Advantages and disadvantages of symmetrical pitch steel lattice truss construction

The following diagram shows a partial floor framing plan of an elevated walkway building connecting an airport terminal building to the adjacent garage. The concrete floor is not post- tensioned. Material properties are: - Concrete weight: wt = 150 pcf - Concrete compressive strength: f'c = 4000 psi - Steel tensile strength: fy = 60 ksi - Stirrup consists of #4 bar - Framing members are not exposed to weather or in contact with soil. Use ASCE Table 4.1 to determine the design live load for this floor. 30-0¹ S Colm- Ö 90-0 - Mark 54 59 25 30-0¹ N BI -Sinder ASCE 7-10 Chapter 4 Live Load.pdf 50 psf 60 psf 100 psf 150 psf 2

Designers typically specify longitudinal reinforcement on all four sides of a square column cross section for which of the following reasons? Check all that apply. Bending moments can act about two section axes, not just one O There is less chance for steel placement mistakes during construction There is additional axial strength compared to a design with longitudinal steel on only two sides

ASSIGNMENT #6 CASE 2 Purlin Design The figure shown has trusses 5.5m apart with midpoint sag rods and Purlins spaced 2.5m on center. The roof truss is inclined 1 vertical to 2 horizontal. The weight of roofing materials is 0.8 kPa, wind load is 0.7 kPa perpendicular to the roof surface, minimum roof live load is 0.6 kPa. Design a channel section of steel Fy = 345 mPa, for the purlins. Use LRFD and ASD of NSCP 2015.