本文在用有限元程序对结构进行内力计算和配筋验算的基础上,通过模态分析得到的结构各阶振型和频率,结合新旧规范对结构抗力和构造措施等方面要求的差异,分析了引起结构开裂和承载力不足的原因,并对其裂缝形态和形成机理进行了论述,最后通过粘贴碳纤维布对结构构件进行了加固补强,使之满足现有荷载状况下的安全使用要求。该加固设计可供类似工程参考。 Based on the internal force calculation and reinforcement checking of the structure by the finite element program, this paper analyzes the vibration modes and frequencies of the structures obtained from the modal analysis, and analyzes the difference between the new and old codes on structural resistance and structural measures. Which leads to the cause of structural cracking and insufficient bearing capacity. The fracture morphology and formation mechanism are also discussed. Finally, the structural members are reinforced and bonded with carbon fiber cloth to meet the requirements of safe use under the existing load conditions. The reinforcement design is available for similar engineering references.