Z2类疲劳破坏叠合板组合梁疲劳性能试验研究

Experimental Research on Fatigue Life of Composite Beams with Laminated Slabs and Z2 Fatigue Details

为推广装配式建造技术及钢-混凝土组合梁在桥梁结构和吊车梁中的应用,有必要对各类构造细节的组合梁疲劳寿命进行试验研究,本论文通过对6根组合梁(其中5根叠合板组合梁,1根现浇板组合梁)施加等幅疲劳荷载,并采用双对数函数对其中5根发生Z2类构造细节疲劳破坏组合梁试验数据进行线性拟合,得到了基于Z2类构造细节组合梁疲劳破坏时的S-N曲线。试验结果与欧洲钢结构协会(ECCS)的规定十分接近,与GB 50017—2003《钢结构设计规范》符合得很好,但与现行GB 50017—2017《钢结构设计标准》有一定偏差,主要是因为新旧标准对构造细节分类有所不同。采用新标准结果偏于不安全,现阶段在整梁试验数据有限的情况下进行组合梁的设计时,建议按照GB 50017—2003中的相关规定进行复核。

In order to popularize the prefabrication construction technology and the application of steel-concrete composite beams in bridge structures and crane beams,it is necessary to carry out experimental research on fatigue life of composite beams with various structural details.6 composite beams(including 5 composite beams with laminated slabs and 1 composite beam with cast-in-place slabs)were subjected to constant amplitude fatigue load.The double logarithm function was used to linearly fit the test data of 5 composite beams with Z2 structural details,and the S-N curve was obtained.The test results were very close to the provisions of European Convention for Constructional Steelwork(ECCS)and in good agreement with Code for Design of Steel Structures(GB 50017—2003),but there was a certain deviation from GB 50017—2017,mainly because their classifications of structural details were different.The adoption to GB 50017—2017 were unsafe.At this stage,it was recommended to review the design of composite beams in accordance with the relevant provisions of GB 50017—2003.