Experimental Research on Seismic Performance of New-Type Steel Reinforced Concrete Composite Columns
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摘要: 结合钢管混凝土叠合柱和十字形型钢混凝土柱的优点,提出了一种新型型钢-混凝土组合柱,即在钢管混凝土叠合柱的钢管外层钢筋混凝土中设置与内钢管相连的带翼缘型钢,所设置的型钢翼缘可以起到受力纵筋的作用,减少柱中纵筋数量,同时型钢翼缘可以改善钢管外混凝土的力学性能,减小传统钢管混凝土叠合柱中钢管内外混凝土的力学性能差异。对6个新型型钢-混凝土组合柱以及1个十字形型钢混凝土组合柱试件进行拟静力试验,设计参数主要包括截面形式、翼缘宽度、腹板高度等,研究组合柱在低周反复荷载作用下的滞回性能、骨架曲线、刚度退化、位移延性系数、弯矩-曲率特性及钢管、钢筋应变水平等。Abstract: Combined with the advantages of steel tube-reinforced concrete column and cross-shaped steel reinforced concrete column, a new type of steel reinforced concrete column was proposed. Steel flanges connected to the inner steel tube were arranged in the reinforced concrete outer layer of the steel tube of the steel tube-reinforced concrete column. The steel flanges could play the role of acting on the longitudinal bars to reduce the number of longitudinal bars in the column. And the steel flanges could improve the mechanical properties of concrete outside the steel tube and reduce the difference of mechanical properties of concrete inside and outside the steel tube in the traditional steel tube-reinforced concrete column. The quasi-static tests were carried out on 6 new type steel reinforced concrete columns and 1 cross-shaped steel reinforced concrete column, the design parameters mainly included section form, flange width and web height. The hysteretic performance, skeleton curve, stiffness degradation, displacement ductility coefficient, energy dissipation capacity, moment-curvature character, strain level of steel pipe and steel bars of composite column under quasi-static loading were studied.
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Key words:
- composite column /
- section form /
- seismic performance /
- quasi-static tests /
- strain level of steel
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