考虑材料劣化的钢筋混凝土压弯构件承载力演化试验研究

doi:10.11896/cldb.18050182

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Abstract As the basic component, eccentric compression reinforced concrete (RC) members, such as arches and columns are widely used in high-rise buildings, large space structures and long-span bridges. With an extension in service years, eccentric compression RC members inevitably suffer from performance deterioration, the evolution of its bearing capacity has been one of the most concerned issues in the academic and engineering circles. To study the effect of corrosion damage on the bearing capacity of eccentric compression RC members, this work takes the RC arch bridges as the basic research object, fifteen RC columns with the same section size were designed and fabricated. The corrosion components were obtained based on Faraday's law. The distribution of corrosive cracks, the crack development, the displacements and strains, the bearing capacity and the failure patterns were studied. The strain field evolution law was also revealed based on the digital image correlation technology. The findings show that: (1) with the increase of corrosion rate, the distribution range, width and length of rust expansion cracks show an increasing trend, the compression displacement and deflection increase as the longitudinal and transverse stiffness of RC columns decrease, the bearing capacity decreases, and the maximum decrements of bearing capacity is about 40%; (2) the strain of the corroded columns with small eccentricity still accord with plane section assumption, while there is a failure trend for the plane section assumption with the increase of eccentricity; (3) rust expansion does not change the failure mode of eccentric compression members, the failure of the compression-bending members is due to brittle failure of compression side, corrosion damage changes the initial eccentricity, and small eccentric members may evolve to large eccentric failure; (4) the lateral strain field is chaotic, and the stratification is obvious due to the existence of rust and expansion cracks. This work systematically describes the behavior of the bearing capacity evolution of the corroded eccentric compression RC members, which could lay a so-lid starting point for the decay analysis of RC arch bridge bearing capacity based on equivalent beam-column principle.

Key words： corrosion reinforced concrete member bearing capacity digital image correlation technology arch bridge

Published: 19 June 2019

CLC number:	TU375
	U444

Fund:This work was financially supported by the National Key Research and Development Program of China (2017YFC0806007), the National Science Fund for Distinguished Young Scholars (51425801), the Technology Innovation and Application Demonstration Project of Chongqing (cstc2017rgzn-zdyfX0029), and the Science and Technology Planning Project of Yunnan Province of China (2017IB025).

About author:: Jingzhou Xin, studying for a doctor’s degree at Chongqing Jiaotong University, mainly engaged in bridge health monitoring and safety assessment.

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	XIN Jingzhou
	ZHOU Jianting
	ZHOU Yingxin
	SU Xin
	RAN Wenxing

Cite this article:

XIN Jingzhou,ZHOU Jianting,ZHOU Yingxin, et al. Experimental Study on Bearing Capacity Evolution of Reinforced Concrete Compression-bending Members Considering Material Deterioration[J]. Materials Reports, 2019, 33(14): 2362-2369.

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http://www.mater-rep.com/EN/10.11896/cldb.18050182 OR http://www.mater-rep.com/EN/Y2019/V33/I14/2362

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