Examples of Fire Safety Engineering calculations. - Cooke On Fire

∆mid −heightTherefore:α H=2∆mid − height= 200 ⎨2⎬ = 800( T1− T2 ), it is clear that deflection varies as the square of the height.2 d2⎧ 6⎩ 3⎫⎭mm3.4 The lateral bowing of a heated slender steel memberA very slender vertical steel rod 2m long is position-fixed at both ends, i.e. the rod is pinendedand the ends cannot move axially. It is then heated uniformly along the wholelength through a temperature of 400 o C. Determine the lateral bowing deflection at midlengthassuming a) the rod bows into a circular arc and b) the rod does not shorten due tocompression caused by axial restraint at the ends.20degCL=2mD420degCFigure. Effect of suppressing axial expansion of slender elementFrom the literature (Cooke G M E, Stability of lightweight structural sandwich panelsexposed to fire, Fire and Materials, 2004: 28: pp299-308 (for full details go to MyPublications, Sandwich panels)D = L( 0.375αT)1/ 2−61/ 2D = 2 (0.375×14×10 × 400) = 0.0916m3.5 The hypothetical expansion-restraint force for a squat steel sectionA solid steel section is 150mm square and 0.5m long. It is longitudinally restrained at itsends so that it is unable to expand longitudinally. It is heated from room temperature (say6