120噸六梁橋式起重機(jī)結(jié)構(gòu)設(shè)計(jì)畢業(yè)論文-展示頁(yè)
2025-06-28 06:18本頁(yè)面
【正文】 局部壓應(yīng)力② 垂直彎矩產(chǎn)生的應(yīng)力為 ③ 水平彎矩產(chǎn)生的應(yīng)力 所以 ④ 剪力和扭矩產(chǎn)生的切應(yīng)力為 式中為主梁上翼緣板的靜矩 所以，切應(yīng)力1點(diǎn)的折算應(yīng)力為2點(diǎn)的應(yīng)力 3點(diǎn)的應(yīng)力付主梁跨端的切應(yīng)力⑤ 主腹板其中所以⑥ 翼緣板承受水平剪切力合格根據(jù)工作級(jí)別為，驗(yàn)算小車位于跨中時(shí)，跨中位置處的疲勞強(qiáng)度該截面的最小彎矩為空載小車在右端極限位置處，如圖此時(shí)①驗(yàn)算4點(diǎn)的疲勞強(qiáng)度根據(jù)工作級(jí)別和材料選擇集中等級(jí)所以⑦ 演算橫隔板下端焊縫與主腹板的連接處5的疲勞強(qiáng)度根據(jù)工作級(jí)別和材料選擇集中等級(jí)和，可得當(dāng)小車滿載位于跨中時(shí)水平慣性位移 垂直動(dòng)剛度的計(jì)算付主梁質(zhì)量起升鋼絲繩滑輪組靜伸長(zhǎng)起重機(jī)水平動(dòng)剛度以物品高位懸掛，滿載小車位于橋架跨中的水平振頻率來(lái)表征半橋架的換算質(zhì)量半個(gè)橋架在單位水平力作用下產(chǎn)生的水平位移為 １、 翼緣板 翼緣板最大外伸部分２、 主腹板 ３、 副腹板 由主主梁的驗(yàn)算可知副腹板比主腹板更危險(xiǎn)，則可以只驗(yàn)算副腹板驗(yàn)算副腹板區(qū)格Ⅰ的穩(wěn)定性，區(qū)格兩邊正應(yīng)力為區(qū)格Ⅰ的歐拉應(yīng)力為區(qū)格Ⅰ只受的作用其中屬于不均勻壓縮板需修正復(fù)合應(yīng)力橫隔板采用8mm厚的鋼板，周圍預(yù)留160mm，用8mm厚80mm寬的鋼板鑲邊縱向加勁肋采用的角鋼，縱向加勁肋到腹板中心線的如圖（包括主、付主梁）橋架跨中央的標(biāo)準(zhǔn)拱度為在跨度兩邊按拋物線設(shè)置如圖第五章 端梁計(jì)算端梁截面已經(jīng)初步選定，現(xiàn)進(jìn)行具體計(jì)算端梁計(jì)算工況取滿載小車位于跨端，大小車同時(shí)起制動(dòng)及橋架偏斜 （主主梁部分端梁的截面） （付主梁部分端梁的截面）（1） 垂直載荷主梁最大支承力為,因作用點(diǎn)的變動(dòng)引起的附加力矩引起的彎局為剪力(2)水平載荷作用點(diǎn)外移引起的附加水平力矩為 主主梁部分的端梁強(qiáng)度校核合格彎局剪力為 付主梁部分的端梁強(qiáng)度校核合格 參考文獻(xiàn)：[1]：機(jī)械工業(yè)出版社[2]：[3]：[4][5][6]徐格寧、[7]倪慶興、[8][9][10]楊長(zhǎng)睽、致謝通過(guò)這次畢業(yè)設(shè)計(jì)，鞏固了以前學(xué)過(guò)的結(jié)構(gòu)和力學(xué)方面的知識(shí)，學(xué)到了很多書本上沒(méi)有的知識(shí)，對(duì)橋式起重機(jī)金屬結(jié)構(gòu)的設(shè)計(jì)過(guò)程和方法有了一定的了解，為以后的工作打下了良好的基礎(chǔ)。在此向他們表示崇高的敬意和感謝！由于是第一次做這么大的設(shè)計(jì)，自己的知識(shí)、經(jīng)驗(yàn)都很欠缺，在設(shè)計(jì)過(guò)程中出現(xiàn)了很多不足之處，請(qǐng)各位老師批評(píng)！ 張明明 2007年6月18日The scientific of MechanicsThe branch of scientific analysis which deals with motions,time ,and forces is called mechabics and is made up of two parts, statics and dynamics. Statics deals with the analysis of stationarys systerms,.,those in which time is not a factor,and dynamics deals with systerms which change with time .As shown jin ,dynamics is also made up of two major disciplines,first recgnized as separate entities by Euler in 1775.The investigation of the motion of a rigie body may be convenientnly separated into two parts,the one gemetical , the other mechanical .In the first part, the transference of the body from a given position to any other position must be investigated without respect to the cause of the motion , and must be represented by analytical formulae, which will define the position of the investigation will therefore be referable solely to geometry ,or rather to stereotomy.It is clear that by the separation of this part of the question from the other,which belongs properlywo Mechanics, the determination of the motion from dynamical principles will be made much easier than if the two parts were undertaken conjointly.These two aspects of dynamics were later recgnized as the distinct sciences of kinematics and kinetics ,and deal with motion and the forces producing it ,respectively.The initial problem in the design of a mechannical systerm is therefore understanding its kinenatics. Kinematics is the study of motiom,quite apart from the forces which produce that motion. More particularly,kinematics is the study of position , displacement, totation, speed, velocity ,and study ,say,of planetary or orbital motion is also a problem in kinematics.It should be carefully noted jin the above quotation that Euler based his seperation of dynamics into kinematics and kinetics on the assunption that they should deal with rigid bodies. It is th
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