Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/13601
標題: 含鋼線網剪力筋梁受動態荷重之剪力強度
Shear Strength of Reinforced Concrete Beams with Welded Wire Fabric as Shear Reinforcement under Cyclic Loading
作者: 張恭銘
Chang, Kung-Min
關鍵字: reinforced concrete;鋼筋混凝土;beam;shear;welded wire fabric;crack;梁;剪力;鋼線網;裂縫
出版社: 土木工程學系
摘要: 
本研究主要係針對含鋼線網(WWF)剪力筋混凝土梁受反覆載重下之剪力
強度進行分析研究,藉以瞭解鋼線網運用在混凝土梁剪力筋之適用性。本
次試驗共製作12根含鋼線網剪力筋及1根含傳統剪力筋之簡支混凝土梁,
試體採三分點加載,且所有試體皆設計為剪力破壞,試驗之變數包括混凝
土強度、剪跨比、撓曲鋼筋比、負彎矩鋼筋與正彎矩鋼筋比及剪力鋼筋比
等。除了探討含鋼線剪力筋混凝土梁之剪力行為外,並驗證ACI Code之適
用性。
試驗結果顯示,承受反覆載重作用之WWF腹筋梁,其剪力開裂強度較一般
傳統腹筋梁為高但極限剪力強度則相差無幾。在剪力裂縫寬度控制方面,
WWF剪力筋則較傳統腹筋為佳。此外,由於鋼線本身延展性即較傳統鋼筋
差,再加上反覆載重的作用,造成WWF腹筋梁的破壞模式均為剪力筋斷裂
破壞,而傳統腹筋梁則為斜張破壞。
比較試驗結果可發現,剪力開裂強度(Vcr)及極限剪力強度(Vn)均隨
著混凝土強度愈高、剪跨比愈小、撓曲鋼筋比愈大、負彎矩鋼筋與正彎矩
鋼筋比愈大,而強度愈高。但剪力筋量的增加雖對Vcr並無明顯變化,卻
能增加剪力筋之剪力強度(Vs),因而提高Vn值。至於在剪力裂縫寬度的
控制方面,以混凝土強度的增加,對裂縫控制能力的改善最為顯著。
反覆載重的施加及反覆次數的多寡,均對含鋼線網剪力筋混凝土梁之剪力
開裂強度、極限剪力強度與剪力裂縫寬度的控制,造成極大的負面影響。
此外,對照試驗值與ACI Code之剪力強度計算值得知,雖然ACI 95Code之
剪力強度計算值較接近試驗值,但剪力破壞為脆性破壞,仍以採用ACI
92Code偏保守之設計方法為佳。

The purpose of the study is to investigate the shear strength of
reinforced concrete beams with welded wire fabric as shear
reinforcement under cyclic loading. A total of thirteen beam
specimens were made. Twelve specimens contained welded wire
fabric while the other one contained conventional shear
reinforcement. The parameters included concrete strength, shear
span to depth ratio, amount of tension reinforcement, ratio of
negative steel to positive steel and amount of shear
reinforcement. The results show that shear
strengths at cracking of beams with welded wire fabric are
larger than those of beams with conventional shear
reinforcement, while ultimate shear strengths of both type of
beams are about the same. Beams with welded wire fabric showed
better crack control than beams with conventional shear
reinforcement. Cracking strength and ultimate strength of beams
under cyclic loading are much lower than those of beams under
monotonic loading. The ACI provisions apply if the upper limit
of 60000 psi design shear strength is still valid.
URI: http://hdl.handle.net/11455/13601
Appears in Collections:土木工程學系所

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