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某无积灰的石棉水泥波形瓦屋面,屋面坡度1/2.5,普通单跨简支槽钢檩条如图14-5所示,跨度为6m,跨中设一道拉条,水平投影檩距0.75m。石棉水泥瓦(含防水层等)沿坡屋面的标准值为0.425kN/m2,檩条(含拉条、支撑)沿坡屋面的自重为0.1kN/m(垂直于屋面), 根据以上题干,回答14~16题 屋面均布活载水平投影标准值为0.50kN/m2。钢材用Q235。檩条选用槽钢[10,Ix=173.9cm4,Wx=34.8cm3,Wymax=14.2cm3,Wymin=6.5cm3,ix=3.99cm,iy=1.37cm。 檩条跨中截面a点进行抗弯强度验算时,其应力值(N/mm2),与下列何项数值最为接近? (
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAAA5ElEQVRYR2NkGGDAOMD2M+B0wKpVq9huv/jbxPD/fxwDA4MkhQ59zsDIuEhVgrkuLCzsF7JZOB3QOml5B8P//+UUWoyqnZGxszovsoI4B0xc9gyfzxmZmb2rcsK3IRvWMWm599///7fgcfTz6vwoKWId8B+f75kZGX0q8iK3kugAhur8KJRQxx0FE5fhdQC5UTPqgNEQGA2B0RAYDYHREBgNgaETAuTW96TqG7yt4tbRFhGRIQBqHTP9+8dIoDUMTxqk5AK8zXKYiaDWMYhNpANIaJYPdMdkwLtmpOZnctUPeDkAAP6tmiH1ggTLAAAAAElFTkSuQmCC)
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