# Experimental Research on Mechanical Performance of SSRC Columns under Eccentric Compression
## 1 Introduction  
The corrosion of reinforcement reduces the service life of a structure and affects its general functioning. The damage caused by the corrosion of the reinforcement is usually difficult to repair. Stainless steel reinforcement offers oxidation resistance, high-temperature resistance, corrosion resistance, chemical stability, and high strength [1; 2; 3; 4; 5]. Some studies [6; 7] have shown that the replacement of traditional reinforcements with stainless steel reinforcement in certain erosive environments may offer excellent economic benefits. Recently, stainless-steel-reinforced concrete (SSRC) has been used to extend the service life of structures and reduce their life cycle costs [8; 9; 10; 11]. At present, SSRC is used in bridges, coasts, docks, and other projects, such as the HK-Zhuhai-Macao Bridge, the Apate Bridge in Stockholm (Sweden), and the Gala Galdana Bridge in Menorca (Spain). The cost of stainless-steel reinforcement is significantly higher than that of ordinary reinforcement and limits its application. However, with the development of smelting and rolling technology, various types of high-strength stainless steel reinforcements have been developed [12; 13; 14; 15; 16]. Low-nickel stainless steel reinforcements are highly cost-competitive. Compared with carbon steel, stainless steel has excellent corrosion resistance [3; 4; 16; 17; 18]. The presence of chromium forms dense passive films on the surface of stainless steel, making it resistant to electrochemical corrosion caused by chloride ions. However, this changed composition imparts significantly different mechanical properties to stainless steel. Stainless steel exhibits nonlinearity, early significant strain hardening, and high ductility under tension without a significant yield plateau. Owing to these altered properties, the mechanical properties of SSRC have become the focus of extensive research in recent years. Adequate bond performance between the reinforcement and concrete is essential to ensure the reliability of reinforced concrete (RC). Therefore, some studies [19; 20; 21] focused on evaluating the bond-slip characteristics between stainless steel reinforcement and concrete. [PERSON] et al. [20] investigated the bond strengths of SSRC specimens and standard RC specimens in a corrosive environment and analyzed the effects of the water-cement ratio and corrosion on the specimens. The test results indicated that, under the effect of corrosion, the bonding strength of SSRC members is stronger than that of RC specimens. [PERSON] et al. [21] compared the bonding properties of SSRC and standard RC and analyzed the effects of the concrete thickness, concrete strength, and steel bar diameter. The results of the past studies have demonstrated that stainless steel reinforcement and concrete have a good bond performance. Research on the structural behavior of SSRC has increased recently, with the focus being on the flexural performance, fatigue behavior, seismic behavior, and mechanical behavior under the impact load of SSRC [1; 22; 23; 24]. [PERSON] et al. [23] established the finite element model of SSRC beams based on the existing test data. They reported that the current code ignores the partial strength of stainless steel reinforcement after yielding and underestimates the bearing capacity of SSRC beams. Therefore, a new method for calculating the bearing capacity based on the continuous strength method is proposed. Hitherto, the existing research has indicated that the mechanical responses of SSRC and traditional RC differ. However, the mechanical behavior of SSRC subjected to eccentric compression has not been studied. Therefore, investigating the mechanical properties of SSRC and establishing corresponding specifications can reduce its engineering cost and promote its application. In this study, nine columns, including SSRC columns, were tested under eccentric compression and were theoretically analyzed.