貨架承載力計算

1、貨架承載力計算（單位：公斤）橫梁長度10001200150018002000220023002400250026002700280030003300抱焊梁80X50X1.5264322021982180217231651158515241468141513211201100X50X1.55487365830482743249423862286219521102032195918291662100X50X2.0470639223530320830692941282327152614252123532139110X50X1.5632842193515316428762751263625312433

2、2343226021091917120X50X1.5720040003600327231303000288027692666257124002181120X50X2.051704653423040463877372235793446332331022820140X50X1.54555414039603795364435033374325330362760140X50X2.05877534351104897470245214353419839183562P型梁50X30X1.235828723821550X30X1.546537330928025424360X40X1.5150012501000

3、83375068065062560X40X2.0225018001500135012271173112580X50X1.5525042003500315028632739262525202423233380X50X2.07200580048504300395038003600350033503200110X50X2.0950080007400650060005750550052005000矩形管50X30X1.5283022601880170050X30X1.83930327026202180196050X30X2.0360028802400216060X40X1.55700475038003

4、15028502590247560X40X1.8669055804460372033403040290060X40X2.060004800400036003270313080X40X1.51236098808240741067406440618080X40X2.02808023400187201560014040127601220011700100X50X2.044640372002976024800223202029019400186001785017170165001.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(yīng)力為b,橫梁長度為L,抗彎截面模量為Wz

5、o按簡支梁承受均布載荷計算，其承載力為:p12WzL對Q235,取許用應(yīng)力為120MPa,對Q215取105MPa,XQQ195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、|QX、IQY。計算彎曲中心X0的位置Y1ylyIxyIxX02IxIyIXy假設(shè)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(yīng)力，然后按第三強(qiáng)度理論確定極限載荷。扇性慣性積的計算公式為：公式中：若bxc,hyc,則取：（b1xc0,（h1y”P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(qiáng)度、支座端計算扭轉(zhuǎn)強(qiáng)度。最大扭矩為：qlX0/2。或者：Mt=PX0/2。由于X0VVl。因此最大扭矩遠(yuǎn)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(yīng)力遠(yuǎn)小于彎曲正應(yīng)力。所以按彎曲正應(yīng)力計算極限載荷。但乘0.6的折算系數(shù)。P7.2WzP型管的計算是基于閉口薄壁管的假設(shè)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i/3i/4。Iihtb；T(h”)IitXc3ch3I2I4th；6th1b24th23i