Study on dynamic response of large and small aspect ratio isolated buildings

He, Wenfu; Liu, W. G.; Yang, Qiaorong; Qin, Chuan

doi:10.1002/tal.1146

Cited by 10 publications

(6 citation statements)

References 12 publications

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“…Additionally, for high‐rise structures, rubber bearings will lose function in instances of severe earthquakes, specifically when the height–width ratio is over a certain value (which is affected by the site type and earthquake degree) . Moreover, the entire inclination angle of a high‐rise structure increases, and its integral anti‐overturning performance decreases, with an increase in the height–width ratio after isolation, which can easily cause overturning, endangering adjacent buildings . Therefore, the application of traditional seismic isolation technology in high‐rise structures is not ideal.…”

Section: Introductionmentioning

confidence: 99%

Seismic performance of high‐rise building with a rock‐slip isolation system with cables

Zhang

Yin

Chen

et al. 2020

Structural Design Tall Build

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To avoid the overturning hazard of high-rise buildings with traditional isolation technology, a rock-slip structure with cables (RSSC) was proposed to improve their seismic performance. The mechanical model was established, and the motion behaviour equation of the RSSC was derived. Shake-table tests of the RSSC were performed, and the results were compared with the corresponding finite-element model simulations. The influences of key structural parameters and earthquake motion characteristics were analysed. The study results showed that the RSSC could effectively reduce the internal seismic force response and interlayer deformation under a severe earthquake, as well as decrease the overturning probability. The seismic reduction effect was influenced by the prestressed force, the aspect ratio of the structure, and the friction coefficient between the superstructure and foundation as well as seismic site type. The motion equation derived in this paper can be used to theoretically predict the motion behaviour of RSSC. K E Y W O R D Sdynamic response, high-rise building, rock-slip, seismic isolation, seismic reduction rate, shaketable test | INTRODUCTIONWith the deepening cognition of the nature of earthquake disasters, structural seismic design has evolved from the initial simple seismic resistant designs to seismic ductility designs and isolation designs. By appropriately prolonging the structure's natural vibration period to avoid sitepredominant periods, increasing damping to dissipate seismic energy, and isolating ground motion, the seismic response of the structure may be reduced. The technology of seismic isolation has been widely applied and popularized due to its good seismic reduction effect and the convenience of repair after a disaster. For middle-and low-rise structures, the installation of rubber bearings and tuned mass dampers can effectively reduce the seismic response, [1][2][3] but studies by Itoh and Gu [4] and Liu et al. [5] have also shown that the performance of rubber bearings are significantly affected by temperature changes. Additionally, for high-rise structures, [6][7][8] rubber bearings will lose function in instances of severe earthquakes, specifically when the height-width ratio is over a certain value (which is affected by the site type and earthquake degree). [9] Moreover, the entire inclination angle of a high-rise structure increases, and its integral anti-overturning performance decreases, with an increase in the height-width ratio after isolation, which can easily cause overturning, endangering adjacent buildings. [10,11] Therefore, the application of traditional seismic isolation technology in high-rise structures is not ideal. A new isolation system needs to be proposed with the development of highrise buildings, which could not only reduce the earthquake response but also effectively reduce the possibility of overturning, and easy to repair after an earthquake.Research into rocking structures can be traced back to the 19th century. [12] Subsequently, Housner [13] found that for ...

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Section: Introductionmentioning

confidence: 99%

Seismic performance of high‐rise building with a rock‐slip isolation system with cables

Zhang

Yin

Chen

et al. 2020

Structural Design Tall Build

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“…[ 1,2 ] For long‐span or super high‐rise structures, geometric scale factors can be as large as 100 or larger. [ 3–5 ] The scale model testing relies on satisfying the similitude criteria between the model structure and the prototype structure. [ 6–8 ] When a base‐isolated structure with rubber bearings are scaled down for a shaking table test, however, it is difficult to obtain scale model rubber bearings with all of their parameters satisfying the similitude criteria.…”

Section: Introductionmentioning

confidence: 99%

Coordinative similitude method considering overturning effect for scale model testing of structures with rubber bearings

Ren

Liu

Zhu

et al. 2020

Structural Design Tall Build

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Generally, when a prototype is scaled down to a scale model, all parameters of the scale model should be designed to satisfy the similitude criteria. For a base-isolated structure with rubber bearings, however, it is technically difficult to obtain smallsized rubber bearings with the first shape factor satisfying the similitude criteria. This distortion affects the similitude ratio of the vertical stiffness of the bearings and, thus, influences the similitude ratio of the horizontal response of the structure because of the overturning effect. To solve this problem, a coordinative similitude method is proposed for scale model testing of structures with rubber bearings by adjusting configuration of the isolators to match the similitude ratio of the overturning stiffness of the isolation layer. A full-scale and two 1/3 scaled bearings were designed and tested, and their similitude relations were evaluated. Test results of the model bearings were extrapolated to the OpenSEES model of a conventional model building and a coordinative building designed based on the conventional similitude method and the coordinative similitude method, respectively. A comparison between seismic responses of two model buildings against the prototype building indicates that the coordinative similitude method has significantly larger accuracy than the traditional similitude method. K E Y W O R D S first shape factor, overturning effect, rubber bearings, scale model testing, similitude criteria, similitude method 1 | INTRODUCTION Scale models are widely used for investigating the seismic behavior of different types of structures. [1,2] For long-span or super high-rise structures, geometric scale factors can be as large as 100 or larger. [3-5] The scale model testing relies on satisfying the similitude criteria between the model structure and the prototype structure. [6-8] When a base-isolated structure with rubber bearings are scaled down for a shaking table test, however, it is difficult to obtain scale model rubber bearings with all of their parameters satisfying the similitude criteria. The geometric scale factor of the superstructure needs to be designed small enough to accommodate the dimension and payload of the shaking table, and as a result, the dimension of the scale model of the rubber bearings are designed very small in dimension. Table 1 lists the scale factors and the geometric details of some scale model rubber bearings used for shaking table tests in literature. [9-16] It can be noted that scale model rubber bearings need to be designed with diameters smaller than 150 mm in some cases. However, in these cases, the individual rubber layer thickness cannot be scaled down correctly. As stated in Kalpakidis, [14] "this is necessary when bearings are produced in an industrial environment: steel shims and rubber layers are available in specific minimum thickness that allows for reliable manufacturing." The deviation in rubber layer thickness reduces the first shape factor of the bearing, which is defined as the ratio of the effectiv...

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“…The major objective of base isolation is the decoupling of the structures from ground motions and the subsequent reduction in the superstructure responses to protect the structure and contents. Such ideas of implementing base isolation systems have been numerously investigated over the past few decades and have proven to be reliable and cost‐effective for the seismic mitigation of structural damage.…”

Section: Introductionmentioning

confidence: 99%

Stochastic optimal design of novel nonlinear base isolation system for seismic-excited building structures

Shan

Shi

et al. 2018

Struct Control Health Monit

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A novel nonlinear isolation system is numerically investigated by employing a stochastic response evaluation and experimentally studied with a small-scale preliminary prototype. The stochastic response of isolated building structures is first derived using a nonstationary random process and time-dependent equivalent linearization, regarding the nonlinear restoring force behavior of the proposed isolator. A parametric study is then performed to evaluate the potential influences of earthquake excitations properties and the optimum force ratio of the isolator that adopts the widely used Kanai-Tajimi model. According to the insights from the parametric study, the optimal design for nonlinear isolation is proposed based on a stochastic optimization procedure with the convergence of different performance objectives. The stochastically optimized isolation system is numerically studied by first comparing the present nonlinear isolator and conventional bearings. The present isolator is systematically illustrated to perform advantageously compared with conventional passive isolators in terms of base drift and structural acceleration through a relatively large group of 40 recorded seismic motions. To further investigate the efficiency of the nonlinear isolator, a benchmark building for smart base-isolation is adopted, and a comparison of the results indicates comparable performances between the proposed passive isolator and the classical active isolation system. Furthermore, an original design of the base isolation system simulating an energy dissipation mechanism is presented with favorable force-deformation behavior from experimental testing on small-scale prototypes.

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Study on dynamic response of large and small aspect ratio isolated buildings

Cited by 10 publications

References 12 publications

Seismic performance of high‐rise building with a rock‐slip isolation system with cables

Seismic performance of high‐rise building with a rock‐slip isolation system with cables

Coordinative similitude method considering overturning effect for scale model testing of structures with rubber bearings

Stochastic optimal design of novel nonlinear base isolation system for seismic-excited building structures

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