Damage Deformation of Flexure‐Yielding Steel‐Reinforced Concrete Coupling Beams: Experimental and Numerical Investigation

Abstract

SRC coupling beams offer many significant advantages, including the reduction in section depth, reduced congestion at the wall boundary region, improved degree of coupling for a given beam depth, and improved deformation capacity. In this paper, 7 half-scale flexure-yielding SRC coupling beams designed according to Chinese approach have been tested under cyclic loads. Detailed parameters such as aspect ratios, steel reinforcement ratios, and steel flange-web ratios were systematically studied, and the damage behavior of SRC coupling beams were presented in this paper. The test results show that the aspect ratio, steel ratio, and steel flange-web ratio have great influence on the damage behavior of SRC coupling beams. Three-dimensional nonlinear finite element models were constructed and benchmarked through comparison with test results for both global and local damage deformation behavior. Based on the material damage and strength degradation, four performance levels were defined and corresponding chord rotation limits were obtained through the verified numerical analysis.

Numerical Simulation of Mesodamage Behavior of Concrete Based on Material Point Method

“…In order to implement the constitutive model in the material point program, at the beginning of the simulation test, a random number r between 0 and 1 will be assigned to all the material points of mortar and ITZ. At each time step, Advances in Civil Engineering the survival probability P s of each material point is calculated according to equations (7) and (8) and compared with the random value r assigned in the beginning. If the survival probability P s of the material point is bigger than r, the material point is considered to be undamaged, and the damage variable D is taken as 0.…”

“…Since the mesoscale study of concrete mechanical behaviors can obtain a more fundamental understanding of concrete damage and failure mechanisms and provide a deep insight into macroscopic mechanical behaviors, it has become a hot research area of concrete material and achieved fruitful results. Up to date, the finite element method (FEM), which helps many researchers to simulate the effects of multiphase distribution on the mechanical response and damage properties of concrete [5][6][7][8][9][10][11][12][13][14][15][16][17][18], is still being a dominant method to model different behaviors of concrete at macro-and mesoscales. However, with the development of computing technology and numerical methods, more and more approaches are being employed to explain the damage mechanism of concrete structure [19][20][21][22][23][24][25].…”

Effect of Web Openings on Flexural Behaviour of Underground Metro Station RC Beams under Static and Cyclic Loading

“…Many researchers have studied the seismic behaviour of structural components [18][19][20]. Herrera et al [21] carried out a large-scale experimental study to investigate the cyclic behaviour of T-shaped moment-resisting frame (MRF) cantilever beams with openings placed in the midspan.…”