UHPC+CFRP加固10m空心板抗弯性能试验研究

Experimental Study on Flexural Behavior of 10-m Hollow Slab Strengthened with UHPC + CFRP

摘要:

为研究超高性能混凝土（UHPC）+碳纤维布（CFRP）组合加固空心板的抗弯性能，开展10 m足尺空心板试验研究，分析UHPC+CFRP组合加固后空心板破坏模式和承载力，并提出加固后空心板承载力简化计算方法。试验结果表明：UHPC与CFRP组合加固后空心板的变形能力提高，最终破坏形式为CFRP断裂、UHPC发生压溃，UHPC的抗压性能得到充分利用；UHPC+CFRP加固后试件承载力为1 926 kN·m，具有较高的安全性，CFRP破坏后试件仍可保持较久承载力，试件带裂缝工作时仍有较大安全余量；试件承载力的试验结果和理论计算结果较吻合，误差为7.6%，可为UHPC和CFRP组合加固混凝土桥梁设计计算提供参考。

Abstract:

In order to study the flexural behavior of hollow slabs strengthened with the combined ultra-high performance concrete (UHPC) + carbon fiber reinforced polymer (CFRP), a 10 m full-scale hollow slab test is carried out. The failure mode and bearing capacity of hollow slabs strengthened with the combined UHPC + CFRP are analyzed, and a simplified calculation method for the bearing capacity of hollow slabs after being strengthened is proposed. The test results show that the deformation capacity of the hollow slab is improved after being strengthened with the the combined UHPC and CFRP. The final failure mode is CFRP fracture and UHPC crushing, and the compressive performance of UHPC is fully utilized. The bearing capacity of the specimen after the combined UHPC + CFRP reinforcement is 1, 926 kN/m, which has the higher safety. After CFRP failure, the specimen can still maintain a long bearing capacity, and there is still a large safety margin when the specimen works with cracks. The test results of the bearing capacity of the specimens are in good agreement with the theoretical calculation results, and the error is 7.6 %, which can provide reference for the design and calculation of the concrete bridges strengthened with the combined UHPC and CFRP.