Performance of sliding systems under near-fault motions

Rao, P. Bhasker; Jangid, R. S.

doi:10.1016/s0029-5493(00)00344-7

Cited by 47 publications

(5 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the 1995 Kobe earthquake, more than 60% of the severely damaged or collapsed bridges were found to experience unseating and collision/pounding due to large displacement [10]. In addition, more significant damages are induced in structures under near-fault (NF) earthquakes due to the high energy input [11,12]. It has been recognized that NF ground motions have special characteristics, such as rich longperiod spectral components, large-amplitude velocity pulses and large peak ground acceleration (PGA) and velocity (PGV), compared with far-field records.…”

Section: Introductionmentioning

confidence: 99%

Shape memory alloy (SMA)-cable-controlled sliding bearings: development, testing, and system behavior

Liang

Zheng

Fang

et al. 2020

Smart Mater. Struct.

View full text Add to dashboard Cite

This paper presents an innovative type of friction sliding bearing system incorporating shape memory alloy (SMA) cables. The study commences with cyclic tests on individual SMA cables to understand their fundamental mechanical properties. The working principle of the proposed SMA-cable-controlled friction sliding bearing (SMA-sliding bearing) is subsequently described, followed by physical tests on two SMA-sliding bearing specimens. The bearing specimens show rectangular hysteresis loops induced by Coulomb friction before the SMA cables are stretched, and afterward the load resistance and energy dissipation capacity of the bearings are increased accompanied by certain self-centering capability due to the engagement of the SMA cables. Such action is expected to effectively restrict excessive displacements of the bearings and to help reduce the residual displacement. Following the experimental study, a theoretical model of the new bearing is developed and numerical simulation is carried out. The theoretical and numerical results agree very well with the experimental results. A case study focusing on a three-span continuous bridge subjected to pulse-like near-fault (NF) ground motions is subsequently conducted, where three types of bearing system, namely, conventional sliding bearing system, SMA-sliding bearing system, and steel-cable-controlled (steel-sliding) bearing system are compared. The system-level analysis results show that the proposed SMA-sliding bearing has its superiority in superstructure displacement control, with a limited increase in the curvature ductility of the pier.

show abstract

Section: Introductionmentioning

confidence: 99%

Shape memory alloy (SMA)-cable-controlled sliding bearings: development, testing, and system behavior

Liang

Zheng

Fang

et al. 2020

Smart Mater. Struct.

View full text Add to dashboard Cite

show abstract

“…Ground vibration has different wave field characteristics due to the location of the vibration source, the type of vibration source, and the physical and mechanical properties of the soil foundation, and its vibration propagation process and attenuation law are also different. A series of important research results [1][2][3][4][5] have been carried out by scholars from various aspects such as load types and wave characteristics in soil.…”

Section: Introductionmentioning

confidence: 99%

Study on vibration isolation performance of wave impeding block in unsaturated soil foundation under an underground dynamic load

Zhang

2023

Journal of Low Frequency Noise, Vibration and Active Control

View full text Add to dashboard Cite

Based on single-phase medium theory and unsaturated porous medium theory, the vibration isolation effect of setting a single-phase solid wave impeding block (WIB) in the unsaturated soil foundation under an underground dynamic load is investigated. Using the Fourier integral transform and Helmholtz vector decomposition, the calculation formula of the dynamic response of unsaturated soil foundation under an underground dynamic load is established by combining the boundary conditions. The influence of physical and mechanical parameters such as saturation, load frequency, embedded depth of WIB, thickness of WIB, and elastic modulus of WIB on the vibration isolation performance in unsaturated soil foundation is analyzed. The results show that in the case of underground dynamic load, setting a WIB in unsaturated soil foundation could achieve a better vibration isolation effect. The surface displacement amplitude decreases significantly with the increase of saturation, load frequency, embedded depth, thickness, and elastic modulus of WIB.

show abstract

“…It has been found that most of the conventional isolation systems perform very well in low to medium magnitude of far field earthquakes . However, under near‐fault, pulse‐type ground motion, conventional isolators are often inefficient, because of the presence of long time‐period velocity pulses, which apply an impact force on the structure. Also, near‐fault motions can cause resonance in the structure because of the coupling of the fundamental mode frequency of the structure and the pulse frequency .…”

Section: Introductionmentioning

confidence: 99%

Thermally modulated shape memory alloy friction pendulum (tmSMA-FP) for substantial near-fault earthquake structure protection

Gur

Frantziskonis

Mishra

2017

Struct Control Health Monit

View full text Add to dashboard Cite

Summary Vibration control of structures under near‐fault earthquakes by employing a friction pendulum supplemented with thermally modulated shape memory alloy (SMA) springs as damper system is studied. Temperature modulation of the SMA spring during the earthquake effectively alters its hysteretic energy dissipation capacity and thereby the control efficiency of the isolation system. The response of a structure with the isolation system is evaluated through nonlinear dynamic time‐history analysis under a set of recorded near‐fault ground motions. Through temperature modulation that effectively yields a large SMA hysteretic energy dissipation, the hybrid friction pendulum system with SMA temperature modulation shows enormous control efficiency. A parametric study reveals that under a wide range of conditions, the thermally modulated SMA friction pendulum isolation system shows improved control efficiency over conventional friction pendulum and SMA friction pendulum isolation systems. Further, the temperature‐tuned SMA hysteresis loops substantially suppress the high frequency components of earthquake motions, thus reducing the possibility of damage to the structure.

show abstract

Performance of sliding systems under near-fault motions

Cited by 47 publications

References 14 publications

Shape memory alloy (SMA)-cable-controlled sliding bearings: development, testing, and system behavior

Shape memory alloy (SMA)-cable-controlled sliding bearings: development, testing, and system behavior

Study on vibration isolation performance of wave impeding block in unsaturated soil foundation under an underground dynamic load

Thermally modulated shape memory alloy friction pendulum (tmSMA-FP) for substantial near-fault earthquake structure protection

Contact Info

Product

Resources

About