カドウ シテン ト コテイ シテン オ ユウスル カタモチ センダン コウゾウ ノ タイシン セイノウ ニ カンスル ケンキュウ

熊本大

カドウ シテン ト コテイ シテン オ ユウスル カタモチ センダン コウゾウ ノ タイシン セイノウ ニ カンスル ケンキュウ

博士(工学)熊本大

A 3D nonlinear numerical analysis of buried steel pipes at strike-slip fault crossings

A 3D nonlinear soil-pipe interaction model is presented in this study to calculate the response of steel pipes subjected to strike-slip fault displacements. The general-purpose finite element analysis program ABAQUS is used to determine the seismic response of high strength steel pipes, as well as for various surrounding soil conditions and diameter to thickness, D/t, ratios. Relatively low strength pipes X65, and high strength pipes X70 and X80, which correspond to European pipes L450, L485 and L555, respectively, have been studied for various pipe diameters and thicknesses

Nasal Cavity and Paranasal Sinus Diseases Affecting Orbit

WOS: 000357569600029PubMed: 26080260Objective: The aim of the authors was to discuss orbital complications of nasal cavity and paranasal sinus diseases. Material and Method: Patients with nasal and paranasal sinus diseases that affected orbit were retrospectively reviewed. Patients with primary orbital abnormality and those without radiologic orbital signs were excluded. Data regarding age and gender distribution, orbital and ocular findings, radiologic findings, and presence of an additional sinonasal disease were analyzed. Results: Disorders affecting orbit were categorized into 6 categories. Mean age was 41.25 +/- 22.14 (range: 6-88) years and male : female ratio was 23 : 18. Overall, there were 41 patients including 11 patients with mucocele, 9 patients with sinusitis, 7 patients with fibrous dysplasia, 4 patients with nasal polyp, 4 patients with paranasal osteoma, and 6 patients with neoplasm. Major clinical presentation was proptosis in these patients. Conclusions: Otolaryngologists should consider the possibility of sinonasal diseases to affect orbit because of vicinity of nasal cavity and paranasal sinuses to orbit. Radiologic imaging is essential to determine the extent, extension, relation with surrounding structures, and initial diagnosis of the disease, and to plan multidisciplinary management

SEISMIC CHARACTERISTICS OF THE FOLDED CANTILEVER SHEAR STRUCTURE

A newly designed structure named folded cantilever shear structure (FCSS) is proposed as an alternative seismic isolation approach that combines coupling method and roller bearings in one structure for improving earthquake resistant ability and seismic performance of mid-rise buildings. Seismic characteristics of the proposed structure have been investigated by conducting numerical analyses on the idealized vibration model with and without additional viscous dampers. Dynamic parameters such as natural frequencies,damping ratios and mode shapes, and seismic responses due to elastic dynamic response analysis were also obtained under four exemplary ground motions, namely El-Centro, Hachinohe, Miyagi and Taft earthquakes. The proposed structure consists of fix-supported shear sub-frame and movable shear sub-frame supported by roller bearings, and these fullyseparated sub-frames were rigidly connected by a connection sub-frame at the top point. This will allow all three sub-frames to behave as a unique structure to increase the overall seismic performance. It was found that the proposed structure is capable of extending natural period and minimizing accelerations, displacements and base shear forces simultaneously, when compared to ordinary structure which has the same number of storey. However, relative displacements, for the proposed structure without additional dampers, with respect to the base were obtained relatively higher. Therefore, additional viscous dampers were added between adjacent beams to connect both sub-frames with the aim of avoiding excessive displacements and increasing the damping ratio as well

SEISMIC PERFORMANCE INVESTIGATION OF THE FOLDED CANTILEVER SHEAR STRUCTURE ： AN EXPERIMENTAL STUDY

A newly designed structure named folded cantilever shear structure (FCSS) is proposed as an alternative seismic isolation approach incorporating coupling method and base isolation method in one structure for improving earthquake resistant ability and seismic performance of mid-rise buildings. The proposed structure consists of non-isolated and fully-isolated sub-frames of similar heights that are rigidly connected to each other at the top part. In this manner, it is aimed to extend the natural period of the structure and to decrease the overall seismic responses. A set of experiments were conducted to obtain dynamic parameters such as natural frequencies, damping ratios and mode shapes, and shaking table test were also carried out using 16-storey vibration model to explore seismic responses of the proposed structure under four exemplary ground motions, namely El-Centro, Hachinohe, Miyagi and Taft earthquakes. It was found that the proposed structure is capable of extending natural period and minimizing accelerations, displacements and base shear forces simultaneously. However, relative displacements of the proposed structure were relatively high with respect to base. Therefore, additional viscous dampers were added between adjacent beams to connect both sub-frames with the aim of avoiding excessive displacements and increasing the damping ratio as well. The experimental results were also compared and verified by analyzingvibration model by ABAQUS, well-known finite element software. In both studies, the proposed structure performed substantial improvement in reducing seismic responses when compared to ordinary structure of similar height