Transactions of Materials and Heat Treatment

Title：Influence of eccentric load on large double-column prestressed frame

Authors： Liu Donglin Liu Yanyan

Unit： Lanzhou Jiaotong University

KeyWords： double-column hydraulic press prestressed frame eccentric load condition vertical eccentric load prestress pretension coefficient

ClassificationCode：TG315

year,vol(issue):pagenumber：2022,47(5):175-180

Abstract：

For the double-column push-up forging hydraulic press, the eccentric load condition in the forging process was analyzed, the transfer path of eccentric load was studied, and the objectivity that the vertical eccentric load always exists was clarified. Then, the mechanical model of double-column prestressed frame was established, and the stress state of frame under the eccentric load was analyzed. Combined with the research on the working process of the frame, the calculation method of prestress was determined. The example calculation results show that the forging eccentricity increases from 100 mm to 250 mm, the pretension coefficient of the frame increases from 1.12 to 1.45 under the horizontal eccentric load condition and from 1.14 to 1.77 under the vertical eccentric load condition, and the prestress of the frame is greater to ensure its integrity under the vertical eccentric load condition. Through the simulation analysis, the closed state of indirect joint surface between column and lower beam was further compared. The results show that compared with the horizontal eccentric load condition, the frame is easier to crack under the vertical eccentric load condition, and the maximum gap is larger. For the vertical eccentric load condition, the vertical deflection of column decreases significantly with the increasing of the pretension coefficient, and when the pretension coefficient increases to 1.8, the maximum gap tends to 0 mm, and the feasibility of the calculation method is verified. Based on the study of eccentric load condition and prestressed frame, it is suggested that it is necessary to consider the influence of vertical eccentric load in the calculation process for the frame prestress.

Funds：

国家自然科学基金资助项目（51265022）；甘肃省科技计划资助项目（145RJZA187）

作者简介：刘东林（1993-），男，硕士研究生，E-mail：18246638209@163.com；通信作者：刘艳妍（1964-），女，学士，教授，E-mail：liuyy@mail.lzjtu.cn

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