支架立杆稳定和地基承载力计算_2014.5

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1、WORD资料整理辽宁聚成工程项目管理联盟LiaoningJUCHENGengineeringprojectmanagementinstitute支架立杆稳定和地基承载力计算脚手架立杆底座和地基承载力计算是脚手架（支架）计算中的重要内容。1立杆底座计算1.1支撑立杆的稳定应按下列公式计算（1）不考虑风荷载时N/ΦA≤f（式1）（2）考虑风荷载时N/φA+Mw/W≤f（式2）式中N——计算立杆段的轴向力计算值；Φ——轴心受压构件的稳定系数，应按长细比λ按下表选择；λ——长细比，λ＝l0/i；l0——计算长度，按规定计算；i——立杆截面回转半径；A——立杆的截面面积

2、；完美格式可编辑WORD资料整理Mw——计算立杆段由风荷载设计值产生的弯矩，Mw=0.9×1.4Mwk；Mwk——计算立杆段由风荷载标准值产生的弯矩，按规定计算。f——钢材的抗压强度设计值，应取f=205N/mm2；W——立杆截面抗弯模量（cm2）。表1轴心受压构件的稳定系数Φλ012345678901.0000.9970.9950.9920.9890.9870.9840.9810.9790.976100.9740.9710.9680.9660.9630.9600.9580.9550.9520.949200.9470.9440.9410.9380.9360.9

3、330.9300.9270.9240.921300.9180.9150.9120.9090.9060.9030.8990.8960.8930.889400.8860.8820.8790.8750.8720.8680.8640.8610.8580.855500.8520.8490.8460.8430.8390.8360.8320.8290.8250.822600.8180.8140.8100.8060.8020.7970.7930.7890.7840.779700.7750.7700.7650.7600.7550.7500.7440.7390.7330.7288

4、00.7220.7160.7100.7040.6980.6920.6860.6800.6730.667900.6610.6540.6480.6410.6340.6260.6180.6110.6030.5951000.5880.5800.5730.5660.5580.5510.5440.5370.5300.5231100.5160.5090.5020.4960.4890.4830.4760.4700.4640.4581200.4520.4460.4400.4340.4280.4230.4170.4120.4060.4011300.3960.3910.3860.3

5、810.3760.3710.3670.3620.3570.3531400.3490.3440.3400.3360.3320.3280.3240.3200.3160.3121500.3080.3050.3010.2980.2940.2910.2870.2840.2810.2771600.2740.2710.2680.2650.2620.2590.2560.2530.2510.2481700.2450.2430.2400.2370.2350.2320.2300.2270.2250.2231800.2200.2180.2160.2140.2110.2090.2070

6、.2050.2030.2011900.1990.1970.1950.1930.1910.1890.1880.1860.1840.1821.2立杆的计算长度l0计算l0=k1k2(h+2a)式中k1——计算长度附加系数，按表2采用；k2——考虑支架整体稳定因素的单根立杆计算长度附加系数，按表3采用。完美格式可编辑WORD资料整理表2单根立杆计算长度附加系数k1步距h（m）h≤0.90.9＜h≤1.21.2＜h≤1.51.5＜h≤1.8k11.2431.1851.1671.163表3立杆计算长度附加系数k21.3风荷载标准值计算式中Wk———风荷载的标准值(kN/

7、m2);µz———风压高度变化系数,按现行标准《建筑结构荷载规范》(GB50009)规定采用;µs———支架及模板系数风荷载体型系数,应按表5规定采用;W0———基本风压值(kN/m2),按现行国家标准《建筑结构荷载规范》(GB50009)的规定采用,取重现期n=10对应的风压值。完美格式可编辑WORD资料整理表4风压高度变化系数表5支架的风荷载体系系数完美格式可编辑WORD资料整理表6辽宁地区城市风压值2立杆地基承载力计算N/Ad≤Kcfak式中N——立杆传至基础顶面的平均轴向力设计值；Ad——立杆基础的计算底面积，可按以下情况确定：工况Ad取值仅有立杆支座

8、（支座直接放于地面上）取支座板的底面积