NUMERICAL STUDY ON COLUMN-PEDESTAL CONNECTION OF COLD-FORMED PORTAL FRAMES SUBJECTED LATERAL AND AXIAL LOADING
Cold-formed steel portal frame is a type of building that has been developing in Indonesia, but there is a lack of study to evaluate column and pedestal connections. Cold-formed steel has a relatively low thickness which allows buckling to occur before it reaches yielding stress when subjected to ax...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/22526 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Cold-formed steel portal frame is a type of building that has been developing in Indonesia, but there is a lack of study to evaluate column and pedestal connections. Cold-formed steel has a relatively low thickness which allows buckling to occur before it reaches yielding stress when subjected to axial, shear or moment force. This limitation can reduce the strengh of steel significantly. <br />
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In this study, a prototype of portal frames was planned and designed base on SNI 7971:2013 to obtain section columns of cold-formed steel being examined. After that, the performance of the connection system of cold-formed portal frame against lateral and axial load was investigated, by studying the load of cold-formed steel that have been planned as high as 1.6 m. Structural modeling and analysis was carried out using the non-linear finite element program ABAQUS 6.14. Indicators used in determining failure are buckling, yielding and deformation. <br />
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The result showed that cold-formed steel columns were influenced by axial load because when excessive axial was applied to the column, it resulted local buckling. Meanwhile, the base cleats was influenced by lateral loads as it causes the base cleats to be lifted up, having stress concentrations in the pedestal bolt hole that can cause yielding. Axial and lateral loading configuration can be taken into consideration to maintain the stability and performance of the connection system of cold-formed portal frame. By applying smaller axial loading with larger lateral loading causes the base cleats to lift up and cause excessive drift. In other hand, larger axial loading and smaller lateral loads will cause drift to decrease but also cause early yielding due to buckling in the base cleats. <br />
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The next study was carried out by adding stuffener to the connection system. Base cleats using stiffener can improve stiffness and reduce excessive drift due to lateral loads provided. However, connection system using base cleats with stiffener have a deficiency that causes the location of the yielding failure in base cleats to have buckle failure in the column, which can be very dangerous in the event of a sudden collapse |
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