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Zhenke Xin,Huanhuan Wei,Yunhe Liu,Gang Liang 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.4
According to the reinforcement requirements of load-bearing members of existing transmission tower, a new type of in-situ reinforcement scheme for the angle steel T-shaped composite section is proposed. Through the compression test of 10 groups of members, the infl uence of slenderness ratio, the number of fi xtures, the number of bolt rows and other parameters on the failure mode and bearing performance of members was studied. A simulation model was established using ABAQUS software, the load-displacement curve, failure models and other aspects verify the reliability and validity of simulation results. The results show that when the slenderness ratio of member reaches a certain value, the ultimate bearing capacity of member reinforced with the reinforcement angle steel of same specifi cation and strength can be multiplied and increased several times, the slenderness ratio has little eff ect on the force transmission effi ciency of reinforcement angle steel. The number of bolt rows has a small eff ect on the ultimate bearing capacity of member, the increase rate of ultimate bearing capacity, the failure mode and the force transmission effi ciency of reinforcement angle steel, the infl uence of strength of reinforcement angle steel, the specifi cation of reinforcement angle steel on the ultimate bearing capacity, and the increase rate of ultimate bearing capacity of member obviously, the higher strength and specifi cation of reinforcement, the greater the ultimate bearing capacity of reinforced member, and the higher the rate of improvement of ultimate bearing capacity, the smaller the thickness of fi ller plate, that is the smaller the eccentricity, the higher force transmission effi ciency of reinforcement. The research results can provide experimental and theoretical basis for the reinforcement of tower structure and engineering design.
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Guo, Kai,Jiang, Naibin,Qi, Huanhuan,Feng, Zhipeng,Wang, Yang,Tan, Wei Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.6
The tubes in a heat exchanger, such as a steam generator (SG), are subjected to crossflow, and interaction between tubes and supports can happen, which can cause fretting wear of tubes. Although many experiments and models have been established, some detailed mechanisms are still not sufficiently clear. In this work, more attention is paid to obtain the regulation of impact and sliding in the complex process and many factors, such as excitation forces and clearances. The responses and contact forces were analyzed to obtain clear understanding of the influences of these factors. Room temperature tests in the air were established. The results show that the effect of clearance on the normal work rate is not monotonous and instead has two peaks. The force ratio can influence the normal work rate by changing the distribution of contact angles, which can result in higher sliding in the contact process. Fretting wear tests are conducted, and the wear surfaces are analyzed by a scanning electron microscope (SEM) and energy dispersive X-ray spectrometer (EDX). The results of this work can serve as a reference for impactsliding contact analysis between AVBs and tubes in steam generators.
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