Experimental investigation on new mechanical systems effectiveness to reduce the coupling beam damages

Sesli H., HÜSEM M., SUNCA F., ALTUNIŞIK A. C., OKUR F. Y.

BULLETIN OF EARTHQUAKE ENGINEERING, cilt.21, sa.1, ss.535-582, 2023 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 21 Sayı: 1
  • Basım Tarihi: 2023
  • Doi Numarası: 10.1007/s10518-022-01552-3
  • Dergi Adı: BULLETIN OF EARTHQUAKE ENGINEERING
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Agricultural & Environmental Science Database, Aquatic Science & Fisheries Abstracts (ASFA), Compendex, Geobase, INSPEC, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.535-582
  • Anahtar Kelimeler: Ambient vibration test, Coupling beam, Energy dissipation, Modal parameters, New type mechanical system, Reinforcement configuration, STOCHASTIC SUBSPACE IDENTIFICATION, MODAL IDENTIFICATION, SEISMIC BEHAVIOR, AMBIENT, PERFORMANCE, MODEL, REINFORCEMENT, PARAMETERS, PLACEMENT, BUILDINGS
  • Karadeniz Teknik Üniversitesi Adresli: Evet

Özet

This article presents a study about new type mechanical systems effectiveness to reduce the coupling beam damages using non-destructive experimental measurement results. Five half-scaled reinforced concrete (RC) coupling beams were constructed to be examined in laboratory conditions. In the first three test specimens, different rebar configurations were considered to eliminate the difficulties in the construction of existing rebar layouts and to improve the seismic performances of RC coupling beams. In the last two test specimens, replaceable and innovative metallic systems were proposed to increase the energy dissipation capacity of RC coupled shear wall systems. The modal parameters for undamaged and damaged situations of the test specimens were identified by ambient vibration tests. The enhanced frequency domain decomposition method in the frequency domain and the stochastic subspace identification method in the time domain were utilized for system identification. To simulate lateral loads such as earthquakes, quasi-static cyclic tests were executed. As a result of the studies, it is observed that the damages significantly decreased the natural frequencies. Also, there is no agreement between the mode shapes before and after the loading tests. The maximum differences on natural frequencies caused by damages are calculated as 68.41% for diagonally-reinforced coupling beam (DRCB), 68.50% for mesh reinforced coupling beam with 19 degrees mesh angle (MRCB-19), 65.33% for diagonal bundled mesh reinforced coupling beam with 45 degrees mesh angle (DBMRCB-45), 29.48% for teeter-totter coupling beam (TETOD), and 21.45% for prefabricated teeter-totter coupling beam (PF-TETOD) coupling beams. Also, it is observed that the crack widths and propagations on the shear wall piers of TETOD and PF-TETOD are quite limited compared to the DRCB, MRCB-19, and DBMRCB-45 specimens. The damage propagations and changes in modal parameters have shown that the proposed mechanical systems provide the desired level of performance even under large displacements.