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Evaluation of Stiffened end-plate Moment Connection through Optimized Artificial Neural Network

Journal of Software Engineering and Applications 2012年第3期5卷 156-167页

作者： Mehdi Ghassemieh Mohsen Nasseri School of Civil Engineering University of Tehran Tehran Iran

This study involves the development of an analytical model for understanding the behavior of the extended, stiffened end-plate moment connections with eight high strength bolts. Modeling of the connection as an assemblage of finite elements (FE) used for load deformation analysis, with material, and contact nonlinearities are developed. Results from the FE mathematical model are verified with results from the ANSYS computer program as well as with the test results. Sensitivity and feasibility studies are carried out. Significant geometry and force related variables are introduced;and by varying the geometric variables of the connections within a practical range, a matrix of test cases is obtained. Maximum end-plate separation, maximum bending stresses in the end-plate, and the forces from the connection bolts for these test cases are obtained. From the FE analysis, a database is produced to collect results for the artificial neural network analysis. Finally, salient features of the optimized Artificial Neural Network (ANN) via Genetic Algorithm (GA) analysis are introduced and implemented with the aim of predicting the overall behavior of the connection.

关键词： end-plate Moment Connection Finite Element Method Artificial Neural Network Sensitivities Analysis Genetic Algorithm

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Lumbar Disc Herniation with end-plate Fracture and Secondary Ossification Mimicking an Epidural Tumor: A Case Report

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Open Journal of Orthopedics 2013年第2期3卷 102-105页

作者： Koun Yamauchi Akira Hioki Kazunari Fushimi Kei Miyamoto Katsuji Shimizu Department of Orthopaedic Surgery Gifu University School of Medicine Gifu Japan Department of Orthopaedic Surgery Hikone Municipal Hospital Shiga Japan Department of Orthopaedic Surgery Kizawa Memorial Hosptial Gifu Japan Department of Reconstructive Surgery for Spine Bone and Joint Gifu University School of Medicine Gifu Japan

We report a unique case of lumbar disc herniation, in particular, with end-plate and surrounded by extensive ossification, mimicking a tumor with calcification. A 69-year-old female suffered from right buttock and leg pain. Computed tomography (CT) showed an intracanalar mass with calcification or ossification, which most likely originated from the vertebral body at the L1/2 level epidural space. On a T1-weighted gadolinium magnetic resonance image, the capsule of the mass was enhanced and not only the content of the mass but also that of the L2 vertebral body were partially and slightly enhanced. The final pathological diagnosis was disc herniation with end-plate fracture and secondary ossification. A combination of these pathological conditions as accompanied by both end-plate fractures and extensive secondary ossifications has not been previously reported. This rare pathological condition needs to be recognized as a differential diagnosis.

关键词： Disc Herniation Extensive Ossifications end-plate Fractures

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