“…This system has a hole that fits in a corresponding anchor bolt, then the walls are attached using nuts and washers. Taheri et al (2016) and Vaghei et al (2019) studied a connection composed by male-female panels, rubber, hooks, bolts and nut (Figure 17(e)). This system was an improvement of the loop connection (wet connection) and the results showed a significant increase of the maximum strength (Biswal et al, 2019).…”
Section: Precast Walls Connectionsmentioning
confidence: 99%
“…Finally, here is also an H-connector with steel bolts that was studied to link precast walls and showed a satisfactory performance under monotonic and cyclic loading (Sun et al, 2019) (Figure 17(f)). Figure 17.Examples of dry connections (collected/adapted from literature review: (a) Brunesi and Nascimbene, 2017; (b) Cai et al, 2019; (c) Guo et al, 2019; (d) Psycharis et al, 2018; (e) Taheri et al, 2016 and Vaghei et al, 2019; (f) Sun et al, 2019.…”
Section: Precast Walls Connectionsmentioning
confidence: 99%
“…Examples of dry connections (collected/adapted from literature review: (a) Brunesi and Nascimbene, 2017; (b) Cai et al, 2019; (c) Guo et al, 2019; (d) Psycharis et al, 2018; (e) Taheri et al, 2016 and Vaghei et al, 2019; (f) Sun et al, 2019.…”
Extreme events, with natural or manmade causes, such as floods, pandemics and wars, have recently brought the need to provide shelter and field hospitals in a very fast and affordable way. Prefabrication can play an relevant role in this context, by offering several advantages compared to on-site construction. The precast structural wall system is a paradigmatic example of how precast structural members can contribute to speed up construction and reduce costs. A new research project was defined to develop with the aim of delivering a new product, a precast structural concrete wall system, where the design of the wall itself and connections are key, keeping in mind not only the above requirements, but also the new demands created by the recent challenges of the construction sector. To reach this goal, first is necessary to survey the existing commercial solutions and developed by researchers and analyse the main scientific and technical documents about precast structural wall systems. Herein, a comprehensive review is presented, aiming at identifying the most relevant aspects regarding precast structural concrete walls and connections. The main advances made in the past and that are being developed in the present are also highlighted. The growing concerns of the prefabrication sector about durability and sustainability were identified as mandatory for new generation of products. To produce prefabricated solutions with less environmental impact is required, beyond the optimization related with cement consumption, connections that are easier to use, to maintain and that allow disassembly, for future deconstruction and reuse. So, innovative improvements are proposed, namely, dry connections and concrete composite walls to be addressed in future work, with the goal of correcting some of the drawbacks found in existing solutions.
“…This system has a hole that fits in a corresponding anchor bolt, then the walls are attached using nuts and washers. Taheri et al (2016) and Vaghei et al (2019) studied a connection composed by male-female panels, rubber, hooks, bolts and nut (Figure 17(e)). This system was an improvement of the loop connection (wet connection) and the results showed a significant increase of the maximum strength (Biswal et al, 2019).…”
Section: Precast Walls Connectionsmentioning
confidence: 99%
“…Finally, here is also an H-connector with steel bolts that was studied to link precast walls and showed a satisfactory performance under monotonic and cyclic loading (Sun et al, 2019) (Figure 17(f)). Figure 17.Examples of dry connections (collected/adapted from literature review: (a) Brunesi and Nascimbene, 2017; (b) Cai et al, 2019; (c) Guo et al, 2019; (d) Psycharis et al, 2018; (e) Taheri et al, 2016 and Vaghei et al, 2019; (f) Sun et al, 2019.…”
Section: Precast Walls Connectionsmentioning
confidence: 99%
“…Examples of dry connections (collected/adapted from literature review: (a) Brunesi and Nascimbene, 2017; (b) Cai et al, 2019; (c) Guo et al, 2019; (d) Psycharis et al, 2018; (e) Taheri et al, 2016 and Vaghei et al, 2019; (f) Sun et al, 2019.…”
Extreme events, with natural or manmade causes, such as floods, pandemics and wars, have recently brought the need to provide shelter and field hospitals in a very fast and affordable way. Prefabrication can play an relevant role in this context, by offering several advantages compared to on-site construction. The precast structural wall system is a paradigmatic example of how precast structural members can contribute to speed up construction and reduce costs. A new research project was defined to develop with the aim of delivering a new product, a precast structural concrete wall system, where the design of the wall itself and connections are key, keeping in mind not only the above requirements, but also the new demands created by the recent challenges of the construction sector. To reach this goal, first is necessary to survey the existing commercial solutions and developed by researchers and analyse the main scientific and technical documents about precast structural wall systems. Herein, a comprehensive review is presented, aiming at identifying the most relevant aspects regarding precast structural concrete walls and connections. The main advances made in the past and that are being developed in the present are also highlighted. The growing concerns of the prefabrication sector about durability and sustainability were identified as mandatory for new generation of products. To produce prefabricated solutions with less environmental impact is required, beyond the optimization related with cement consumption, connections that are easier to use, to maintain and that allow disassembly, for future deconstruction and reuse. So, innovative improvements are proposed, namely, dry connections and concrete composite walls to be addressed in future work, with the goal of correcting some of the drawbacks found in existing solutions.
“…Table 2 summarized the findings of three (3) out of ten (10) papers that have been reviewed and discussed wire ropes connection in terms of embedded length, bonding stress and modes of failure. [14].…”
Precast concrete wall is one of the prefabricated components of high demands in the construction industry especially in residential buildings as it combines the benefit of rapid speed of construction, good quality control and minimum labour intensity at the construction site. Precast wall is produced in forms of wall panels and connected in the construction site to form an integrated structural element called precast concrete wall. However, the connection of wall panels is a key factor as it provides the structure integrity and robustness of the overall structural system. Therefore, this paper aims to describe and summarize types of precast wall-to-wall horizontal connection in terms structural behaviours such as embedded length, bonding stress, seismic behaviours and modes of failure. A total number of ten (10) out of eighteen (18) papers will be reviewed and discussed. The findings show that loop connection is suitable for seismically stabile zones as it is not capable to withstand lateral load action effectively whereas wire rope connection has insufficient ductility as the load -carrying capacity is governed by yielding of the lock bar and crushing of the joint mortar. Furthermore, U-shaped steel channel connection, the connection was developed for seismic zones. Providing U-shaped rubber in between the U-shape steel channel has made the connection more flexible with energy dissipater system.
Keywords: Precast concrete wall-to-wall connection; structural behaviours of precast wall-to-wall horizontal connections; mode of failure of precast wall-to-wall horizontal connections.
“…Several connection systems for vertical joints have been recommended by researchers across the globe such as U-bars, O-connectors [12], steel plates and anchors [13] and U-shaped channel and rubber [14]. Table 1 summarizes different connection systems for precast RC panels and their behaviour under lateral loading.…”
Loop connection for precast RC structural components using U-bars is advocated by researchers on the grounds of simple mechanism and strength. However, the system is difficult to materialize on-site, in the lieu of which U-bars may be replaced with steel wire ropes, which offer a more suitable system with regards to convenience during the installation process.However, literature lacks on design requirements and methodology for loop connection. Thus, a theoretical study was undertaken to formulate the design methodology for loop connection formed using steel wire ropes. The behaviour of loop connection is governed by tension and shear, influenced by characteristics of wire ropes, grout and vertical transverse bar. A design example is illustrated for loop connection between precast wall-column, whose validation is demonstrated through numerical analysis and performance compared with monolithic system and U-bar connection. The advantages of the research relates to the systematic design approach considering all the influencing parameters of steel wire loop connection for precast components. It is expected that the proposed design methodology will be useful to practising engineers for designing the loop connection for precast components.
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