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Experimental Study on Ultimate Strength of Concrete Filled Double Tubular Steel with Shear Connector
Masaru Shimizu,Fumihito Tatsumi,Toshiyuki Ishikawa,Atsushi Hattori,Hirotaka Kawano 한국강구조학회 2013 International Journal of Steel Structures Vol.13 No.1
Concrete Filled Tubular steel (CFT) member, which represents a superb deformability due to well-known confined effectbetween steel tube and concrete, has been used mainly as bridge pier. As a progressive composite member, Concrete FilledDouble tubular steel (CFDT), which is consist of double skin steel tubes and filled concrete between them, has been proposed. Although a lot of reports on mechanical characteristics of the CFDT member are presently published, the necessity of shearconnector for the CFDT member has not been addressed. In this research, the shear connector was installed at the interfacebetween tubes and concrete in the CFDT member. To investigate the effect of the shear connector on the bending characteristics,the four points bending test were carried out. The results show that integrating the steel tubes and concrete enhances its bearingcapacity. Furthermore, the strains of outer and inner tubes were also discussed in this paper.
Effect of Compression Overload on Fatigue Strength Improved by ICR Treatment
Toshiyuki Ishikawa,Masaru Shimizu,Hajime Tomo,Hirotaka Kawano,Kentaro Yamada 한국강구조학회 2013 International Journal of Steel Structures Vol.13 No.1
ICR (Impact Crack-closure Retrofit) treatment was developed for extending fatigue life of cracked steel structures by closing the fatigue crack opening. By applying the ICR treatment to as-welded condition, compressive stress remains at weld toe. Therefore, ICR treatment can be used for the improvement of fatigue strength of welded joint at the same level of the other fatigue strength improved techniques. If a compression overload is subjected after ICR treatment, however, the residual compressive stress at weld toe will shift the tensile stress region. Accordingly, improved fatigue strength of welded joints by ICR treatment will be reduced after the compression overloaded. In order to investigate the effect of the compression overload on fatigue strength improved by ICR treatment, fatigue tests of out-of-plane gusset specimens were carried out. As the results,fatigue strength improved by ICR treatment was hardly reduced under the compression overload condition of nominal stress of −190 MPa.
Risk Factors of Neuropathic Pain after Total Hip Arthroplasty
Kazumasa Maeda,Motoki Sonohata,Masaru Kitajima,Shunsuke Kawano,Masaaki Mawatari 대한고관절학회 2018 Hip and Pelvis Vol.30 No.4
Purpose: Pain caused by osteoarthritis is primarily nociceptive pain; however, it is considered that a component of this pain is due to neuropathic pain (NP). We investigated the effects of total hip arthroplasty (THA) in patients with NP diagnosed by the PainDETECT questionnaire. Materials and Methods: One hundred sixty-three hips (161 patients) were evaluated. All patients were asked to complete the PainDETECT questionnaire based on their experience with NP, and clinical scores were evaluated using the Japanese Orthopaedic Association (JOA) Hip Score before and after THA. Results: The patients of 24.5% reported NP before THA; 5.5% reported NP 2 months after THA. Prior to THA, there was no significant correlation between the PainDETECT score and the radiographic severity; however, there was a significant correlation between the PainDETECT score and JOA score. NP at 2 months after THA was not significantly correlated with pain scores at 1 week after THA; however, a significant correlation was observed between the preoperative pain score and NP at 2 months after THA. Conclusion: THA was useful for relieving nociceptive pain and for relieving NP in patients with hip osteoarthritis. Preoperative pain was a risk factor for NP after THA. Controlling preoperative pain may be effective for reducing postoperative NP.