Earthquake-Resistant RC Frames with High-Strength Concrete and Yielding Columns

9320150 Sozen本项目将研究两个参数对框架响应的影响：（a）高强度混凝土和（B）柱屈服。物理数据来支持目前存在的高强度混凝土和柱屈服的影响的假设缺乏。虽然这两个参数是不同的类（一个是材料性能，另一个是设计选项），缺乏一般的理论理解，在任何情况下，导致相同的效果，在钢筋混凝土建筑抗震设计的限制选择。 建议的10个试验样本的钢筋柱梁组件的设计，以捕捉钢筋混凝土框架响应地震激励的基本特征，主要是在平面的框架。 将选择尺寸、材料和加载速率，以在实验设施的限制范围内将尺度效应降至最低。 实验变量为（1）混凝土强度，标称值为5，000和10，000 psi;（2）柱中的轴向单位应力，850和1700 psi或“平衡荷载”的一半;（3）屈服位置，柱中或梁中。 研究的目的是：（1）直接得出试验变量影响的结论;（2）利用调查数据对现有的滞回算法进行测试;（3）必要时，开发新的滞回算法，以反映柱、梁和节点的观测变形;（4）确定试验或开发的滞回算法的可靠适用范围：（5）混凝土强度和柱屈服对框架反应影响的参数研究，作为开发简单设计程序的基础;（6）设计程序的建议，并规定适用范围。 ***

9320150 Sozen This project will investigate the effect on frame response of two parameters: (a) high-strength concrete and (b) column yielding. Physical data to support the currently existing hypotheses about the effects of high strength concrete and column yielding are lacking. Although the two parameters are of different classes (one a material property and the other a design option), lack of general theoretical understanding in either case leads to the same effect of constricting choices in earthquake-resistant design of reinforced concrete buildings. The proposed ten test specimens of reinforced column-girder assemblies have been designed to capture the essential features of reinforced concrete frames responding to earthquake excitation primarily in the plane of the frame. Sizes, materials, and loading rates will be selected to reduce scale effects to a minimum within the limits of the experimental facilities. The experimental variables are (1) Concrete strength, nominally 5,000 and 10, 000 psi; (2) axial unit stress in column, 850 and 1700 psi or one half of "balanced load", and (3) location of yielding, in the column or in the girder. The research is expected to provide: (1) direct conclusions about the effects of the test variables; (2) testing of the currently available hysteresis algorithms using the data from the investigation; (3) development, if necessary, of new hysteresis algorithms to reflect the observed deformations of the column, the girder, and the joint; (4) definition of the domains of confident applicability for the hysteresis algorithms tested or developed; (5) parametric studies of the effects of concrete strength and column yielding on frame response to serve as the base for development of simple design procedures; (6) recommendations of design procedures with defined limits of applicability. ***