Experimental Study and Numerical Analysis of Shear Behavior of Studs Embedded in Engineered Cementitious Composite Bridge Decks
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摘要:
为研究栓钉在纤维增强水泥基复合材料（engineered cementitious composites, 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，随后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，然而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4.6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4.6的栓钉作为钢梁与ECC桥面板的剪力连接件.
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关键词:
- 桥梁工程 /
- 栓钉 /
- 推出试验 /
- 抗剪性能 /
- 纤维增强水泥基复合材料
Abstract: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 push-out 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 4.6, 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 4.6 are recommended to serve as a shear connector applied in steel-ECC bridge decks.
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Key words:
- bridge engineering /
- stud /
- push-out test /
- shear behavior /
- engineered cementitious composites
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图 4 试验件剖面图与栓钉的传力模式
Figure 4. Cross-section of specimen and mechanism of load transfer for studs
图 6 试验抗剪强度与现行规范预测值的对比
Figure 6. Comparison of test results of shear strength with value predicted by existing codes
图 13 ECC抗压强度对荷载-滑移曲线的影响
Figure 13. Effect of compressive strength of ECC on load-slip curves
图 14 ECC抗压性能对栓钉抗剪强度的影响
Figure 14. Effect of compressive properties of ECC on shear strength of studs
图 15 预测值与推出试验结果对比
Figure 15. Comparison of prediction results with push-out test results
图 16 栓钉抗拉强度对荷载-滑移曲线的影响
Figure 16. Effect of tensile strength of studs on load-slip curves
图 18 ECC抗压强度对栓钉抗剪刚度的影响
Figure 18. Effect of compressive strength of ECC on shear stiffness of studs
图 19 栓钉抗拉强度对其抗剪刚度的影响
Figure 19. Effect of tensile strength of studs on shear stiffness
表 1 试验件构造参数
Table 1. Geometric parameters of specimen
试验分组 hs/mm ds/mm 长径比 S-13 60 13 4.62 S-16 60 16 3.75 S-19 60 19 3.16 
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表 2 钢材基本力学性能
Table 2. Basic mechanical properties of steel
钢材类型 Es/GPa fy/MPa fu/MPa 钢梁 206 365 465 钢筋 206 405 536 栓钉 196 315 425
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表 3 推出试验结果
Table 3. Push-out test results
分组 ds/mm 长径比 承载力/kN 抗剪强度/MPa S-13 13 4.62 54.5 410.9 S-16 16 3.75 77.8 387.1 S-19 19 3.16 92.9 328.3
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