吊索具计算.doc

钢丝绳允许拉力按下列公式计算：FgFg/K （14-2）式中 Fg钢丝绳的允许拉力（kN）；Fg钢丝绳的钢丝破断拉力总和（kN）；换算系数，按表14-4取用；K钢丝绳的安全系数，按表14-5取用。钢丝绳破断拉力换算系数 表14-4钢丝绳结构换算系数6190.856370.826610.80钢丝绳的安全系数 表14-5用途安全系数用途安全系数作缆风3.5作吊索、无弯曲时67用于手动起重设备4.5作捆绑吊索810用于机动起重设备56用于载人的升降机14637钢丝绳的主要数据 表14-3直径钢丝总断面积参考重量钢丝绳公称抗拉强度（N/mm2）钢丝绳钢丝14001550170018502000钢丝破断拉力总和（mm）（mm2）（kg/100m）（kN）不小于8.70.427.8826.2139.043.247.351.555.711.00.543.5740.9660.967.574.080.687.113.00.662.7458.9887.897.2106.5116.0125.015.00.785.3980.57119.5132.0145.0157.5170.517.50.8111.53104.8156.0172.5189.5206.0223.019.50.9141.16132.7197.5213.5239.5261.0282.021.51.0174.27163.3243.5270.0296.0322.0348.524.01.1210.87198.2295.0326.5358.0390.0421.526.01.2250.95235.9351.0388.5426.5464.0501.528.01.3294.52276.8412.0456.5500.5544.5589.030.01.4341.57321.1478.0529.0580.5631.5683.032.51.5392.11368.6548.5607.5666.5725.0784.034.51.6446.13419.4624.5691.5758.0825.0892.036.51.7503.64473.4705.0780.5856.0931.51005.039.01.8564.63530.8790.0875.0959.51040.01125.043.02.0697.08655.3975.51080.01185.01285.01390.047.52.2843.47792.91180.01305.01430.01560.052.02.41003.80943.61405.01555.01705.01855.056.02.61178.071107.41645.01825.02000.02175.060.52.81366.281234.31910.02115.02320.02525.065.03.01568.431474.32195.02430.02665.02900.0两支吊索的拉力计算表 简图简图夹角吊索拉力F水平压力H251.18G1.07G301.00G0.87G350.87G0.71G400.78G0.60G450.71G0.506500.65G0.42G550.61G0.356600.58G0.29G650.56G0.24G700.53G0.18G1.钢丝绳受力计算选用规格为65（637）公称抗拉强度1550 N/mm2的钢丝绳用于钢弦杆构件吊装。(1)钢丝绳允许拉力计算：FgFg/K（1）式中 Fg钢丝绳的允许拉力（kN）；Fg钢丝绳的钢丝破断拉力总和（kN），查表得65（637）钢丝破断拉力为2430kN；换算系数，查表取0.82；K钢丝绳的安全系数，做捆绑吊索取8；由公式（1）计算得65钢丝绳的允许拉力Fg= 0.822430/8=249.075 kN(2)双吊索钢丝绳的拉力计算钢结构安装吊装作业时采用规格为65（637）的钢丝绳双吊索双吊点抬吊，构件最大质量为80t， 吊装夹角选用60弦杆构件吊装每根吊索拉力计算：F=0.58G/2=0.58*800/2=232kN