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The Investigation on flexural performance of prestressed concrete-encased high strength steel beams

Wang Jun, Jiao Yurong, Cui Menglin, Yang Wendong, Fang Xueqi, Yan Jun

Archives of Civil Engineering

2024

Vol. 70, nr 1

405--420

This paper reports an experimental on the flexural performance of prestressed concrete-encased high-strength steel beams (PCEHSSBs). To study the applicability of high-strength steel (HSS) in prestressed concrete-encased steel beams (PCESBs), one simply supported prestressed concrete-encased ordinary strength steel beam (PCEOSSB) and eight simply supported PCEHSSBs were tested under a four-point bending load. The influence of steel strength grade, I-steel ratio, reinforcement ratio and stirrup ratio on the flexural performance of such members was investigated. The test results show that increasing the I-steel grade and I-steel ratio can significantly improve the bearing capacity of PCESB. Increasing the compressive reinforcement ratio of PCEHSSB can effectively improve its bearing capacity and ductility properties, making full use of the performance of HSS in composite beams. Increasing the hoop ratio has a small improvement on the load capacity of the test beams; setting up shear connectors can improve the ductile properties of the specimens although it does not lead to a significant increase in the load capacity of the combined beams. Then, combined with the test data, the comprehensive reinforcement index considering the location of reinforcement was proposed to evaluate the crack resistance of specimens. The relationship between the comprehensive reinforcement index and the crack resistance of specimens was given.

Assessment of the bending bearing capacity of the GGBFS-based geopolymer concrete beams exposed to acidic environment

Mahdikhani Mahdi, Sarvandani Milad Hatamiyan

Archives of Civil and Mechanical Engineering

2021

Vol. 21, no. 4

417--436

Currently, ordinary Portland cement is used most of the time as a sticky material of the concrete produced for construction purposes. Unfortunately, the function of the prefabricated concrete made of Portland Cement against chemical factors such as acid attacks and sulfate attacks, raises concerns, because the grout of Portland Cement decomposes, being exposed to acids. Novel construction materials with a strength better than that of the ordinary Portland concrete are required, to be able to resist such corrosive factors. This essay presents an assessment of the strength of GGBFS-based geopolymer concrete samples against acid attacks. In this research, geopolymer concrete beams reinforced with steel and GFRP rebars, also the fabricated cubic concrete samples, underwent tests of mechanical properties, being exposed to acid environments with different pH levels of 4, 6 and 8. Beams reinforced with steel rebars proved to be of a higher strength compared with beams reinforced with GFRP. On an average, the forces applied on the beams reinforced with steel on day 90 and day 300 were, respectively, 14.47 and 14.78% higher than the forces applied on the beams reinforced with GFRP. Compared with the beams reinforced with GFRP, those reinforced with steel revealed to be of a higher resistance when exposed to the environmental changes.