基于荷载试验的加固混凝土梁结构性能研究

Study on Structural Performance of Strengthened Concrete Beams Based on Load Tests

摘要: 为评估粘贴钢板加固技术对既有混凝土梁结构性能的提升效果，验证加固后梁体在变形控制与裂缝抑制方面的规范符合性，本文以某典型受弯混凝土梁为研究对象，开展了基于静力荷载试验的结构性能验证研究。首先依据《混凝土结构加固设计规范》(GB 50367-2013)设计并制作了粘贴钢板加固试件，明确了钢板规格、粘贴位置及锚固方式；随后采用分级加载方式，通过位移计及裂缝观测仪等设备，对梁体跨中挠度及裂缝开展情况进行全程监测，重点采集正常使用极限状态与设计组合工况状态下的关键数据。试验结果表明：准永久组合荷载作用下，梁跨中挠度为0.22 mm；设计组合荷载作用下，梁跨中挠度为0.91 mm，挠度均满足规范和计算限值要求，且未发现裂缝；研究结论可为高度相似条件的混凝土梁加固工程质量验收提供试验依据，也为粘贴钢板加固技术的工程应用可靠性评估补充了实测数据支撑。

Abstract: To evaluate the improvement effect of the steel plate bonding strengthening technology on the structural performance of existing concrete beams and verify the code compliance of the strengthened beams in terms of deformation control and crack suppression, this study took a typical flexural concrete beam as the research object and carried out a structural performance verification study based on static load tests. First, in accordance with Code for Design of Strengthening Concrete Structures (GB 50367-2013), steel plate-bonded strengthened specimens were designed and fabricated, with the steel plate specifications, bonding positions and anchorage methods clearly defined. Subsequently, a step-by-step loading method was adopted, and displacement meters, crack observation instruments and other equipment were used to monitor the mid-span deflection of the beam and the development of cracks throughout the process, with a focus on collecting key data under the serviceability limit state and the design combination load condition. The test results show that: under the quasi-permanent combined load, the mid-span deflection of the beam is 0.22 mm; under the design combined load, the mid-span deflection of the beam is 0.91 mm. Both deflections meet the requirements of code and calculation limits, and no cracks are found. The research conclusions can provide experimental basis for the design optimization and quality acceptance of similar concrete beam strengthening projects, and also supplement the measured data support for the reliability evaluation of the engineering application of the steel plate bonding strengthening technology.