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Nishida, Akemi
Kenchikubutsu No Taishogeki Sekkei Ni Kansuru Wakushoppu 2010 Shiryoshu, p.87 - 96, 2010/03
Several organizations are energetically carrying out studies to develop numerical analytical methods to understand the effect of physical impact on structures. With the notable developments in computer technology, computational engineering, and destruction dynamics, the time response analysis of complicated impact phenomena can be easily carried out recently. However, some problems remain unresolved, e.g., the velocity effect of materials, primary response of RC structures (local response or stress wave response), secondary response (elastic-plastic response), large deformation, and contact problems. This paper reports on the present status of the numerical analysis of impact phenomena based on previous studies. This report will be helpful in formulating the guidelines for the inspection of impact resistance properties.
Sakino, Yoshihiro*; Nishida, Akemi
Kenchikubutsu No Taishogeki Sekkei Ni Kansuru Wakushoppu 2010 Shiryoshu, p.143 - 152, 2010/03
An important aspect in designing nuclear facilities is their safety, which is ensured by reducing the probability of radiation leakage, including that due to physical impact. We determined the factors necessary for testing the impact resistance of steel frame members of the facilities. Little research has been conducted on the impact resistance properties of steel frame members. After the Hyogo-ken Nanbu Earthquake, the relationship between strain rate and impact resistance properties has been studied. First, we classified destruction modes with regard to the limit state of the steel frame member against the impact force and provided an example of considering the impact velocity as an index of the required performance. Next, we reported about the studies of the strain rate dependence of materials and high-speed loading experiments on the steel member. Finally, we showed the formulated equations for finding the crack/penetration in the steel structure due to the impact force.