论文部分内容阅读
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。
In view of the phenomenon that the longitudinal delamination of the steel bridge deck pavement is liable to occur due to the lack of transverse rigidity of the bridge deck, a flat steel plate shear connection (hereinafter referred to as “flat steel plate shear key”) capable of improving the lateral rigidity of the bridge deck is proposed. ) That connects the steel deck to the reactive powder concrete (RPC) layer. In order to study the mechanism of shear force transmission in the bridge deck, a nonlinear finite element model of the composite bridge deck was established. The failure mode, shear capacity and load of the bridge deck - slip curve of the correctness of the combination of finite element models and test results obtained by the flat plate shear bond push the failure mode of the specimen; the use of experimental verification of the numerical simulation of the connection plate thickness, reactive powder concrete compression The influence of the strength, the yield strength of the connector and the presence or absence of steel mesh on the shear strength of the plate-shear-key-steel-RPC composite bridge deck. The results show that the failure modes of the flat steel plate shear bond are mainly divided into two parts: the root of the connecting piece is pulled down and the partial pressure failure of RPC under the shear key occurs; when the compressive strength of RPC is 80, 100, 120 and 140 MPa , The corresponding reasonable thickness of the flat steel plate shear force keys are respectively 6, 8, 10, and 12 mm. With the increase of the strength of the shear plate of the flat steel plate, the shear capacity of the composite bridge deck plate is correspondingly increased, With the increase of RPC material strength, the shear capacity of composite bridge deck increased correspondingly and the increase rate of composite bridge deck increased less when the thickness of joint was small. Bearing capacity and stiffness contribution is small, but can significantly increase the shear deck ductility.