透水框架結(jié)構(gòu)設(shè)計(jì)與優(yōu)化

題 關(guān)鍵詞 參賽隊(duì)號(hào):所選題目:A題“Revetmentfloodscoursurroundedsixsidesofpermeableframe”isanewuseofpatentwhichisownedbytheNorthwestWaterConservancyScienceInstandiswidelyused.Butintheprocessofusingtheframework,itmaybeimpactedbywaterandberolledorshifted.Sotheframeworkcannotachievetheidealeffectwhenbepiledingroup.Aimingattheproblemabove，wemodifydesignstructure’sinsufficientandchangetheactualunreasonablepackingwayinthisarticle.Wedesignanewtypeofpermeableframenamed“hollowcuttingAngleofcubepermeableframe”.Onthepremiseofsatisfyingtherequirementsofflood,theframeworkisbetterthan“Revetmentfloodscoursurroundedsixsidesofpermeableframe”inaspectssuchasstructurestrengthandhookedInthispaper,wefirstlyusingmechanismanalysistoget actualframeworkisabstractedasphysicalexperimentmodel.BasedonDarcy-WeisbachFormula,GeometricGaussiandistributionsimilarily,Manningformulaandsoonwecalculateoutaoptimalsizeofapplicableframework.Secondly,“hollowcuttingAngleofcubepermeableframe”isevaluatedfromvariousanglesbycombiningthetheoryofengineeringmechanicsandwavespectrum.Intheprocessofmodeltesting,wefindoutthedecelerationrateofwaterwhenusingthehollowcuttingAngleofcubepermeableframethrougha2-Dflowmathematicalmodel,.Thecalculationresultshowsthattheframeworkhassimilarpermeabilityeffectasthesixsidesofpermeableframewhichispractical.Finally,intheprocessofthemodificationandimprovement,wefirstlychangetheframebarcross-sectionshapeintoatriangle,whichgreatlyimprovethestructuralstrengthofframe,throughthecalculationofthesecondaxialmomentofarea.Secondly,weincreasethesicklehookcomponentintheconnectedvertexbox,whichincreased theoriginalframework’sconnectiondegree. I 削角空心方塊在空氣中重量b b 設(shè)計(jì)波高 Ir 圖一削角空心透水方框立體 圖二削角空心透水方框俯視 VKVaHbAcdegfa,b,c,d,e,fN 再由物理的因次表達(dá)式可得到下面公式[H][A][g]LT2

ab2c3def ae2f debfe d 1e2 fe2c

KV( )e(Hg)f(A) 1VH1 1VH1

1 替水深H。則雷諾數(shù)和佛汝德數(shù)可以表示為RV1H,F

V2KReFf(A) VHe VH1V2f(R

e,Fr

H2

1-f(R,Fr AH

u 其中C1R16，并且不考慮槽壁阻力，所以謝才公式公式（13）n4u2H3 iFCd i控制體水流中受到的重力GG fFGF CAu2 d定義方框拋投密度 Ai,并且令C'C，所 C' u

hfLu JhL

1hf Lu18

u2

C'1 RKKaaRRH，所以aa aHd面的邊長(zhǎng)。所以阻力系數(shù)C'd

HC'

f(a

Cf(a

Cd 因?yàn)樽枇ο禂?shù)Cd是無(wú)因次數(shù)，所以在原型和模型中應(yīng)保持一致，根據(jù)幾何正態(tài)相

而試驗(yàn)的幾何比尺是H60,由公式(27)

f n2f(H) u1R23J1n

u1H23i1n nH23i1u

表2不同水深下的n nH1p H1pH

n2 圖 H

n2 所 H

H1n2g0.02630.0052exp(5.722H1H

Cdn Cv1V2d

n2 框架高度a，Hab（b為削角空心方框每個(gè)側(cè)面的邊長(zhǎng) H

2.8H21 削角空心方框的側(cè)面邊長(zhǎng)約為W

bKD(S1)3S W該式中給出的削角空心框架穩(wěn)定重量 框架失穩(wěn)率與擊岸波相似參數(shù)及平均波周期T擊岸波相似參數(shù)（即Iribarren數(shù) tannN

率與波周期及擊岸波相似參數(shù)的關(guān)系圖，分析得失穩(wěn)率n隨著擊岸波相似參數(shù)的增大先增大后減小，某一n值對(duì)應(yīng)的值最大。因擊岸參數(shù)與波周期成正比變化，所以失符合一定的分布規(guī)律的，見圖從圖6可以看出，在f=0附近，S（f）很小，隨著f增大，K=HJ 其中

3～5．5、Iribarren數(shù)I=2．5～4 0.49I K r ,Ir r I2r由WlnmpeyWalling—ford水工研究所n

6a'3

a a'1 Ba量系數(shù)

1b截面二次軸矩（secondaxialmomentofarea），又稱截面慣量，或截面對(duì)某一軸的慣性矩，是反映截面的形狀與尺寸對(duì)彎曲變形影響