截面幾何性質(zhì)

第六章截面幾何性質(zhì)6.1預(yù)備知識(shí)一、基本概念1、組合截面慣性矩的計(jì)算工程中常遇到組合截面，這些組合截面有的是由幾個(gè)簡(jiǎn)單圖形組成（圖a、b、c），有的是由幾個(gè)型鋼截面組成（圖d）。在計(jì)算組合截面對(duì)某軸的慣性矩時(shí)，根據(jù)慣性矩的定義，可分別計(jì)算各組成部分對(duì)該軸的慣性矩，然后再相加。(b)(b)(c)(d)(a)沫莊授原在耐計(jì)育算品組遞合起截所面及的削形彎心親主苗慣企性絨矩暮時(shí)雕，躺應(yīng)泥首團(tuán)先姻確搞定班形覽心刮的杰位舊置過，愛然董后段過催形漠心兩選店擇璃一秩對(duì)壩便畢于盤計(jì)談算鼓慣濾性首矩熊和購(gòu)慣孔性鐵積單的祝坐問標(biāo)約軸允并阿算性出旦組鬼合歸截笑面倍對(duì)侄這堅(jiān)對(duì)求軸嘉的魔慣柱性舅矩狐和葬慣箱性研積傷，兆通嘗過巷式遵（精6扔—墾1鞠6墨）草、季（楚6著—科1壟7惠）愛便?？删Υ_東定的形納心那主寺軸釋的游位頓置選和肯算刃出隊(duì)截?cái)R面注對(duì)睡形聾心淚主仗軸仆的別慣偵性舌矩鐮。停二剃、角重酸點(diǎn)爐與累難旨點(diǎn)顯1耀、斤2稼、閣3層、質(zhì)三塞、劫解叔題票方醫(yī)法冰要驢點(diǎn)蒜6妹.絨2郵典趁型藝題供解迫一朵、餐計(jì)丈算懂題仰阿構(gòu)乏甲求毅圖勉中仇截美面造的疾形汽心壤主都慣告性醫(yī)矩剪。0.2m0.2m0.4m0.12m0.6mycCCICIIIy0z0摸解良：索此刊題雀在宰例嗽6軋—棒1嗽中睡已螺求戰(zhàn)出不形榆心半位銀置劇為座授喂不角柳呈塔須過溉形企心嘗的各主磨軸鑒z亦0示、俗y金0你如徹圖伍6用—帝1捆0順?biāo)钍緷?jì)。捐勢(shì)z熔0趕軸春到移兩漢個(gè)鏟矩湊形否形鎖心姥的仗距狠離舟分蛛別餅為苦賣言毒施例儲(chǔ)饑鬧僻覺場(chǎng)窗娃各努危就噸乞眼翻屠味祝鳳拜欣彩虎效正堡優(yōu)亂蘇抗納門她綁截艙面槽對(duì)能z送0菜軸攏的虛慣戶性蔽矩列為汗兩瞞個(gè)倆矩西形壯面犁積儲(chǔ)對(duì)織街掘軸培的握慣友性臭矩奸之臥和旗，返即濁劣約乏祥博腳怕歸訊炮糾析截衫面頂對(duì)潮y把0聽軸假的菠慣夫性感矩鋼為陶燒傾二艷、沙計(jì)巖算尾題彩降賠求魔圖初所游示撈箱斧形警截糕面嫌對(duì)羨其岸對(duì)甚稱遲軸粗z拘的快慣起性芒矩嗎I帥z趟。BBbHhCyz箱形截面餅匆睛解遙：秒可虎將疤箱霧形濤看擁作象由袋大辨矩忍形味減獨(dú)去秒小錢矩欺形增組燃合和而湊成評(píng)，詠大受、擊小體矩偵形刃都剛關(guān)份于亞z笛軸銳對(duì)設(shè)稱爽，麗所浪以駐注章泉惰忙渠氏蔬界釋翁耕室麥魔貌得洞程撫泛旨云漿屆省三腥、鏟計(jì)望算很題垂闊曲試?yán)ㄇ缶韴D仍中分所夫示隱截池面獅圖燃形欣對(duì)留形衡心掩軸府的鉤慣期性蹤矩?cái)[。606010030zzczc1zc2ycc肉加濤解霞：現(xiàn)畝勒此岸圖拒形私為呼矩彼形劃截輔面太中吊挖達(dá)去槽—擁圓役形旱截浸面委，果計(jì)言算匆時(shí)來可慶把地圓鑼形稿看賀成作負(fù)魯?shù)奶勖嫘U積勒。盡c豪點(diǎn)除為往圖澤形宵的福形沒心趕，處選驢y鉗c賴，洞z遙軸方為顯參史考雅坐慢標(biāo)臥軸妄，吵由糞于去y攪c愚為華組煩合蕉圖勵(lì)形義的槳對(duì)丸稱談?shì)S窩，貨所蓋以抱有挖縱。梅z柏c奮1古軸噸和漠z謊c鞏2紀(jì)扶軸幻分消別歪過虛矩酬形攪和貌圓絲形竟的訓(xùn)形貢心繳，區(qū)且括和斧塌z綠溝軸門平體行推。丈由派組腐合證圖虧形石的駕形蓋心浙計(jì)貌算貸公找式體得進(jìn)利銜用限矩叫形成截頌面監(jiān)和油圓罰形天截猴面六對(duì)激各律自每形晨心快軸辜的箱慣鑰性綢矩冤計(jì)睜算異式錯(cuò)，掏并漆由蛙平突行巴移糕軸勞公奴式創(chuàng)得紐6必.鼻3林公練恐習(xí)講題聲一遲、英概捐念址題勞1下、抗是出非察判鏡斷激題部（亮1工）距掙陣電圖榨形哀對(duì)浸某細(xì)一追軸踐的養(yǎng)靜售矩泡為憂零縮，頓則巖該掙軸聚必嘉定捉通要過燃圖博形最的誤形納心羽。匠（捆囑爐對(duì)隊(duì)興俘凍）糕（嬌2蹦）羊采貧平渣行臭移千軸古公龜式變表起示宿圖濟(jì)形埋對(duì)銀于胳任敞意襖兩常個(gè)節(jié)相任互罪平枕行蔥軸扶的范慣戀性涼矩揉和陽慣車性炊積帝之吳間灑的渾關(guān)支系謹(jǐn)。民（醒具錯(cuò)貨）丸（餓3眼）算準(zhǔn)湖圖堤形啄在墨任脾一廟點(diǎn)遼只珠有肝一灶對(duì)壩主綢慣亦性護(hù)軸順。召（絕城塵錯(cuò)押途區(qū)）鍋（毒4飼）糠導(dǎo)擾嫂有止一忠定瞧面刪積坐的虜圖盤形鼓對(duì)膽任壩一轉(zhuǎn)軸亂的隸軸勺慣角性鋼矩顯必酸不娘為丘零峰。鼠（遷底對(duì)猴侮）帥（漿5倍）隨迷里狼圖諷形施對(duì)檔過鋒某柱一牽點(diǎn)丹的葉主膜軸思的跳慣屠性塌矩噴為泳圖孩形杠對(duì)悅過墻該緣點(diǎn)衫所詳有炭軸急的灶慣鞋性陡矩縫中疾的粉極較值異。犧（跨天然對(duì)屑稱費(fèi)）崖2爽、統(tǒng)填只空銳題匪（捕1砌）寧咐超冰組設(shè)合揭圖螺形苗對(duì)榨某特一滾軸乳的錢靜惑矩芬等箭于膀（胃看各叫組蒜成柔圖敏形圣對(duì)抽同搏一夫軸花靜宗矩扛采腹）煎的樣代器數(shù)振和伸（沖2攻）沖低搖殃圖烏形蜻對(duì)獎(jiǎng)任飼意蕩一明對(duì)頃正劣交寬軸別的殲慣只性歡矩裁之糟和怨，凝恒宇等刺于情圖博形嘆對(duì)殊（盤抗兩北軸譽(yù)交站點(diǎn)弄的魚極氧慣熟性討矩厘孟）巡(放3奇)欄碧洲枕撥圖庸形娃對(duì)卡于蹄若融干巖相正互豬平析行綢軸丸的目慣觸性忌矩岡中懇，壽其蠻中息數(shù)神值證最示小貓的易是腳對(duì)夫（作涉距挨形戶心哪最榴近刃的馬油寫）壯軸皂的民慣富性野矩障(綠4志)狀設(shè)語巴樂如席果幸一深對(duì)歌下嘆正麥交熟軸擇中冰有辛一寇根勿是煌圖校形嫂的您對(duì)停稱塞軸滴，芒則寧這可一很對(duì)引軸判為折圖延形膛（奴主貼慣儲(chǔ)性洽軸溫）替(票5械)唯灣呼窯過球圖央形倆的拴形崖心變且去（億貫圖亦形縱對(duì)制其再慣飄性露積棍等納于濃零森棍）驅(qū)的筑一便對(duì)蓋軸興為逢圖閘形她的胳形響心鹽主榜慣基性吐軸糞3山、猜選故擇鍋題吳（漸1顆）小在倍圖乏形飽對(duì)賊于拆其義對(duì)瞞稱琴軸持的遵（浪繩A卵硬禽）智炸賢腎善筒編極職A視替擦靜濁矩蜓為逢零占，益慣抹性嚴(yán)矩手不著為鴿零拐引畏斗貍晴抗秤轉(zhuǎn)陸脊B預(yù)嚇求靜另矩透和裝慣播性弦矩姻均而為潑零穩(wěn)C腎券暮靜雅矩睜不執(zhí)為報(bào)零牌，縮慣螺性蠅矩膜為恢零消早奇哨川糊脈悠腫筋瀉D儀燈妥靜碎矩憑和杰慣育性奏矩介均際不教為槍零性（科2尿）品蟲站直怠徑變?yōu)橹蝑狠的圣圓斑形互對(duì)設(shè)其面形籮心奔軸膚的抽慣樂性厚半襯徑庫i坡=蓮（笛扇陜C證預(yù)技）猶。腦銀約斤春寺泊盜溉A境褲碗饒d銷/印2梨祖傾廣脂田陸參大棉不鳥趕元碌濾皂聾傳價(jià)拐戒帶概呼族群停罵載B畜蚊囑熄d蟻/酷3純苗敢醫(yī)輝止滴C趟猜體竿d違/撕4埋士屑符遺斷夏磨華沃屯蹈肅曾競(jìng)昆把重謹(jǐn)呀轟議禽誠(chéng)烏珠墓逝墓釣D標(biāo)丹沿扒d認(rèn)/甲8竿（豆3泡）見卷洋圖艇示混截枝面堪圖幼形繳對(duì)罩形纖心合軸叉z肅的拳慣把性掛矩飯I鑰z唯=邪（宅擱層C摘誕蒸狀）乞。DDdz痕礙蹦冒獵年委綢仔A陪送獄遙題巧姜仙趴硬即頃耕劑蒼付蚊鄭馳想偵敵耳當(dāng)臘B晨注束透睡困灣C鳥棄熔鴨逢遮慚礦慰蟲膏吵蘭宇兵轉(zhuǎn)寫難將桂陪事暑淚補(bǔ)D泉券林（慨4呈）貿(mào)覽梢圖霧示戰(zhàn)1擦/閥4夫圓抬截遇面塞，谷c哲點(diǎn)渴為幸形話心灣，側(cè)則供狗（并社甘A秒景撒羨）潔。zzoy1yz1c狂第擊墓蝕左A璃鉗捏豆y思1遮，吸z僵1苗是泄主脈慣說性攪軸貓，牛而險(xiǎn)y譜，椅z曬不景是貌貴屬山找沙軋廁B頑美按造y決，遇z壘是迫主槽慣惠性編軸榆，逮而附y(tǒng)吳1姐，牌z齡1勸不旅是氏電坐負(fù)狗治C調(diào)安樣蠶兩禽對(duì)盛軸遙都魔是華主分慣這性報(bào)軸袋粘悶搞盞辰春籃鋤師盡啊諷仆市留無童或D凈謠正佛兩蝴對(duì)依軸款都檔不智是涌主期慣撈性燥軸車（鹿5吼）租輔夢(mèng)直激角單三鍋角賤形慰如低圖格所變示顯，與A也點(diǎn)途為搶斜鄭邊添的扎中襪點(diǎn)窮，母則倘（轉(zhuǎn)美娛疫階）態(tài)為侄圖堵形潛的降一最對(duì)誰主養(yǎng)慣專性隨軸錫。暈縣旺浪立走皮枯森歪稼帽微般皂森古A爆巡稅其其y缸1橫，兵z粒1平測(cè)攀鮮仆須遭浩憲狂銅銅僑出甩都醉雄濤煤鏈昌成B扎宗蹄計(jì)y擱1未，當(dāng)z將2撲物貴幸違害C寇株書潤(rùn)踩y歌2脫，圍z致1蚊疼蓬話恒吊蓮客發(fā)琴榴山膀競(jìng)彼群閑園息遲盛效末D棄罷車賤y遮2費(fèi)，攜z波2zz1y1y2z2A任二伶、仿計(jì)魯算廁題坡意1訂、匯手求孟圖錄所州示選各杰圖尚形巾中粘陰兼影掏部?jī)煞智鼘?duì)亡z得軸紗的尊靜壇矩伐。0.40.4hhbzzbttt2thHBzbh/2(a)(b)(c)攏答吩案拌：億2雜、逗榜費(fèi)求速圖坡所螺示視圖忘形橡的演形捉心轉(zhuǎn)位莊置巴。101010(a)(b)(c)(d)200501506014060zO16040z160zO[18aRzyy折答肚案仍：端3盒、確躍求奶圖像所足示題截沫面巴對(duì)很z辭、身y穴軸乒的揚(yáng)慣放性顆矩啞和作慣圍性略積煩。OORzy慮答血案肯：餓4狠、選史括求船圖紐所揚(yáng)示裝各恨圖浙形暖對(duì)榨z等、鉛y暈軸訊的認(rèn)慣摸性今矩敲和革慣胞性鑒積y40y40401010OOOezzzhhyybb(a)(b)(c)鮮答吉案舞：帖5偵、坐則垃圖殃所京示點(diǎn)矩討形斃，牲在笛左中右據(jù)兩債側(cè)紡切針去濾兩豈個(gè)燒半晃圓躁形艇（歌）灣。絹試堵求重切蜻去鍛部小分箏的壤面彼積饒與偏原爹面健積曬的箱百殺分威比尸和其慣師性噴矩相I廟z蠻、波I隊(duì)y報(bào)比通原腥來風(fēng)減跪少印了韻百摟分賺之姓幾駱。bbdyzbCh幕答新案剝：饞6寧、武牧聾試稍求瘡圖蓄所女示勝各塊圖稻形蔥的笨形范心卸位而置均。200mm200mm200mm600mm120mmCCCyyy120mm400mm400mmycxc120mm120mm(a)(b)(c)ycOx100mmx柔答把案屬：貓頂（認(rèn)a養(yǎng)）仗y鼓c御=牲2吵8習(xí)0疫.斑6鮮m受m允損凍(限b皇)材貝y責(zé)c智=染－秘1攔6洋.鄰7醋m椒m般潤(rùn)暗(鈴c禾)失坐y謎c我=薄1判3臘3刑.堵9宋7謀m膀m戀挖煙；推y虜c扯=包1蕩7儲(chǔ)9泳.抱5應(yīng)m奇m講7桃、鈔蟻仙試兩求捷圖挪所威示洽各錢平夸面尼圖繡形眼關(guān)太于菠形蟻心童軸省的鳳慣廈矩賠I鑒x謎和劃慣唉積犯I亦x桶y濾脖。100mm100mm80mm60mm20mm100mm140mm20mm20mm20mmCCyyx(a)(b)弟答錦案跪：迫襲（熊a巾）幟從傭受提匙挑(吊b斑)艙拌誕8吐、傅市樸試首求介圖桌所孝示貪各凍圖氏形牧關(guān)宗于豬χ豆軸敗的扛慣隸矩邊I舟x藝啟。(a)R(a)RR/2R/4yxy(b)xOdbh結(jié)答農(nóng)案孕：介（蹄a靈）理；隨仙柿佳（罰b虎）主9遍、挺影濤圖賴所梯示辭截碧面變系屋由鞭一色個(gè)丘長(zhǎng)退為巾l肉的捆正悔方論形價(jià)挖大去飽一矛個(gè)欠邊蝦長(zhǎng)卵為家l烏/脆2答的峰正嶼方祝形騾，在試搬求斜該寫截卻面綿關(guān)鐘于換x蝶軸雹的年慣資性么矩蓮I姿x觸云。yl/2l/2l/2450拌答捏案艷：寄I汁x華=望0釀。點(diǎn)0伴7yl/2l/2l/2450叔1臟0津、像嶺睜試嗎求逐圖灘所陡示陷型乎鋼就組注合僻截全面偶的詳形訂心休主委軸攜及桐形登心捎主洗慣蠶矩鹽。怠答構(gòu)案善：喊（像a亡）糾(譯b場(chǎng))120mm120mm20mm角鋼90mm90mm槽鋼14b槽鋼18(a)(b)附1悶1輔、撞幫常圖魯示冤為箏由悠兩蜂個(gè)驗(yàn)1開8通a豆號(hào)奔槽撿鋼鏈組伴成店的涌組災(zāi)合旦截唱面患，民如愧欲氧使命此破截兵面鄰對(duì)明兩很個(gè)醉對(duì)縱稱堆由眾的禁慣隸性麻矩調(diào)相門等歸，個(gè)問枝兩抬根題槽張鋼冠的確間漠距籌應(yīng)收為圍多估少轎？貪zzOya筍答寒案粒：量1乞2維、娘匠棉在銅圖聯(lián)示惱的兔對(duì)球稱哈截畝面滅中述，顧求認(rèn)截優(yōu)面構(gòu)對(duì)及形您心霸主尿軸艦z抓0臺(tái)的菊慣華性孫矩資。CCaaahyczob2b1姻答榴案穗：湊1囑3幻、肅變悔圖稻示樣為粉工泡字社鋼唇與譯鋼斗板描組懲成稅的航組球合袋截洪面乒，抄已腿知獄工森字令鋼減的紅型宏號(hào)楚為憲4糕0嫁a革，該鋼立板卻的傷厚兵度太，遠(yuǎn)求巖組賢合爬截冠面鈔對(duì)悟形甩心償主恥軸方z賠0絨軸竊的妄慣往性自矩益。zz0低答挨案高：店1著4辛、性染耽試納求絹下紀(jì)列成各鈔截切面晨的耕形帖心彎位汽置軍。100mm100mm50mm150mmccayzhyzO(a)(b)值答瓶案蕩：噸（兔a氧）糧承秀羨代服（春b援）塞1建5贊、像饑價(jià)圖企示棋T朝形錫截燙面翠，青已芝知唇h煌/涼b族=弓6湯。五試板求均截葵