Seismic Behavior of Simcon-Jacketed High Strength Lightweight Aggregate Fiber Reinforced Concrete Filled Steel Tube Column Members

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Title: Seismic Behavior of Simcon-Jacketed High Strength Lightweight Aggregate Fiber Reinforced Concrete Filled Steel Tube Column Members
Author: Brezac, Boris
Advisors: Neven Krstulovic-Opara, Committee Chair
Abstract: Earthquake resistant structures and structures deteriorated due to earthquake and lack of durability inspired engineers to develop novel structural systems. During the recent decades advanced fiber reinforced cementitious composites such as High-Performance Fiber Reinforced Concretes (HPFRCs) have been developed. These innovative composite materials exhibit behavior not attainable with conventional concrete materials, such as high compressive and tensile strength, as well as ductility, which lead to a significant increase in the ability of the structure to dissipate energy. These properties are particularly desirable seismic resistant design. However, existing procedures for design, detailing and construction of reinforced concrete frames are not well suited for cost-effective construction with HPFRCs because HPFRCs are substantially different from conventional concrete materials. The structural system consisted of partially precast High Performance Composite Frames (HPCFs) has been investigated to address these issues in this National Science Foundation project. Such a composite frame is made by selectively using Slurry Infiltrated Mat Concrete (SIMCON), Slurry Infiltrated Fiber Concrete (SIFCON), and High Strength - Lightweight Aggregate Fiber Reinforced Concrete (HS-LWA FRC). The objective is to increase the overall seismic resistance and simplify the post-earthquake retrofit procedures, while at the same time minimizing the cost by simplifying the construction procedure and increasing the speed of construction. This thesis presents the development, testing and behavior of an integral part of this innovative approach to earthquake resistant structures. HS-LWA FRC encased in steel tube allows for both improved seismic resistance and possibly more cost-effective method of construction than in conventional structures. The use of SIMCON jacket for HS-LWA FRC filled steel tube column member enhances the seismic behavior of the column, as well as it increases the durability and fire resistance of such a column member. SIMCON jacket provides additional energy dissipation under extreme earthquake loading and because of the fiber mat feature of SIMCON, used and deteriorated SIMCON jacket can be relatively easily replaced after the end of earthquake loading. Main objective of this research was to manufacture, test and analyze the seismic behavior of the SIMCON jacketed HS-LWA FRC filled steel tube column member, as well as compare its behavior and performance to HS-LWA FRC filled steel tube column member. The SIMCON jacketed HS-LWA FRC filled steel tube column was tested under static-reversed cyclic loading. A cantilever type setup was used in this investigation and the column specimen was tested in pure bending. Ductility, stiffness degradation, energy dissipation, work index, damage index and hysteretic damping ratio were examined. The specimen dissipated large amount of energy and quite satisfactory level of ductility was reached. Testing of the SIMCON jacketed HS-LWA FRC filled steel tube column showed that increase in strength, story drift ratio and dissipated energy was developed comparing to HS-LWA FRC filled steel tube column. SIMCON jacket postponed the outwards buckling of the steel tube.
Date: 2002-07-15
Degree: MS
Discipline: Civil Engineering
URI: http://www.lib.ncsu.edu/resolver/1840.16/2762


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