貨架承載力計算（單位：公斤）橫梁長度10001200150018002000220023002400250026002700280030003300抱焊梁80X50X1.5264322021982180217231651158515241468141513211201100X50X1.55487365830482743249423862286219521102032195918291662100X50X2.0470639223530320830692941282327152614252123532139110X50X1.56328421935153164287627512636253124332343226021091917120X50X1.5720040003600327231303000288027692666257124002181120X50X2.051704653423040463877372235793446332331022820140X50X1.54555414039603795364435033374325330362760140X50X2.05877534351104897470245214353419839183562P型梁50X30X1.235828723821550X30X1.546537330928025424360X40X1.515001250100083375068065062560X40X2.0225018001500135012271173112580X50X1.5525042003500315028632739262525202423233380X50X2.07200580048504300395038003600350033503200110X50X2.0950080007400650060005750550052005000矩形管50X30X1.5283022601880170050X30X1.83930327026202180196050X30X2.0360028802400216060X40X1.5570047503800315028502590247560X40X1.8669055804460372033403040290060X40X2.060004800400036003270313080X40X1.51236098808240741067406440618080X40X2.02808023400187201560014040127601220011700100X50X2.044640372002976024800223202029019400186001785017170165001.抱梁和矩形管截面橫梁的承載能力計算：貨架的承載能力為P（總載重），貨架材料的許用應力為［。］，橫梁長度為L,抗彎截面模量為WZ。按簡支梁承受均布載荷計算，其承載力為：八12"WP= ZL對Q235，取許用應力為120MP.，對Q215取105MPs對Q195取90MPa。因此對后兩種材料的貨架承載力，需在Q235的基礎(chǔ)上分別乘以系數(shù)0.875、0.75。2.P型梁橫梁承載能力計算：首先計算P型梁橫截面形心，然后計算IX、IY、IXY、LX、LY。計算彎曲中心X0的位置X= u誑0'人弋假設彎曲橫向力作用與臺階中點。P型梁受彎曲、扭轉(zhuǎn)共同作用。分別按彎曲和扭轉(zhuǎn)計算應力，然后按第三強度理論確定極限載荷。扇性慣性積的計算公式為：公式中：若b>x,h>y，則?。海╞—x0,（h-y）。1c1c 1c1cP型梁的扭矩在梁端最大，跨中最小，接近與零。因此按近似計算，可分別在跨中計算彎曲強度、支座端計算扭轉(zhuǎn)強度。最大扭矩為：qlXp?；蛘撸篗t=PX02由于X0VVl。因此最大扭矩遠小于最大彎矩（PL/8）。由于P型梁為閉口薄壁梁。因此其扭轉(zhuǎn)切應力遠小于彎曲正應力。所以按彎曲正應力計算極限載荷。但乘0.6的折算系數(shù)?！?.2［。］WP= ZLP型管的計算是基于閉口薄壁管的假設計算的。若為開口薄壁管（管縱向未完全焊接），則其承載能力只有計算值的1/3~1/4。tb3htbtb312tx2ox12h32?y=03ox3?yt