Seismic performance of single-layer lattice shells with VF-FPB

Abstract

Friction pendulum bearings (FPB) are recognized as a kind of effective isolation device for protecting and retrofitting an existing structure, but they are not adaptive to different seismic inputs due to the constant friction coefficient and constant radius of curvature. A new isolation bearing called variable-friction friction pendulum bearings (VF-FPB) was proposed which could overcome this limitation while retaining all the advantages of an FPB. Unlike a conventional FPB, the sliding surface of a VF-FPB was divided into several parts with different surface materials which allowed the coefficient of friction to change when the slider went across different parts. This means that the stiffness of a VF-FPB changed as the relative displacement between the slider and the sliding surface changes. In the current paper, the isolation mechanism of a typical VF-FPB was analyzed. The numerical model of a single-layer lattice shell was developed and the effect of VF-FPB installation on the structure was studied. The VF-FPBs used in the study had their surfaces divided into two parts, and it was found that an 'optimal range' exists for the dimensions of two component parts for the best earthquake isolation effect. It was concluded that VF-FPBs could improve the seismic performance of a single layer lattice shell more effectively than conventional FPBs.

Modeling and design of tuned mass dampers using sliding variable friction pendulum bearings

“…For smallφ 1 , the loops follow Eq. (25). For largē ϕ 1 , the loops change with the instantaneous amplitude of the TMD strokes: for small amplitudes (in the first instants of the transient), the loops follow Eq.…”

“…A similar arrangement has been recently adopted to realize "adaptive" seismic isolators, although several concentric regions are in that case generally admitted. VFP isolators have been postulated in [24], proposed in [25][26][27], and later analyzed by several authors (e.g., [28,29]). They are meant to outperform conventional friction pendulum bearings [30] by undergoing desired stiffness and damping modifications at specified displacement amplitudes, so that the isolation system can be optimized for multiple performance objectives [31].…”

Shaking table tests on the seismic response of truss structure with air spring‐FPS three‐dimensional isolation bearing

“…The research work has demonstrated that horizontal isolation bearings, like rubber bearings and friction pendulum systems, can effectively mitigate earthquake damage. [2][3][4][5][6] As the large-span spatial structure has the characteristics of dense vibration modes, it is more sensitive to seismic effects, especially the vertical component of the ground motions. 4 The vertical ground motion is transmitted unchanged through or even magnified by the isolation system.…”

Study of Seismic Resistance of Kiewit-8 Dome Considering Key Structural Design Parameters

“…Single-layer domes are adopted worldwidely as long-span roofs in recent decades [1][2][3] because of their advantages, such as their good aesthetic appearance, large space coverage capability and sound structural performance. Current research work is mainly focused on the structural response [4][5][6][7][8][9][10], collapse [11][12][13] of the steel structure under different loads through experiment and numerical simulation analysis [14][15][16][17][18], considering stability and buckling [19][20][21][22]. Only few reports have investigated the structural dynamic failure modes [17,19,23,24] and the seismic failure loads when the single-layer reticulated shells are subject to earthquakes.…”