A W310X86 beam with a yield stress of 345 MPa is simply supported over a span of 2.4 m and loaded with a uniformly distributed load. If the beam is laterally braced at the ends only, determine the allowable (LRFD) flexural strength. 439 kN-m 493 kN-m 394 kN-m O 349 kN-m

A WT305 × 41 standard steel shape is used to support the loads shown.  Assume w = 50 kN/m, LAB = 1.4 m, LBC = 2.8 m, and LCD = 1.4 m. Consider the entire 5.6 m length of the beam and determine:(a) the maximum tensile bending stress at any location along the beam (enter a positive answer), and(b) the maximum compressive bending stress at any location along the beam (enter a negative answer).

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Q7/ A precast beam is to be used as a bridge over a small roadway. Concrete dimensions are b= 500 mm, and h = 700 mm. The effective depth d = 600 mm. Concrete and steel strengths are 42 MPa and 420 MPa, respectively. Using approximately one-half the maximum tensile reinforcement permitted by the ACI Code (select the actual size of bar and number to be used), determine the design moment capacity of the girder. If the beam is used on a 9 m simple span, and if in addition to its own weight it must support railings, curbs, and suspended loads totaling 7 kN/m, what uniform service live load limit should be posted?