钢板加固受火后高强钢筋混凝土连续T形梁力学性能试验研究

发布时间：2018-07-12 19:59

本文选题：钢筋混凝土连续T形梁 + 高强钢筋　；参考：《建筑结构学报》2016年03期

【摘要】：对6个受火后高强钢筋混凝土连续T形梁试件分别采用粘贴钢板加固与螺栓锚接钢板加固,并研究其力学性能和破坏形态。结果表明:受火后高强钢筋混凝土连续T形梁粘贴钢板加固后,承载力提高39.1%~58.2%,破坏挠度降低17.8%~53.2%;采用螺栓锚接钢板加固后,承载力提高36.7%,破坏挠度仅下降4.4%。采用螺栓锚接钢板加固后,初始弯曲刚度与未受火对比试件相当;粘贴钢板加固后,初始弯曲刚度较未受火对比试件明显增大。距跨中越近,梁底钢板拉应变越大,应变变化梯度越大。受火后梁底粘贴一层钢板或螺栓锚接一层钢板加固后,位移延性系数提高53.4%~62.0%、能量延性系数提高62.6%~72.6%;受火后梁底和梁顶中支座附近各粘贴一层钢板加固后,其位移延性系数降低8.2%、能量延性系数降低7.2%。采用折算面积法计算钢板加固受火后高强钢筋混凝土连续T形梁的承载力误差为-0.2%~13.2%,符合工程精度要求。
[Abstract]:Six specimens of high strength reinforced concrete continuous T-shaped beams after fire were strengthened by sticking steel plate and bolted anchor steel plate respectively, and their mechanical properties and failure patterns were studied. The results show that after fire, the bearing capacity of high strength reinforced concrete continuous T-shaped beam is increased by 39.1% and 58.2%, and the damage deflection is reduced by 17.8% and 53.2%, and the bearing capacity is increased by 36.7% and the damage deflection is decreased only by 4.4% after strengthening with bolted steel plate. The initial bending stiffness of bolted steel plate is equivalent to that of unburned steel plate, and the initial bending stiffness of steel plate reinforced with steel plate is obviously higher than that of unburned steel plate. The closer it is to the middle span, the greater the tensile strain is and the bigger the strain gradient is. When a layer of steel plate or bolt anchor is attached to the bottom of the beam after the fire, the displacement ductility coefficient is increased by 53.42.0.The energy ductility coefficient is increased by 62.6and 72.6.The beam bottom and the middle support of the beam after the fire have been strengthened with a layer of steel plate, The displacement ductility coefficient decreases by 8.2 and the energy ductility coefficient decreases by 7.2. The calculation of bearing capacity error of high strength reinforced concrete continuous T-beam strengthened by steel plate is -0.2 and 13.23.2which accords with the requirement of engineering precision.
【作者单位】：东南大学建筑设计研究院有限公司;东南大学土木工程学院;上海市建筑科学研究院(集团)有限公司上海市工程结构安全重点实验室;
【基金】：上海市优秀技术带头人计划(15XD1522600) 上海市科委应用技术开发项目(2014-201)
【分类号】：TU375.1

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