Experimental Investigation into In-plane Stability of Concrete-Filled Steel Tubular Parabolic Arches Under Five-Point Co
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International Journal of Steel Structures (2020) 20(6):2038–2050 https://doi.org/10.1007/s13296-020-00429-y
Experimental Investigation into In‑plane Stability of Concrete‑Filled Steel Tubular Parabolic Arches Under Five‑Point Concentrated Loads Qing Hu1 · Changyong Liu2,3 · Changchun Yuan1 · Yuyin Wang2,3 · Sumei Zhang2,3 Received: 23 January 2020 / Accepted: 16 October 2020 / Published online: 31 October 2020 © Korean Society of Steel Construction 2020
Abstract This paper deals with experimental investigations into in-plane stability of fixed concrete-filled steel tubular (CFST) parabolic arches. Three CFST arches with the same span but different rise-to-span ratios were tested under five-point symmetrical concentrated loads over the full span. All applied loads were controlled in synchronization. The test results show that the test arches buckled in an antisymmetric failure mode and the section positions with the maximum deformation were slightly different for three test arches. It is found that the bearing capacity of CFST arches decreased significantly with the decline of rise-to-span ratios, and the outer steel tube provided significant confinement effects on the core concrete after the load reaches 80% of the load-carrying capacity. Moreover, comparisons between the test and finite element results indicate that the existing beam-element modeling method can predict the in-plane stability performance of CFST arches very well. Keywords Concrete-filled steel tube (CFST) · Parabolic arch · In-plane stability · Rise-to-span ratio · Five-point loadings
1 Introduction In the past few decades, concrete-filled steel tubular (CFST) arches with high compressive strength and construction convenience has been one of the most widely used structures in the bridge engineering, excavation and support of tunnels and aqueduct works (Wang et al. 2012). In addition, the research findings of CFST arches are abundant and involve various research fields including stability performance, seismic and dynamic behaviors, fire and wind resistance performance, construction techniques, investigations of longterm, temperature and voiding effects and so on. Among above research fields, the stability performance of CFST arches deserves more attention, as the significant index to * Changyong Liu [email protected] 1
School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China
2
Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, Harbin 150090, China
3
Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin 150090, China
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determine the structural safety and the key to the section design of arch ribs. The previous researches regarding the stability behaviours of CFST arches were mostly investigated by three methods, experimental studies, theoretical derivation and numerical simulation. In terms of experiments
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