Development of Macro-Modeling Method for In- and Out-of- Plane Failure of URM Infill Wall

2023 Fiscal Year Annual Research Report

• Project/Area Number: 22KJ0682
• Allocation Type: Multi-year Fund
• Research Institution: The University of Tokyo
• Principal Investigator: Adnan S M Naheed 東京大学, 工学系研究科, 特別研究員(DC1)
• Project Period (FY): 2023-03-08 – 2024-03-31
• Keywords: URM wall / Out-of-plane behavior / Dynamic shake table test / Prior in-plane damage

Outline of Annual Research Achievements

The focus of the research is to simulate the out-of-plane behavior of unreinforced masonry (URM) infills. We have completed the in-plane and out-of-plane tests on three full-scale brick URM wall in RC frame specimens. Different prior in-plane damages were applied to the specimens. Afterwards, the specimen is moved to the shaking table and incremental out-of-plane shakings are applied to the specimens until the wall collapses. A typical 6-story building in Bangladesh is analyzed under expected ground motion in Dhaka city. By conducting a dynamic analysis of the building, the excitation that will be suffered by the selected frame at the top story in the out-of-plane direction is derived. The specimens represent a frame on the top story of the prototype building. This excitation is used as the reference excitation to apply out-of-plane shaking to the specimens. Motion capture systems, lasers, and accelerometers were used for measurements during the shaking test. Using the motion capture system we could capture the overall 3D behavior of the URM walls and RC frames. We are analyzing the mechanisms of wall collapse at present. Several factors responsible for the wall collapse are being investigated.