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高强混凝土梁受拉底面粘贴补强纤维布后,延性降低显著。为提高补强梁的综合性能,利用四点弯曲梁静载试验,在补强加固梁梁端及跨中实施不同的锚固方式,对比不同锚固组合下加固梁的强度和延性。研究表明:端部U锚能改善加固梁破坏模式,提高加固梁的延性和强度及补强纤维布的利用率。端部U锚联合跨中全包锚固能进一步提高加固梁的延性,显著提高补强纤维布的利用率,且能平衡变形性和承载力在安全储备中的比重;在补强纤维布断裂后,能有效限制补强纤维布的剥离和滑移,继续发挥补强作用,使加固梁延性和强度得以恢复;能对包裹区混凝土产生约束作用,提高混凝土的延性。因此端部U锚联合跨中全包锚固是合理且有充分安全储备的锚固方式。
High-strength concrete beam tension-pull the bottom of the surface paste reinforcement fabric, ductility decreased significantly. In order to improve the comprehensive performance of the reinforced beam, the four-point bending beam static load test was used to carry out different anchoring methods on the beam ends and spans of reinforced concrete beams. The strength and ductility of the reinforced beams under different anchorage combinations were compared. The results show that the U-tip can improve the failure mode of the reinforced beam, enhance the ductility and strength of the reinforced beam, and enhance the utilization rate of the fiber cloth. The combination of the end U-anchor and the mid-span all-inclusive anchorage can further improve the ductility of the reinforced beam, significantly improve the utilization ratio of the reinforcing fiber cloth and balance the deformability and the specific gravity of the bearing capacity in the safety reserve. After the reinforcing fiber cloth is fractured , Can effectively limit the stripping and slippage of reinforcing fiber cloth, continue to play a reinforcing effect, so that the ductility and strength of the reinforcing beam can be restored; the restraining effect can be generated on the concrete in the wrapping zone to improve the ductility of the concrete. Therefore, the combination of end U anchors and mid-span all-inclusive anchoring is a reasonable and adequate safety anchorage.