Research Initiation: Effects of Sustained Load on the Performance of Reinforced Concrete Columns During Earthquakes

该项目的目标是：量化混凝土柱由于徐变变形引起的应力传递过程，(2)确定柱纵向钢筋在持续轴向荷载作用下是否会屈服，(3)确定柱横向强度、刚度和变形性的变化，以及(4)确定轴向荷载、持续轴向荷载的影响，(3)确定柱横向强度、刚度和变形性的变化。(4)确定轴向荷载、持续荷载周期和材料特性对柱在水平荷载作用下反应的影响。由多对梁柱组件组成的实验室试件将在水平载荷试验之前承受持续的轴向载荷。将开发一个计算机化的非线性模型来模拟柱的行为，包括材料特性的真实表示，横向配筋的影响，以及蠕变效应。这是一项研究启动奖，旨在开发一种计算方法，用于评估持续荷载对混凝土柱完整性的影响。使用该模型将允许用户定义旧混凝土柱的强度、刚度和变形极限。

The objectives of this project are: to quantify the stress-transfer process in concrete columns due to creep deformations, (2) to determine if column longitudinal reinforcement can yield under the action of sustained axial loads, (3) to identify changes in column lateral strength, stiffness, and deformability, and (4) to define the influence of axial load, sustained axial loads, (3) to identify changes in column lateral strength, stiffness, and deformability, and (4) to define the influence of axial load, sustained load period, and material properties on column response to lateral loads. Laboratory specimens, comprising pairs of beam-column subassemblages will be subjected to a sustained axial load prior to the lateral load tests. A computerized nonlinear model will be developed to simulate the behavior of the columns including realistic representation of material properties, effect of transverse reinforcement, and creep effects. This is a research initiation award to develop a computational method for assessing the effect of sustained loads on the integrity of concrete columns. Use of the model will allow the user to define the strength, stiffness, and deformation limits of old concrete columns.