KUB-3V system

Detailed description

The Company SYSTEMA STROY Limited Liability Company

stroy@r52.ru

www.stroy.r52.ru www.kub3v.ru

Fig. 1 Floor slab level connection of the columns.

1. KUB-3V system is a composite framework without collar beams for the construction of up to 24-floored buildings at the non-seismic areas and up to 16-floored buildings at the seismic areas, and the limiting height (number of floors) of a building at the seismic areas depends on seismic load magnitude (seismicity) near construction site.

2. KUB-3V frame system complies with the up-to-date regulations of the Russian Federation (SR 20.13330.2011 “Loads and Impacts”. - regulates the loads and impacts on building structures, in particular, constant, long-term, short-term, wind, snow, and other load types. Also, this regulatory document has the data for combination and safety margin factors. SR 20.13330.2011 is an analogue of Eurocode 1, BAEL 91, DTR C2-47/NV99 (RNV 99). SR 14.13330.2014 “Construction in Seismic Areas” - regulates and establishes the requirements for seismic load adjusted calculation, space-planing solutions, design of the elements and their connections, and provision of seismic resistance for buildings and structures.

3. In 2015, the detailed calculation was done for KUB-3V (KUB-3V-ALG) system suitability for construction at the seismic areas of Algerian Peoples Democratic Republic (APDR). Static and strength calculations for the bearing structures of KUB-3V (KUB-3V-ALG) system residential building was done using Autodesk Robot Structural Analysis Professional 2016, considering the seismic impacts as per RPA 99 norms (APDR Norms). The calculations showed that KUB-3V (KUB-3V-ALG) system could be used in up to 16-floored buildings at the seismic areas of APDR.

4. The bi-directional spatial rigidity of KUB-3V system buildings is ensured by the bearing composite frame combined with the vertical diaphragm plates as well as the brace pieces as per the rising scheme, which provides the sufficient building strength. The building framework has the bi-directional reinforced internal collar beam that is in the composite frame body.

5. KUB-3V system inter-column joint is done at the floor slab level (see Fig. 1). Where the columns have max loads, the bearing steel bars are reinforced with the clamps of 8 to 10 mm dia. Class A1 bars at a pitch (distance) of 100 mm. The floor slab, where it is fixed to the column, has the enhanced pocket of 100х63х6 mm metal angle members. These technical solutions in KUB-3V system allow no bucking of working reinforcement at the inter-column fixture points, hereby avoiding the column destruction.

View А

Mounting “tack”

Weld seams with tensile forces at joint

Floor panel

Column

6. In KUB-3V system, the diaphragm plates have extra reinforcement. The diaphragm plates are installed to each other floor-by-floor, resting on the floor slab through the special metallic embedded parts fixed to the item end’s lower portion, followed by connecting the diaphragm plates with each other, floor slab and columns, producing the frame rigidity.

7. KUB-3V is a precast frame system without collar beams, it has no external collar beams. Collar beam in built into floor slab.

8. KUB-3V system’s vertical diaphragm plates are installed longitudinally and transversely. KUB-3V system’s floor slabs are fixed each other rigidly with the outstanding metal hooks. So, it produces a unified rigid monolithic floor disk.

Detailed description of KUB-3V system

Main frame parts of KUB-3V system are the floor slabs (divided into above-column, inter-column, and middle ones) and the columns. The diaphragm plates and braces are used as reinforcing members.

KUB-3V system item mounting process is carried out as follows: 1. The columns are installed onto the reinforced sleeve foundations, followed by pouring

concrete (see Fig.2). 2. After the columns are mounted, the floor panel is mounted on the column (see Fig.5). When

mounting the above-column floor panel, a conductor is used to fix the panel horizontally, strictly as per the project, and the improved support bracket fixes the panel vertically (design elevation) (see Fig.3 and 4). The above-column floor panel mounted at design elevation is fixed to the column by welding the panel shell to the column’s working reinforcement, using the steel intermediate components in the shape of angular members or plates. Then, the inter-column floor panels and the middle panels are mounted, in doing so the protruding bars at the adjacent panel ends are aligned so that a hook is formed through which opening the reinforcement bars are inserted. After mounting the reinforcement bars, the floor panel joints are covered with concrete (see Fig.9). At the same time, the above-column panel-to-column joints are covered with concrete, adding to concrete the additives that increase adhesion of fresh concrete to product concrete. The floor panels are placed at the design position using the dedicated posts to be mounted below the adjacent panel joints (see Fig. 6);

3. Then, the subsequent tier of the columns is mounted. The column joint provides forced installation during which the fixing rod of the upper column lower end shall enter the lower column upper end pipe. The steel bars are welded, provided the joint has tension forces.

4. The diaphragm plates are installed to the mounted floor. The diaphragm plates are installed floor-by-floor to each other, resting on the floor panel through the special embedded parts installed to the item end’s lower portion. The diaphragm plates are fixed to the floor panels at the upper and lower parts, installing extra reinforcement bars, and to the columns using the embedded parts mounted onto the column and diaphragm plate. Simultaneously with embedment of the floors, the diaphragm plate’s horizontal weld is covered with concrete;

Fig. 2 Installation of the columns onto the reinforced-concrete sleeve foundation.

Fig. 1 Column. Conductor. Composite support bracket. Floor slabs (above-column, inter-column, and middle)

Fig. 3 Installation of the composite support bracket

KUB-3V system

composite

support bracket

support screws

Column concrete class В25

grout of М100 cement and sand mortar

Foundation

Fig. 4 Installation of the conductor and support bracket

Fig. 5 Mounting the floor panel on the column

Fig. 6 The supporting posts are installed along the floor panel’s perimeter

conductorguide

plates

above-column

slab

rest

support

pole

pole

tripod

Fig. 7 The above-column floor panels are mounted, and then the inter-column ones

Fig. 9 The welds between the floor panels are filled with fine-grained concrete

Fig. 8 The middle floor slabs are installed last

covering the floor

joints with

concrete

inter-columnslab

above-columnslab

above-columnslab

supportpole

supportpole

supportpole

Fig. 10, 11 and 12 Construction phases

KUB-3V system framework operation description

The framework is based on the substitutive frames principle. The substitutive frames are formed in two mutually perpendicular directions by splitting the framework with vertical planes parallel to the column axes through the middles of the adjacent transverse (internal and end) spans. The substitutive frames are as a tier of the columns connected by the relative collar beams consisting of strip (slab portion) with a width equal to the distance between the middles of two transverse spans adjacent to the respective tier of the columns. (Fig. 1)

With the certain columns positioned irregularly, it is recommended in common case to review the regular frame system with the mutually perpendicular axle lines that pass through the center of all the columns. This accepts a tentative (fictitious) elastic support at the intersecting points of the axial lines, where no columns are present, which elasticity is characterized by buckling the conditional collar beam of the substitutive frame in a direction perpendicular to that under review.

The tentative collar beam is resulted by the certain laying the reinforcement bars in the structural members. (Fig. 2)

Fig. 1 Substitutive frame scheme (hidden collar beam is cross-hatched)

Fig. 2 Reinforcement enhancement scheme of the (above-column) slab for

obtaining the hidden collar beam.

It should also be noted that KUB-3V system has the brace-to-column fixture unit design developed that reduces the structure resonance possibility during forced oscillations (seismic impact). Also, the slab-to-slab fixture unit has good distribution capabilities i. e. it is tentatively rigid (with a force moment bearing capacity of 50 kN*m), which allows, when the member exceeds its max forces, redistributing the loads by hinge formation at the slab joints, without destruction of the bearing structural member itself. This gives an advantage as for the perception of dynamic influences and the resistance to the destruction of building structures.

The description of interaction between the framework members.

Main connections:

1. The column-to-floor slab connection is rigid and is done by welding the slab shell to the column’s reinforcement bars, using the steel intermediates as angle bars or plates, followed by covering the connection with concrete (see Fig. 1.1).

Fig.1.1 Floor slab-to-column connection

2. The column-to-diaphragm plate connection is rigid and is done by welding the column’s embedded parts and the composite diaphragm plate.

Fig. 2.1. Column-to-diaphragm plate connection

Connecting member as a rectangular

Floor panel

Floor panel

Column

Embedment with concrete class В25

Floor panel

Connecting member as a rectangular

Column

Embedded part of column

Column

pitch 750

3. The column-to-diaphragm plate connection is hinged and is done by hanging the floor slabs over the bracing wall, transmitting loads partially along O axis.

Fig. 3.1. Floor slab-to-diaphragm plate connection

4. The column-to-foundation is rigid and is done either by placing the column to the sleeve foundation or by welding the protruding bars from the foundation and column, followed by covering with concrete.

Fig. 4.1. Column-to-sleeve foundation connection

5. The column-to-column connection is rigid and is done by welding the reinforcement bars to each other, followed by covering the joint with concrete.

Fig. 5.1. Column-column joint

Column concrete class В25

grout of М100 cement and sand mortar

Foundation

Floor panel diaphragmdiaphragm

Floor panel

diaphragmdiaphragm

Floor panelFloor panel

Embedment with concrete class В25

6. The slab-to-slab connection is rigid (finite bending rigidity from slab plane up to 50 kN*m) and is done by covering the protruding bars from the floor slabs with concrete.

Fig. 6.1. Slab-to-slab connection

Fig. 7.1. Connection of the composite wall members of the diaphragm plate

7. Connection of the composite wall members of the diaphragm plate is rigid and is done by covering the protruding bars from the precast wall members of the diaphragm plate with concrete.

Embedment with concrete class В25

Protruding bars with a pitch 300

Protruding bars with a pitch 300Protruding bars with a pitch 300

concrete class В25

concrete class В25

General load transmission scheme.Vertical loads are transmitted from the floor slabs to the columns and then to the building foundation. Horizontal loads are transmitted from the slabs to the columns, and from the columns to the diaphragm plate walls and building foundation. Dynamic loads are perceived as a total of the building framework structural solutions i.e. the floor slabs’ framing anchors with the columns and the diaphragm plate walls, considering the rigid connection between the columns and the building foundation.

Fig. 7.2. Column-to-diaphragm plate connection

Protruding bars with a pitch 200Protruding bars with a pitch 200

Protruding bars with a pitch 200Protruding bars with a pitch 200

Column

Protruding bars with a pitch 200

Variants of the enclosing parts

The building’s bearing framework consists of internal members (columns, floors, and, if needed, braces or diaphragm plates). Practically, any facade solutions can be used as outer enclosing structures (walls): reduced-weight heat-efficient stone (incl. brick-dressed), different cladding panels, ventilated facades, stained-glass enclosures etc

1. Ceramic tiles 2. Flexible ties 3. Facing brick 4. Air clearance 5. Gas-concrete blocks 6. Thermofiller

1. Extra bricks 2. Flexible ties 3. Facing brick 4. Air clearance 5. “SKTs” blocks 6. Thermofiller 7. Heat-keeping material

1. Fixture element 2. Plaster layer 3. Gas-concrete blocks 4. Heat-keeping material

1. Fixture element 2. Facade tiles 3. Air clearance 4. Bricks 5. Heat-keeping material

1. Protective covering 2. External wall panel 3. Thermofiller 4. Heat-keeping material

For the precast reinforced-concrete framework of KUB-3V system, it is effective to use МЕТТEМ outer walls with light steel thin-walled structure technology. The outer wall light structures mean a building structure strength, reliability, durability, fire safety, noise protection, and environmental resistance. МЕТТEМ outer walls with light steel thin-walled structure technology consist of the following: the steel, galvanized, cold-rolled products used as a framework, the highly effective mineral-wool plate served as a framework aggregate, the cement-bonded particle boards used for internal finish, and the cement-bonded particle boards, fiber cement sheets etc. used for outdoor finish. The outer wall light structures are mounted with the walls partially embedded inside the building; in doing so, the upper portion of the wall is adjacent to the floor slab, the side portions are adjacent to the columns, and the lower portion partially rests on the floor slab. The outer wall installed is fixed to the upper portion using a steel plate, and to the lower portion using a steel angle bar. To the outer wall, the steel angle bar and plate are fixed using self-tapping screws, and to the floor slab these are fixed with anchor bolts.

Facing panel option and fixture system justification.

Cold-rolled products

Fiber cement sheet

Gypsum bonded particle board

Mineral-wool boards

Vent facade grillage

Seat angle

Mounting plateHeat insulationSealing bundleМЕТТEМ wall thermopanelsReinforced concrete floor diskKeramgranite

Wall panel mounting technology

Objects with KUB system composite framework without collar beams

Low-storey houses

Russia, Saint-Petersburg, Mezhozernaya str.

16, bld. А,

Multi-apartment residential building with built-in

underground parking of

5,336 sq. m in total area

Russia, Leningrad Region,

Ust-Luga settlement, Lenryba quarter,

low-storey residential complex of

10,000 sq. m in total area

Russia, Leningrad Region,

Schlüsselburg, Krasny Tract str.,

low-storey residential complex

23,000 sq. m of total area

Multi-storey houses

Russia, Leningrad Region,

Vsevolzhsky district, highroad to Lavriki, 64

variable storey residential complex 12-14-16 storeys with КУБ-3V composite

technology

88,008 sq. m of total area

Russia, Saint-Petersburg,

Pargolovo settlement

three 24-storeyed houses of the comfort-class residential complex

are erected using KUB-3V composite technology

Russia, Nizhny Novgorod, Genkina str., 61,

10-storeyed residential house of

10,490 sq. m in total area

Russia, Nizhny Novgorod,

Osharskaya str., 96,

10-storeyed residential house of

8,090 sq. m in total area

Russia, Ulyanovsk,

Octyabrskaya str. 1,2,

24-storeyed residential house

of 51,189 sq. m. in total area Car parking

of 4,475 sq. m.

Russia, Korolev,

Moscow Region,

residential complex