Hu Yukun, Ma Pengfei, Yao Jitao
School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an, China.
Key Lab of Structural Engineering and Earthquake Resistance, Ministry of Education, Xi'an, China.
PLoS One. 2023 Mar 2;18(3):e0282430. doi: 10.1371/journal.pone.0282430. eCollection 2023.
The in-plane seismic behavior of unreinforced masonry (URM) structures is closely related to the aspect ratio of the wall and vertical load. The purpose of this study was to investigate the difference between the failure mode of the model and the horizontal load using the finite element model (FEM) under the action of aspect ratio (0.50 to 2.00) and vertical load (0.2 MPa to 0.70 MPa). The overall macro model was established using the Abaqus software, and the corresponding simulation was performed. The simulation results indicate that: i) the shear failure and flexural failure were the main failure modes of masonry walls; ii) shear failure could be viewed as the main failure mode of the model when the aspect ratio was less than 1.00; however, the flexural failure was considered to be the main failure mode of the model once the aspect ratio was greater than 1.00; iii) when a vertical load of 0.20 MPa was applied to the model, only flexural failure was observed, regardless of whether the aspect ratio of the model increased or decreased; the flexural shear mixed failure was captured within the range of 0.30 MPa- 0.50 MPa; the shear failure was the main failure mode within the range of 0.60 MPa- 0.70 MPa; and iv) the wall with an aspect ratio less than 1.00 could bear a higher horizontal load, and the increase in vertical load can significantly improve the horizontal load of the wall. In contrast, once the aspect ratio of the wall reaches or exceeds 1.00, the increase in the vertical load has little effect on the increase in the horizontal load of the wall.
无筋砌体（URM）结构的平面内抗震性能与墙体的高宽比和垂直荷载密切相关。本研究的目的是利用有限元模型（FEM），研究在高宽比（0.50至2.00）和垂直荷载（0.2MPa至0.70MPa）作用下，模型破坏模式与水平荷载之间的差异。使用Abaqus软件建立了整体宏观模型，并进行了相应的模拟。模拟结果表明：i）剪切破坏和弯曲破坏是砌体墙的主要破坏模式；ii）当高宽比小于1.00时，剪切破坏可视为模型的主要破坏模式；然而，一旦高宽比大于1.00，弯曲破坏则被认为是模型的主要破坏模式；iii）当模型施加0.20MPa的垂直荷载时，无论模型高宽比增大或减小，均仅观察到弯曲破坏；在0.30MPa - 0.50MPa范围内出现弯剪混合破坏；在0.
