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【简答题】
某预应力屋架采用后施工,构件孔道长度为24.8m,预应力筋采用钢丝束1-24 Æ s 5 ,A p =470.4mm 2 。预应力筋采用一端,锚板厚度为40mm,锚杯高度为80mm,螺帽厚度为35mm,钢丝镦头预留量为10mm。程序采用0→1.03σ con ,σ con =375N/mm 2 ,时从0.1~1.03σ con 量测得预应力筋伸长值为115mm,时混凝土的弹性压缩值取6mm。试计算钢丝下料长度和施工最大力。(ΔL=Δ l 1 +Δ l 2 - c )
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