论文部分内容阅读
通过对21个钢管轻集料混凝土试件的纯弯试验研究,分析了钢管轻集料混凝土抗弯刚度的影响因素,并将钢管轻集料混凝土试件的初始抗弯刚度和使用阶段抗弯刚度与国内外相关规范AIJ,BS5400,EC4,AISC-LRFD和DBJ13-51的计算结果进行了对比和分析,对钢管轻集料混凝土抗弯刚度的计算方法进行了探讨。试验结果表明,在其他参数相同的条件下,内填轻集料混凝土的强度对试件抗弯刚度影响很小,随着钢管壁厚的增加,试件抗弯刚度明显提高;有关抗弯刚度计算分析对比结果表明,除AIJ(1997)的计算结果与初始抗弯刚度以及使用阶段抗弯刚度试验结果吻合较好外,其余规范的计算结果均偏大。在计算钢管轻集料混凝土抗弯刚度时,建议采用日本AIJ(1997)给出的钢管普通混凝土抗弯刚度计算公式。
Through the pure bending test of 21 steel lightweight aggregate concrete specimens, the factors that affect the flexural rigidity of lightweight aggregate concrete filled steel tube were analyzed. The initial bending strength of lightweight aggregate concrete specimens and the bending moment The stiffness is compared with the calculation results of relevant domestic and international codes AIJ, BS5400, EC4, AISC-LRFD and DBJ13-51, and the calculation method of flexural rigidity of lightweight aggregate concrete filled steel tube is discussed. The test results show that under the same conditions of other parameters, the strength of light aggregate concrete filled in has little effect on the flexural rigidity of specimens, and the flexural rigidity of specimens increases obviously with the increase of wall thickness. Computation and analysis The comparison results show that the calculated results of other specifications are larger except for the results of AIJ (1997), which are in good agreement with the initial bending stiffness and the bending stiffness test of the use stage. In calculating the flexural rigidity of lightweight aggregate concrete filled steel tube, it is recommended to adopt the formula of flexural rigidity of concrete ordinary steel tube given by Japan AIJ (1997).