Cyclic behavior of composite timber-masonry wall in quasi-dynamic conditions reinforced with superelastic damper

Branco, Miguel; Gonçalves, Aline Kuramoto; Guerreiro, Lúıs; Ferreira, J.G.

doi:10.1016/j.conbuildmat.2013.10.095

Cited by 20 publications

(7 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The use of pseudoelasticity to damp the structural vibrations during a seismic event is addressed in many research works, and a significant number of new base isolation systems as well as new pseudoelastic dampers have been proposed. Huang et al [8] presented a base isolation system composed by two superelastic SMA helical springs and a linear slider; Qian et al [9,10] presented two dampers, one composed by pre-tensioned superelastic shape memory alloy wires with friction device, and the other by pairs of NiTi wires to allow the re-centering; Branco et al [11] studied a superelastic dampers based on NiTi wires installed to strengthen a composite timber-masonry wall; Parulekar et al [12] design a two concentric pipes, which move mutually thanks to pseudoelastic NiTi wires; Fang et al and Rofooei et al [13,14] presented new pseudoelastic connections; Kuang et al [15] embedded SMA wires to promote the selfhealing of concrete; Dolce et al [16] proposed a re-centering damper made of groups of NiTi wires.…”

Section: Introductionmentioning

confidence: 99%

An experimental study on pseudoelasticity of a NiTi-based damper for civil applications

Nespoli

Bassani

Torre

et al. 2017

Smart Mater. Struct.

View full text Add to dashboard Cite

In this work, a pseudoelastic damper composed by NiTi wires is tested at 0.5, 1 and 2 Hz for 1000 mechanical cycles. The damping performances were evaluated by three key parameters: the damping capacity, the dissipated energy per cycle and the maximum force. During testing, the temperature of the pseudoelastic elements was registered as well. Results show that the damper assures a bi-directional motion throughout the 1000 cycles together with the maintenance of the recentering. It was observed a stabilization process in the first 50 mechanical cycles, where the key parameters reach stable values; in particular it was found that the damping capacity and the dissipated energy both decrease with frequency. Besides, the mean temperature of the pseudoleastic elements reaches a stable value during tests and confirms the different response of the pseudoelastic wires accordingly with the specific length and stain. Finally, interesting thermal effects were observed at 1 and 2 Hz: at these frequencies and at high strains, the maximum force increases but the temperature of the NiTi wire decreases being in contraddiction with the Clausius–Clapeyron law.

show abstract

Section: Introductionmentioning

confidence: 99%

An experimental study on pseudoelasticity of a NiTi-based damper for civil applications

Nespoli

Bassani

Torre

et al. 2017

Smart Mater. Struct.

View full text Add to dashboard Cite

show abstract

“…Using damper elements for strengthening the timber structures subjected to earthquakes is an expensive method compared to other strategies, and skilled workers are needed for the installation. Experimental tests, as shown in Figure 17a, were performed by Branco et al [125] to investigate the effect of this retrofitting strategy. Test results reveal that this method increases the dissipated energy and load-bearing capacity up to 1.3 times that of an unreinforced wall.…”

Section: Dampermentioning

confidence: 99%

Seismic Vulnerability Assessment and Strengthening of Heritage Timber Buildings: A Review

et al. 2021

View full text Add to dashboard Cite

Recent studies highlight the potential impact of earthquakes on cultural heritage sites and monuments, which in turn yield significant adverse impacts on economies, politics, and societies. Several aspects such as building materials, structural responses, and restoration strategies must be considered in the conservation of heritage structures. Timber is an old organic construction material. Most of the historic timber structures were not designed to withstand seismic forces; therefore, the seismic vulnerability assessment of heritage timber structures in areas with high seismic hazard is essential for their conservation. For this purpose, different strategies for the numerical modeling of heritage timber buildings have been developed and validated against tests results. After performing seismic analysis using detailed analytical methods and predicting the susceptible structural components, strengthening techniques should be utilized to mitigate the risk level. To this aim, various methods using wooden components, composite material, steel components, SMA etc., have been utilized and tested and are reviewed in this study. There are still some gaps, such as full-scale numerical modeling of strengthened buildings and investigating the soil–structure interaction effects on the seismic behavior of buildings that should be investigated.

show abstract

“…At present, the reinforcement materials for MJT are fiberreinforced polymers [9][10][11][12][13], steel components [14], damper [15,16], shape memory alloy [17], bolt and screw [18][19][20][21], etc. Kim et al [22] reinforced the MJT with GFRP and FRP.…”

Section: Introductionmentioning

confidence: 99%

“…Tests done by Branco et al [27] showed that the use of bolts and screws did not increase the in-plane load-bearing capacity (only 1.1 times), and the dissipated energy of the wood-framed walls did not increase. The use of internal bolts (steel bars) to strengthen the connection of timber frame walls is another technique studied by Branco et al [15]. The influence of the angle of the rod on the bearing capacity in the plane is studied, and the results show that the bearing capacity, stiffness, and dissipated energy are reduced by increasing the angle from 30°to 60°.…”

Section: Introductionmentioning

confidence: 99%

A Wooden Pin Reinforcement of Ancient Chinese Wooden Temple: A Case of Daxiong Hall

Zhang,

Gao,

Wang

2024

Advances in Civil Engineering

View full text Add to dashboard Cite

Post and lintel frame is a prominent architectural structure in Chinese temple architecture, characterized by its wooden construction. Mortise–tenon joints (MTJs) serve as the primary connection method for these wooden structures, employing straight mortise nodes (SMNs) and through-mortise joints (TMNs). This study presents a method that utilizes wooden pins to reinforce MTJs, enhancing the seismic performance of timber frame structures. Finite element (FE) simulation verifies the effectiveness of wooden pins in reinforcing both SMNs and TMNs, leading to improved load-bearing capacity and ductility of the MTJs. Additionally, the study confirms that reinforced nodes help to restrict the displacement changes within the wooden frame. The paper also investigates the optimal distribution of MTJs reinforced by the wooden pins throughout the structure, with the aim of enhancing the wood frame’s seismic performance. The results show the bearing capacity of MJT reinforced with wooden pins is approximately 11.3% higher compared to that of MTJ without reinforcement. The reinforcement of wood pins effectively controls the horizontal displacement of the overall structure of the wooden frame, which is reduced by about 50%–62% compared with the unreinforced wooden frame. The locating the wooden pin-reinforced MTJs in the outer columns and middle layer columns reduces the structural displacement, which is 31.53% in X direction, 5% in Y direction, and 25.86% in Z direction.

show abstract

Cyclic behavior of composite timber-masonry wall in quasi-dynamic conditions reinforced with superelastic damper

Cited by 20 publications

References 6 publications

An experimental study on pseudoelasticity of a NiTi-based damper for civil applications

An experimental study on pseudoelasticity of a NiTi-based damper for civil applications

Seismic Vulnerability Assessment and Strengthening of Heritage Timber Buildings: A Review

A Wooden Pin Reinforcement of Ancient Chinese Wooden Temple: A Case of Daxiong Hall

Contact Info

Product

Resources

About