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本文在两榀不等跨异型柱边框架中,采用了掺加粉煤灰的大流动性高性能混凝土,并以变化异型柱柱肢宽厚比的方式获得不同的抗侧刚度。在低周反复荷载试验研究与对比分析基础上,得出了不同水平抗侧刚度的高性能混凝土异型柱边框架结构的水平承载能力、变形与耗能等抗震性能。研究表明:大流动性外掺粉煤灰的高性能混凝土异型柱边框架属于典型的“强柱弱梁”式结构,随着异型柱柱肢宽厚比的增加,异型柱框架结构水平抗侧刚度提高,高性能混凝土异型柱边框架的抗震性能明显改善,特别体现在屈服荷载点之后,框架结构的耗能能力有显著提高。本文的研究可供异型柱结构的抗震设计和高性能混凝土的推广作参考。
In this paper, a large-flow high-performance concrete with fly ash is adopted in the frame of unequal-shaped cross-shaped columns with two columns, and different lateral rigidity is obtained by changing the aspect ratio of columns with different shapes. On the basis of low cycle repeated load test and comparative analysis, the horizontal bearing capacity, deformation and energy dissipation of high performance concrete columns with different lateral stiffness are obtained. The results show that the high-performance concrete column with high flowability and fly ash belongs to the typical “strong column and weak beam” type structure. With the increase of the aspect ratio of the column, the horizontal lateral stiffness The seismic performance of improved and high-performance concrete special-shaped column side frame obviously improves, especially after yield point, the energy dissipation capacity of frame structure has been significantly improved. The research in this paper can be used as a reference for the seismic design of special-shaped columns and the promotion of high-performance concrete.