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Yao Tang,Yongchang Cai,Dongyang Feng 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.11
In this paper, three full-scale box culvert specimens with different defect cases were designed and carried out based on the field investigation results of typical cross-sections in Shanghai Drainage Line. According to the test data, the cracking development, load-deformation curve, failure modes, and the ultimate bearing capacity of the specimens were analyzed and studied. In addition, a finite element model (FEM) based on a plastic damage model of concrete was established, and its parameters were determined by the experimental results and sensitivity analysis. The FEM simulation results agreed well with the experiment. On the basis of the characteristic curve of "load-deflection" and the failure modes obtained from the test and numerical simulation, an ultimate bearing capacity evaluation model and practical method were established and put forward, which can provide references for the safety evaluation, prevention as well as reinforcement of large diameter rectangular drainage box culverts with defects.
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Junpeng Yang,Qi Cai,Yongchang Liu,Chong Li,Zongqing Ma,Huijun Li 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.4
The W-modifi ed Ti 2 AlNb-based alloys synthesized at 1100 °C by spark plasma sintering were solution treated at 1300 °Cfor 4 h and then aged at 800–1000 °C for 1 h. The phase composition, microstructure evolution, and microhardness of theaged alloys are investigated in this study. A signifi cant enhancement of hardness, ~ 750 HV, is obtained in the alloy aged at900 °C, while that of the one without W addition is only ~ 470 HV. The hardness is also higher than that of common β-Ti andTi–6Al–4V alloys. As the ageing temperature increases, the B2/O structure evolves from B2 + O colonies to Widmannstättenstructure, followed by a “disordering to ordering” procedure. This process also involves the variation of the angle betweenadjacent O phase from 90° to 60°. Specifi cally, a herringbone Widmannstätten B2 + O structure is constructed in the alloysaged in the α 2 + B2 + O phase region, which is related to the diff usion of W and the substitution of W for Nb in the latticeof B2 or O.
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