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为加强方钢管与管内混凝土的组合作用,提出在方钢管混凝土柱的钢管内壁设置开孔钢板(PBL)加劲肋。以长细比和偏心率为参数,进行了PBL加劲肋方钢管混凝土柱偏压性能试验,同时进行无加劲肋和钢板加劲肋方钢管混凝土柱的偏压对比试验。试验结果表明:无加劲肋构件为受压侧钢管管壁单波鼓曲破坏,钢板加劲肋和PBL加劲肋构件均为双波鼓曲破坏;PBL加劲肋构件承载力比未加劲构件提高了6.95%,比钢板加劲肋构件降低了4.33%,PBL加劲肋的主要作用体现在加强钢管与核心混凝土的组合作用,试件管内混凝土受拉裂缝分布更为均匀,裂缝宽度和间距更小。以方钢管混凝土偏压柱承载力计算公式为基础,考虑PBL加劲肋和孔内“混凝土榫”的作用,提出了PBL加劲肋方钢管混凝土柱偏压承载力的简化计算方法,公式计算结果与试验结果吻合良好。
In order to strengthen the combined effect of square steel tube and concrete in the pipe, a perforated steel plate (PBL) stiffener was proposed on the inner wall of the concrete filled steel tubular column. Based on the slenderness ratio and the eccentricity, the bias performance of the concrete filled square steel tubular columns with PBL stiffeners was tested, and the contrast test of CFST columns with stiffeners and steel stiffeners was carried out. The experimental results show that the stiffeners without stiffeners are damaged by the single wave drum tube wall, the stiffeners of steel plate and the stiffeners of PBL are all double-wave drum buckled. The bearing capacity of the stiffened stiffeners of PBL is 6.95 higher than that of the stiffened members %, Which is 4.33% lower than that of steel stiffener. The main function of PBL stiffener is to strengthen the combination of steel tube and core concrete. The concrete cracks in the test tube are more evenly distributed and the width and spacing of cracks are smaller. Taking the effect of PBL stiffener and hole “concrete mortise” in consideration of the formula of bearing capacity of concrete filled square steel tube (CFST) column, a simplified calculation method for the bearing capacity of CFL columns filled with CFL stiffeners was proposed. The formula The results agree well with the experimental results.