闻  洋^1,2，罗国荣³，马军力⁴
（1北京科技大学土木与环境工程学院，北京  100083; 2内蒙古科技大学建筑与土木工程学院，包头014010; 3中国京冶工程技术有限公司，北京100088; 4包钢（集团）公司，包头014010）

[摘要] 采用纤维模型法，用FORTRAN语言编制非线性数值计算程序，计算出矩形钢管膨胀混凝土梁在单向受弯作用下的荷载-变形全过程关系曲线。通过对8根矩形钢管膨胀混凝土梁的试验研究，考察了矩形钢管膨胀混凝土的纯弯力学性能。同时，将试验结果和理论分析计算的结果进行了对比，发现吻合较好。根据试验结果，确定了矩形钢管膨胀混凝土梁的极限承载力计算公式。最后，与其他形式的梁做了对比分析发现，矩形钢管混凝土梁的承载力、变形及材料利用率有明显的优势。
[关键词] 矩形钢管混凝土；梁；纯弯；抗弯承载力

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