Seismic Behavior and Design of High Performance Concrete- Filled Steel Tube Columns

高性能钢管混凝土柱的抗震性能与设计

• 批准号: 9632911
• 负责人: James Ricles
• 金额: $ 21万
• 依托单位: Lehigh University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-10-01 至 2000-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9632911&HistoricalAwards=false
• 关键词: Seismic; Behavior; Design; Performance; Concrete

One efficient means of composite construction is that which utilizes high performance concrete filled steel tube (CFT) columns. The filling of the tube increases the stiffness and strength and overcomes potential local instability of high strength steel tube. The tube confines the high strength concrete, increasing its ductility. The combined system has the attributes of high performance structural steel (speed of construction, strength, long-span capability, lightweight) and high performance concrete (stiffness, damping, economy), while using the tube as formwork. It is imperative in seismic resistant design that the members be properly proportioned and the structural system be well balanced. Currently there is a lack of knowledge of the seismic behavior of CFT columns. Rational guidelines for the seismic design of CFT composite construction are needed particularly when high performance concrete and high performance steel are used. This research focuses on basic behavior of CFT members with application to moment resisting and braced frames. The objectives are to: (1) study the load-deformation response of non-circular CFT columns composed of high strength concrete and steel under combined gravity and lateral seismic loading; (2) develop and calibrate a analytical models and computational methods based on experimental results for predicting the response of CFT columns under seismic loading conditions; and (3) develop design guidelines and recommendations for CFT columns constructed of high strength materials. The investigator will involve pursuing analytical and large-scale experimental investigations. Short CFT columns will be first studied, in which the effects of various design parameters on a member's force-deformation and moment-curvature-thrust relationship will be investigated. The results from the experimental studies will be utilizes to develop and calibrate various analytical models for predicting the response of a CFT to combined axial and flexural loading. These models will include design-oriented strength prediction equations and fiber-based formulations for capacity and overall force-deformation response prediction. The second part of the project will investigate the behavior of long CFT columns subjected to combined axial and lateral cyclic loading, considering the effects of the design parameters. Using the models a parametric study will be conducted to expand the experimental data base. The results will be used to formulate the design guidelines. The knowledge acquired and design guidelines developed will lead to the practical and reliable design of this form of construction as well as develop the use of high strength concrete and steel materials in seismic resistant design. This project also involves close collaboration with Japanese and Germany Universities which will enhance the quality of research. This is a project supported under the second-year program of NSF initiative `U.S.-Japan-Cooperative Research on Composite and Hybrid Structures,` NSF 94-154.

一种有效的组合施工方法是采用高性能钢管混凝土（CFT）柱。钢管的填充提高了钢管的刚度和强度，克服了高强钢管潜在的局部失稳。管围合高强度混凝土，增加其延展性。该组合体系采用钢管作为模板，同时具有高性能结构钢（施工速度、强度、大跨能力、轻量化）和高性能混凝土（刚度、阻尼、经济性）的特性。在抗震设计中，构件的合理配比和结构体系的平衡是至关重要的。目前，人们对CFT柱的抗震性能还缺乏认识。特别是在使用高性能混凝土和高性能钢材时，需要合理的CFT组合结构抗震设计准则。本文主要研究了CFT构件在抗弯矩和支撑框架中的基本性能。研究的目的是：(1)研究高强混凝土-钢结构非圆形CFT柱在重力和侧向地震联合作用下的荷载-变形响应；(2)建立基于试验结果的CFT柱地震响应预测分析模型和计算方法；(3)制定高强度材料CFT柱的设计指南和建议。研究者将进行分析性和大规模的实验调查。首先将研究短CFT柱，其中将研究各种设计参数对成员力-变形和弯矩-曲率-推力关系的影响。实验研究的结果将用于开发和校准各种分析模型，以预测CFT对轴向和弯曲组合载荷的响应。这些模型将包括面向设计的强度预测方程和基于纤维的容量和整体力-变形响应预测公式。该项目的第二部分将考虑设计参数的影响，研究长CFT柱在轴向和横向联合循环加载下的行为。利用这些模型进行参数化研究，以扩大实验数据库。研究结果将用于制定设计指南。所获得的知识和制定的设计指南将导致这种建筑形式的实用和可靠的设计，以及在抗震设计中开发高强度混凝土和钢材料的使用。该项目还涉及与日本和德国大学的密切合作，这将提高研究质量。本项目由美国国家科学基金会“美国科学研究”项目第二年资助-日本-复合材料与混合材料结构的合作研究，NSF 94-154。