带平钢板剪力连接件的钢-RPC组合桥面板抗剪性能

发布时间：2018-09-14 07:02

【摘要】：针对目前钢桥面铺装层因桥面横向刚度不足较易产生纵向裂缝的现象,提出一种能够提高桥面板横向刚度的平钢板抗剪连接件(以下称"平钢板剪力键"),该剪力键可使钢桥面板与活性粉末混凝土(reactive powder concrete,RPC)层连接在一起。为研究这种连接件组合桥面板中的抗剪传力机理,建立了组合桥面板推出试验的非线性有限元模型,并采用推出试验验证了该数值模型的破坏模式、抗剪承载力以及荷载-滑移曲线的正确性;结合有限元模型和试验结果,得到了平钢板剪力键推出试件的破坏模式;利用经试验验证的数值模拟方法分析了连接件板厚、活性粉末混凝土抗压强度、连接件屈服强度和有无钢筋网等参数对平钢板剪力键钢-RPC组合桥面板抗剪承载力的影响。研究结果表明:平钢板剪力键的破坏模式主要分为连接件根部被拉坏和剪力键下方RPC局部承压破坏2种;当RPC的抗压强度分别为80、100、120、140 MPa时,对应的平钢板剪力键的合理厚度分别为6、8、10、12mm;随着平钢板剪力键材料强度的提高,组合桥面板抗剪承载力相应提高,且平钢板连接件厚度较小时提高幅度较明显,而厚度较大时提高不明显;随着RPC材料强度的提高,组合桥面板抗剪承载力相应提高,且连接件厚度较小时提高幅度较小;增设钢筋网对其承载力和刚度贡献不大,但可明显增大组合桥面板的抗剪延性。
[Abstract]:In view of the phenomenon that longitudinal cracks are easy to occur in steel deck pavement due to the lack of transverse stiffness of the deck at present, A kind of flat steel plate shear joint (hereinafter referred to as "flat plate shear key") which can improve the transverse stiffness of bridge deck slab is proposed. The shear bond can connect the steel deck slab with the reactive powder concrete (reactive powder concrete,RPC) layer. In order to study the shear force transfer mechanism of the composite deck slab, a nonlinear finite element model for the launching test of the composite deck slab is established, and the failure mode of the numerical model is verified by the deductive test. According to the finite element model and the test results, the failure mode of the shear bond of flat steel plate is obtained, and the thickness of the joint plate is analyzed by the numerical simulation method verified by the experiment. The influence of the parameters such as the compressive strength of reactive powder concrete, the yield strength of connectors and the presence of steel mesh on the shear capacity of flat steel plate shear bond steel -RPC composite deck slab. The results show that the failure modes of shear bond of flat steel plate are mainly divided into two types: tensile failure at the base of connection and local compression failure of RPC under shear bond, and when the compressive strength of RPC is 80100120140 MPa, The reasonable thickness of the corresponding plate shear bond is 6 / 8 / 10 ~ (12) mm respectively. With the increase of the strength of the flat steel plate shear bond material, the shear bearing capacity of the composite bridge deck is increased accordingly, and the thickness of the flat steel plate joint is obviously increased by a small extent. With the increase of the strength of RPC material, the shear capacity of composite deck plate increases correspondingly, and the thickness of the joint increases slightly, and the addition of steel mesh does not contribute much to the bearing capacity and stiffness of the composite bridge slab. But the shear ductility of composite deck can be increased obviously.
【作者单位】：福州大学土木工程学院;
【基金】：国家自然科学基金重点项目(U1305245);国家自然科学基金项目(51478120)
【分类号】：U443.31

【参考文献】