大跨、高层结构动力弹塑性和倒塌分析(Ⅱ):纤维程序UMAT原理与开发

Dynamic elastic-plasticity and collapse analysis for large-span and high-rise structure(Ⅱ) : theory and development of fiber-data program UMAT

简要回顾并论述钢材、无约束混凝土和受约束混凝土的本构骨架曲线特征参数与理论公式,主要介绍箍筋和钢管对混凝土约束效应的计算方法,并给出关于箍筋配筋率以及极限与峰值应变关系的处理依据的说明,进而开发并实现了纤维数据的可视化生成程序UMAT,可生成钢筋混凝土、型钢混凝土以及钢管混凝土等常用截面形式的纤维数据。最后,利用UMAT给出了两个典型构件截面纤维数据的操作流程。结果表明UMAT程序可为采用MSC.MARC软件进行结构的动力弹塑性和倒塌分析提供便利。

The constitutive skeleton curve characteristic parameters and theoretical formula models of steel, unconfined concrete and confined concrete were firstly reviewed and discussed in brief. Then, for the confined concrete, the calculating methods of the confinement effects of the stirrups and steel pipe on concrete were introduced and the processing instructions of the stirrup reinforcement ratio and the relationship between limitation and peak strain were given to give a birth to a visual program UMAT for material fiber-data. By using the UMAT, the fiber data output of several types of material sections such as the reinforced concrete, steel reinforced concrete, steel pipe concrete and so on can be operated. At last, the flow diagram of the fiber data of two type of typical frame section were further given. The results show that the program UMAT can provide convenience for structural dynamic elastic-plastic and collapse calculations when using MSC. MARC software.