Answer Happy

The figure below represents a simply supported deep beam of reinforced concrete. The beam bears dead load g and live load q, which are modelled as point loads of Pg and Pq. The design values of the point loads are given in the figure. The lateral movement of the beam is prevented at the A support. Live load P =2*240 KN Permanent load Pg=3*200 KN 2 m 2 m 2 m 2 m 4 m А. B 0.5 m 8 m a) Define a strut-and-tie model that can be used to design the beam for the given loading. (3p) b) Present the parts of the struts in your model which the strength value given in the eq. 6.55 below can be applied to. (1) The design strength for a concrete strut in a region with transverse compressive stress or no transverse stress may be calculated from Expression (6.55) (see Figure 6.23). Rd.max A transverse compressive stress or no transverse stress A Figure 6.23: Design strength of concrete struts without transverse tension Che.max = fed It may be appropriate to assume a higher design strength in regions where multi-axial compression exists. c) Using your model evaluate the amount of the principal tensile reinforcement. The design strength of the reinforcement in 435 MPa.