组合梁应力幅指标的参数分析及其应用  

Parameter Analysis and Application of Stress Amplitude Index of Composite Beam

作　　者：袁西贵 帅志兴 卞宗舒 YUAN Xigui(College of Urban Construction,Chengdu Polytechnic,Chengdu Sichuan 610218,China)

机构地区：[1]成都职业技术学院城建学院,四川成都610218 [2]四川省省级机关房屋建设中心,四川成都610020 [3]浙江精工钢结构集团有限公司钢构研究院,浙江绍兴312030

出　　处：《长春工程学院学报（自然科学版）》2023年第2期11-16,共6页Journal of Changchun Institute of Technology：Natural Sciences Edition

基　　金：国家自然科学基金项目(51168010);四川省教育厅2017年度科研计划自然科学类重点项目(17ZA0140);院级科研项目(22CZYG0121);装配式建造技术科研创新团队(22KYTD02)。

摘　　要：为判断和控制组合梁的疲劳破坏形态,分析了组合梁的截面尺寸、混凝土强度等级、剪力连接程度以及荷载幅值等参数对应力幅指标λ的影响,结果表明:并非所有不完全剪力连接组合梁都只发生栓钉剪坏的疲劳破坏,有时剪力连接程度γ很低的组合梁也可能存在钢梁拉裂的疲劳破坏形态。而且由于完全剪力连接组合梁的计算应力幅指标较大,也可能导致发生栓钉剪坏的疲劳破坏。组合梁的疲劳破坏形态取决于计算应力幅指标与钢梁各个构造细节相应的界限应力幅指标[λ]的相对大小。To determine and control the fatigue failure mode of composite beams,it analyzes the influence of parameters such as cross-sectional size,concrete strength grade,shear connection degree and load amplitude on the stress amplitude index of composite beams.The results show that not all incomplete shear connection composite beams only experience fatigue failure caused by bolt shear failure,and sometimes composite beams with low shear connection degree may also experience fatigue failure mode of steel beam tensile cracking.Moreover,due to the large calculated stress amplitude index of fully shear connected composite beams,it may also lead to fatigue failure of bolt shear failure.The fatigue failure mode of composite beams depends on the relative size of the calculated stress amplitude index and the corresponding boundary stress amplitude index for each structural detail of the steel beam.

关 键 词：组合梁 应力幅指标 剪力连接程度 破坏形态 疲劳破坏 

分 类 号：TU398[建筑科学—结构工程]