Experimental beyond design and residual performances of full-scale viscoelastic dampers and their empirical modeling     

Shiang-Jung Wang  I-Chen Chiu  Chung-Han Yu  Qun-Ying Zhang  Kuo-Chun Chang 《地震工程与结构动力学》2019,48(10):1093-1111

Most past researches relevant to viscoelastic (VE) dampers, regardless of analytical and experimental ones, aimed at their design (or pre-damage) performance. In reality, however, under maximum considered or greater shaking caused by earthquakes, the shear deformation of the VE dampers installed in a structure may exceed or is even much larger than their nominal design range, thus leading to damage to the VE material. Under this circumstance, the structural design might become not conservative when the viscoelastically damped structure is a retrofit design or is not a supplemental damping design. Therefore, in this study, the beyond design and residual performances of the full-scale VE dampers after suffering damage are experimentally probed and compared with their design (or pre-damage) performance tested before. To have more engineering sense in practice, some suitable and conservative empirical post-damage models through considering reduction factors in the Kelvin-Voigt model for assessing the beyond design and residual performances of the full-scale VE dampers after suffering damage are recommended.  相似文献   

Maritime safety for fishing boat operations and avoidable hijacking in Taiwan     

Yi-Che Shih  Chiu L. Chou  Wen-Yan Chiau   《Marine Policy》2010,34(2):349-351

Taiwanese fishing boats have been hijacked many times this year. Trouble at sea can usually be attributed to communication problems, inappropriate management and an unfair salary system. The majority of boats hijacked are high sea (long-line) fishing boats. Although fishery authorities ask the fishing boats to set up vessel monitoring systems (VMSs), this precaution has not been sufficient. There is a further need for improved management by the fishing boat owner and for an improved employment policy for seamen. The issue of maritime security is not new, but it remains a major concern and continues to be a threat to Taiwan and other countries. To date, there have been many cases of hijacking in the South China Sea. This paper analyzes the reasons for the hijackings and provides potential strategies to prevent future incidents.  相似文献