體外預應力加固石梁受彎性能試驗研究*
謝劍1，李柔1，武曉敏1，徐福泉2
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（1 天津大學濱海土木工程結構與安全教育部重點實驗室， 天津 300072；2 中國建筑科學研究院， 北京 100013)
［摘要］為研究體外預應力技術對石質構件的加固效果，對6個足尺石梁進行了受彎性能試驗研究，其中3個為未加固對比石梁，主要分析了石梁的破壞形態(tài)及受彎承載能力。試驗結果表明：加固后石梁的極限承載能力有所提高，變形能力有所改善；石材開裂后，由于預應力鋼絞線的作用，石梁仍有一定的承載能力，即承載力裕量。最后提出了加固石梁受彎承載力的簡化計算公式，對實際加固修復工程有一定的指導意義。［關鍵詞］體外預應力; 石梁; 加固; 受彎承載力; 承載力裕量中圖分類號：TU363 文獻標識碼：A 文章編號：1002-848X(2015)16-0096-05
Experimental study on flexural behavior of stone beams strengthened with external prestressingXie Jian1, Li Rou1, Wu Xiaomin1, Xu Fuquan2(1 Key Laboratory of Coast Civil Structure Safety, Ministry of Education, Tianjin University, Tianjin 300072, China; 2 China Academy of Building Research, Beijing 100013, China)Abstract: In order to study the strengthening effect of external prestressing technology on stone structural elements, the experimental study on flexural behaviors of six full-scale stone beams was carried out including three beams unreinforced as comparisons. The failure modes and the flexural capacity were mainly analyzed. The experimental results show that the ultimate bearing capacity and deformation capacity of the strengthened stone beams are improved to some extent. After cracking, the strengthened stone beams still have certain bearing capacity because of the action of prestressing strands, namely bearing capacity margin. The simplified flexural capacity calculation formula of the strengthened stone beams was proposed and it has been certain guiding significance to the actual reinforcement engineering.Keywords: external prestressing; stone beam; strengthening; flexural capacity; bearing capacity margin
*北京市古建筑石質結構安全狀況無損檢測技術研究與應用(Z121100000312002)。作者簡介：謝劍，博士，副教授，Email: xiejian@tju.edu.cn。
