ESDU 81007-1981 带焊接附件的工字钢弯曲疲劳强度

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81007



FATIGUE STRENGTH IN BENDING OF STEEL I-BEAMS WITH WELDED

ATTACHMENTS

1. NOTATION

Both SI and British units are quoted.

2. INTRODUCTORY NOTES

This Item presents data on the fatigue strength in bending of structural steel I-beams with welded

cover-plates or with stiffening gussets welded to the webs and to one or both flanges. The attachments were

of similar composition to the beam materials and the types and configurations of attachments to which the

data apply are illustrated in Sketches 2.1 and 2.2. The data were obtained from tests on rolled or welded

beams of between 100 mm (4 in) depth by 75 mm (3 in) width and 400 mm (16 in) depth by 200 mm (8 in)

width in the as-welded condition. The beams were tested in four point bending in the plane of the web.

In Figures 1 to 7 data are presented in terms of the nominal principal stress range, , in the beam in the

critical regions at the ends of attachments or weld runs. These stresses were determined either by strain

gauge analysis or by calculation using simple bending theory. For attachments falling within the constant

moment region and for attachments welded to the tension flange outside the constant moment region, the

fibre stress calculated using simple bending theory, was taken as the nominal principal stress. Where the

critical region was positioned on the web of the beam and outside the constant moment region, shear stresses

were taken into account when calculating the nominal principal stress. (When calculating the second

moment of area the cover-plate was only taken into account where full length cover-plates existed.)

Provided that the welds are sound and free from major defects, the fatigue strength above cycles of

structural steel I-beams with attachments having undressed welds is independent of the properties of both

plate and weld materials. The fatigue strength is independent of applied tensile mean stress within the range

of mean stresses for which data were available (0 to 235 MN/m2). This is because as-welded joints contain

a system of localised residual stresses in the direction of stressing which result from the internal constraints

developed during cooling of the weld and which are normally of the order of the material yield strength.

Thus, the first few load cycles may cause local yielding in critical regions, such as the ends of weld runs

in longitudinal welds and along the weld toe in transverse welds. The actual stress experienced in the critical

regions will, thereafter, cycle between the material yield strength and the yield strength less the applied

stress range irrespective of applied mean stress (except in cases of high compressive mean stress, see

Section 3.3). Beams larger than those tested may be expected to exhibit fatigue lives at the lower end of

the scatter band due to the full development of these residual stresses.

Mean lines and scatter bands that enclose 95 per cent of the data are provided on Figures 1 to 4. A comparison

of the mean lines for the various joints covered by this Item is given in Figure 5. Mean lines and lower

bounds of Figures 1 to 4 are compared with those given in BS 5400 for similar joint types, see Section 5

and Figures 6 and 7.

endurance

maximum nominal alternating principal stress (half range) in

beam in critical regions at ends of attachments or weld runs

(see Section 2 for different cases)

N/m2lbf/in2

2Sa

104

Issued August 1981

ESDU product release: 2006-01. For current status, contact ESDU. Observe Copyright.

北极星标准文库-高清标准规范分享平台 www.bjxwk.com

81007



Sketch 2.1 Cover-plate attachments (Types 1 to 6)

ESDU product release: 2006-01. For current status, contact ESDU. Observe Copyright.

北极星标准文库-高清标准规范分享平台 www.bjxwk.com

81007



Sketch 2.2 Stiffener attachments (Types 7 to 9)

(see Section 4 for notes)

ESDU product release: 2006-01. For current status, contact ESDU. Observe Copyright.

北极星标准文库-高清标准规范分享平台 www.bjxwk.com

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标签： #带 #钢 #焊接

摘要：

本文档详细解读了英国工程科学数据单元标准 ESDU 81007-1981，专注于研究带焊接附件的工字钢在弯曲载荷下的疲劳强度评估方法。该标准为钢结构设计、桥梁工程及重型机械制造领域提供了关键的技术参考，重点分析了焊接接头几何形状、应力集中系数及疲劳寿命预测模型。通过本内容，工程师可掌握如何利用该标准优化工字钢焊接附件的设计，避免因疲劳裂纹导致的结构失效，显著提升承载构件的安全性与耐久性。对于从事钢结构疲劳分析、焊接工艺评定及有限元仿真的技术人员，这是不可或缺的专业资料。

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ESDU 81007-1981 带焊接附件的工字钢弯曲疲劳强度

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