Shaking table tests on the multi-dimensional seismic response of long-span grid structure with base-isolation

Xu, Weizhi; Du, Dongsheng; Wang, Shuguang; Liu, Weiqing; Li, Weiwei

doi:10.1016/j.engstruct.2019.109802

Cited by 21 publications

(11 citation statements)

References 20 publications

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“…Results of Staggered Isolated Structures. The results in this paper are consistent with the results of the multidimensional seismic response shaker test study [27]. The horizontal dynamic response of the base-isolated model is weakened.…”

Section: Analysis Of Interlayer Shearsupporting

confidence: 88%

Study on the Response of Staggered Floor Isolated Structures in Mountainous Areas under Three-Dimensional Earthquakes

et al. 2022

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As coal mines are susceptible to safety accidents due to earthquakes, the requirements for structures in coal mining areas such as fire control centers and hospitals are higher, so base isolated structures, including staggered isolated structures, adapted to mountainous terrain are used in mining areas. The staggered floor isolated structure is a kind of isolated structure in mountainous areas which developed from the base-isolated structure. The theoretical research on staggered isolated structures is relatively few, and the theoretical research lags behind the practical application of engineering. In this paper, three staggered floor isolated structures with different heights of staggered floors are established. The responses of structures under one-dimensional, two-dimensional, and three-dimensional earthquakes are analyzed by the finite element dynamic time-history analysis method. The structural torsion, interstory shear force, maximum axial force, and floor displacement of the structure are compared. Due to the asymmetric characteristics of the staggered floor isolated structure, the center of stiffness of the staggered floor isolated structure deviates from the center of mass, which produces not only horizontal vibration but also obvious torsional vibration. The input of earthquakes in different dimensions also makes a difference in the response of the structure. The location between the upper isolated layer and the first floor above the upper isolated layer is a weak point of the structure. The results obtained in this study are distinguished from traditional basic isolated structures, which supplements the theoretical research of the staggered isolated structure.

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Section: Analysis Of Interlayer Shearsupporting

confidence: 88%

Study on the Response of Staggered Floor Isolated Structures in Mountainous Areas under Three-Dimensional Earthquakes

et al. 2022

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“…Taking the El Centro seismic record of the Imperial Valley earthquake as an example, according to equations (31) and (32), the average period is T m � 0.56 s and Ω m � 11.20 rad/s. According to the fitting results in Table 1, f 1 in equation (29) can be expressed as follows: 3 sd,res − 0.9ζ 2 sd,res + 0.84ζ sd,res + 0.04.…”

Section: Advances In Civil Engineeringmentioning

confidence: 99%

“…In the past two decades, many major earthquakes have occurred in the world, which have caused many casualties and considerable property damage [1][2][3]. Both structural and nonstructural failures induced by seismic excitation are responsible for the losses.…”

Section: Introductionmentioning

confidence: 99%

A New Method to Calculate Additional Damping Ratio considering the Effect of Excitation Frequency

Wang

et al. 2020

Advances in Civil Engineering

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The additional damping ratio (ADR) is an important indicator for evaluating the damping effect of structures with energy-dissipation devices. Most existing methods for determining the ADR require an analysis of the structural dynamic response and complex iterative calculations. An innovative simplified calculation method for determining the ADR of a structure supplemented by nonlinear viscous dampers is proposed. This method does not require the dynamic response of the structure to be calculated and only requires the structural characteristics, excitation frequency, and damper parameters. In this study, several typical calculation methods for the ADR were analysed. Then, a calculation formula for the ADR was derived with consideration of harmonic excitation under the condition where the excitation frequency is equal to the structural natural frequency, without calculation of the structural dynamic response or an iterative process. The effect of the excitation frequency on the calculated value of the ADR with different damping exponents was studied. Accordingly, the response spectrum average period (RSAP) was considered as the excitation period of ground motion to evaluate the excitation frequency, and a simplified calculation method for the ADR considering the effect of the excitation frequency characterised by the RSAP of the ground motion was established. Finally, the accuracy and effectiveness of the proposed method were verified by comparison with ADRs calculated using other methods.

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“…Nevertheless, the research information on seismic behavior of this kind of floor system is still limited currently. It should be noted that the large-span structure has some special dynamic characteristics, such as dense characteristic frequencies and numerous vertical vibration modes [15,16]. erefore, long-span structures are sensitive to seismic effects, especially vertical earthquakes.…”

Section: Introductionmentioning

confidence: 99%

“…Some studies showed that the vertical ground motions cause significant amplification in the moment demands of large-span horizontal members, and the dynamic response induced by vertical acceleration is much larger than the effect of dead load [17]. Moreover, the research on horizontal seismic response of large-span floors also identified that significant vertical acceleration and displacement responses can be induced by horizontal seismic excitation, which leads to an amplification of the vertical action effect of the structure [16]. To promote the application of the COF system in practical engineering, especially in high earthquake intensity regions, it is necessary to conduct in-depth investigations on the seismic behavior of the COF system.…”

Section: Introductionmentioning

confidence: 99%

Seismic Behavior of Large‐Span Open‐Web Floors Consisting of I‐Shaped Steel Chords and Steel Tube Webs

Zhou

Yong

Chen

et al. 2020

Advances in Civil Engineering

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A composite large-span open-web floor (COF) system is introduced in this paper, which is composed of I-shaped steel chords, steel tube webs, and concrete slabs. One COF specimen was fabricated and tested under cyclic loadings. The failure process and hysteretic curve of the specimen were discussed in detail. Moreover, a finite element (FE) model was developed and verified by experimental results. A parametric study was performed to examine the effects of the concrete strength, steel strength, section steel thickness, and structural height. The parametric study demonstrates that the effects of the steel strength, section steel thickness, and structural height on the load-displacement hysteretic curve are proved to be significant. As for the bearing capacity and stiffness degradation of the COF system, the influence of the steel strength and section steel thickness is stronger than that of the concrete strength and structural height. Additionally, it is also found that the influence of the steel strength and section steel thickness on the energy dissipation is remarkable; the energy dissipation ability of the structure decreased with increasing the steel strength and increased with increasing the thickness of section steels.

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Shaking table tests on the multi-dimensional seismic response of long-span grid structure with base-isolation

Cited by 21 publications

References 20 publications

Study on the Response of Staggered Floor Isolated Structures in Mountainous Areas under Three-Dimensional Earthquakes

Study on the Response of Staggered Floor Isolated Structures in Mountainous Areas under Three-Dimensional Earthquakes

A New Method to Calculate Additional Damping Ratio considering the Effect of Excitation Frequency

Seismic Behavior of Large‐Span Open‐Web Floors Consisting of I‐Shaped Steel Chords and Steel Tube Webs

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