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书 书 书

51

 

2016

       

西

 

 

 

 

 

 

 

JOURNAL OF SOUTHWEST JIAOTONG UNIVERSITY

        Vol. 51  No. 4 Aug. 2016

稿

20150504

:国

51308467

51378431

);中

2013G001A2

:廖

1989

),男

,博士研究生

,研究方向为钢结构桥梁的疲劳及桥梁结构抗震

,电话

15198009516

Email

simafeiyun. xiao@ 163. com

:卫

1976

),男

,博

,副

,研

,电

13808013806

Email

we_star@ 163. com

:廖

,肖

,卫

,等

寿

西

2016

51

):

639644.    

02582724

2016

04063906    DOI

10. 3969 / j. issn. 02582724. 2016. 04. 006

主梁新细节的疲劳寿命预测及参数分析

 

 

 

 

 

 

 

(西

,四

川成

610031

 

:为

、过

、焊

,采

寿

,并

,在

:基

寿

,但

15%

;主

,小

1. 6%

,对

;焊

、过

、翼

,但

10%

;热

、腹

、翼

,腹

21. 6%

10% .

,且

:钢

;热

;参

;主

;应

U448. 36   

Fatigue Life Prediction and Parameter Analysis

of Girder New Detail

LIAO Ping

  XIAO Lin

  WEI Xing

  ZHAO Renda

  TANG Jishun

School of Civil Engineering

Southwest Jiaotong University

Chengdu 610031

China

Abstract

In order to study the influence of the cope hole radius

shape and fillet weld size of the new

detail of Hutong Railway Yangtze River Bridge girder on fatigue performance

the hot spot stress

method was used to predict fatigue life

and the calculation results were compared with the experiment

results of 9 welded specimens

then parameter analysis based on finite element models was conducted.

The results show that

a little difference exists between fatigue life predicted by hot spot stress method

and the results of fatigue experiments

which is within 15%

the mesh size of flange plate near the

cope hole had little impact for hot spot stress

which is within 1. 6%

twopoint and threepoint

extrapolation method are feasible for this new detail

the fillet weld size and the cope hole radius have

some influence on the maximum stress of flange plate and hot spot stress

the variation range is within

10%

the ratio of major and minor axes has a significant impact on the maximum stress of flange plate

and web and hot spot stress

the variation range of web is 21. 6%

however

the others are not beyond

10% . It is suggested that the welded detail with elliptical the cope hole can be used if the condition

allowed

and large ratio of major and minor axes should be selected.

Key words

steel truss bridge

hot spot stress method

parameter analysis

girder new detail

stress

concentration coefficient

(2)

西

 

 

 

 

 

 

 

51

   

、拉

、焊

,严

使

,人

们对钢桥疲劳的认识也在不断加

,钢

寿

命的预测评估已成为热门研究课

寿

,即

SN

线

Miner

寿

(热

、名

、缺

)、基

寿

1 092 m

,主

,主

,虽

,但

,因

疲劳实验

主航道桥的两节间全焊

,两

,全

、铆

,无

,可

,经

,但

,如

,反

,但

,复

,它

,很

力状态

,且名义应力是依赖焊

,不

接头形式需进行不同试验来确定

SN

线

,能

情况

,然而局部的缺口应力计

几何参数非常敏感

,且三维结

线

,可

35

,比

,但

69

寿

寿

,为

,具

1 

   

,设

16 mm

,分

,每

,分

63 MPa

7 ~ 70 MPa

)、

81 MPa

9 ~

90 MPa

)、

99 MPa

11 ~ 110 MPa

),应

0. 1

,采

50 t

100 t MTS

81

99 MPa

3 Hz

63 MPa

3. 2 Hz.

劳寿命分别为

158. 68

136. 54

131. 09

82. 19

76. 42

82. 63

42. 50

43. 88

40. 30

SQ1i

SQ2i

SQ3i

i = 1

3.

                                                         

1 

Fig. 1  Elevation of welded detail with the cope hole                                                                   

2 

Fig. 2  Planform of welded detail with the cope hole

2 

2. 1 

   

,热

,指

10

,只

有关

主梁新细节焊接热点类型为

,热

、有

、应

,由

、打

,故

ANSYS

ANSYS

,过

,网格局部划分结果如图

,采用

SOLID45

,焊

,一

(3)

 

,等

:主

寿

31. 05 t

,整

0. 4

σ

σ

0. 9

σ

1. 4

σ

,然

IIW

σ

σh

σ

sh

= 1. 67σ

- 0. 67σ

σ

sh

= 2. 52σ

- 2. 24σ

+ 0. 72σ

、三

,其

1 

Tab. 1  Grid division of hot spot stress method  mm

型 焊

1 8

2 8 3. 2

3 8 1. 6

4 8 0. 8

)两

)三

)模

)模

3 

Fig. 3  Grid division graphs of hot spot stress method

4 

Fig. 4  Finite element model of hot spot stress method

2. 2 

   

:(

)对

,不

1. 6% .

)两

得到的热点应力在同一网格尺寸下相差不到

2. 5%

,说

2. 3 

   

,分

力幅值为

63 MPa

7 ~ 70 MPa

)、

81 MPa

9 ~

90 MPa

)、

99 MPa

11 ~ 110 MPa

)所

,其

4.

2 

Tab. 2  l Results of twopoint extrapolation method

别 模

4 σ1/ MPa 106. 93 107. 12 106. 96 106. 88 σ2/ MPa 102. 30 101. 57 101. 78 101. 37 σsh/ MPa 110. 04 110. 84 110. 43 110. 58

/ % 0. 00 0. 73 0. 36 0. 49

3 

Tab. 3  Results of threepoint extrapolation method

别 模

4 σ1/ MPa 107. 28 107. 60 107. 39 107. 28 σ3/ MPa 103. 01 102. 48 102. 36 102. 30 σ4/ MPa 99. 92 99. 60 99. 68 99. 56 σsh/ MPa 111. 56 113. 31 113. 10 112. 89

/ % 0. 00 1. 57 1. 38 1. 20

(4)

西

 

 

 

 

 

 

 

51

4 

Tab. 4  Hot spot stress of fatigue specimens    MPa

称 名

值 热

SQ1i 63 110. 04 SQ2i 81 141. 48 SQ3i 99 172. 92

3 

寿

3. 1 

寿

   

SN

线

1115

IIW

SN

线

Eurocode

造细节分类及热点应力幅值

SN

曲线与

IIW

10

,图

给出了这两条热点应力幅

SN

线

16

,采

100

SN

线

寿

寿

N = 100

× 2 × 10

/ σ

sh m

m = 3

σ

sh

SN

线

寿

(应

),其

5.

5 

SN

线

Fig. 5  SN curves of hot spot stress amplitude

5 

寿

Tab. 5  Calculate results of fatigue life

/ MPa

/ MPa

寿

SQ1i 63 110. 04 1. 50 SQ2i 81 141. 48 0. 71 SQ3i 99 172. 92 0. 39

3. 2 

   

寿

寿

,其

6.

,采

寿

命与实测值存在一定的差距

,其主要原因是

)疲

;(

)建

、焊

、表

、焊

;(

)焊

,纵

,同

,特

还可以看出

:除

63 MPa

应力幅值的

SQ12

SQ13

个试件外

,当实测值保守超过预测

,而

SQ12

SQ13

,同

,其

、焊

6 

寿

Tab. 6  Results comparison of fatigue life

SQ11 1. 59 1. 50 SQ12 1. 37 1. 50 SQ13 1. 31 1. 50 SQ21 0. 82 0. 71 SQ22 0. 76 0. 71 SQ23 0. 83 0. 71 SQ31 0. 43 0. 39 SQ32 0. 44 0. 39 SQ33 0. 40 0. 39

4 

   

,主

横向焊缝的焊趾处开始的

,翼缘板

(图

)的

寿

、焊

、过

、过

,在

,未

(图

)由

(5)

 

,等

:主

寿

,影

,将

、腹

1 m

其余截面均无突变

,板厚仍然采用

16 mm

,截

1 m

,有

,采

70 MPa

. σ

ymax

σ

fmax

σ

sh

为翼缘板

、腹板

、两点外

,翼

、腹

,二

、翼

6 

Fig. 6  Finite element model of parameter analysis

4. 1 

   

4 cm

,焊

10

12

14 mm

,其

,计

7.

               









   



7 

Fig. 7  Fillet weld size and each stress

,翼

、应

,角

12 cm

,超

12 cm

,因

(超

),翼

,热

σ

σ

,根

)得

4. 2 

   

8 mm

,焊

7 cm

,其

,计

,过

,可

,翼

、焊

            









  



8 

Fig. 8  The cope hole radius and each stress

4. 3 

   

8 mm

,改

,分

5 cm × 6 cm

4 cm × 6 cm

4 cm ×

7 cm

4 cm × 8 cm

,其

,计

9 

Fig. 9  Ratio of semimajor and semiminor axis and each stress

,腹

、翼

5 

 

   

,可

)基

寿

寿

,对

)主

(6)

西

 

 

 

 

 

 

 

51

,不

1. 6%

,两

2. 5%

)在

定焊脚尺寸范围内

,翼缘板最大应

、腹

,超

,翼

、焊

,过

)腹

、翼

,对

,说

、腹

,且

 

钢桁桥腹杆过焊孔焊接细节疲劳性能研究

:西

2014.

  HOBBACHCR A F. The new IIW recommendations for fatigue assessment of welded joints and componentsa comprehensive code recently updated

. International Journal of Fatigue

2009

31

):

5058.

  RADAJ D

SONSINO C M

FRICKE W. Recent developments in local concepts of fatigue assessment of welded joints

. International Journal of Fatigue

2009

31

):

211.

 

,黄

,崔

,等

2004

):

9199. ZHANG Yi

HUANG Xiaoping

CUI Weicheng

et al. Finite element analysis on stress concentration at weld toe of buttwelded joints

. CSSRC Reports

2004

):

9199.

  NIEMI E

FDCKE W

MADDOX S J. Fatigue analysis of welded components

designers guide to the structural hotspot stress approach

IIW143000

)[

. Cambridge

Woodhead Publishing Limited

2006.

 

王亚飞

,徐海鹰

热点应力法进行钢桥疲劳检算

2012

):

5052. WANG Yafei

XU Haiying. Check of steel bridge fatigue with hot spot stress method

. Journal of Railway Engineering Society

2012

):

5052.

 

,张

,姚

,等

2015

37

):

2429. LIU Xu

ZHANG Kailin

YAO Yuan

et al. Application of notch stress method in fatigue analysis of locomotive welded frame

. Journal of the China Railway Society

2015

37

):

2429.

 

,高

,刘

,等

桥面板疲劳验算[

西南交通大学学报

2013

48

):

395400. PU Qianhui

GAO Liqiang

LIU Zhenbiao

et al. Fatigue assessment of orthotropic steel bridge deck based on hot spot stress method

. Journal of Southwest Jiaotong University

2013

48

):

395400.

 

,卜

,张

,等

钢桥面板疲劳寿命评估[

桥梁建设

2014

44

):

6265. CUI Chuang

BU Yizhi

ZHANG Qinghua

et al. Fatigue life assessment of orthotropic steel deck plate based on hot spot stress method

. Bridge Construction

2014

44

):

6265.

10

 

,白

,曾

例[

2010

):

3134. FANG Xing

BAI Ling

ZENG Zhibin. Application method and example of hot stress method in fatigue assessment of steel bridge component

. Railway Engineering

2010

):

3134.

11

  FRICKE W. Recommended hot spot analysis procedure for structural details of FPSOs and ships based on roundrobin FE analyses

. International Journal of Offshore and Polar Engineering

2002

12

):

4047.

12

  MODDOX S J. Hotspot stress design curves for fatigue assessment of welded structures

. International Journal of Offshore and Polar Engineering

2002

12

):

134141.

13

  KANG S W

KiIM W S. A proposed SN curve for welded ship structures

. Welding Journal

2003

82

):

161168.

14

  KIM W S

LOTSBERG I. Fatigue test data for welded connections in shipshaped structures

. Journal of Offshore Mechanics and Arctic Engineering

2005

127

11

):

359365.

15

  LOTSBERG I

SIGURDSSON G. Hot spot stress SN curve for fatigue anaysis of plated structures

. Journal of Offshore Mechanics and Arctic Engineering

2006

128

11

):

330336.

16

  European Committee for Standardization. EN199319

2005 design of steel structures part 19

fatigue

. Brussels

European Committee for Standardization

2005

620.

(中

、英

:徐

 

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