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目次
1總則······························································································1
2術(shù)語(yǔ)和符號(hào)··················································································2
2.1術(shù)語(yǔ)····························································································2
2.2符號(hào)····························································································2
3材料································································································5
3.1一般規(guī)定·····················································································5
3.2鋼材化學(xué)成分和設(shè)計(jì)指標(biāo)····························································8
3.3耐候鋼······················································································15
4熱軋型鋼······················································································18
4.1熱軋H型鋼··············································································18
4.2熱軋無(wú)縫鋼管············································································19
5冷彎空心型鋼··············································································23
5.1冷彎矩形、方形空心型鋼··························································23
5.2冷彎圓形空心型鋼·····································································27
6焊接空心型鋼··············································································30
6.1分類代號(hào)···················································································30
6.2焊接矩形空心型鋼·····································································30
6.3焊接異形空心型鋼·····································································35
附錄A計(jì)算截面特性的公式························································44
本標(biāo)準(zhǔn)用詞說(shuō)明················································································46
引用標(biāo)準(zhǔn)名錄····················································································47
附:條文說(shuō)明····················································································48
Contents
1GeneralProvisions·········································································1
2TermsandSymbols·······································································2
2.1Terms························································································2
2.2Symbols·····················································································2
3Materials·························································································5
3.1General······················································································5
3.2SteelDesignationsandDesignStrength······································8
3.3AtmosphericCorrosionResistingSteel······································15
4HotRolledSectionSteel···························································18
4.1Hot-rolledHSectionSteel·······················································18
4.2Hot-rolledSteelTube······························································19
5ColdFormingHollowSectionalSteel···································23
5.1ColdFormingHollowRectangularandSquare
SectionalSteel·········································································23
5.2ColdFormingHollowSteelTube···········································27
6WeldedHollowSectionalSteel·················································30
6.1ClassificationandCode····························································30
6.2WeldedHollowRectangularSectionalSteel······························30
6.3WeldedSpecial-shapedSteelPipes············································35
AppendixAFormulaforCalculatingCross-sectional
Characteristics····································································44
ExplanationofWordinginThisStandard·····································46
ListofQuotedStandards·································································47
Addition:ExplanationofProvisions··············································48
1總則
1.0.1為了促進(jìn)河北省鋼結(jié)構(gòu)工業(yè)化、標(biāo)準(zhǔn)化發(fā)展,推進(jìn)裝配式
建筑的發(fā)展,積極推進(jìn)我省鋼結(jié)構(gòu)建筑的現(xiàn)代化,提升鋼結(jié)構(gòu)技
術(shù)集成配套,節(jié)約資源,保護(hù)環(huán)境,制定本標(biāo)準(zhǔn)。
1.0.2本標(biāo)準(zhǔn)規(guī)定了建筑用鋼型材的材料要求、截面尺寸,以及
訂貨、偏差控制等。本標(biāo)準(zhǔn)適用于建筑結(jié)構(gòu)用的熱軋型鋼、冷彎
空心型鋼、焊接空心型鋼的工廠生產(chǎn)和設(shè)計(jì)選用。
1.0.3建筑用鋼型材的工廠生產(chǎn)和設(shè)計(jì)選用除應(yīng)符合本標(biāo)準(zhǔn)外,
尚應(yīng)符合國(guó)家和河北省現(xiàn)行有關(guān)標(biāo)準(zhǔn)的規(guī)定。
1
2術(shù)語(yǔ)和符號(hào)
2.1術(shù)語(yǔ)
2.1.1建筑用鋼型材steelextrudateforbuildings
在房屋建筑中使用的,通過(guò)軋制、冷彎、焊接等工藝制成的
具有一定幾何形狀的鋼構(gòu)件。
2.1.2熱軋型鋼hotrolledsectionsteel
用加熱鋼坯軋成的各種幾何斷面形狀的鋼材,本標(biāo)準(zhǔn)中分為
熱軋H型鋼和熱軋無(wú)縫鋼管。
2.1.3冷彎空心型鋼coldforminghollowsectionalsteel
用鋼板或鋼帶在連續(xù)輥式冷彎?rùn)C(jī)組上生產(chǎn)成型,再焊接接縫
而成的空心型鋼,本標(biāo)準(zhǔn)中分為圓形、矩形和方形等冷彎空心型
鋼。
2.1.4焊接空心型鋼theweldedhollowsectionalsteel
用鋼板或鋼管焊接而成的空心型鋼,本標(biāo)準(zhǔn)中分為矩形(含
方形)、日字形、田字形、L形、T形、十字形等空心型鋼。
2.1.5耐候鋼atmosphericcorrosionresistingsteel
通過(guò)添加少量的合金元素如Cu、P、Cr、Ni等,使其在金屬
基體表面上形成保護(hù)層,以提高耐大氣腐蝕性能的鋼。
2.2符號(hào)
2.2.1熱軋型鋼的幾何參數(shù)
2
H1——H型鋼截面高度;
B1——H型鋼截面寬度;
tw——H型鋼腹板厚度;
tf——H型鋼翼緣厚度;
r1——H型鋼圓角半徑;
D1——熱軋無(wú)縫鋼管的外直徑;
t1——熱軋無(wú)縫鋼管的壁厚。
2.2.2冷彎空心型鋼的幾何參數(shù)
H——冷彎矩形空心型鋼的長(zhǎng)邊尺寸;
B——冷彎矩形空心型鋼的短邊尺寸或冷彎方形空心型
鋼的邊長(zhǎng);
t——冷彎空心型鋼的壁厚;
R——冷彎矩形、方形空心型鋼的外圓弧半徑;
D——冷彎圓形空心型鋼的外直徑。
2.2.3焊接空心型鋼的幾何參數(shù)
H2——焊接矩形空心型鋼的長(zhǎng)邊尺寸;
B2——焊接矩形空心型鋼的短邊尺寸;
t2——焊接矩形空心型鋼的壁厚;
H3——焊接L形空心型鋼的單肢長(zhǎng)度;
B3——焊接L形空心型鋼的肢寬;
t3——焊接L形空心型鋼的壁厚;
3
H4——焊接T形空心型鋼的腹板高;
L4——焊接T形空心型鋼的翼緣長(zhǎng);
B4——焊接T形空心型鋼的肢寬;
t4——焊接T形空心型鋼的壁厚;
H5——焊接日字形空心型鋼的長(zhǎng)邊尺寸;
B5——焊接日字形空心型鋼的短邊尺寸;
t5——焊接日字形空心型鋼的外壁厚;
t5n——焊接日字形空心型鋼的內(nèi)壁厚;
B6——焊接田字形空心型鋼的邊長(zhǎng);
t6——焊接田字形空心型鋼的外壁厚;
t6n——焊接田字形空心型鋼的內(nèi)隔板壁厚;
H7——焊接十字形空心型鋼的單向總長(zhǎng)度;
B7——焊接十字形空心型鋼的肢寬;
t7——焊接十字形空心型鋼的壁厚。
4
3材料
3.1一般規(guī)定
3.1.1建筑用鋼型材的選用應(yīng)遵循技術(shù)可靠、經(jīng)濟(jì)合理的原則,
綜合考慮建筑結(jié)構(gòu)的重要性、荷載特征、結(jié)構(gòu)形式、應(yīng)力狀態(tài)、
連接方法、工作環(huán)境、鋼材厚度和價(jià)格等因素,選用合適的鋼材
牌號(hào)和材性保證項(xiàng)目。設(shè)計(jì)文件中應(yīng)完整地注明對(duì)鋼材的技術(shù)要
求。
3.1.2承重結(jié)構(gòu)所用的鋼材應(yīng)具有屈服強(qiáng)度、抗拉強(qiáng)度、斷后伸
長(zhǎng)率和硫、磷含量的合格保證,對(duì)焊接結(jié)構(gòu)尚應(yīng)具有碳當(dāng)量的合
格保證。焊接承重結(jié)構(gòu)以及重要的非焊接承重結(jié)構(gòu)采用的鋼材應(yīng)
具有冷彎試驗(yàn)的合格保證;對(duì)直接承受動(dòng)力荷載或需驗(yàn)算疲勞的
構(gòu)件所用鋼材尚應(yīng)具有沖擊韌性的合格保證。
3.1.3采用塑性設(shè)計(jì)的結(jié)構(gòu)及進(jìn)行彎矩調(diào)幅的構(gòu)件,所采用的鋼
材應(yīng)符合下列規(guī)定:
1屈強(qiáng)比不應(yīng)大于0.85;
2鋼材應(yīng)有明顯的屈服臺(tái)階,且伸長(zhǎng)率不應(yīng)小于20%。
3.1.4建筑用鋼型材宜采用Q235、Q345、Q355、Q390、Q420、
Q460和Q345GJ鋼,其質(zhì)量除應(yīng)符合本標(biāo)準(zhǔn)規(guī)定外,尚應(yīng)符合現(xiàn)
行國(guó)家標(biāo)準(zhǔn)《碳素結(jié)構(gòu)鋼》GB/T700、《低合金高強(qiáng)度結(jié)構(gòu)鋼》
GB/T1591、《建筑結(jié)構(gòu)用鋼板》GB/T19879和《結(jié)構(gòu)用無(wú)縫鋼
管》GB/T8162的規(guī)定。
5
3.1.5處于外露環(huán)境,且對(duì)耐腐蝕有特殊要求或處于侵蝕性介質(zhì)
環(huán)境中的承重結(jié)構(gòu),可采用Q235NH、Q355NH和Q415NH牌號(hào)
的耐候結(jié)構(gòu)鋼,其質(zhì)量應(yīng)符合現(xiàn)行國(guó)家標(biāo)準(zhǔn)《耐候結(jié)構(gòu)鋼》GB/T
4171的規(guī)定。
3.1.6高層建筑的外露承重鋼結(jié)構(gòu)可選用Q235NH、Q355NH或
Q415NH等牌號(hào)的焊接耐候鋼,其材質(zhì)和材料性能要求應(yīng)符合現(xiàn)
行國(guó)家標(biāo)準(zhǔn)《耐候結(jié)構(gòu)鋼》GB/T4171的規(guī)定,并宜附加要求保
證晶粒度不小于7級(jí),耐腐蝕指數(shù)不小于6.0。
3.1.7焊接結(jié)構(gòu)所用鋼材尚應(yīng)具有良好的焊接性能,其碳當(dāng)量或
焊接裂紋敏感性指數(shù)應(yīng)符合設(shè)計(jì)要求或相關(guān)標(biāo)準(zhǔn)的規(guī)定。
3.1.8建筑用鋼型材焊接材料的選用應(yīng)符合下列規(guī)定:
1焊條或焊絲的型號(hào)和性能應(yīng)與相應(yīng)母材的性能相適應(yīng),其
熔敷金屬的力學(xué)性能應(yīng)符合設(shè)計(jì)規(guī)定,且不應(yīng)低于相應(yīng)母材標(biāo)準(zhǔn)
的下限值。
2焊條的材質(zhì)和性能應(yīng)符合現(xiàn)行國(guó)家標(biāo)準(zhǔn)《非合金鋼及細(xì)晶
粒鋼焊條》GB/T5117、《熱強(qiáng)鋼焊條》GB/T5118的有關(guān)規(guī)定。
對(duì)直接承受動(dòng)力荷載或需要驗(yàn)算疲勞的結(jié)構(gòu),以及低溫環(huán)境下工
作的厚板結(jié)構(gòu),宜采用低氫型焊條。
3焊絲的材質(zhì)和性能應(yīng)符合現(xiàn)行國(guó)家標(biāo)準(zhǔn)《熔化焊用鋼絲》
GB/T14957、《氣體保護(hù)電弧焊用碳鋼、低合金鋼焊絲》GB/T8110、
《碳鋼藥芯焊絲》GB/T10045及《低合金鋼藥芯焊絲》GB/T17493
的有關(guān)規(guī)定。
4埋弧焊用焊絲和焊劑的材質(zhì)和性能應(yīng)符合現(xiàn)行國(guó)家標(biāo)準(zhǔn)
《埋弧焊用碳鋼焊絲和焊劑》GB/T5293、《埋弧焊用低合金鋼焊
6
絲和焊劑》GB/T12470的有關(guān)規(guī)定。
3.1.9高層民用建筑中按抗震設(shè)計(jì)的框架梁、柱和抗側(cè)力支撐等
主要抗側(cè)力構(gòu)件,其鋼材性能要求尚應(yīng)符合下列規(guī)定:
1鋼材抗拉性能應(yīng)有明顯的屈服臺(tái)階,其斷后伸長(zhǎng)率不應(yīng)小
于20%。
2鋼材屈服強(qiáng)度波動(dòng)范圍不應(yīng)大于120N/mm2,鋼材實(shí)物的
實(shí)測(cè)屈強(qiáng)比不應(yīng)大于0.85。
3抗震等級(jí)為三級(jí)及以上的高層民用建筑鋼結(jié)構(gòu),其主要抗
側(cè)力構(gòu)件所用鋼材應(yīng)具有與其工作溫度相應(yīng)的沖擊韌性合格保
證。
4偏心支撐框架中的消能梁段所用鋼材的屈服強(qiáng)度不應(yīng)大
于345N/mm2,屈強(qiáng)比不應(yīng)大于0.8;且屈服強(qiáng)度波動(dòng)范圍不應(yīng)大
于100N/mm2。
3.1.10鋼材質(zhì)量等級(jí)的選用應(yīng)符合下列規(guī)定:
1A級(jí)鋼僅可用于結(jié)構(gòu)工作溫度高于0℃的不需要驗(yàn)算疲勞
的結(jié)構(gòu),且Q235A鋼不宜用于焊接結(jié)構(gòu)。高層鋼結(jié)構(gòu)選用Q235A
或Q235B級(jí)鋼時(shí)應(yīng)選用鎮(zhèn)靜鋼。
2需驗(yàn)算疲勞的焊接結(jié)構(gòu)用鋼材應(yīng)符合下列規(guī)定:
1)當(dāng)工作溫度高于0℃時(shí)其質(zhì)量等級(jí)不應(yīng)低于B級(jí);
2)當(dāng)工作溫度不高于0℃但高于﹣20℃時(shí),Q235、Q345
鋼不應(yīng)低于C級(jí),Q390、Q420及Q460鋼不應(yīng)低于D
級(jí);
3)當(dāng)工作溫度不高于﹣20℃時(shí),Q235、Q345鋼不應(yīng)低于
D級(jí),Q390、Q420及Q460鋼應(yīng)選用E級(jí)。
7
3需驗(yàn)算疲勞的非焊接結(jié)構(gòu),其鋼材質(zhì)量等級(jí)要求可較上述
焊接結(jié)構(gòu)降低一級(jí)但不應(yīng)低于B級(jí)。但對(duì)吊車起重量不小于50t
的中級(jí)工作制吊車梁,其質(zhì)量等級(jí)要求不能降低。
4工作溫度不高于﹣20℃的受拉構(gòu)件及承重構(gòu)件的受拉板
材的厚度或直徑小于40mm時(shí),質(zhì)量等級(jí)不低于C級(jí);當(dāng)其厚度
或直徑不小于40mm時(shí),質(zhì)量等級(jí)不低于D級(jí);重要承重結(jié)構(gòu)的
受拉板材宜滿足現(xiàn)行國(guó)家標(biāo)準(zhǔn)《建筑結(jié)構(gòu)用鋼板》GB/T19879的
要求。
3.1.11建筑用鋼型材的壁厚允許偏差,當(dāng)壁厚不大于10mm時(shí)不
得超過(guò)公稱壁厚的±4%,當(dāng)壁厚大于10mm時(shí)不得超過(guò)壁厚的
±3%,彎角及焊縫區(qū)域壁厚除外。
3.2鋼材化學(xué)成分和設(shè)計(jì)指標(biāo)
3.2.1Q235鋼的化學(xué)成分應(yīng)符合表3.2.1的規(guī)定。
表3.2.1Q235鋼的化學(xué)成分
化學(xué)成分(質(zhì)量分?jǐn)?shù))/%,≤
牌號(hào)質(zhì)量等級(jí)
CSiMnPS
A0.220.351.400.0450.050
B0.200.351.400.0450.045
Q235
C0.170.351.400.0400.040
D0.170.351.400.0350.035
8
3.2.2Q345鋼的化學(xué)成分應(yīng)符合表3.2.2的規(guī)定。
表3.2.2Q345鋼的化學(xué)成分
化學(xué)成分(質(zhì)量分?jǐn)?shù))/%,
質(zhì)量
牌號(hào)
等級(jí)CSiMnPSNbVTiCrNiCuNMoBAls
不大于不小于
A0.200.0350.035-
B0.200.0350.035-
Q345C0.200.501.700.0300.0300.070.150.200.300.500.300.0120.10-0.015
D0.180.0300.0250.015
E0.180.0250.0200.015
3.2.3Q355、Q390、Q420、Q460熱軋鋼的化學(xué)成分應(yīng)符合表
3.2.3-1的規(guī)定,其碳當(dāng)量應(yīng)符合表3.2.3-2的規(guī)定。
表3.2.3-1Q355、Q390、Q420、Q460熱軋鋼的化學(xué)成分
牌號(hào)化學(xué)成分(質(zhì)量分?jǐn)?shù))/%
CaSiMnPSNbdVeTieCrNiCuNfMoB
以下公稱厚
質(zhì)
度或直徑
量
鋼級(jí)/mm
等
級(jí)不大于
≤40b>40
不大于
B0.240.0350.0350.012
Q355C0.200.220.501.600.0300.030---0.300.300.400.012--
D0.200.220.0250.025-
9
續(xù)表3.2.3-1
牌號(hào)化學(xué)成分(質(zhì)量分?jǐn)?shù))/%
CaSiMnPSNbdVeTieCrNiCuNfMoB
以下公稱厚
質(zhì)度或直徑
量
鋼級(jí)/mm
等
級(jí)不大于
≤40b>40
不大于
B0.0350.035
Q390C0.200.501.700.0300.0300.050.130.050.300.500.400.0150.10-
D0.0250.025
B0.0350.035
Q420c0.200.501.700.050.130.050.300.800.400.0150.20-
C0.0300.030
Q460cC0.200.501.800.0300.0300.050.130.050.300.800.400.0150.200.004
a公稱厚度大于100mm的型鋼,碳含量可由供需雙方協(xié)商確定。
b公稱厚度大于30mm的鋼材,碳含量不大于0.22%。
c僅適用于型鋼和棒材。
dQ390、Q420最高可到0.07%,Q460最高可到0.11%。
e最高可到0.20%。
f如果鋼中酸溶鋁Als含量不小于0.015%或全鋁Alt含量不小于0.020%,或添加了
其他固氮合金元素,氮元素含量不作限制,固氮元素應(yīng)在質(zhì)量證明書(shū)中注明。
表3.2.3-2熱軋狀態(tài)交貨鋼材的碳當(dāng)量(基于熔煉分析)
碳當(dāng)量(質(zhì)量分?jǐn)?shù))/
牌號(hào)CEV%
不大于
公稱厚度或直徑/mm
鋼級(jí)質(zhì)量等級(jí)
≤30>30~63>63~150>150~250>250~400
10
續(xù)表3.2.3-2
碳當(dāng)量(質(zhì)量分?jǐn)?shù))/
牌號(hào)CEV%
不大于
公稱厚度或直徑/mm
鋼級(jí)質(zhì)量等級(jí)
≤30>30~63>63~150>150~250>250~400
B-
Q355aC0.450.470.470.49-
D0.49c
B
Q390C0.450.470.48--
D
B
Q420b0.450.470.480.49-
C
Q460bC0.470.490.49--
a當(dāng)需對(duì)硅含量控制時(shí)(例如熱浸鍍鋅涂層),為達(dá)到抗拉強(qiáng)度要求而增加其他
元素如碳和錳的含量,表中最大碳當(dāng)量值的增加應(yīng)符合下列規(guī)定:
對(duì)于Si≤0.030%,碳當(dāng)量可提高0.02%;對(duì)于Si≤0.25%,碳當(dāng)量可提高0.01%。
b只適用于型鋼和棒材。
c只適用于質(zhì)量等級(jí)為D的鋼板。
3.2.4鋼材的設(shè)計(jì)用強(qiáng)度指標(biāo),應(yīng)根據(jù)鋼材牌號(hào)、厚度或直徑按
表3.2.4采用。采用Q355鋼時(shí),需滿足相應(yīng)規(guī)范標(biāo)準(zhǔn)要求。
表3.2.4鋼材的設(shè)計(jì)用強(qiáng)度指標(biāo)(N/mm2)
強(qiáng)度設(shè)計(jì)值
屈服抗拉
鋼材厚度抗拉、端面承
強(qiáng)度強(qiáng)度
鋼材牌號(hào)或直徑抗壓、抗剪壓(刨
(mm)抗彎平頂緊)fyfu
fV
ffce
≤16215125235
碳素結(jié)構(gòu)
>≤
鋼Q23516,40205120320225370
>40,≤100200115215
≤16305175345
>16,≤40295170335
低合金高
強(qiáng)度結(jié)構(gòu)Q345>40,≤63290165400325470
鋼
>63,≤80280160315
>80,≤100270155305
11
續(xù)表3.2.4
強(qiáng)度設(shè)計(jì)值
屈服抗拉
鋼材厚度抗拉、端面承
強(qiáng)度強(qiáng)度
鋼材牌號(hào)或直徑抗壓、抗剪壓(刨
(mm)抗彎平頂緊)fyfu
fV
ffce
≤16345200390
>16,≤40330190370
Q390415490
>40,≤63310180350
>63,≤100295170330
≤16375215420
低合金高>16,≤40355205400
強(qiáng)度結(jié)構(gòu)Q420440520
鋼>40,≤63320185380
>63,≤100305175360
≤16410235460
>16,≤40390225440
Q460470550
>40,≤63355205420
>63,≤100340195400
>≤
建筑結(jié)構(gòu)Q34516,50325190345
415490
用鋼板GJ
>50,≤100300175335
注:1表中直徑指實(shí)芯棒材直徑,厚度系指計(jì)算點(diǎn)的鋼材或鋼管壁厚度,對(duì)軸心受拉和
軸心受壓構(gòu)件系指截面中較厚板件的厚度;
2冷彎型材和冷彎鋼管,其強(qiáng)度設(shè)計(jì)值應(yīng)按國(guó)家現(xiàn)行有關(guān)標(biāo)準(zhǔn)的規(guī)定采用。
3.2.5結(jié)構(gòu)用無(wú)縫鋼管的強(qiáng)度指標(biāo)應(yīng)按表3.2.5采用。
表3.2.5結(jié)構(gòu)用無(wú)縫鋼管的強(qiáng)度指標(biāo)(N/mm2)
強(qiáng)度設(shè)計(jì)值
鋼管鋼材壁厚抗拉、抗端面承壓屈服強(qiáng)度抗拉強(qiáng)度
牌號(hào)(mm)抗剪
壓和抗彎(刨平頂緊)fyfu
fV
ffce
Q235≤16215125320235375
12
續(xù)表3.2.5
強(qiáng)度設(shè)計(jì)值
屈服強(qiáng)度
鋼管鋼材壁厚抗拉、抗端面承壓抗拉強(qiáng)度
牌號(hào)(mm)抗剪
壓和抗彎(刨平頂緊)fyfu
fV
ffce
>16,≤30205120225
Q235320375
>30195115215
≤16305175345
Q345>16,≤30290170400325470
>30260150295
≤16345200390
Q390>16,≤30330190415370490
>30310180350
≤16375220420
Q420>16,≤30355205445400520
>30340195380
≤16410240460
Q460>16,≤30390225470440550
>30355205420
3.2.6焊縫的強(qiáng)度指標(biāo)應(yīng)按表3.2.6采用并應(yīng)符合下列規(guī)定:
1手工焊用焊條、自動(dòng)焊和半自動(dòng)焊所采用的焊絲和焊劑,
應(yīng)保證其熔敷金屬的力學(xué)性能不低于母材的性能。
2焊縫質(zhì)量等級(jí)應(yīng)符合現(xiàn)行國(guó)家標(biāo)準(zhǔn)《鋼結(jié)構(gòu)焊接規(guī)范》
GB50661的規(guī)定,其檢驗(yàn)方法應(yīng)符合現(xiàn)行國(guó)家標(biāo)準(zhǔn)《鋼結(jié)構(gòu)工程
施工質(zhì)量驗(yàn)收規(guī)范》GB50205的規(guī)定。其中厚度小于6mm鋼材
的對(duì)接焊縫,不應(yīng)采用超聲波探傷確定焊縫質(zhì)量等級(jí)。
對(duì)接焊縫在受壓區(qū)的抗彎強(qiáng)度設(shè)計(jì)值取w,在受拉區(qū)的
3fc
抗彎強(qiáng)度設(shè)計(jì)值取w。
ft
4計(jì)算下列情況的連接時(shí),表3.2.6規(guī)定的強(qiáng)度設(shè)計(jì)值應(yīng)乘以
13
相應(yīng)的折減系數(shù);幾種情況同時(shí)存在時(shí),其折減系數(shù)應(yīng)連乘:
1)施工條件較差的高空安裝焊縫應(yīng)乘以系數(shù)0.9;
2)進(jìn)行無(wú)墊板的單面施焊對(duì)接焊縫的連接計(jì)算應(yīng)乘折減
系數(shù)0.85。
表3.2.6焊縫的強(qiáng)度指標(biāo)(N/mm2)
角焊縫強(qiáng)
構(gòu)件鋼材對(duì)接焊縫強(qiáng)度設(shè)計(jì)值
度設(shè)計(jì)值角焊縫
對(duì)接焊抗拉、
焊接方焊縫質(zhì)量為
縫抗拉抗壓和
法和焊下列等級(jí)時(shí),抗拉、抗
厚度或直徑抗壓抗剪強(qiáng)度抗剪
條型號(hào)牌號(hào)抗拉w壓和抗剪
wftww強(qiáng)度
(mm)fcfvwfu
一級(jí)、fff
三級(jí)fu
二級(jí)
自動(dòng)焊、半≤16215215185125
自動(dòng)焊和
Q235>16,≤40205205175120160415240
E43型焊條
手工焊>40,≤100200200170115
≤16305305260175
>16,≤40295295250170
Q345>40,≤63290290245165
>63,≤80280280240160
200
自動(dòng)焊、半>80,≤100270270230155480280
自動(dòng)焊和>16,≤35310310265180(E50)(E50)
E50、E55型Q345GJ>35,≤50290290245170540315
焊條手工焊>50,≤100285285240165(E55)(E55)
≤16345345295200200
>16,≤40330330280190(E50)
Q390
>40,≤63310310265180220
>63,≤100295295250170(E55)
≤16375375320215
>16,≤40355355300205
Q420
自動(dòng)焊、半>40,≤63320320270185220540315
自動(dòng)焊和>63,≤100305305260175(E55)(E55)(E55)
E55、E60型≤16410410350235240590340
焊條手工焊>16,≤40390390330225(E60)(E60)(E60)
Q460
>40,≤63355355300205
>63,≤100340340290195
注:表中厚度系指計(jì)算點(diǎn)的鋼材厚度,對(duì)軸心受拉和軸心受壓構(gòu)件系指截面中較厚板件
的厚度。
3.2.7鋼材的物理性能指標(biāo)應(yīng)按表3.2.7采用。
14
表3.2.7鋼材的物理性能指標(biāo)
彈性模量E剪變模量G線膨脹系數(shù)質(zhì)量密度
(N/mm2)(N/mm2)(以每℃計(jì))(kg/m3)
33-6
206×1079×1012×107850
3.3耐候鋼
3.3.1耐候鋼各牌號(hào)的分類見(jiàn)表3.3.1。
表3.3.1耐候鋼各牌號(hào)分類
類別牌號(hào)生產(chǎn)方式
Q295GNH、Q355GNH熱軋
高耐候鋼
Q265GNH、Q310GNH冷軋
Q235NH、Q295NH、Q355NH
焊接耐候鋼Q415NH、Q460NH、Q500NH熱軋
Q550NH
3.3.2耐候鋼的化學(xué)成分應(yīng)符合表3.3.2的規(guī)定。
表3.3.2耐候鋼各牌號(hào)的化學(xué)成分
化學(xué)成分(質(zhì)量分?jǐn)?shù))/%
牌號(hào)
其他
CSiMnPSCuCrNi元素
Q265GNH≤0.120.10~0.400.20~0.500.07~0.12≤0.0200.20~0.450.30~0.650.25~0.50ea,b
Q295GNH≤0.120.10~0.400.20~0.500.07~0.12≤0.0200.25~0.450.30~0.650.25~0.50ea,b
Q310GNH≤0.120.25~0.750.20~0.500.07~0.12≤0.0200.20~0.500.30~1.25≤0.65a,b
Q355GNH≤0.120.20~0.75≤1.000.07~0.15≤0.0200.25~0.550.30~1.25≤0.65a,b
Q235NH≤0.13f0.10~0.400.20~0.60≤0.030≤0.0300.25~0.550.40~0.80≤0.65a,b
Q295NH≤0.150.10~0.500.30~1.00≤0.030≤0.0300.25~0.550.40~0.80≤0.65a,b
Q355NH≤0.16≤0.500.50~1.50≤0.030≤0.0300.25~0.550.40~0.80≤0.65a,b
Q415NH≤0.12≤0.65≤1.10≤0.025≤0.030d0.20~0.550.30~1.250.12~0.65ea,b,c
15
續(xù)表3.3.2
化學(xué)成分(質(zhì)量分?jǐn)?shù))/%
牌號(hào)
其他
CSiMnPSCuCrNi元素
Q460NH≤0.12≤0.65≤1.50≤0.025≤0.030d0.20~0.550.30~1.250.12~0.65ea,b,c
Q500NH≤0.12≤0.65≤2.0≤0.025≤0.030d0.20~0.550.30~1.250.12~0.65ea,b,c
Q550NH≤0.16≤0.65≤2.0≤0.025≤0.030d0.20~0.550.30~1.250.12~0.65ea,b,c
a為了改善鋼的性能,可以添加一種或一種以上的微量合金元素:Nb
0.015%~0.060%,V0.02%~0.12%,Ti0.02%~0.10%,Alt≥0.020%。若上述元素
組合使用時(shí),應(yīng)至少保證其中一種元素含量達(dá)到上述化學(xué)成分的下限規(guī)定。
b可以添加下列合金元素:Mo≤0.03%,Zr≤0.15%。
cNb、V、Ti等三種合金元素的添加總量不應(yīng)超過(guò)0.22%。
d供需雙方協(xié)商,S的含量可以不大于0.008%。
e供需雙方協(xié)商,Ni含量的下限可不做要求。
f供需雙方協(xié)商,C的含量可以不大于0.15%。
3.3.3耐候鋼材的力學(xué)性能和工藝性能應(yīng)符合表3.3.3的規(guī)定。
表3.3.3耐候鋼材的力學(xué)性能和工藝性能
拉伸試驗(yàn)
下屈服強(qiáng)度180o彎曲試驗(yàn)
斷后伸長(zhǎng)率
2A/%彎心直徑
牌號(hào)ReL/(N/mm)抗拉不小于
不小于
強(qiáng)度Rm
>16,>40,(N/mm2)>16,>40,>6,
≤16>60≤16>60≤6>16
≤40≤60≤40≤60≤16
Q235NH235225215215360~51025252423tt2t
Q295NH295285275255430~56024242322t2t3t
Q295GNH295285——430~5602424——t2t3t
Q355NH355345335325490~63022222120t2t3t
Q355GNH355345——490~6302222——t2t3t
Q415NH415405395—520~680222220—t2t3t
Q460NH460450440—570~7302020——t2t3t
Q500NH500490480—600~760————t2t3t
Q550NH550540530—620~780————t2t3t
Q265GNH265———≥41027———t——
Q310GNH310———≥45026———a——
注:本表中t為鋼材厚度;拉伸試驗(yàn)時(shí),當(dāng)屈服現(xiàn)象不明顯時(shí),可以采用RP0.2。
16
3.3
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