Hysteresis of RC Columns Subjected to Bilateral Loading

本研究旨在研究具有不同破坏模式的钢筋混凝土柱在双边荷载作用下的受力情况。研究大纲如下。1)弯曲、弯剪或剪切模式的RC柱试件的双边加载试验，在另一个侧向和轴向的恒定载荷下，以循环加载（对于弯曲或弯剪模式）或单调加载（对于剪切模式）的方式加载到一个侧向。试验结果表明，塑性流动规律可以有效地描述任意破坏模式下钢筋混凝土柱双侧变形的相互作用。2)二维退化三线性模型是现有的双侧荷载下受弯柱的滞回模型，即使在强度劣化范围内，也能很好地模拟受弯或弯剪试件的实测响应。3)利用流动规律，将面向原点的模型从一个方向扩展到两个方向，提出了一种新的面向原点的二维迟滞模型，并证明了该模型能很好地模拟剪切试件的典型观测结果。

It was intended in this research to study RC columns with various failure modes subjected to bilateral loading. The outline of the studies is as follows.1) Bilateral loading tests of RC column specimens with a flexure, flexure-shear or shear mode were conducted in such manner that they were cyclically (for a flexure or flexure-shear mode) or monotonically (for shear mode) loaded to one lateral direction under the constant loads for the other lateral and axial ddirections. The tests hav revealed so-called flow rule in plasticity is effective to represent the interaction of bilateral deformation of RC columns with any failure mode.2) The two-dimensional Degrading Trilinear Model, which is an existing hysteresis model for flexural columns subjected to bilateral loading, proved to well simulate the observed response of the flexure or flexure-shear specimens even in the range of strength deterioration.3) An hysteresis model for the shear specimens, two-dimensional Origin-Oriented Model, was newly proposed by extending the Origin-Oriented Model in one direction to two directions using the flow rule, and proved to well simulate the typical observations of the shear specimens.