基于地震塑性损伤的混凝土框架结构分析模型研究

STUDY ON PLASTIC-DAMAGE SEISMIC MODEL FOR REINFORCED CONCRETE FRAMES

采用经典塑性和连续损伤模型,确定了塑性变形的演化法则,发展了一种基于抗震损伤的混凝土框架结构分析模型。运用两端具有塑性铰的梁模型模拟框架结构的梁柱。算例表明,该模型的损伤指数可以确定结构各单元和整体在地震时的性能及结构极限荷载,具有可靠的精度。

A plastic-damage model for reinforced concrete frames was developed based on the classical plastic model and the continuum damage model.The plastic-damage constitutive law was implemented into a beam model for framed structures,in which these were described by elastic beams and columns with two inelastic hinges at their ends.A damage index useful in evaluating the state of structural members and a meaningful global damage index for whole structure were introduced.The plastic-damage model,together with the member and global damage indices,were adequate for the computation of the limit load of reinforced concrete frames subjected to seismic actions.Examples of applications of the methodology to the non-linear analysis of reinforced concrete framed structures were finally given.The result indicates that the model has reliable accuracy.