Reinforced Masonry Structures

The information given below includes general limitations of the current version of KAMIN and concerns all modes of the Reinforced Masonry Structures group.

Only elements with the transverse mesh reinforcement are considered. The reinforcement meshes are either rectangular or of the "zigzag" type placed in two adjacent seams of masonry. The reinforcement of the following classes is used: A-I, Bp-I according to SNiP 2.03.01-84* (A240, Bp500 of SP 63.13330).

Limitations on the rebar diameters:

in the rectangular meshes — 3 to 6 mm;
in the zigzag meshes — 3 to 8 mm.

Limitations on the rebar spacing in meshes:

in the rectangular meshes — 3 to 12 cm;
in the zigzag meshes — 3 to 12 cm;
the rebar spacing is the same in both directions and in all meshes.

The diameters of the rebars in both directions are the same in the rectangular meshes; both zigzag meshes are also identical.

The cross-sections can be filled with reinforcement within the following limits:

the minimum reinforcement percentage is 0.1;
the maximum reinforcement percentage is 1.

In the case when the reinforcement percentage is less than the minimum value, the analysis cannot be performed. In the case when the reinforcement percentage is greater than the maximum one, the check will be performed for the maximum value of the reinforcement percentage. A respective warning message is generated in both cases.

Limitations on the materials used:

stones over 150 mm high and rubble are not used;
only mortars of grade 25 and higher are used.

The strength of the reinforced masonry in the course of its erection is not checked (i.e. formula 28 of SNiP II-22-81, KMK 2.03.07-98, formula (7.24) of SP 15.13330.2020 is not implemented).

Moreover, the check of an eccentrically compressed reinforced masonry structure with a large eccentricity will not be performed in cases when the eccentricity exceeds half of the distance between the cross-section mass center and the external edge of the compression area; the respective warning message will be generated.

See additional limitations in the description of the Local Strength of Reinforced Structures mode.

Besides the masonry with reinforcement meshes, the application enables to analyze the masonry with basalt meshes, STEKLONiT (basalt meshes should be used when the grades of mortar in the seams are not lower than M75). In this case, the user has to specify the number of courses between the meshes, the mesh grade and the data on the stone voidage.

The analysis is performed in accordance with the manufacturer's data on strength characteristics of the mesh and “Recommendations for the Design of Masonry Structures Reinforced with Basalt Meshes Produced by JSC STEKLONiT” developed by V. Kucherenko Central Research Institute for Structural Constructions.

EN 1996-1-1 does not provide any recommendations for the calculation of masonry design resistance for reinforced masonry structures with horizontal reinforcement. Therefore, the program uses the relevant recommendations of SNiP.

Moreover, for EN 1995-1-1 and DBN it is necessary to set information about masson’s height.