橡胶改性纤维增强水泥基复合材料桥面连接板受拉性能研究

Research on Tensile Properties of Rubber Modified Fiber Reinforced Cement-based Composite Bridge Deck Connecting Plate

为对比分析低弹性模量的橡胶改性ECC(Rubberized Engineered Cementitious Composite)制成的桥面连接板与普通ECC桥面连接板的受拉性能,本文设计了两个同尺寸的橡胶改性ECC和普通ECC桥面连接板。试验结果表明:橡胶的加入,在相同配筋的情形下,ECC桥面连接板受拉时多缝开裂的现象更加明显,而对其最大抗拉承载力的影响甚微。另外,通过有限元模拟分析比较了配置FRP筋和钢筋时不同变形受力特点,有限元模拟结果表明,FRP能有效降低ECC连接板最大主应力,增强其多缝开裂特性。

To compare and analyze the tensile properties of bridge deck connecting plates made of rubber modified ECC(Rubberized Engineered Cementitious Composite)and ordinary ECC,two bridge deck connecting plates with the same size were designed in this paper.The test results show that with the addition of rubber,under the same reinforcement,the phenomenon of multi-joint cracking of ECC bridge deck connecting plate is more obvious when it is in tension,but it has little effect on its maximum tensile bearing capacity.In addition,the stress characteristics of different deformations are compared by finite element simulation analysis when FRP bars and steel bars are configured.The finite element simulation results show that FRP can effectively reduce the maximum principal stress of ECC connection plate and enhance its multi-crack cracking characteristics.