Table 11 Coefficients of the principal constitutive curve of the BS.

From: Investigation of the shear performance of multi-key block bonding surfaces without connecting reinforcement for precast elements

Category

Roughness

Type of BS

ts0 (tt0) (MPa)

ks(kt) (MPa/mm)

k´s(k´t) (MPa/mm)

µs

µd

1

≥ 4 mm

M3、W

0.97ft + µsσ

6.9

0.5

2.32

1.28

2

≥ 3 mm

M2、T、M1

0.69ft + µsσ

10.4

0.57

2.25

1.16

3

<3 mm

CJ、PSP

0.54ft + µsσ

12.3

0.47

1.80

1.04

  1. ts0 (tt0) = the tangential peak stresses, ks(kt) = the initial tangential stiffness, k´s(k´t) = the stiffness in the damage descending segment, ks(kt) and k´s(k´t) based on the average value of the secant stiffness derived from the test curves, µs = the coefficient of static friction, µd = the coefficient of dynamic friction, and ft = the axial axial tensile strength of the concrete.
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