我要做一个1m*1m的独立柱平台，用18b的 槽钢作为支撑，高度有6米，上面要承受最大荷载11KN
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\u5148\u8ddf\u4f60\u4ecb\u7ecd\u4e00\u4e0b\u6750\u6599\uff0c\u4f60\u6240\u8bf4\u768410#\u69fd\u94a2\u5e94\u8be5\u662f\u70ed\u8f67\u69fd\u94a2\uff0c\u4ed6\u7684\u6750\u6599\u4e3aQ235A
\u5373\u6b64\u6750\u6599\u7684\u5c48\u670d\u6781\u9650\u4e3a235MPa\u3002\u69fd\u94a2\u7684\u622a\u9762\u79ef\u4e3a12.748cm²\u3002
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\u4e3a\u65b9\u4fbf\u8ba1\u7b97\uff0c\u4e5f\u4e3a\u4e86\u5b89\u5168\uff0c\u53d6\u69fd\u94a2\u9762\u79ef\u4e3a12cm²\uff0c\u538b\u5f3a\u8ba1\u7b97\u516c\u5f0fP=F/S\uff0c\u5176\u4e2dF\u4e3a\u91cd\u529b\uff0cS\u4e3a\u53d7\u529b\u7684\u6a2a\u622a\u9762\u79ef\uff0c\u90a3\u4e48\u53ef\u521d\u7565\u8ba1\u7b97\u51fa\u538b\u5f3aP=277MPa\uff0c\u6bcf\u6839\u69fd\u94a2\u6240\u53d7\u7684\u538b\u529b\u5747\u5927\u4e8e\u5b83\u80fd\u627f\u53d7\u7684\u5c48\u670d\u6781\u9650\uff0c\u6240\u4ee5\u662f\u4e0d\u53ef\u4ee5\u7684\u3002
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\u94a2\u6750\u7406\u8bba\u91cd\u91cf\u8ba1\u7b97\u7684\u8ba1\u91cf\u5355\u4f4d\u4e3a\u516c\u65a4\uff08 kg \uff09\u3002\u5176\u57fa\u672c\u516c\u5f0f\u4e3a\uff1a W \uff08\u91cd\u91cf\uff0c kg \uff09 = F \uff08\u65ad\u9762\u79ef mm2 \uff09\u00d7 L \uff08\u957f\u5ea6\uff0c m \uff09\u00d7\u03c1 \uff08\u5bc6\u5ea6\uff0c g/cm3 \uff09\u00d7 1/1000\u94a2\u7684\u5bc6\u5ea6\u4e3a\uff1a 7.85g/cm3 \uff0c\u5404\u79cd\u94a2\u6750\u7406\u8bba\u91cd\u91cf\u8ba1\u7b97\u516c\u5f0f\u5982\u4e0b\uff1a \u540d\u79f0\uff08\u5355\u4f4d\uff09 \u8ba1\u7b97\u516c\u5f0f \u7b26\u53f7\u610f\u4e49 \u8ba1\u7b97\u4e3e\u4f8b \u69fd\u94a2\uff08kg/m\uff09 W=0.00785 \u00d7[hd+2t \uff08b ?C d \uff09+0.349 \uff08R2 ?C r 2 \uff09] h= \u9ad8 b= \u817f\u957f d= \u8170\u539a t= \u5e73\u5747\u817f\u539a R= \u5185\u5f27\u534a\u5f84 r= \u7aef\u5f27\u534a\u5f84 \u6c42 80 mm \u00d7 43mm \u00d7 5mm \u7684\u69fd\u94a2\u7684\u6bcfm \u91cd\u91cf\u3002\u4ece\u51b6\u91d1\u4ea7\u54c1\u76ee\u5f55\u4e2d\u67e5\u51fa\u8be5\u69fd\u94a2t \u4e3a8 \uff0cR \u4e3a8 \uff0cr \u4e3a4 \uff0c\u5219\u6bcfm \u91cd\u91cf=0.00785 \u00d7[80 \u00d75+2 \u00d78 \u00d7\uff0843 ?C 5 \uff09+0.349 \u00d7\uff0882?C4 2 \uff09]= 8.04kg
不如用4根6﹟（标准）角钢做成井字架600×600×6000即可，用单一根槽钢承载能力是够了，但易晃动，如果有支撑可以用的，以防失稳。绛旓細2*2*3.14*2+4*3.14*1=37.68
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绛旓細瑙掗熷害=1m/s/0.25m=4寮у害/绉 鍛ㄦ湡=2*3.14159/4=1.57绉 鍚戝績鍔=璐ㄩ噺*瑙掗熷害骞虫柟*鍗婂緞=0.4kg锛*4^2*0.25=1.6鐗涢】
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绛旓細(1)T=mg+F鍚=mg+mv^2/R=1*10+1*v^2/1=10+v^2=46N v=6m/s 蠅=v/R=6/1=6rad/s (2)螖Ek=m(v'^2-v^2)/2=1*(10^2-6^2)/2=32J 螖Ek=W鍚堝=Wp-Wf=mg(h-R)-Wf=1*10*(6-1)-Wf=50-Wf=32J Wf=18J ...
绛旓細绗涓涓鏄眰渚ч潰绉紝鐢ㄧ洿寰勪箻3.14涔1.5涔5
