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聞  洋^1,2，羅國(guó)榮³，馬軍力⁴
（1北京科技大學(xué)土木與環(huán)境工程學(xué)院，北京  100083; 2內(nèi)蒙古科技大學(xué)建筑與土木工程學(xué)院，包頭014010; 3中國(guó)京冶工程技術(shù)有限公司，北京100088; 4包鋼（集團(tuán)）公司，包頭014010）

[摘要] 采用纖維模型法，用FORTRAN語(yǔ)言編制非線性數(shù)值計(jì)算程序，計(jì)算出矩形鋼管膨脹混凝土梁在單向受彎作用下的荷載-變形全過(guò)程關(guān)系曲線。通過(guò)對(duì)8根矩形鋼管膨脹混凝土梁的試驗(yàn)研究，考察了矩形鋼管膨脹混凝土的純彎力學(xué)性能。同時(shí)，將試驗(yàn)結(jié)果和理論分析計(jì)算的結(jié)果進(jìn)行了對(duì)比，發(fā)現(xiàn)吻合較好。根據(jù)試驗(yàn)結(jié)果，確定了矩形鋼管膨脹混凝土梁的極限承載力計(jì)算公式。最后，與其他形式的梁做了對(duì)比分析發(fā)現(xiàn)，矩形鋼管混凝土梁的承載力、變形及材料利用率有明顯的優(yōu)勢(shì)。
[關(guān)鍵詞] 矩形鋼管混凝土；梁；純彎；抗彎承載力

Research on the Mechanics Behavior of Concrete-filled Rectangular Steel Tubes Beam
Wen Yang^1,2,  Luo Guorong³,  Ma Junli⁴
(1University of Science and Technology Beijing, Civil & Environment Engineering School, Beijing   10083, China; 2 Inner Mongolia University of Science and Technology, Baotou  014010, China; 3 China Jingye Engineering Corporation Limited, Beijing 100088, China; 4 Bao Tou Iron & Steel(Group) Co. ,Ltd., Baotou  014010, China)

Abstract: Numerical analysis program was developed, which was applied for the analysis of flexural behavior of expansive concrete-filled rectangular steel tube beam subjected to pure bending. And eight expansive concrete-filled rectangular steel tube beams subjected to pure bending were tested to investigate the pure flexural behavior in this paper. Compared with the experimental results, the analytical results are found to agree well with the former. According to the experimental results, the evaluation of flexural capacity under pure bending condition was suggested. At last, compared with other kind of beam, expansive concrete-filled rectangular steel tube beam has the advantage of bearing capacity, deformation and using date of materials. The results in this paper may be referenced in practiced engineering.
Keywords: concrete-filled rectangular steel tube; beam; pure bending; flexural bearing capacity