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Seismic Performance of Concrete Columns with Innovative Seven- and Eleven-Spiral Reinforcement
Ou, Yu-Chen,Ngo, Si-Huy,Roh, Hwasung,Yin, Samuel Y.,Wang, Jui-Chen,Wang, Ping-Hsiung American Concrete Institute 2015 ACI structural journal Vol.112 No.5
<p>This research proposes innovative seven- and 11-spiral transverse reinforcement to replace two- and six-spiral reinforcement, respectively, to decrease spiral size to address the issue of spiral fabrication in large columns. Moreover, this research proposes using large reinforcing bars or H-shaped steel as longitudinal reinforcement to reduce the potential of reinforcing bar cage failure. The objectives of this research were to investigate the seismic performance of seven- and 11-spiral columns and the effect of using large reinforcing bars and H-shape steel as longitudinal reinforcement. Cyclic tests of columns showed that seven- and 11-spiral columns, even with less amounts of transverse reinforcement, exhibited higher ductility capacities than tied columns. The use of H-shaped steel as longitudinal reinforcement increased ductility and energy dissipation of the column. Among ACI 318, Caltrans BDS, and Caltrans SDC methods to estimate probable moment strength, only the Caltrans SDC method produced conservative results for all columns examined.</p>
Chen Ou,Jun Liu,Lei Sun,Zhi-min Xiao,Yi Cheng,Ming-qing Liu,Fu-tian Zhao,Meng-yang Zhen,Yue Wang 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.6
The dynamic response and stability of building structures under accidental loads such as earthquake, explosion, and impact have been focused by experts. The significant influence will be induced once the damaged structure begins to collapse. In this study, a reinforced concrete frame structure model was designed and tested to study the dynamic response law of the structure under the condition of the failure of the middle column of the model structure, the remaining structure successively failed the load-bearing column and continued to be subjected to impact load and uniform load. The analytical method was used to calculate the ultimate uniform load subjecting to the structure under the failure of four load-bearing columns, because its value was less than the load in this test, the structure collapsed. The finite element calculation model was established, and compared the simulation results to the test results to verify its rationality. Then, the influence of the impact energy and the structural stores on the dynamic response of the structure were analyzed. The results showed that the peak value of the dynamic response of the damaged structure did not increase strictly with the increase of the number of failure columns, which may be related to the sequence of failure columns.
Plastic hinge length of circular reinforced concrete columns
Yu-Chen Ou,Raditya Andy Kurniawan,Dimas Pramudya Kurniawan,Nguyen Dang Nguyen 사단법인 한국계산역학회 2012 Computers and Concrete, An International Journal Vol.10 No.6
This paper presents a parametric study of the plastic hinge length of circular reinforced concrete columns using a three-dimensional finite element analysis method, and using the Taguchi robust design method to reduce computational cost. Parameters examined include the longitudinal reinforcing ratio, the shear span-to-depth ratio, the axial force ratio and the concrete compressive strength. The study considers longitudinal reinforcement with yield strengths of 414 MPa and 685 MPa, and proposes simplified formulas for the plastic hinge length of circular reinforced concrete columns, showing that increases in plastic hinge length correlate to increases in the axial load, longitudinal reinforcing and shear span-todepth ratios. As concrete strength increases, the plastic hinge length decreases for the 414 MPa case but increases for the 685 MPa case.
Anchorage Performance of Headed Deformed Bars in Exterior Beam-Column Joints Under Cyclic Loading
Yu-Chen Ou,Hana Astrid Canseco,Dimas P. Kurniawan 대한토목학회 2017 KSCE Journal of Civil Engineering Vol.21 No.7
The anchorage performance of headed deformed bars anchored in inter-story exterior beam-column joints under cyclic load was examined based on a test database with 118 test data. A proposed performance index based on the ACI 318 development length equation was used to evaluate the anchorage performance of the headed deformed bars of the specimens in the database. The results of the evaluation showed that the anchorage performance was positively correlated with the axial load, amount of joint transverse reinforcement parallel to the direction of applied shear, and head bearing area ratio, and was negatively correlated with the clear bar spacing and column moment ratio. Based on the evaluation, limits on design parameters (i.e., the minimum clear bar spacing, head bearing area ratio, concrete and steel strengths) were proposed. It was found that all the specimens in the test database showed satisfactory seismic performance if they satisfied the development length equation of the ACI 318 code and the proposed limits on design parameters.
Kuo-Tai Chen,Sung-Tai Wei,Chun Tseng,Su-Wei Ou,Li-Wei Sun,Chien-Min Chen 대한척추신경외과학회 2020 Neurospine Vol.17 No.sup.
With the trend of minimally invasive spine surgery, full-endoscopic lumbar discectomy (FELD) has evolved with the advancement of the optics and instruments. Regarding the techniques, the transforaminal and interlaminar approach remain the major accesses in FELD. Transforaminal endoscopic lumbar discectomy (TELD) is an effective and safe treatment for herniation of the lumbar disc. More and more evidence supports the TELD in enhancing recovery and decreasing surgical complications. However, the learning curve of TELD remains steep, especially at the L5–S1 level. The iliac crest height is an essential factor in the operability of TELD at the L5–S1 level. In the situation of the high iliac crest, TELD is technically challenging even for an experienced surgeon. Therefore, the authors report their techniques of TELD with foraminoplasty step-by-step and the preliminary results in this report.
Liu, Xue-Ou,Huang, Yu-Bei,Gao, Ying,Chen, Chuan,Yan, Ye,Dai, Hong-Ji,Song, Feng-Ju,Wang, Yao-Gang,Wang, Pei-Shan,Chen, Ke-Xin Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.3
Background: Evidence for associations between dietary factors and breast cancer risk is inconclusive among Chinese females. To evaluate this question, we conducted a systematic review of relevant case-control and cohort studies. Methods: Studies were systematically searched among 5 English databases (PudMed, ScienceDirect, Wiley, Clinicaltrials.gov, and Cochrane) and 3 Chinese databases (CNKI, WanFang, and VIP) until November 2012. Random effects models were used to estimate summary odds ratios (ORs) and the corresponding 95% confidence intervals (CIs). Results: Thirty one case-control studies and two cohort studies involving 9,299 cases and 11,413 controls were included. Consumption of both soy and fruit was significantly associated with decreased risk of breast cancer, with summary ORs of 0.65 (95% CIs: 0.43-0.99; I2=88.9%, P<0.001; N=13) and 0.66 (95% CIs: 0.47-0.91; $I^2$=76.7%, P<0.001; N=7), respectively. Consumption of fat was significantly associated with increased risk of breast cancer (OR=1.36; 95% CIs: 1.13-1.63; $I^2$=47.9%, P=0.088; N=6). There was nonsignificant association between consumption of vegetables and breast cancer risk (OR=0.72; 95% CIs: 0.51-1.02; $I^2$= 74.4%, P<0.001; N=9). However, sensitivity analysis based on adjusted ORs showed decreased risk of breast cancer was also associated with consumption of vegetables (OR=0.49; 95% CIs: 0.30-0.67). Conclusion: Both soy food and fruit are significantly associated with decreased risk of breast cancer among Chinese females, and vegetables also seems to be protective while dietary fatexerts a promoting influence.
Chien-Min Chen,Jae Hwan Lee,Meng-Yin Yang,Shang-Wun Jhang,Kai-Sheng Chang,Su-Wei Ou,Li-Wei Sun,Kuo-Tai Chen 대한척추신경외과학회 2023 Neurospine Vol.20 No.1
Objective: Sacroiliac joint (SIJ) pain is a common cause of chronic low back pain. Full-endoscopic rhizotomy of lateral branches of dorsal rami innervating SIJ is a potential option for patients’ refractory to medical treatment. The full-endoscopic rhizotomy is sometimes challenging under fluoroscopic guidance. This study is to evaluate the effectiveness of the navigation-assisted full-endoscopic rhizotomy for SIJ pain. Methods: The study was a retrospective match-paired study that enrolled consecutive patients undergoing navigation-assisted full-endoscopic rhizotomy for SIJ pain. The patient demographics, clinical outcomes, and operative parameters of endoscopic rhizotomy were compared with conventional cooled radiofrequency ablation (RFA) treatment. Results: The study enrolled 72 patients, including 36 patients in the endoscopic group. Thirty-six patients in the cooled RFA group were matched by age as the control. The follow-up time was at least 1 year. Patient characteristics were similar between the groups. The navigation-assisted endoscopic rhizotomy operation time was significantly longer than the cooled RFA. The visual analogue scale (VAS) for pain and Oswestry Disability Index (ODI) significantly decreased after each treatment. However, the between-group comparison revealed that the VAS and ODI of the patients after endoscopic rhizotomy were significantly lower than those after the cooled RFA group. There were no postoperative complications in the study. Conclusion: Navigation-assisted full-endoscopic rhizotomy is an alternative to SIJ pain treatment. Integrating intraoperative navigation can ensure accurate full-endoscopic rhizotomy to provide better durability of pain relief than the cooled RFA.