高性能混凝土异型柱边框架抗震性能试验研究

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。

Experimental Study on Seismic Behavior of HPC Side Frame Structure with Specially shaped Columns

In this paper, high performance concrete(HPC) is adopted to build 2 side frame structure models with L shaped exterior columns and rectangular interior column. Different lateral rigidities are provided by changing the ratio of width to thickness of the specially shaped columns .The 2 bay and 2.5 story models are tested under low frequency lateral loads to study the earthquake resistance behavior of the structure. Through an investigation on the experimental phenomena and analysis of the test results, the lateral resistance capacity and deformation feature and energy dissipation ability are obtained. The research shows that the side frame structure with specially shaped columns made of HPC is a typical strong column and weak beam structure. With the increase of the width to thickness ratio of the specially shaped columns, the lateral rigidity of the frame structure with specially shaped columns improves; as a result the seismic resistance of the structure increases greatly. Especially after loading to yield point, it can be seen that the energy dissipation ability of the whole structure is enhanced distinctly. The conclusions drawn in this paper provide a research base for the seismic resistance design of this kind of structure and the wide application of high performance concrete.