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A multi-dimensional earthquake isolation and mitigation device for long-span reticulated structures is a type of newly invented passive control device. In order to acquire the earthquake isolation and mitigation effect of the new devices on long-span reticulated structures under horizontal excitations, the pseudo-dynamic tests for a 1:3 modeled long-span reticulated structure with a size of 3 m × 3 m with and without the devices are carried out. Horizontal dynamic responses of the structure with and without the devices are compared, and the earthquake isolation and mitigation effect of the devices is evaluated under the horizontal excitations. It can be shown from the experimental and finite element numerical results that the proposed new devices have a good effect on earthquake isolation and mitigation on long-span reticulated structures under horizontal earthquake excitations. [ABSTRACT FROM PUBLISHER]

The earthquake excitation is a complicated multidimensional motion, which will cause the damage or even collapse of structures. Consequently, some measures to prevent structure failure must be taken under multidimensional excitations, especially for long-span reticulated structures and high-rise buildings. Many earthquake isolation or mitigation devices have been manufactured to reduce the horizontal dynamic responses of structures, but there are few reports concerning the device isolating and mitigating earthquake actions both in horizontal and vertical directions simultaneously. In this paper, a new multidimensional earthquake isolation and mitigation device for long-span reticulated structures is developed and tested under different cases. Effects of excitation frequency and amplitude on vertical properties of this device are studied. Then, the modified equivalent standard solid model is proposed to describe the vertical properties of the device. Experimental and numerical studies show that this device has good capability of energy dissipation in vertical direction. [ABSTRACT FROM PUBLISHER]

Abstract: The earthquake excitation is a kind of complicated multi-dimensional motion. It is not safe and accurate enough if only considering the horizontal earthquake excitation, especially for complex and important engineering structures. Therefore, anti-earthquake measures for engineering structures considering multi-dimensional excitations have become an extremely important research topic. In this paper, a new multi-dimensional earthquake isolation and mitigation device (MEIMD) is developed and tested under different cases at both horizontal and vertical directions. Effects of excitation frequency and displacement amplitude on both horizontal and vertical properties of this device are considered. At the same time, a modified equivalent standard solid model is proposed, which can effectively describe the effects of frequency and displacement on the horizontal and vertical properties of the device. Research indicates that the MEIMD possesses high-energy dissipation capacity at both horizontal and vertical directions and the proposed model can accurately simulate the value of the storage modulus and the loss factor. [Copyright &y& Elsevier]