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Technical Information
Mechanical Splicing
Moment BarBreak Coupler
BarBreak Connection Splice
Seismic Design
Post Tensioning
Control Permeability Formwork (CPF)
In recent years, the demand for efficient splicing systems have become increasingly important as a result of increased construction complexities, design requirements escalating costs and limitations to traditional lap splicing methods, the need for alternatives that provide both structural reliability and cost effectiveness has never been more apparent.
In the shadows of Earthquakes and man-
Ever since the Dec 26 (2004) earthquakes that struck Acheh, Malaysia has been exposed to the stark reality that we can no longer be considered immune to such disasters of catastrophic proportions in term of lives lost, property destruction and even economy collapse. Malaysia may not be directly in any demarcated seismic zones, but the harsh awakening of “ripples effect” from tremors at close proximit
indeed signifies earthquake risks could no longer be ignored. The government and regulatory bodies have since taken serious steps in reviewing current building regulations and codes, so too must structural engineers and constructors take immediate necessary precautions to ensure the safety of their design as they are liable if anything happened to the buildings. (see STAR press release 17/2/05 on page 8)
Foreword
Moment BarBreak Mechanical Splicing System
To understand the structural advantages of a mechanical connection over lap splices, it is imperative that we study the load transfer mechanism and its capabilities. Figures 1 & 2 show the load transverse mechanism of the lap splice and its dependence on the bond to the surrounding concrete. Performance of lap splice is only defined up to the yield point of the reinforcing bar, beyond this point, the lap splice do not exhibit a consistent ductile pattern.
‘Barbreak’ Mechanical Connection Versus Lap Splice
Fig 1
Fig 2
Load transfer mechanism of lap splice is dependent on the surrounding concrete causing significant forces to occur within the concrete that may require additional transverse reinforcement in the lap zone to prevent excessive cracking. Free ends of splice bars act as crack inducers across the tension zone causing transverse cracks which in turn triggers splitting cracks in the concrete.