- 摘 要
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谷 倩 （武漢理工大學(xué)土木工程與建筑學(xué)院 武漢 430070）彭 波 彭少民 李繼祥 （湖北工程咨詢公司 武漢 4300710）
[提要] 基于9個(gè)三樁承臺和15個(gè)四樁承臺的模型試驗(yàn)，詳細(xì)分析了承臺的破壞形態(tài)和力學(xué)性能，以及鋼纖維混凝土( SFRC)用于樁基承臺的優(yōu)越性；通過對SFRC樁基承臺模型進(jìn)行全過程材料非線性計(jì)算，分析承臺的裂縫擴(kuò)展情況、應(yīng)力分布規(guī)律和傳力機(jī)理。綜合有限元計(jì)算和試驗(yàn)研究結(jié)果，提出了樁基厚承臺的空間拉桿拱或軟化桁架傳力模型，為《鋼纖維混凝土結(jié)構(gòu)設(shè)計(jì)與施工規(guī)程》的修訂提供理論支持和試驗(yàn)依據(jù)。
[關(guān)鍵詞] 樁基承臺 鋼纖維混凝土 非線性分析 有限元The modeling experiments on 9 three-pile caps and 15 four-pile caps specimen are carried on, the failure state, mechanic characteristic of thick piles cap and the obvious effect of adding steel fibers into concrete are analyzed in detail. In addition, a material nonlinear computation for steel fiber reinforced concrete piles cap model is also executed. The laws of cracks propagation, stress distribution and load-transferred rules are analyzed. Through concluding the finite element computing and experimental study achievements, the spatial tie-arch or softening-truss load-transferred model of piles cap are advanced, which provides theoretic support and experimental basis for corupiling the Specification for Technology of Fiber Reinforced Concrete Structures.
Keywords: pile cap; steel fiber reinforced concrete; nonlinear analysis; finite element
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