Flexural behavior of reinforced lightweight concrete beams under reversed cyclic loading

2014 ◽  
Vol 52 (3) ◽  
pp. 559-572
Author(s):  
Li-Kai Chien ◽  
Yi-Hao Kuo ◽  
Chung-Ho Huang ◽  
How-Ji Chen ◽  
Ping-Hu Cheng
Keyword(s):  
Cyclic Loading ◽  
Lightweight Concrete ◽  
Concrete Beams ◽  
Flexural Behavior ◽  
Reversed Cyclic Loading ◽  
Reversed Cyclic

scholarly journals Experimental Study on a Prefabricated Lightweight Concrete-Filled Steel Tubular Framework Composite Slab Structure Subjected to Reversed Cyclic Loading

2019 ◽  
Vol 9 (6) ◽  
pp. 1264 ◽  
Author(s):  
Jia Suizi ◽  
Cao Wanlin ◽  
Liu Zibin ◽  
Ding Wei ◽  
Su Yingnan
Keyword(s):  
Cyclic Loading ◽  
Bearing Capacity ◽  
Lightweight Concrete ◽  
Lateral Load ◽  
Dissipated Energy ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Reversed Cyclic Loading ◽  
Window Opening ◽  
Reversed Cyclic

A building structure comprising a prefabricated lightweight concrete-filled steel tubular (CFST) framework composite slab structure is proposed. Five full-scale specimens (i.e., one empty framework and four-walled frameworks) were tested under reversed cyclic loading to study their earthquake-resistance performance. Of the four wall specimens, three were walled using composite slabs, one had no openings, one had a window opening, and one had a door opening. One was walled with a concealed steel-truss slab. A comparative study on the strength, stiffness, ductility, hysteresis characteristics, and dissipated energy of the specimens was performed. The working mechanism of the framework and slab was then analyzed. The results show that, if reasonably assembled and connected, the framework and slab work in a well-coordinated manner. The walled framework had greater lateral load-bearing capacity, better energy-dissipation, greater stiffness reduction, and better deformability than an empty framework. The area and type of slab opening had a significant impact on structural performance because a door or window opening contributed to a smaller lateral load-bearing capacity and initial secant stiffness of the structure. However, this had no clear impact on the accumulative dissipated energy of the structure.

The effect of confinement on lap splices in reversed cyclic loading

1986 ◽  
Vol 13 (6) ◽  
pp. 681-692 ◽  
Author(s):  
B. Sparling ◽  
T. Rezansoff
Keyword(s):  
Reinforced Concrete ◽  
Cyclic Loading ◽  
Large Scale ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Damping Capacity ◽  
Reversed Cyclic Loading ◽  
Lap Splices ◽  
Large Scale Tests ◽  
Reversed Cyclic

Twelve large-scale tests (7 m beams with 30 mm main reinforcement) were made to investigate the performance of lap splices in reinforced concrete beams subjected to reversed cyclic loading which produced yielding in the main reinforcement. Load history and various configurations of splice confinement were the major parameters considered. Performance was judged on the basis of strength, ductility, and several degradation indicators.Behavior was dependent on the degree of splice confinement. Specimens containing superior splice confinement, provided either by closely spaced stirrups or by closely fitting spirals, were more ductile and sustained more load cycles, on average, prior to failure. It was advantageous to provide more splice confinement than the amount considered to be effective under static loading. Tensile splices designed with superior confinement according to proposed seismic specifications achieved ductility ratios (failure deflection divided by first yield deflection with no splice) which averaged 2.66.Reversed cyclic loading was more damaging than repeated unidirectional or monotonic loading. The number of reversed load cycles to failure decreased as the intensity of loading increased. Under load reversals, the reduction in stiffness, the increase in energy dissipation, and the gain in damping capacity were used to examine the degradation that could be sustained before failure. Key words: reinforced concrete, beams, bond, splices, cyclic loads, ductility, seismic design, joints, deflection, strength, stiffness, damping.

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