Aseismic Behavior of Concrete Filled Steel Tubular Columns (CFT)

9520277李为减少钢筋混凝土柱的损毁及防止其因强烈的多向地震动而倒塌，采用钢管混凝土柱是一个有吸引力的选择。1992年，美国国家科学基金会举办的美日复合材料和混合结构合作研究研讨会建议将钢管混凝土柱体系作为地震工程研究的四个重点研究领域之一。近年来，人们对圆形钢管混凝土试件进行了大量的反复加载试验。这些试验主要受到压缩和扭转的联合作用。结果表明，钢管混凝土构件具有较高的极限强度和较大的延性。该项目将通过分析和试验研究建立适当的数学模型，以量化钢管混凝土柱在循环荷载和地震荷载作用下的组合作用。在试验方案中，将同时考虑比例或体积效应和加载速率效应，在为期三年的后半段进行三维钢管混凝土柱体系的振动台试验。这是一个在民用基础设施系统(CIS)征集的第一年计划NSF 94-154下支持的项目。***

9520277 Lee To reduce the damages to reinforced concrete columns and to prevent their collapse due to strong multidirectional ground motions, the use of concrete filled tubular (CFT) columns is an attractive option. In 1992, an NSF Workshop for U.S. Japan Cooperative Research on Composite and Hybrid Structures recommended that the CFT column system be one of the four research areas to be emphasized in earthquake engineering research. In recent years a large number of cyclic loading tests on CFT specimens of the circular type has been conducted. These tests were primarily subjected to combined compression and torsion. Results showed that CFT members can deliver high ultimate strength with large ductility. This project will develop appropriate mathematical models through both analytical and experimental investigations to quantify the composite actions of CFT columns under cyclic and earthquake loading considerations. In the experimental program, the scale or volumetric effects and the loading rate effects will both be considered, shaking table tests of three-dimensional CFT columns system will be carried out during the second half of this three-year study. This is a project supported under the year 1 program of the Civil Infrastructure Systems (CIS) solicitation, NSF 94-154. ***