compression steel \( (f_{sc}) \) can reach the design strength (0.87 \( f_y \)) at the limit state of collapse?
A singly reinforced concrete beam of balanced section is made of M20 grade concrete and Fe415 grade steel bars. The magnitudes of the maximum compressive strain in concrete and the tensile strain in the bars at ultimate state under flexure, as per IS 456: 2000 are \underline{\hspace{2cm}, respectively. (round off to four decimal places)}