研究目的：目前,国内外对轻骨料混凝土的组合梁及剪力钉连接件疲劳性能研究较少。为此,本文旨在设计制作一组轻骨料混凝土栓钉推出试件,并进行疲劳试验。通过对试验数据的拟合处理,得到试件的疲劳强度、疲劳曲线等,并和相关规范及已有成果进行对比，以评价该类试件的抗疲劳性能,为轻骨料混凝土在桥梁钢混凝土组合梁上的应用提供依据。
研究结论:试验结果表明：（1)轻骨料混凝土栓钉连接件50%和97. 72%保证率下的疲劳强度分别为 126.7 MPa和105.5 MPa，该结果与其它关于普通混凝土栓钉连接件的相关研究成果差异不大，且要高于 Eurocode 4规范值;（2 )试件的疲劳曲线特性和疲劳破坏形式方面与普通混凝土栓钉连接件基本相似，这说明轻骨料混凝土运用在剪力钉连接件的方案是可行的;（3)该研究成果可以在组合梁桥等类似工程中推广应用。
Research purposes: At present，the fatigue performance research of lightweight aggregate concrete headed stud connectors is very few At home and abroad. Therefore，designing a set of lightweight aggregate concretes headed stud connectors push - out specimens， and fatigue tests are carried out. By fitting experimental data processing， the fatigue Ultimate strength， fatigue curve is obtained . Then compared with the related specifications and the gained achievements，to evaluate the fatigue resistance of specimens. The result of research also can provide the basis for the lightweight aggregate concrete on Steel - Concrete Composite Beam of bridge.
Research conclusions :(1) The test results show that the fatigue strength of lightweight aggregate concrete stud connectors guaranteed rate of 50% and 97. 72% is respectively 126. 7，105. 5 MPa. The difference between the results and other related research results on ordinary concrete stud connectors is little， and is higher than the corresponding standard value of the Eurocode 4. (2 ) The fatigue curve and fatigue failure mode with ordinary concrete headed stud connectors are similar，indicating that the lightweight aggregate concrete used in the shear stud connectors is feasible. (3) The research results can be popularized in similar engineering，such as composite beam bridge and so on.
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