ECC桥面板中栓钉抗剪性能试验研究与数值分析  

Experimental Study and Numerical Analysis of Shear Behavior of Studs Embedded in Engineered Cementitious Composite Bridge Decks

作　　者：刘益铭 张清华[2] 卜一之[2] LIU Yiming;ZHANG Qinghua;BU Yizhi(School of Civil Engineering,Qingdao University of Technology,Qingdao 266520,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]青岛理工大学土木工程学院,山东青岛266520 [2]西南交通大学土木工程学院,四川成都611756

出　　处：《西南交通大学学报》2025年第1期35-44,共10页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金项目(52008218);中国博士后科学基金项目(2022M710048)。

摘　　要：为研究栓钉在工程用水泥基复合材料(ECC)中的抗剪性能,开展模型试验研究与有限元数值分析.基于推出模型试验,明确ECC中栓钉的破坏模式,通过参数化有限元数值分析,进一步阐明栓钉直径、栓钉长径比、栓钉抗拉强度、ECC抗压强度对连接件抗剪性能及其失效模式的影响规律,并在上述研究的基础上,建立适用于ECC中栓钉抗剪承载力的计算方法.研究表明:ECC中栓钉抗剪强度与推出模型的失效模式紧密相关,当推出模型的破坏模式表现为ECC压溃时,连接件的抗剪强度取决于ECC的抗压性能;当推出模型的破坏模式表现为栓钉剪断时,连接件的抗剪强度取决于栓钉的抗拉强度与ECC的抗压性能;提高ECC抗压强度与减小栓钉长径比均有利于提升连接件的抗剪刚度,但栓钉的抗拉强度对连接件的抗剪刚度影响较小;当栓钉长径比小于4.60时,栓钉抗剪强度随长径比的减小有所降低,建议采用长径比大于4.60的栓钉作为钢梁与ECC桥面板的剪力连接件.In order to study the shear behavior of studs embedded in engineered cementitious composites(ECC),model tests and the numerical analysis of finite elements were carried out.The failure mode of studs embedded in ECC was determined based on push-out model tests.Then,parametric numerical analysis of finite element was performed to elucidate the effects of stud diameter,height/diameter ratio of stud,tensile strength of stud,and compressive strength of ECC on the shear behavior and failure mode of connectors.Finally,a method for calculating the shear capacity of studs embedded in ECC was established according to the above research.The results show that the shear strength of studs embedded in ECC is closely related to the failure mode of the pushout model.When the push-out model fails due to ECC crushing,the shear strength of the connector depends on the compressive properties of ECC.When the push-out model fails due to stud fracture,the shear strength of the connector depends on the tensile strength of the stud and compressive properties of ECC;increasing the compressive strength of ECC and reducing the height/diameter ratio of the stud both can improve the shear stiffness of the connector,but the tensile strength of the stud has a slight effect on the shear stiffness of the connector.When the height/diameter ratio of the stud is lower than 4.60,the shear strength of the stud reduces with the decreasing height/diameter ratio of the stud.Studs with a height/diameter ratio of greater than 4.60 are recommended to serve as a shear connector applied in steel-ECC bridge decks.

关 键 词：桥梁工程 栓钉 推出试验 抗剪性能 工程用水泥基复合材料 

分 类 号：U443.32[建筑科学—桥梁与隧道工程]