Report: 191

Building Type: Dual precast RC system (IMS5, IMS8, IMS12, IMS18)

Country: Cuba

Author(s): Grisel Morejon Blanco, Kenia Leyva Chang, Dario Candebat Sanchez, Zulima Rivera Alvarez, Yelena Berenguer Heredia, Madelin Villalon Semanat, Dominik H. Lang, Abdelghani Meslem

Last Updated: 01/26/2016

Regions Where Found: Santiago de Cuba

Summary: Dual precast RC system, formed by a simple modular network of one or two precast slabs and four columns, which are joined by a pre-stressed joint to form a frame structure. This construction type is not widespread. They were built in one time period by the Yugoslavian engineers using Yugoslavian code.

Length of time practiced: 25-60 years

Still Practiced: Yes

In practice as of: 1985-1990

Building Occupancy: Residential, 50+ units

Typical number of stories: 5-18

Terrain-Flat:

Terrain-Sloped:

Comments:

Plan Shape: Rectangular, solid

Additional comments on plan shape: Number of stories: 5 (IMS5), 8 (IMS8), 12 (IMS12), 18 (IMS18)

Typical plan length (meters):

Typical plan width (meters):

Typical story height (meters):

Type of Structural System: Structural Concrete: Precast Concrete: Prestressed moment frame with shear walls

Additional comments on structural system: Gravity: Precast RC slabs, transferring the gravity loads to the beams and columns and finally to the footingsLateral: Shear walls provide the lateral resistance; these walls are reinforced-concrete panels of 15 cm thickness, confined between two adjacent columns.

Gravity load-bearing & lateral load-resisting systems: Dual precast RC system (RC frames and shear walls that take more than 50% of the lateral load)

Typical wall densities in direction 1: >20%

Typical wall densities in direction 2: >20%

Additional comments on typical wall densities:

Wall Openings:

Is it typical for buildings of this type to have common walls with adjacent buildings?:

Modifications of buildings:

Type of Foundation: Shallow Foundation: Reinforced concrete isolated footingShallow Foundation: Mat foundation

Additional comments on foundation: Shallow foundation; reinforced-concrete isolated footing is used for buildings of 5 stories, sometimes cast-in-situ; for buildings of 8, 12 and 18 floors foundation mats are used.

Type of Floor System: Precast concrete floor with reinforced concrete topping

Additional comments on floor system: Consisting of precast post-tensioned slabs; the beams are formed when the joints between the horizontal elements (slab-slab) are constructed forming the rigid diaphragm.

Type of Roof System: Precast concrete roof with reinforced concrete topping

Additional comments on roof system: Consisting of precast post-tensioned slabs; the beams are formed when the joints between the horizontal elements (slab-slab) are constructed forming the rigid diaphragm.

Additional comments section 2:

Who is involved with the design process? Owner

Roles of those involved in the design process:

Expertise of those involved in the design process:

Who typically builds this construction type? Other

Roles of those involved in the building process:

Expertise of those involved in building process:

Construction process and phasing:

Construction issues:

Is this construction type address by codes/standards? Yes

Applicable codes or standards: Yugoslavian code

Process for building code enforcement:

Are building permits required?

Is this typically informal construction?

Is this construction typically authorized as per development control rules?

Additional comments on building permits and development control rules:

Typical problems associated with this type of construction:

Who typically maintains buildings of this type? Other

Additional comments on maintenance and building condition:

Unit construction cost: IMS5 and IMS8: 50 CUC/m2 IMS12 and IMS: 80 CUC/m2

Labor requirements:

Additional comments section 3:

Patterns of occupancy:

Number of inhabitants in a typical building of this construction type during the day: >20

Number of inhabitants in a typical building of this construction type during the evening/night: >20

Additional comments on number of inhabitants:

Economic level of inhabitants: Middle-income classHigh-income class (rich)

Additional comments on economic level of inhabitants:

Typical Source of Financing: Other

Additional comments on financing:

Type of Ownership: Other

Additional comments on ownership:

Is earthquake insurance for this construction type typically available?: No

What does earthquake insurance typically cover/cost:

Are premium discounts or higher coverages available for seismically strengthened buildings or new buildings built to incorporate seismically resistant features?:

Additional comments on premium discounts:

Additional comments section 4:

Damage patterns observed in past earthquakes for this construction type: There are no reports of damage from past earthquakes for this type of buildings (also not from former Yugoslavia or other countries where this constructive system can be found).

Additional comments on earthquake damage patterns:

The main reference publication used in developing the statements used in this table is FEMA 310 “Handbook for the Seismic Evaluation of Buildings-A Pre-standard”, Federal Emergency Management Agency, Washington, D.C., 1998.

The total width of door and window openings in a wall is: For brick masonry construction in cement mortar : less than ½ of the distance between the adjacent cross walls; For adobe masonry, stone masonry and brick masonry in mud mortar: less than 1/3 of the distance between the adjacent cross walls; For precast concrete wall structures: less than 3/4 of the length of a perimeter wall.

Additional comments on structural and architectural features for seismic resistance:

Vertical irregularities typically found in this construction type: Other

Horizontal irregularities typically found in this construction type: Other

Seismic deficiency in walls: The columns are designed to resist axial loads only; column joints are carried out in areas of greater bending moments;the reinforcement detailing do not comply with the requirements for areas of high seismic hazard; In fact, the construction joints and details were designed considering regions of low-moderate seismicity (Yugoslavia) while the buildings are located in high seismic regions. Previous studies addressing the vulnerability of IMS18 showed that failures by axial load with flexure of shear walls on the first floors can occur, also drifts are expected to be greater than the provided limits as per the Cuban code; it was also found that the main reason for failure of this typology is the corrosion of the steel reinforcement due to water leakages.

Earthquake-resilient features in walls:

Seismic deficiency in frames:

Earthquake-resilient features in frame:

Seismic deficiency in roof and floors:

Earthquake resilient features in roof and floors:

Seismic deficiency in foundation: Unknown deficiencies

Earthquake-resilient features in foundation:

For information about how seismic vulnerability ratings were selected see the Seismic Vulnerability Guidelines

Additional comments section 5: Moderate vulnerability

Additional comments on seismic strengthening provisions:

Has seismic strengthening described in the above table been performed?

Was the work done as a mitigation effort on an undamaged building or as a repair following earthquake damages?

Was the construction inspected in the same manner as new construction?

Who performed the construction: a contractor or owner/user? Was an architect or engineer involved?

What has been the performance of retrofitted buildings of this type in subsequent earthquakes?

Additional comments section 6:

• Brzev, S., Scawthorn, C., Charleson, A.W., and Jaiswal, K. (2012). GEM basic building taxonomy, Report produced in the context of the GEM Ontology and Taxonomy Global Component project, 45 pp.

• Cuban National Bureau of Standards (2013). Norma Cubana NC46: 2013, Construcciones sismoresistentes - Requisitos basicos para el diseno y construccon, 1. Edicion, January 2013, Officina Nacional de Normalizacion (NC), Habana, Cuba.

• Jaiswal, K.S., and Wald, D.J. (2008). Creating a global building inventory for earthquake loss assessment and risk management, U.S. Geological Survey Open-file report 2008-1160, 106 pp.

• Lang D.H., Meslem, A., Lindholm C., Blanco, G.M., Chang, K.L., Sanchez, D.C., and Alvarez, Z.R. (2015). Earthquake Loss Evaluation (ELE) for the City of Santiago de Cuba (Cuba), Report no. 15-015, Kjeller - Santiago de Cuba, October 2015, 90pp.

• Medina A., Escobar E., Ortiz G. Ramirez M., Duiaz L., Mondelo F., Montejo N., Rodriguez H., Guevara T. and Acosta J. (1999). Reconocimiento geologo-geofisico de la cuenca de Santiago de Cuba, con fines de Riesgo Sismico. Empresa Geominera de Oriente, Santiago de Cuba. 32 pp.

• Mendez I., Ortiz G., Aguller M., Rodriguez E., Llull E., Guevara T., Lopez T., Guilart M., Mustelier M., Gentoiu M. and Lay M. (2001). Base de datos digital de los levantamientos regionales de Cuba Oriental. Empresa Geologo-Minera de Oriente (E.G.M.O.) y Oficina Nacional de Recursos Minerales (O.N.R.M).

• Morejon Blanco, G., Leyva Chang, K., Candebat Sanchez, D., Rivera Alvarez, Z., Berenguer Heredia, Y., Villalon Semanat, M., Lang, D.H., and Meslem, A. (2015). Building Classification Scheme for the City of Santiago de Cuba (Cuba), Report no. 15-010, Kjeller - Santiago de Cuba, August 2015, 30 pp.

• SNIP (1963). Construction in Seismic Regions: Norms of Designing, SNIP II-A. 12-62, Moscow, 1963.