輕質粒料混凝土鋼承版之載重行為與強度

Load Behavior and Strength of Lightweight Aggregate Concrete Slab with Steel Decking

林聖雄(Sheng-Shiung Lin)

指導教授 ： 干裕成

朝陽科技大學/理工學院/營建工程系/碩士(2011年)

摘要

本文以水庫淤泥燒製之輕質粒料，製作輕質與常重兩種混凝土複合鋼承版，進行四點彎曲載重詴驗，載重剪跨取a=3H、4H及5H三種。鋼承版頂面另外加設剪力螺釘，其間距分15cm、30cm及不設剪力螺釘(控制組)三種。 詴驗結果顯示，複合鋼承版載重後，達到第一尖峰載重時，載重將陡降，然後在緩慢回升，其最後承載力甚至會超過第一尖峰載重。承受相同載重下，剪跨愈大者其承載力愈低。加設螺釘之鋼承版，其破壞過程不同於無螺釘者，螺釘間距越小，尖峰載重的下降幅度越小，顯示螺釘加固，可有效提升混凝土鋼承版之承載力及韌性。實務上考量，依工作應力法以第一尖峰載重評估複合鋼承版之極限承載力，可符合設計需求；而依本研究結果，其偏差係數在19%以下。

關鍵字

載重－變位 ； 尖峰載重 ； 輕質混凝土 ； 複合鋼承版

並列摘要

In this study, four-point loading tests were conducted on both lightweight and normal-weight concrete composite steel decks. The lightweight aggregate, was made from reservoir sediment. Three kind of loading shear span, a=3H, 4H and 5H, were selected in this tests. The shear screw was additionally added to the top side of steel deck with spacing’s of 15cm and 30cm.Test result shows that the load of composite steel deck drops sharply when reaching the first peak load, then, rising gradually. Its final load capacity can be even over the first peak load. Under the same loading, the higher value of shear span gets the lower value of load capacity. The destruction process of steel deck with additional shear screw is different from that without shear screw. The smaller sapcing of shear screw is, the smaller descending range of peak load will be. It indicates that with the shear screw, the capacity and ductility of concrete steel deck increases efficiently. For practical consideration, according to working stress method, the ultimate capacity of composite steel deck evaluated by the first peak load is workable. Its result shows a deviation of under 19%.

並列關鍵字

load-deflection ； peak load ； lightweight concrete ； composite steel deck

參考文獻

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