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This is to certify that your paper entitled «The Effect of Mass Irregularity in Height on the Seismic Behavior of a Steel Bending Frame System Equipped with the Buckling-restrained Brace under the Simultaneous Effect of the Vertical and Horizontal Components of Near-field Earthquakes» was indexed with 8 pages, in the CIVILICA citation database, code COI:UACECONF01_087, after evaluation and approval of the referees of the "1st International Conference on Urban Planning, Architecture, Civil Engineering, Environment 2021.

While offering our congratulations on the indexation of your paper, please be informed that this certificate is prepared based on the information submitted by the secretariat of the above conference and the information contained in the CIVILICA database, and the accuracy of its content can be inquired at any time through link provided at the bottom of the page or scanning the code image.