A braced portal frame is shown in Figure P2.3. Beam and columns are of concrete of M25 grade. Size of column is 300 × 400 mm. Area of steel brace = 10 cm2 and length = 5 m. Determine the natural...

A braced portal frame is shown in Figure P2.3. Beam and columns are of concrete of M25 grade. Size of column is 300 × 400 mm. Area of steel brace = 10 cm2 and length = 5 m. Determine the natural period of vibration considering only the tension brace. If the initial displacement is 50 mm, and initial velocity is 0.5 m/s, plot the response up to 3 cycles.