located
under the cross-section selection buttons. The Cross-section
dialog box will display the current cross-section with its sizes and the
position of the center of mass.The mode is used to check the strength and stability of separate or built-in axially compressed columns. It implements requirements of Sec. 4.1-4.4 of SNiP II-22-81 (Sec. 7.1-7.4 SP 15.13330). The columns are assumed to have a constant cross-section throughout their height. Rectangular, T-shaped, round, and ring cross-sections are available.
The dialog box of this mode contains the following tabs:
The General tab contains general data on the structure: the importance factor, age of masonry, working life, presence of damage, and data on the material — the types and grades of the stones/bricks and mortars used. All these data are described in the Materials section.
The Design tab contains data on the cross-sections of a column. Select
one of the following cross-section types using the respective buttons:
rectangular, T-section, round, and ring, and enter thesizes for the cross-section.
To verify the sizes, click the button located
under the cross-section selection buttons. The Cross-section
dialog box will display the current cross-section with its sizes and the
position of the center of mass.
You also have to specify the height of the column, the longitudinal force, and the factor for sustained load. It should be noted that the load is defined by the design value of the combination of loads and the factor for the sustained load in compliance with SNiP 2.01.07-85*.
It is possible to include the self-weight of the column in the check. To do it, check the respective checkbox and specify the specific weight of masonry. In this case the weight of the column will be added to the specified load.
The Effective Height In XoY Plane and Effective Height In XoZ Plane tabs are used to determine the effective height factors in both principal planes, XoY and XoZ.
The actual geometric height of a column should be multiplied by these factors calculated according to Sec. 4.3, 4.4, 6.7 of SNiP II-22-81, KMK 2.03.07-98 (Sec. 7.3, 7.4, 9.11 of SP 15.13330.2020). You can also enter the values of factors different from the design ones.
Different boundary conditions for columns are given in the figure:
a) b)
c) d)
(а) according to Sec. 4.3, a of SNiP II-22-81, KMK 2.03.07-98 (Sec. 7.3, a of SP 15.13330);
(b) according to Sec. 4.3, b of SNiP II-22-81, KMK 2.03.07-98 (Sec. 7.3, b of SP 15.13330);
(c) according to Sec. 4.3, c of SNiP II-22-81, KMK 2.03.07-98 (Sec. 7.3, c of SP 15.13330);
(d) according to Sec. 4.3, d of SNiP II-22-81, KMK 2.03.07-98 (Sec. 7.3, d of SP 15.13330) and is used when an element is clamped in the floor slabs.
The cases (b) and (d) require the following additional information:
(b) type of the building (single-span or multi-span);
(d) type of the floor slabs (precast, monolithic, or timber) and the distance between transverse rigid structures.
Clicking the Calculate button will display values of the effective height factors.
The user can also enter his/her values for the effective height factor in the result fields by clicking the Other button.
The Damage tab provides data on fire and mechanical damages which can be taken into account when checking a structural member. The possible structural damages are described in the Damage section.
The fire damages are taken into account along the whole perimeter of a column cross-section and are assumed to be uniform throughout the height of the column.
Mechanical damages of the masonry are also assumed uniform throughout the column height.