US 12,333,223 B2
Method for designing strong column and weak beam of steel frame beam-box column under bidirectional earthquake actions
Junxian Zhao, Guangzhou (CN); Jiaxi Guo, Guangzhou (CN); and Lijian Yan, Guangzhou (CN)
Assigned to SOUTH CHINA UNIVERSITY OF TECHNOLOGY, Guangzhou (CN)
Filed by SOUTH CHINA UNIVERSITY OF TECHNOLOGY, Guangzhou (CN)
Filed on Jul. 31, 2024, as Appl. No. 18/789,721.
Application 18/789,721 is a continuation of application No. PCT/CN2023/128636, filed on Oct. 31, 2023.
Claims priority of application No. 202311154828.8 (CN), filed on Sep. 8, 2023.
Prior Publication US 2025/0086351 A1, Mar. 13, 2025
Int. Cl. G06F 30/20 (2020.01); G06F 30/13 (2020.01); G06F 119/02 (2020.01); G06F 119/14 (2020.01)
CPC G06F 30/20 (2020.01) [G06F 30/13 (2020.01); G06F 2119/02 (2020.01); G06F 2119/14 (2020.01)] 10 Claims
OG exemplary drawing
 
1. A method for designing a strong column and weak beam of a steel frame beam-box column under bidirectional earthquake actions, comprising:
S1: designing an initial frame;
S2: defining important beam-column joints and important sections at a designed axial compression ratio according to a calculated result of a response spectrum complete quadratic combination (CQC) method of the initial frame, wherein the important beam-column joints are joints with the designed axial compression ratio not meeting checking calculation of a strong column and weak beam in a current code after calculation by the response spectrum CQC method of the initial frame, and the important sections are end sections of all upper and lower columns of the important beam-column joints;
S3: unifying bidirectional column overdesign factor (COF) values of the important beam-column joints by means of fixing thickness of middle columns of the important beam-column joints, increasing beam strength of the important beam-column joints with increase of a story height, and inversely calculating the bidirectional COF value of each joint by virtue of column resistance ΣMpc and a beam effect ΣMpb, wherein each of story edges, each of corner columns and each of middle columns are kept consistent in section;
S4: determining a degree to achieve the strong column and weak beam, and proposing two quantifiable evaluation indexes P1 and P2 with reference to performance-based standard grades C and D; and
S5: performing statistics on a damage index D of the frame after an elastic-plastic time-history analysis of a plurality of groups of natural waves, and acquiring a parameter frame meeting a target yield mechanism via the statistics performed on the damage index D in combination with an evaluation standard; if the parameter frame meets the evaluation standard, considering that the frame is capable of achieving a target strong column and weak beam yield mechanism; and if the parameter frame does not meet the evaluation standard, indicating that the designed frame under the bidirectional earthquake actions is not capable of achieving the strong column and weak beam yield mechanism meeting the evaluation standard, and then returning to S3 and re-designing the frame by enlarging the bidirectional COF values, as to improve an anti-seismic safety and a collapse resistant capacity of a structure.