Experimental research on seismic behaviors of composite walls in the frozen thawing atmosphere

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (17) : 157-164.

ZHENG Shansuo, NIU Lihua, CHENG Mingchao, SUN Longfei

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Abstract

In order to study the seismic behaviors of composite walls in the frozen thawing atmosphere, the accelerated corrosion tests for 4 pieces of single span combination walls and 4 pieces double span of combination walls were conducted by applying the technique of artificial climate accelerated Freeze-thaw, and the quasi-static tests were carried out. The results showed that specimens were identified for shear failure under low cyclic loadings. The failure mode of composite walls was influenced by freeze-thaw environment. With the increasing freezing- thawing cycles, cracking load and the ultimate load are all reduced, the stiffness and energy dissipation of brick masonry combination walls degenerated with different extents, cracking displacement and the ultimate displacement are gradually increased. Under the same freezing- thawing cycles, the bearing ability and energy dissipation capacity of double-span combination walls are relatively higher than single-span combination walls，hysteretic curve is more fat, ductility coefficient is 1.2 times higher than single-span composite walls, stiffness degradation rate was significantly lower. The ultimate bearing capacity, deformation capacity and seismic behavior are effectively improved in the presence of the tied columns. In the end，the formula of shear capacity of composite wall is presented. And the calculating results agree well with test results．

Key words

frozen thawing atmosphere / composite walls / pseudo-static test / seismic performance / shear capacity

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ZHENG Shansuo, NIU Lihua, CHENG Mingchao, SUN Longfei . Experimental research on seismic behaviors of composite walls in the frozen thawing atmosphere[J]. Journal of Vibration and Shock, 2017, 36(17): 157-164

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