【正文】 文翻譯 16 of beamcolumn is the same. On the premise that material amount is a definite value, the section dimension of beamcolumn middle joint of standard floors in middle frame is estimated by general estimation method and then pare it with calculated section dimension by the results of and . Estimate the section dimension of beamcolumn according to general methods: Beam: Column: Then the material amount of beamcolumn is Therefore, the lateral displacement stiffness of column is ( ) However, the linear stiffness ratio is beyond the application scope of the basis of , calculate the section dimension of beamcolumn under the condition that A is a definite value, and adjust the section dimension of beamcolumn, as: ,Then, Now the lateral displacement stiffness is ( ) Then, obviously, Now, The linear stiffness of beamcolumn is within the scope of , so it is reasonable linear stiffness ratio and within the engineering application scope. 4 Conclusion (1) It can be seen from the example hereinabove: on the premise that the total consumed material quantity A of frame beamcolumn is a definite value during the preliminary design in the standard frame structure, the beam width remains unchangeable if the section dimension of the beamcolumn is adjusted slightly. In this example, beam width remains unchangeable, adjust the column height from 650mm 外文翻譯 17 to 600mm and then adjust column height from 500mm to 560mm if the column dimension width remains unchangeable, the maximum value of the column lateral displacement stiffness will be obtained. proves that the linear stiffness ratio of beamcolumn at this moment satisfies the formula (10), so the derived beamcolumn section dimension satisfies the applied scope of the reasonable linear stiffness ratio during the preliminary design in the standard frame structure. (2) The research method obtaining the maximum value of column lateral displacement stiffness by Lagrange Multiplier Method can be widely used to research on the similar frame structures. For example it can be used to research the reasonable linear stiffness ratio of middle frame bottom, side frame, and similar engineering structures. (3) The conclusion of the research will provide certain reference to research on other aspects of frame structure. For example, the method obtaining the maximum value of column lateral displacement stiffness by adjusting its section dimension has great importance in antiseismic design of frame structures. Increasing section dimension of columns can effectively control the axial pression ratio and shear pression ratio, and hence improve structural ductility and reduce loss due to earthquake disasters. 外文翻譯 18 References [1] Tao Ji, Zhixiong Huang, Multistory and Highrise Reinforced Concrete Structure Design, Michanical Industry Publishing House, Beijing, 2021. [2] Shihua Bao, Highrise Building Structure of New Resource and Hydropower Publishing House of China, Beijing, 2021. [3] Ahmed Ghobarah and A. Said, “Shear strengthening of Beamcolumn Joints”, Journal of Engineering Structures,2021, 24（ 7） , . [4] Ahmed Ghobarah, Seism Resistance Design amp。 Seism Resistance Methods [M], Maruzen Company, Limited. 1963. [5] Aichuan. Jiang, Structural Optimization Design, Qinghua Publishing House, Beijing, 1986. [6] Xi’an Zhao, Highrise Reinforced Concrete Structure Design, Architecture＆Building Press Beijing, China, 2021. [7] . Bakir and . , “A New Design Equation for Predicting the Joint Shear Strength of Monotonically Loaded Exterior Beamcolumn Joints”, Journal of Engineering Structures, 2021, 24（ 8） , . [8] Huanling Meng and Pusheng Shen, “Research on Behaviors of Frameshear Wall Structures Based on Stiffness Degradation”, Journal of Railway Science and Engineering,2021, 3(1), –17.