箱形型鋼混凝土梁受彎性能試驗研究及理論分析
張根俞1，覃志尚2，邢凈凈3
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（1 中國建筑設計研究院，北京100044；2 江蘇省建筑設計研究院有限公司，北京210019）（3 南京市市政設計研究院有限責任公司，南京210008）[摘要]通過對3根型鋼混凝土梁進行的受彎性能試驗，重點描述了箱形型鋼混凝土梁的受彎破壞過程，在此基礎上依據(jù)混凝土、鋼筋及型鋼在不同位置處的實測應變變化情況，詳細分析了箱形型鋼混凝土梁整個加載過程的力學性能。對強度疊加法進行了修正，提出了考慮混凝土約束效應的抗彎承載力計算方法，克服了規(guī)程計算值過于保守的缺陷，通過對已有文獻中45個構件的試驗數(shù)據(jù)對比分析表明，公式計算值與試驗結果吻合良好，可為型鋼混凝土規(guī)范的修訂提供參考，同時可用于工程設計中。[關鍵詞]型鋼混凝土;抗彎承載力;力學性能中圖分類號： TU398+.7 文獻標識碼：A 文章編號：1002-848X(2013)S1-0473-05Experimental study and theoretical analysis on flexural behavior of box steel encased concrete beamsZhang Genyu1, Qin Zhishang2, Xing Jingjing3（1 China Architecture Design & Research Group,Beijing,100044, China; 2 Jiangsu Provincial Architectural D & R Institute LTD, Jiangsu210019, China; 3 Nanjing Municipal Design and Research Institute Co.,LTD., Jiangsu 210008, China）Abstract: In this paper, the flexural loading experiments of 3 SRC beams has been carried out, flexural destruction process of box SRC beams are mainly described. Based on the experiment, the mechanical behavior of box SRC beams during the whole loading process is analyzed in detail by practical strain changes of the strain gauges attached to different positions of concrete, reinforcement bars and steels. Simultaneously, the strength superposition method was revised, and computational method for calculating the bending bearing capacity of steel-encased concrete beams was established, the shortcomings of strength superposition method was overcome. A comparison with 45 trial values demonstrates that the computational formulae proposed in this paper accord well with trial values, and can provide a reference for the revise of codes for steel-encased concrete as well as engineering design.Keywords: steel-encased concrete; bending bearing capacity; mechanical behavior
