Lattice modeling for the influence of geometrical patterns of 3D spacer fabric on tensile behavior of concrete canvas

Abstract

Tensile behavior of concrete canvas (CC) mainly depends on the geometric patterns of 3D spacer fabric. A lattice model is proposed to model the three-dimensional structure of CC to investigate the influence of geometric patterns of 3D spacer fabric on the tensile behavior of CC. The stress intensity factor is also applied into the lattice model to study the crack development of CC subjected to tensile load. The simulation results are compared to the experiments to verify the model. Finally, the influence of geometric pattern of outer layer and spacer yarns on tensile behavior of CC are simulated based on our proposed lattice model. The results indicate that the tensile strength of CC increases as the loop unit size of outer surface decreases or the amount of spacer yarns increases; the tensile strength of CC with rhombus loop unit of outer surface layer is higher than that of CC with rectangle loop unit. The tensile strength of CC significantly increases with the increasing inclination angle of spacer yarns in 3D spacer fabric. Furthermore, CC specimens subjected to uni-axial tensile exhibit a multi-cracking behavior, the average crack spacing of specimen decreases with the decreasing inclination angle of spacer yarns in tensile direction.

Textile reinforcement structures for concrete construction applications––a review

“…219 Li et al investigated different spacer fabric geometries used in Concrete Canvas and developed a lattice model predicting the tensile behavior of Concrete Canvas based on the geometry of the 3D spacer fabric. 220 Recent development efforts focused on specialized spacer fabrics easing the combination of multiple textiles during construction. By reducing the distance between the reinforcement layers of the spacer fabric at the sides of the textile, multiple textiles can be overlapped without increasing the resulting thickness of the element.…”

Finite element analysis on global and local deformation behavior of 3D spacer fabric

“…Its two faces and core are knitted with flexible multifilament and stiff monofilament. [1][2][3] Taking a typical warp-knitted spacer fabric shown in Figure 1(a)-(c) as an example, the two outer layers were knitted with a soft 300D/96F polyester multifilament yarn with each filament having a diameter of 17.9 mm, while the spacer layer was knitted with a rigid polyester monofilament with a diameter of 200 mm on a double needle bar warp knitting machine. 4,5 The two independent outer layers are deformable.…”