- 摘 要
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(西安建筑科技大學(xué)土木工程學(xué)院， 西安 710055)
［摘要］提出采用高延性纖維混凝土（HDC）改善低矮剪力墻的抗震性能和變形能力，設(shè)計(jì)了2個(gè)HDC低矮剪力墻試件，并進(jìn)行了擬靜力試驗(yàn)，研究其破壞機(jī)理、變形能力及耗能能力。試驗(yàn)結(jié)果表明：HDC低矮剪力墻破壞時(shí)，墻體中下部剪切斜裂縫寬度較小，說明HDC材料的受拉應(yīng)變硬化和多裂縫開展性能，可有效控制剪切斜裂縫的開展；與相關(guān)文獻(xiàn)中2個(gè)高強(qiáng)混凝土低矮剪力墻相比，HDC低矮剪力墻的變形和耗能能力明顯提高；利用HDC良好的抗剪性能，可以減少水平分布鋼筋的數(shù)量；HDC低矮剪力墻試件破壞時(shí)，墻體下部未產(chǎn)生較大面積的混凝土剝落，表明采用HDC可顯著改善低矮剪力墻的脆性剪切破壞模式，提高其抗震性能和損傷容限，減小或免去強(qiáng)震后的修復(fù)費(fèi)用。
［關(guān)鍵詞］高延性纖維混凝土； 低矮剪力墻； 抗震性能； 延性； 變形能力
中圖分類號：TU375文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2017)02-0057-07
Experimental study on seismic behavior of high ductile fiber reinforced concrete low-rise shear walls
Deng Mingke, Fang Chao, Dai Jie， Liang Xingwen
(School of Civil Engineering, Xi′an University of Architecture & Technology, Xi′an 710055, China)
Abstract:The high ductile fiber reinforced concrete (HDC) was used in low-rise shear walls to improve their seismic behavior and deformability, and 2 HDC low-rise shear walls were designed and tested under quasi-static load. The failure mechanism, energy dissipation capacity and deformability were studied. The results show that: when the HDC low-rise shear walls were damaged, the inclined cracks at the middle and bottom of HDC walls were fine, which suggests that the tensile strain hardening and multiple crack development performance of HDC can effectively control the development of shear inclined crack. The energy dissipation capacity and deformability of the HDC low-rise shear walls are obviously improved compared with another two high-strength concrete low-rise shear walls in relevant literatures. The good shear property of HDC is used to reduce the number of horizontal distribution reinforcement. What′s more, the concrete at the bottom of the HDC walls does not spall when the specimens are damaged, which shows that HDC can not only significantly improve the brittle shear damage mode of the low-rise shear wall, but also enhance its seismic behavior and damage tolerance, and then reduce or avoid the repair expenses after the strong earthquake.
Keywords:high ductile fiber reinforced concrete (HDC)； low-rise shear wall； seismic performance； ductility； deformability
*國家自然科學(xué)基金資助項(xiàng)目(51578445)，西安市科技計(jì)劃項(xiàng)目（CX13135-3）。
作者簡介：鄧明科，博士，教授，Email:dengmingke@126.com。
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