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Title: Seismic performance of beam bar anchorage in exterior reinforced concrete beam-column joint
Authors: Nancy Permatasari Widjaja
Keywords: DRNTU::Engineering::Civil engineering::Structures and design
Issue Date: 2009
Abstract: Being in proximity of subduction zones, Indonesia region is very vulnerable to earthquake disruption. Earthquake wave interruptions are recorded every minute proving how active the movement of earth tectonic plates around Indonesia is. Many cases of earthquake tremors have been countlessly noted in Indonesian history, including the recent ones: Bengkulu earthquake in 2007, Yogyakarta earthquake 2006, and the indisregarded massive Tsunami disaster in 2004. Lots of casualties, damaged infrastructures and million dollars have lost due to the catastrophe. There has to be preventive actions be taken to avoid future loss. Better building design has been a way to solve the problem. Understanding that building is one of the core human physical needs, many building in Indonesia are still constructed from bare masonry structures without any reinforcements or even from timber framing which will, even under low seismic loading, experience unavoidable severe collapse. This project would like to assess the seismic performance of the new Indonesian building design code (SNI 03-2847-2002), particularly on its design on beam-column connections. Performances of 3 other different proposed design specimens have also been assessed under seismic loading. All specimens were identical, and they varied in the type of steel bar used for beam longitudinal reinforcements, namely plain and deformed bars, and in the anchorage detailing, either anchored into beam stub or bent into the column. From the analysis results, it shows that the specimens with beam stub performed better over those without one. This is from the understanding of the provision of bare concrete still much available extended from joint due to the beam stub that can supply more support for the development of complete diagonal support mechanism. Without beam stub, the concrete covering the joint at the far face of the column will normally spall off thus having no effect on developing complete joint strut action. The result also showed that bar slip phenomenon occurred at the specimens with plain longitudinal reinforcement bars resulting in high pinching behaviour at the load-displacement hysteresis loops. While in the case of specimens with deformed bar, having higher yield strength and better grip for improved bond strength, higher overall strength could be attained while maintaining same ductility level. This may due to the relatively small size of the specimens that can reduce the possibility of shear crack along the beam-column elements, and may therefore greatly reduced significant failure and ductility capacity reduction often encountered at specimens with relatively bigger sizes. It is then concluded from the result that new Indonesian building design code may still be applied for practice, since its performance under seismic loading in the test had been the best among others. Further research on beam-column connections tested under reversed cyclic loading still need to be assessed, especially those with the use of beam stub, with other anchorage detailing and perhaps those with relatively small size, noting that researches available on the aforementioned subjects are still rather limited.
Rights: Nanyang Technological University
Fulltext Permission: restricted
Fulltext Availability: With Fulltext
Appears in Collections:CEE Student Reports (FYP/IA/PA/PI)

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