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目的研究薄壁圆钢管再生混凝土混合中长柱的受力机理和力学性能,为钢管再生混凝土中长柱轴心受压设计提供理论依据.方法以截面含钢率、再生块体取代率和长细比为试验参数,设计了12根薄壁圆钢管再生混凝土混合中长柱,并对其破坏形式和特征、荷载-跨中挠度曲线、荷载轴向位移曲线以及承载力的敏感影响因素进行深入的研究.结果试验结果表明:当块体取代率由20%增至60%时,试件的极限承载力有一定程度的下降,延性无明显变化;当含钢率由0.038增至0.079时,其后期承载力提高约30%;当长细比由25增至35时,试件的极限承载力有所下降,但下降幅度不明显.结论含钢率能够明显提高试件的极限承载力和延性,再生块体取代率、长细比对承载力和延性的影响较小.
Aim To study the mechanics and mechanical properties of thin-walled circular steel tube mixed recycled concrete long columns, and to provide a theoretical basis for axial compressive design of long columns in recycled concrete.METHODS Based on the results of section steel ratio, mass replacement ratio and slenderness ratio In order to test the parameters, 12 thin-walled tubular reclaimed concrete mixed long and long columns were designed, and their damage forms and characteristics, load-span mid-deflection curve, load axial displacement curve and bearing capacity were deeply studied. Results The experimental results show that the ultimate bearing capacity of the specimens decreases to a certain degree when the mass replacement rate increases from 20% to 60%, and the ductility has no obvious change. When the steel content increases from 0.038 to 0.079, the ultimate bearing capacity The ultimate bearing capacity of the test piece decreased slightly, but the decrease range was not obvious.Conclusion The steel bearing capacity can obviously improve the ultimate bearing capacity and ductility of the test piece, and the regeneration block Body substitution rate, slenderness ratio of the bearing capacity and ductility less affected.