鋼結(jié)構(gòu)國(guó)內(nèi)外鋼性能比較

1、，、國(guó)內(nèi)外建筑用鋼的鋼號(hào)及相關(guān)性能的比較:鋼號(hào)鋼號(hào)性能對(duì)照表鋼號(hào)中國(guó)前蘇聯(lián)美國(guó)GBrocTASTM08F08 k n1006優(yōu)0808100810F101010101010,1012質(zhì)151510152020102025251025碳303010303535103540401040素4545104550501050結(jié)555510556060106015Mn15r1016,1115構(gòu)20Mn20 r1021,102230Mn30 r1030,103340Mn40 r1036,1040鋼45Mn45 r1043,104550Mn50 r1050,1052”0Mn2恤21320,13211(30Mn

2、2|30r 21330英國(guó)|日本法國(guó)德國(guó)BSJISNFDIN040A04S09CKC10045M10S9CKC10040A10XC10045M10S10CXC10C10,CK10095M15S15CXC12C15,CK15050A20S20CXC18C22,CK22S25CCK25060A30S30CXC32060A35S35CXC38TSC35,CK35080A40S40CXC38H1080M46S45CXC45C45,CK45060A52S50CXC48TSCK53070M55S55CXC55080A62S58CXC55C60,CK60080A17SB46XC1214Mn4080A20XC

3、18080A32S30C|XC32080A40S40C40M540Mn4080A47S45C030A52S53CXC48080M50|150M19|sMn420|20Mn5|150M28|sMn433H|32M5|30Mn5|作業(yè)二.1 影響疲勞強(qiáng)度的因素有：應(yīng)力集中和應(yīng)力循環(huán)次數(shù)（最大應(yīng)力，應(yīng)力比，循環(huán)次數(shù)和缺口 效應(yīng)），還有結(jié)構(gòu)和構(gòu)件中的殘余應(yīng)力以及結(jié)構(gòu)和構(gòu)件所處的環(huán)境等都 會(huì)對(duì)其疲勞強(qiáng)度有影響。在有腐蝕性介質(zhì)的環(huán)境中，疲勞裂紋擴(kuò)展的 速率會(huì)受到不利的影響2提高疲勞性能做法：1）焊接時(shí)連續(xù)施焊避免出現(xiàn)繞角引起應(yīng)力集中。 2）在構(gòu)件的拐點(diǎn) 即危險(xiǎn)點(diǎn)處因做成光滑的或是焊接其他構(gòu)件以此加強(qiáng)。3）

4、采用拼接板時(shí)因使用截面形狀光滑的避免出現(xiàn)應(yīng)力集中。4）提高表面光潔度，表面加工對(duì)疲勞強(qiáng)度的影響，與零、構(gòu)件經(jīng)加工后表層中的微觀缺陷及 金屬狀態(tài)有關(guān)。表面光潔度越差，疲勞強(qiáng)度的降低也越嚴(yán)重。如果提 高表面光潔度，消除缺陷，則能使疲勞強(qiáng)度大大增加 另外，刀具切削痕跡的方向有時(shí)對(duì)疲勞強(qiáng)度的影響也十分顯著。在制訂工藝規(guī)程時(shí)最 好使零、構(gòu)件表面刀痕跡與作用于其上的拉應(yīng)力方向平行，這樣做可 防止疲勞裂紋過早地發(fā)生。作業(yè)三.1解：根據(jù)公式：V二F, T=F(e i+e2)角焊縫群上任一點(diǎn)的應(yīng)力方向垂直與該點(diǎn)與形心的連線，通過n Ayi(x)y (x)=土計(jì)算形心點(diǎn)得位置如圖 0點(diǎn)，可計(jì)算出1,4點(diǎn)得位置送A

5、i =1離o點(diǎn)R值最大，又因?yàn)閼?yīng)力大小與連線的長(zhǎng)度 R成正比，故由扭矩 引起的剪應(yīng)力最大，剪力引起的剪應(yīng)力是均勻分布的，因此1點(diǎn)和4點(diǎn)為最危險(xiǎn)點(diǎn)。Ip在扭轉(zhuǎn)T的作用下： t =匸丄Ip二lx Ty由剪力V在焊縫群起的剪力按均勻分布：F；vy -Z hetw2畫出半剛性連接的構(gòu)造示意圖:Whe n you are old and grey and full of sleep,And no ddi ng by the fire, take dow n this book,And slowly read, and dream of the soft lookYour eyes had once, a

6、nd of their shadows deep;How many loved your mome nts of glad grace,And loved your beauty with love false or true,But one man loved the pilgrim soul in you,And loved the sorrows of your cha nging face;And bending dow n beside the glow ing bars,Murmur, a little sadly, how love fledAnd paced upon the

7、mountains overheadAnd hid his face amid a crowd of stars.The furthest dista nee in the worldIs not betwee n life and deathBut whe n I sta nd in front of youYet you dont know thatI love you.The furthest dista nee in the worldIs not whe n I sta nd in front of youYet you cant see my loveBut whe n un doubtedly knowing the love from bothYet cannot be together.The furthest dista nee in the worldIs not being apart while being in loveBut whe n I pla inly cannot resist the year ningYet prete nding you have n ever bee n in my heart.The furthest dista nee in the worldIs