Slenderness Ratio Factor. What Slenderness Ratio Factor does the building design use? 0.9. Curved Section Design. How ma
Resource: Compare Before You Buy Guide - Questions to Ask Truss, Bracing, and Purlin Design Chord Gauge - What thickness of steel is being used in the chords? Chord Diameter - What is the diameter of the chord steel? Web Gauge - What is the thickness of steel being used in the web? Web Dimension - What are the dimensions of the web steel? Truss Depth - What is the truss depth? Wind Bracing - How many bays are wind braced? End Bay Purlins - How many purlins are in the end bays? Braced Purlin Size - What are the specifications of the braced roof purlins? Unbraced Purlin Size - What are the specifications of the unbraced roof purlins? Cross Cable Size - What size are the cross cables being used? Sway Cable Size - What size are the sway cables being used? Does your building design consider both vertical and horizontal fabric tension in combination with snow and wind loads on the end trusses? What safety factor for cables has been used? Steel Weight Comparison - Have you compared the weight of steel being used? Snow Shed Is the assumption about the amount of snow commensurate with the amount that is allowed in the code? What roof slope is being considered? What slope factor is used? (0.667 in Canada and 0.727 in the US) Combined Snow and Wind Loads Does the building design take into account the appropriate exposure factor as per the NBC? Remember, open terrain should be used when building exposure is in question. Fabric as Bracing Does the building design use the fabric to give the building trusses lateral strength? Specified Steel Strength and Thickness Does the design account for web punching or chord plastification? You may require larger web material. Is the steel strength and thickness used in the design in accordance with the building code OR is it based on the strength and thickness as advertised by the steel manufacturer? Slenderness Ratio Factor What Slenderness Ratio Factor does the building design use? Curved Section Design How many segments does your buidling design use to more accurately represent a curved truss section? Coupler Design Does the design account for eccentricity at the splice locations? Thermal Expansion Is your building unheated? If so, what thermal factor is being used? If your building is over 100m (300') long, does it factor in an expansion joint? Use & Occupancy Does the design assume the appropriate occupancy rating? If your building is to be occupied, it needs to have an occupancy factor of at least 1.0. Enclosure Does your building design include doors and/or windows? Have these additional wind pressures been accounted for in accordance with the building code? Calculation Package Comparison Is the supplier willing to provide a Calculation Package for comparison sake?
