杆件内时模型在柱偏压问题中的应用

将内时思想方法用于杆件本构研究中，建立截面内时本构模型，并将其与杆件有限单元法相结合，建立一种新型杆件恢复力模型——杆件内时模型，重点讨论杆件偏压条件下截面综合内时的定义及杆件内时模型对该问题的适用性．单柱偏压算例表明杆件内时模型具有以下特点：加、卸载本构方程统一，编程简单；弹性到塑性之间逐渐过渡；考虑弹塑性沿杆长的分布，计算得到的分布规律更符合实际；处理复合受力问题具有优越性．对于型钢柱的单、双偏压问题，采用本文的杆件内时模型进行弹塑性分析是可行的；对于钢筋混凝土柱偏压问题，本文模型可以近似用于小偏压，为使模型更加符合实际，应进一步寻找能够反映大、小偏压特性的截面内时模型．

Member endochronic model for column under eccentric compression

Putting the endochronic thoughts into member constitutive researches, this paper constructs a section endochronic model. By combining it with member finite element method, a new member restoring force model member endochronic model is developed. With focus on columns under eccentric compression, it defines section synthetic intrinsic time and the feasibility of the new model to the situation. Examples of single columns under eccentric compression show that the member endochronic model has following features: unified constitutive equations during loading and unloading which simplifies computer programming of a gradual transition from elastic state to plastic state, considering the elasto plastic distribution along a member and the distribution style from calculation coinciding well with reality, having advantages in dealing with compound forces problem. In uniaxial and biaxial eccentric compression problems of steel columns,the model in this paper is feasible for elasto plastic analysis. In eccentric compression problems of reinforced concrete columns,the model can be used approximately in small eccentricity.For the sake of better coincidence with reality,however,one should try other section endochronic models,which can reflect both large and small eccentric compression features.