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Experimental and Numerical Study on the Nonlinear Behavior of Strengthened Beams Under High Preload
Jingxian Zhao,Hongbo Liu,Zhihua Chen,Shishuo Zhang 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.5
The behavior of the H-beam strengthened with welded T-beam is tested and simulated to investigate the nonlinear behavior of fl exural members strengthened under high preload. Experimental result reveals that for the four specimens that fails predominantly by fl exural yielding, the increase in the preload results in a reduction in both the yield load and the ultimate load when the preload ratio exceeds 0.75. In the parametric numerical analysis, the eff ect of heat input is considered by means of indirect thermal-structural coupling analysis. At each preload ratio, the infl uence of the aspect ratio, which is defi ned as the ratio between section height and width, is studied. Results show that as the aspect ratio decreases, the discrepancy between the ultimate load of preloaded and unpreloaded beams increases. An empirical formula is proposed to calculate the reduction of ultimate load for beams aff ected from diff erent preload ratios considering various aspect ratios. Further studies are conducted on the welding safety. It is demonstrated that beam with the section larger than WH100 × 100 × 10 × 10 may be welded under high load safely when the preload ratio is < 0.97. What’s more, the approaches to calculate residual defl ection and increments of defl ection during welding process are proposed and verifi ed to be eff ective. Finally, the proposed theoretical method to calculate design bearing capacity of reinforced beams may be utilized to increase the accuracy of design process.
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John H. Koo(具璋會),Liu Jingxian,Zhao Aping,Wu Baozhu,Kwon Oh-sun 비교민속학회 1993 비교민속학 Vol.10 No.-
In the present study, we re-exame the plural for mation in Manchu, and attempt to describe more precisely the conditions under which various plural morphemes are used, using data drawn from resources of written and spoken Manchu. In the past, the research on this subject has been rather superficial, lacking sufficient documental support, particularly phonological interpretation. We argue that the plural formation is closely related to the vowel harmony in Manchu and to other non-linguistic factors as in some other Tungus-Manchu languages(eㆍgㆍ, Solon). The study concludes that the plural in Manchu cannot be adequately accounted for by linguistic analysis alone. It suggests that some cultural factors in the traditional Manchu society play a significant role in for ming the variety of plural forms.
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Minjia Lu,Pingping Jiang,Pingbo Zhang,Shan Feng,Zhixuan Cui,Qingkui Song,Yong Zhao,Jingxian Shen,Yiyi Fan,Huixian Lu 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.128 No.-
A novel multifunctional plasticizer, cyclohexyl triethylene glycol oligo-lactate (CTLE) was designed by atwo-step esterification reaction using green non-toxic biomass lactic acid as raw material. Its structurewas characterized by 1H NMR, FT-IR and TOF-MS. Thermogravimetric analysis (TGA), tensile test andleaching test were used to evaluate the plasticizer effect of PVC or PLA blends. Compared with commercialplasticizers, CTLE showed more outstanding thermal stability, flexibility and migration stability. Under the same condition with the addition of 50 phr plasticizer, the CTLE plasticized PVC film hadthe lowest glass transition temperature (TgCTLE-50 = 24.6 C) and the highest initial decomposition temperature(TiCTLE-50 = 265.4 C). In PLA blends, only the CTLE plasticized PLA film could recover after fracture,and the stress relaxation test results showed that the stress value of PLA-CTLE-20 drops sharply to anon-zero value, showing elastic characteristics. We estimate that the excellent plasticity of CTLE is due toits molecular structure. Among them, a large number of polar groups form intermolecular forces withPVC chain segments to make the binding tight, and the ring structure increases the free volume betweenPVC chain segments.
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