“…Straight profiles (e.g., channels, tubes and I-sections) are suitable for construction of FRP truss arches (Sobrino and Pulido, 2002). Large curved profiles can function as a standalone arch span (Liu et al, 2021a) while curved bars can serve as replacement for steel reinforcement in concrete arches (Caratelli et al, 2016; Tang et al, 2021). Of particular interest is the possibility to form arches by bending initially straight pultruded members, which is discussed in the subsequent sub-section.…”
Section: Manufacturing Methods For Curved Frp Membersmentioning
confidence: 99%
“…The proposed protective structures with BFRP or SFCB reinforcement are still in the development phase. A series of tests have been conducted on semi-circular arch specimens and such-based tunnels (Figure 11) to evaluate the static performance and blast resistance (Tang et al, 2020, 2021; Wu et al, 2022; Zhao et al, 2022). Figure 11.SFCBs/BFRP bars-reinforced semi-circular arch and such-based tunnel (Zhao et al, 2022): (a) Reinforcement cage; (b) Assembled modular tunnel.…”
“…The proposed protective structures with BFRP or SFCB reinforcement are still in the development phase. A series of tests have been conducted on semi-circular arch specimens and such-based tunnels (Figure 11) to evaluate the static performance and blast resistance (Tang et al, 2020(Tang et al, , 2021Wu et al, 2022;Zhao et al, 2022).…”
Fiber-reinforced polymer (FRP) composites are a class of advanced non-metallic materials featuring advantages of high strength, light weight and excellent corrosion resistance. These advantages, in conjunction with the various methods available for making curved FRP members, create a wide range of possibilities for innovating arch structures with FRP composites. However, this subject has received inadequate research attention despite the exciting prospects demonstrated by pioneer studies. This paper provides a review on this subject with the aim to build a holistic picture and engage wider research participation. The paper begins with an overview of four feasible manufacturing/forming methods (vacuum infusion, filament winding, pultrusion and active bending), with an emphasis on their capability of creating curved FRP members and potential applications in arch structures. A review is next made on previous arch projects and relevant novel concepts, which are classified into two categories (all-FRP arches and FRP-incorporating hybrid arches) with distinct functionality and targeted areas of application. On the basis of this review, directions for future development of each of the two categories are highlighted, with a number of challenges and potential solutions discussed.
“…Straight profiles (e.g., channels, tubes and I-sections) are suitable for construction of FRP truss arches (Sobrino and Pulido, 2002). Large curved profiles can function as a standalone arch span (Liu et al, 2021a) while curved bars can serve as replacement for steel reinforcement in concrete arches (Caratelli et al, 2016; Tang et al, 2021). Of particular interest is the possibility to form arches by bending initially straight pultruded members, which is discussed in the subsequent sub-section.…”
Section: Manufacturing Methods For Curved Frp Membersmentioning
confidence: 99%
“…The proposed protective structures with BFRP or SFCB reinforcement are still in the development phase. A series of tests have been conducted on semi-circular arch specimens and such-based tunnels (Figure 11) to evaluate the static performance and blast resistance (Tang et al, 2020, 2021; Wu et al, 2022; Zhao et al, 2022). Figure 11.SFCBs/BFRP bars-reinforced semi-circular arch and such-based tunnel (Zhao et al, 2022): (a) Reinforcement cage; (b) Assembled modular tunnel.…”
“…The proposed protective structures with BFRP or SFCB reinforcement are still in the development phase. A series of tests have been conducted on semi-circular arch specimens and such-based tunnels (Figure 11) to evaluate the static performance and blast resistance (Tang et al, 2020(Tang et al, , 2021Wu et al, 2022;Zhao et al, 2022).…”
Fiber-reinforced polymer (FRP) composites are a class of advanced non-metallic materials featuring advantages of high strength, light weight and excellent corrosion resistance. These advantages, in conjunction with the various methods available for making curved FRP members, create a wide range of possibilities for innovating arch structures with FRP composites. However, this subject has received inadequate research attention despite the exciting prospects demonstrated by pioneer studies. This paper provides a review on this subject with the aim to build a holistic picture and engage wider research participation. The paper begins with an overview of four feasible manufacturing/forming methods (vacuum infusion, filament winding, pultrusion and active bending), with an emphasis on their capability of creating curved FRP members and potential applications in arch structures. A review is next made on previous arch projects and relevant novel concepts, which are classified into two categories (all-FRP arches and FRP-incorporating hybrid arches) with distinct functionality and targeted areas of application. On the basis of this review, directions for future development of each of the two categories are highlighted, with a number of challenges and potential solutions discussed.
“…BFRP bars are not only used in beams, slabs, columns, and other common components [19][20][21] but are also used in the construction of concrete arch structures [22]. Tang et al [23,24] used BFRP bars instead of steel bars to make concrete arch members and found that the concrete arch with BFRP bars had comparable resistance to the concrete arch with steel bars, under air-explosion. Zhao et al [25] found that the BFRP-steel composite bars reinforced concrete arches exhibited a higher load-bearing capacity and more safety redundancy than the steel bars reinforced concrete arches.…”
This paper proposes a prefabricated basalt fiber reinforced polymer (BFRP) bars reinforcement of a concrete arch structure with superior performance in the field of protection engineering. To study the anti-blast performance of the shallow-buried BFRP bars concrete arch (BBCA), a multi-parameter comparative analysis was conducted employing the LS-DYNA numerical method, which was verified by the results of the field explosion experiments. By analyzing the pressure, displacement, acceleration of the arch, and the strain of the BFRP bars, the dynamic response of the arch was obtained. This study showed that BFRP bars could significantly optimize the dynamic responses of blast-loaded concrete arches. The damage of exploded BBCA was divided into five levels: no damage, slight damage, obvious damage, severe damage, and collapse. BFRP bars could effectively mitigate the degree of damage of shallow-buried underground protective arch structures under the explosive loads. According to the research results, it was feasible for BFRP bars to be used in the construction of shallow buried concrete protective arch structures, especially in the coastal environments.
“…To improve the corrosion resistance of underground arches in the embankment structure, steel rods have been replaced by rods with basalt fibers and hybrid steel rods [14]. The study was conducted on eight arches.…”
The article is devoted to a topical issue - the development of a method of densification of the base of the underground interstation tunnel to prevent further intensive subsidence of tunnel structures. Based on computer-mathematical modeling, the work establishes experimental dependence between the angle of inclination of jet grouting piles and the amount of subsidence of the distribution plate on which the tunnel structures rest upon. Inspection of the technical condition and analysis of defects in a comprehensive comparison with subsidence graphs allowed us to identify the main typical deformations during subsidence of a shallow tunnel built from blocks of a solid-section frame, namely their characteristic features, geometric parameters and placement points.
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