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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

鋼級(jí)/mm

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

鋼級(jí)/mm

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

>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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