杆内时模型初探

Research on Member Endochronic Model

对杆内时模型在描述杆恢复力特性方面的可行性及其特点进行了初步探讨.介绍了模型的建立过程及其数值计算方法,并针对双弯条件下的单柱讨论了模型中截面综合内时的定义.初步研究表明,杆内时模型适合于反复和复合受力杆的恢复力特性描述及结构弹塑性分析,与其他杆模型相比具有以下特点:弹性与塑性本构方程统一;加、卸载本构方程统一;模型中的所有参数可由各维单一受力条件完全确定,复合受力时则各塑性维之间自然耦合;分析过程适用于各种材料组成的杆.单柱在单弯和双弯条件下的算例表明,杆内时模型在描述杆单向弯曲和双向弯曲本构特性方面是合理、可行的.

The feasibility and features of member endochronic model on describing the internal restoring behavior were studied. Following an introduction of the main process of establishment and corresponding numerical methods to the model 9 the definition of section synthetic intrinsic time for a single column under biaxial bending was discussed. The elementary research reveals that the member endochronic model is applicable to describe restoring behavior of members under reverse and compound forces and can be well applied to structure elasto-plastic analysis. This model advantages obviously over the other ones, i.e., constitutive equations of elastic and plastic conditions are identical; constitutive equations of loading and unloading are identical; all of the model parameters can be determined according to each single force condition of the member section and the coupling effect between different section plastic dimensions can be obtained spontaneously for compound forces situation; and the analysis process is available to members made of various materials. Examples of column under uniaxial and biaxial bending demonstrate that the model can give a reasonable and feasible description of member restoring behavior under the above conditions.