¼Å¢Í§¡ÒÃàÊÃÔÁ¡íÒÅѧ´Ñ´´éÇÂÅǴẺäÁéÍÑ´áç·ÕèÁÕµèͤҹ¤Í¹¡ÃÕµÍÑ´áç ºÒ§ÊèǹÊíÒàÃç¨ÃÙ»

Effects of Flexural Strengthening with Non-Prestressed Wires on Precast Partially-Prestressed Concrete Beams

Name: ¨Ñ¡É´Ò ¸íÒçÇزÔ

Name: ÊÔ·¸ÔªÑ áʧÍÒ·ÔµÂì

Name: ¡Ãó ¤íÒÅ×Í

keyword: ¤Ò¹¤Í¹¡ÃÕµÍÑ´áçÊíÒàÃç¨ÃÙ»

; ÍÑ´áçºÒ§Êǹ

; àËÅç¡àÊÃÔÁẺäÁÍÑ´áç

; ¤ҴѪ¹ÕàËÅç¡àÊÃÔÁ

; ¤ÇÒÁà˹ÕÂÇ

; Precast concrete beam

; Partially-prestressed

; Non-prestressed reinforcement

; Reinforcement index

; Ductility

Abstract: This research is a part of a development project on precast concrete beams. The objectives of this paper are to study the structural behaviors, modes of failure and the effect of the reinforcement indexes and lengths of non-prestressed reinforcements on load capacity of the precast partially-prestressed concrete beams and to compare the obtained test results with those of the reference precast prestressed concrete beams. These two types of beams were designed according to the Engineering Institute of Thailand (EIT.) standard. In this study, the beam specimens have the cross-sectional dimensions of 0.15 x 0.30 meters with the span length of 3.00 meters. Five reinforcement indices and three lengths of non-prestressed wires were used in this study. The totals of thirteen specimens were tested under four-points loading test. From the tests, it was found that the specimens have linear behavior up to 60 - 70% of their maximum load capacity. Then, the behavior of the specimens is nonlinear until failure. In addition, the results indicate that the ultimate capacities and ductility of the beams were increased with both the reinforcement index and lengths of non-prestressed wires were increased. Finally, based on the results obtained from this study, the design equation for the precast partially-prestressed concrete beams flexurally reinforced with non-prestressed PC wires was proposed

Abstract: §Ò¹ÇԨѹÕéà»¹Êǹ˹Ö觢ͧâ¤Ã§¡ÒþѲ¹Ò¤Ò¹¤Í¹¡ÃÕµÊíÒàÃç¨Ã»Ù â´ÂÁÕÇѵ¶Ø»ÃÐʧ¤à¾×èÍÈÖ¡ÉҾĵԡÃÃÁ ·Ò§â¤Ã§ÊÃÒ§ ÅѡɳСÒÃÇÔºÑµÔ ¤ҴѪ¹ÕàËÅç¡àÊÃÔÁáÅФÇÒÁÂÒǢͧÅǴẺäÁÍÑ´áç·ÕèÁռŵÍ¡íÒÅѧ ÃѺáç¢Í§¤Ò¹¤Í¹¡ÃÕµÍÑ´áçºÒ§ÊǹÊíÒàÃç¨ÃÙ» µÅÍ´¨¹¹íҼšÒ÷´Êͺ·Õèä´à»ÃÕºà·Õº¡Ñº ¤Ò¹¤Í¹¡ÃÕµÍÑ´áçÊíÒàÃç¨ÃÙ»ÍÒ§ÍÔ§ ¤Ò¹·Ñé§Êͧª¹Ô´ä´ÃѺ¡ÒÃÍ͡ẺµÒÁÁҵðҹ¢Í§ÇÔÈÇ¡ÃÃÁ ʶҹáË§»ÃÐà·Èä·Â (ÇÊ·.) µÑÇÍÂÒ§¤Ò¹ã¹§Ò¹ÇÔ¨ÑÂà»¹¤Ò¹·ÕèÁÕ¢¹Ò´Ë¹ҵѴ¡ÇÒ§ 0.15 àÁµÃ ÅÖ¡ 0.30 àÁµÃ áÅÐÁÕÃÐÂÐËÒ§ÃÐËÇÒ§¨Ø´ÃͧÃѺ 3.00 àÁµÃ â´ÂÁÕ¤ҴѪ¹ÕàËÅç¡àÊÃÔÁ¢Í§ÅÇ´ ẺäÁÍÑ´áç 5 ¤Ò áÅФÇÒÁÂÒǢͧÅǴẺäÁÍÑ´áç 3 ¤Ò µÑÇÍÂÒ§·´Êͺ¨íҹǹ 13 µÑÇÍÂÒ§ ¶Ù¡·´Êͺâ´Âáç¡ÃзíÒẺ 4 ¨Ø´ ¨Ò¡¡Ò÷´Êͺ¾ºÇÒ ªǧááµÑÇÍÂÒ§ÁվĵԡÃÃÁÃѺáç ẺàªÔ§àÊ¹¶Ö§¤Ò»ÃÐÁÒ³ 60 - 70% ¢Í§¡íÒÅѧÃѺáçÊÙ§ÊØ´ ¨Ò¡¹Ñé¹µÑÇÍÂÒ§·´Êͺ¨ÐàÃÔèÁÁվĵԡÃÃÁ ẺäÃàªÔ§àÊ鹡ÒÃáÍ¹µÑÇáÅÐÃÍÂÃÒǢͧ¤Ò¹ÁÕ¤èÒà¾ÔèÁ¢Öé¹ÍÂÒ§ÃÇ´àÃçǨ¹¡ÃзÑè§à¡Ô´¡ÒÃÇԺѵԹ͡¨Ò¡¹Õé Âѧ¾ºÇÒ ¤ÇÒÁÊÒÁÒö㹡ÒÃÃѺáç»ÃÐÅÑÂáÅФÒ¤ÇÒÁà˹ÕÂǢͧ¤Ò¹ÁÕá¹Çâ¹Áà¾ÔèÁ¢Öé¹ àÁ×èͤҴѪ¹Õ àËÅç¡àÊÃÔÁáÅФÇÒÁÂÒǢͧÅǴẺäÁÍÑ´áçÁÕ¤Òà¾ÔèÁ¢Öé¹ ÊØ´·ÒÂÊÁ¡ÒÃÍ͡Ẻ¤Ò¹¤Í¹¡ÃÕµÍÑ´áç ºÒ§Êǹ·Õè¶Ù¡àÊÃÔÁ´ÇÂÅǴẺäÁÍÑ´áçä´¶Ù¡¹íÒàʹÍÀÒÂãµ¢Íºà¢µ·Õèãª㹡ÒÃÈÖ¡ÉÒ

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Address: ¹¤ÃÃÒªÊÕÁÒ

Email: kitiya.ni@rmuti.ac.th

Created: 2557

Modified: 2025-06-18

Issued: 2560-05-11

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ISBN: 1906-215X

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