“…Many researchers have been studying the strength and deformation capacity of load-bearing walls under quasi-static, cyclic loading and dynamic loading on shaking tables; but most of them are concentrated on the cyclic loading. Hemamalini et al (2021) reports that shear deformation of a wall increased with lateral loading, with no surprise, but also increased with the aspect ratio (H/L) decrease. It was concluded that is important to consider the shear stiffness variation in cracked regions to improve the accuracy of the results.…”
Section: Precast Wallsmentioning
confidence: 99%
“…The walls have high stiffness and load capacity when the loads are applied in the wall plan, which contributes to the bracing and structural stabilization of the entire building (Singhal et al, 2019). This type of walls can provide a high degree of seismic protections in terms of damage control and prevention of collapse (Hemamalini et al, 2021). This literature review is focused mainly on the study of concrete walls with structural function.Figure 5.Examples of precast walls: (a) non-bearing walls; (b) bearing walls (Fib, 2008).…”
Section: Precast Wallsmentioning
confidence: 99%
“…The constructive system that uses load-bearing walls is very common in precast and prestressed concrete industry to construct buildings, because it provides simultaneously a cost-effective solution and a high strength (Hemamalini et al, 2021). Figure 6 shows some examples of precast constructions with the load-bearing wall system.Figure 6.Examples of wall system constructions (collected from O’Hegarty and Kinnane, 2020).…”
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.
“…Many researchers have been studying the strength and deformation capacity of load-bearing walls under quasi-static, cyclic loading and dynamic loading on shaking tables; but most of them are concentrated on the cyclic loading. Hemamalini et al (2021) reports that shear deformation of a wall increased with lateral loading, with no surprise, but also increased with the aspect ratio (H/L) decrease. It was concluded that is important to consider the shear stiffness variation in cracked regions to improve the accuracy of the results.…”
Section: Precast Wallsmentioning
confidence: 99%
“…The walls have high stiffness and load capacity when the loads are applied in the wall plan, which contributes to the bracing and structural stabilization of the entire building (Singhal et al, 2019). This type of walls can provide a high degree of seismic protections in terms of damage control and prevention of collapse (Hemamalini et al, 2021). This literature review is focused mainly on the study of concrete walls with structural function.Figure 5.Examples of precast walls: (a) non-bearing walls; (b) bearing walls (Fib, 2008).…”
Section: Precast Wallsmentioning
confidence: 99%
“…The constructive system that uses load-bearing walls is very common in precast and prestressed concrete industry to construct buildings, because it provides simultaneously a cost-effective solution and a high strength (Hemamalini et al, 2021). Figure 6 shows some examples of precast constructions with the load-bearing wall system.Figure 6.Examples of wall system constructions (collected from O’Hegarty and Kinnane, 2020).…”
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.
“…The mechanical performance of the vertical/ horizontal connections significantly affects the seismic performance of the assembly RC shear wall buildings. [1][2][3][4][5] Two important factors that affect the shear capacity of assembly connections are: (1) the connection method of rebars in the assembly connections, and (2) the configuration of the assembly connections. The connection methods of rebars at the assembly connection consist of welded connection, 6,7 pressed sleeve connection, 8 grout anchor connection, 9,10 and sleeve grouting connection.…”
Section: Introductionmentioning
confidence: 99%
“…The precast RC shear walls are connected by vertical and horizontal connections in assembly RC shear wall buildings. The mechanical performance of the vertical/horizontal connections significantly affects the seismic performance of the assembly RC shear wall buildings 1–5 . Two important factors that affect the shear capacity of assembly connections are: (1) the connection method of rebars in the assembly connections, and (2) the configuration of the assembly connections.…”
To improve the shear performance of assembly connections in precast RC shear wall structures, a novel polygon‐key assembly connection (PKA connection) was proposed. Shear tests were carried out to study the shear performance of the PKA connections, specimens' parameters considered in the tests consist of polygon‐key inclination angles, polygon‐key heights, and axial compression ratios. Shear capacity, stiffness, and failure modes of the PKA connections were investigated. Furthermore, theoretical analysis of the PKA connection was performed, equations of PKA connection's shear capacity were deduced, and the theoretical analysis results were verified by the test results. The results show that the polygon‐keys can effectively improve the shear capacity of assembly connection of precast RC shear wall structure. Compared with the parallel assembly connection, peak shear capacity of the PKA connection can be enhanced by more than 15%. When polygon‐key's inclination angle is within the range of 45–90°, the peak loads of PKA connections change slightly. When polygon‐key's height is within the range of 5–7 cm, the cracking load and peak load of the PKA connection change slightly. With an increase in axial compression ratio, the shear capacity of PKA connection gradually increases, and the peak displacement changes slightly. Based on the shear‐friction theory, the calculated PKA connection's peak loads are in good agreement with the test results.
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