RC框架连续倒塌抗力优化的混合设计算法研究

STUDY ON THE HYBRID DESIGN METHOD FOR OPTIMIZING THE PROGRESSIVE COLLAPSE RESISTANCE OF RC FRAME STRUCTURES

  • 摘要: 抗连续倒塌设计对于提高结构在偶然荷载作用下的鲁棒性至关重要,现有设计规范中多推荐采用拆除构件法。其中,非线性动力拆除构件法通过模拟结构在构件拆除后的响应,依照规范要求调整配筋,使结构满足设计要求,该方法计算精确,但需要开展大量非线性动力拆除构件分析。近年来,深度学习在工程问题中的应用愈加广泛,通过学习样本数据的内在规律,可以提取结构特征以预测结构的拆除构件响应。该文结合深度学习和粒子群优化算法提出了一种可用于RC框架结构抗连续倒塌设计的混合设计算法。构建了用于刻画结构连续倒塌抗力的配筋特征图,分别采用机器学习和深度学习方法搭建了基于特征图获取结构连续倒塌响应的预测模型,连接粒子群优化算法实现了基于混合算法的RC框架抗连续倒塌优化设计。在此基础上,以某4层RC框架结构为例,将设计结果与基于有限元方法计算的结果进行比较,验证了混合设计算法的可行性和准确性。

     

    Abstract: The incorporation of progressive collapse design is crucial to improve the resistance of structures against accidental local loads. Among current design codes, the alternative path (AP) method is often recommended. In which, the nonlinear dynamic AP method first simulates the structural responses after the component removal, then the reinforcement within the connected components is adjusted based on the simulated responses and the code requirements to ensure the safety of the structure. Compared with other AP methods, the nonlinear dynamic AP method is accurate in calculation but requires a large number of nonlinear dynamic AP analyses. In recent years, deep learning has been widely used in solving engineering problems. By learning the inherent laws of sample data, deep learning can extract the structural features and predict the structural response under component removal scenarios. In this study, a hybrid design algorithm for the progressive collapse design of reinforced concrete (RC) frame structures was proposed by combining deep learning and particle swarm optimization. The reinforcement feature map was constructed to depict the structural progressive collapse resistance. Machine learning and deep learning were respectively employed to develop the prediction models to estimate the structural progressive collapse responses based on the feature maps. The particle swarm optimization (PSO) algorithm was combined with the prediction models to optimize the progressive collapse design of RC frame. On this basis, a 4-story RC frame structure was taken as an example, and the design results were compared with those calculated based on the finite element (FE) method to verify the feasibility and accuracy of the hybrid design algorithm.

     

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