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(河海大學(xué)土木工程學(xué)院，  南京  210098)
［摘要］通過(guò)對(duì)21個(gè)鋼管輕集料混凝土試件的純彎試驗(yàn)研究，分析了鋼管輕集料混凝土抗彎剛度的影響因素，并將鋼管輕集料混凝土試件的初始抗彎剛度和使用階段抗彎剛度與國(guó)內(nèi)外相關(guān)規(guī)范AIJ，BS5400，EC4，AISC-LRFD和DBJ13-51的計(jì)算結(jié)果進(jìn)行了對(duì)比和分析，對(duì)鋼管輕集料混凝土抗彎剛度的計(jì)算方法進(jìn)行了探討。試驗(yàn)結(jié)果表明，在其他參數(shù)相同的條件下，內(nèi)填輕集料混凝土的強(qiáng)度對(duì)試件抗彎剛度影響很小，隨著鋼管壁厚的增加，試件抗彎剛度明顯提高；有關(guān)抗彎剛度計(jì)算分析對(duì)比結(jié)果表明，除AIJ（1997）的計(jì)算結(jié)果與初始抗彎剛度以及使用階段抗彎剛度試驗(yàn)結(jié)果吻合較好外，其余規(guī)范的計(jì)算結(jié)果均偏大。在計(jì)算鋼管輕集料混凝土抗彎剛度時(shí)，建議采用日本AIJ（1997）給出的鋼管普通混凝土抗彎剛度計(jì)算公式。
［關(guān)鍵詞］圓鋼管輕集料混凝土；純彎試驗(yàn)；初始抗彎剛度；使用階段抗彎剛度
Calculations of flexural stiffness of lightweight aggregate concrete filled circular steel tube
Ji Bohai， Fu Zhongqiu, Shen Yun， Peng Changxian, Huang Chunhui(College of Civil Engineering, Hohai University, Nanjing 210098, China)
Abstract:21 lightweight aggregate concrete filled steel tubes （LACFST）subjected to pure bending were carried out. Influencing factors of the flexural stiffness of LACFST were analyzed. The initial flexural stiffness and the service-level flexural stiffness of the specimens were compared with design codes both at home and abroad, such as AIJ, BS5400, EC4, AISC-LRFD and DBJ13-51． The calculation method of the flexural stiffness of LACFST was discussed. The results show that the strength of lightweight aggregate concrete has a little effect on the flexural stiffness, but with the thickness of steel tube increasing, the flexural stiffness are enhanced significantly. The test results were compared with the results calculated by the formulas, it is showed that the results calculated by the formula of AIJ are in good agreement with the test results of initial flexural stiffness and the service-level flexural stiffness, but the results calculated by the formula of others are greater than the test results. The formula of AIJ is recommended in the calculation of flexural stiffness of LACFST.
Keywords:circular lightweight aggregate concrete filled steel tube; pure bending test; initial flexural stiffness;  flexural stiffness
江蘇省建設(shè)廳科研資助項(xiàng)目(JS2005ZD11)。
作者簡(jiǎn)介：吉伯海(1966-)，男，博士，教授，博士生導(dǎo)師，Email:bhji@hhu.edu.cn。
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