Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/13081
標題: 低水泥量高性能混凝土樑之撓曲行為
Flexural Behavior of Low cement High Performance Concrete Beam
作者: 張福昌
Zhang, Fuh-chang
關鍵字: Low cwment;低水泥;HPC;flexural;ductility;beam;撓曲;延展性;高性能混凝土
出版社: 土木工程學系
摘要: 
本文製作A、B兩系列實尺寸的高性能混凝土(HPC)樑,其水泥含量為A
系列250kg/m3、B系列350kg/m3,所有樑試體的混凝土工作度要求為坍度
(Slump) > 20cm及流度 (Slump flow) > 60cm 。研究上依變化拉力鋼筋
含量、壓力鋼筋含量及箍筋間距進行撓曲試驗,期對HPC樑試體的延展性
與彎曲強度有所了解。在實驗過程中除詳細觀察試體的破壞模式外,並依
所設定變數測取撓曲應變值,以求試體之各項性質。 試驗結果發現
,以ACI等值矩形應力塊分析所得撓曲強度,對高強度HPC樑而言將偏於保
守。增加拉力鋼筋含量可提昇HPC樑的彎矩容量,但卻會使其延展性下降
。壓力鋼筋有助於延展性的提昇,但須在拉力鋼筋影響小於壓力鋼筋的前
提下。箍筋間距加大會造成延展性降低,同時會使壓力鋼筋容易挫屈。56
天之HPC圓柱試體極限應變未達0.003,但同齡期樑試體在最大載重下的混
凝土應變則可超過0.003。水泥量(C=250kg/m3)較低的HPC樑試體,由於勁
度或彈性模數較高,藉由拉力筋減少、壓力筋增加及箍筋間距減小,所獲
得的延展性改善,比高水泥量(C=350kg/m3)者明顯。

In this paper we produced two sets of full size specimens
of High Performance concrete (HPC) beams which were set A andB .
The cement content of set A is 250 kg/cm3 and that of B is 350
kg/cm3 . The workability requirement of all specimens was slump
> 20 cm and slump flow > 60 cm. Flexural test conducted with
variable tension steel content,compression steel content and the
spacing of ties . We hope to get more knowledge of HPC beam in
ductility and flexural strength . In the process of experiment
we observed the failure mode and measured the deformation
according to the variety to get detail quality . The results
of experimentation show , the ACI code suggested rectangular
compression stress block predication of flexural strength was
conservative . Increasing the tension steel content can increase
the moment capacity while it decrease the ductility . Increasing
compression steel content can increase the ductility but the
influence of tension steel must smaller than compression steel .
Increasing the spacing of ties will decrease the ductility and
the compression steel will bucking easily . The strain of the
cylinder can not reach the value 0.003 on 56 days but that of
the beam can over the value . The lower cement content (250kg/
cm3) HPC beams improve ductility more effective than high cement
content (350kg/cm3) by decreasing tension steel content , the
spacing of ties , and increasing compression steel .
URI: http://hdl.handle.net/11455/13081
Appears in Collections:土木工程學系所

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