Abstract
This paper presents an application of high strength concrete to concrete-encased composite frame building based on an experimental program. The work emphasized joints behavior under reverse cyclic loading caused by earthquakes to provide information for seismic design. To investigate the internal mechanisms and seismic performance, cyclic loading tests were carried out on five half-scale interior joints. Two design variables were addressed in the research: concrete strength and axial column load. Frame joints performance including crack pattern, failure mode, deformation, ductility, strain distribution, and energy dissipation capacity was investigated. It was found that all joint specimens behaved in a manner with joint panel shear failure. Using high strength concrete increased the joint strength and had relatively little effect on the stiffness and ductility. The axial column load helped the joint strength by better mobilizing the outer part of the joint, but it had an obvious influence on the ductility and energy-dissipating capacity, which can be improved by providing enough transverse reinforcement. A typical crack pattern was also provided which can well reflect mechanical character and damage process. This research should contribute to the future engineering applications of high strength concrete to concrete-encased composite structure.
Highlights
Concrete-encased composite structure, as a typical kind of composite structure, is defined as a construction in which both steel and concrete materials are effectively combined to maximize the structural and economic advantages of each material
Concrete-encased composite structure possesses a smaller sectional dimension, higher load-carrying capacity, and more excellent seismic behavior compared with reinforced concrete structures, which has been widely used in superhigh building structures and large-span structures especially in the US [1], China [2], and Japan [3]
The related experiments include concrete-encased steel composite beam to steel column joints [13], composite beam to concrete-filled steel tubular column joints [14], reinforced concrete beam-column joints strengthened with FRP systems [15], beam-column joints with recycled concrete aggregates [16], and steel reinforced concrete column-steel truss beam hybrid joints [17]
Summary
Concrete-encased composite structure, as a typical kind of composite structure, is defined as a construction in which both steel and concrete materials are effectively combined to maximize the structural and economic advantages of each material. One important research need aroused by the high strength concrete relates to beam-column joints. Influences of various factors on the joint behavior, such as different joint details, concrete strength, and axial column load, have been suggested as further research topics. This paper presents an experimental program on the behavior of composite joints with high strength concrete, under constant axial column compression and cyclic loads. The effects of high strength concrete and axial column load are studied through the following items: failure pattern, crack pattern, load-displacement curves, strain distribution, ductility capacity, and energy dissipation capacity. These results can be used to calibrate numerical models and to validate simplified methods included in codes
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