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  PROJECTS - REDESIGN AND STRENGTHENING OF EXISTING BUILDINGS


CUBUS HELLAS – PIONEERS IN BUILDING RETROFIT AND STRENGTHENING


It is now internationally acceptable the fact that repairing the damages after a small scale earthquake is not enough, as it was believed till recently. Earthquake highlights the  building weaknesses, which in a following earthquake will become the reason for greater damage and collapse. We are able now, by using modern means, to locate building weaknesses even before earthquake. The most resolute way of strengthening is the addition of walls and core structures.

Buildings are in danger

Reasons of seismic vulnerability of buildings are mostly:

  • Lower prequisities in terms of resistance as set by older Codes (bef. 1990). Modern Codes require that the seismic resistance of the building is about five times greater

  • Bad design of the bearing structure with asymmetries and discontinuation (pilotis, short columns, eccentrical stair-cores), causes concentration of inelastic deformation and member failures

  • Lack of ductility, the ability of members to deform inelastic without failing, due to absence of stirrups

  • The role of walls in reducing building deformations was fermerly not known. It was believed that the structure ought to be flexible and infill walls to fail letting the structure vibrate freely

  • The foundation behaviour in seismic deformations of the building was not sufficiently considered. Differential settlement of the ground under not-connected pad footings under increased seismic action was not taken into account

  • Malconstruction as well as changes of the bearing structure, holes for the mechanical equipment, later additions to the building vertically and horizontally

Retrofit means safety

Reduction of applied deformation and a subsequent increament in building strength is mainly achieved by means of the addition of new walls and cores. Thus the new elements take over the role to transfer the forces to the ground and therefore unload the old bearing structure. For a good retrofit the following conditions should be met:

  • Redesign of the bearing structure with cores and walls. Architecture, serviceability, constructive possibilities and cost should be taken into account and should be compared to human safety and the value of the building

  • Precise static and dynamic calculation, that simulates the strengthened buildings’ real behaviour under earthquake using non-linear methods (push over, etc.)

  • Statistical estimation of seismic force regarding several levels of earthquake. Evaluation of the area seismic activity, of the foundation ground features, of the distance from active geological faults is required, in order to define the magnitude of seismic action for redesigning the structure

  • Detailed design of the new elements, the way they connect to the existing bearing structure, their foundation. The design should be careful so that all “weak points” for possible damage in a future earthquake are taken into account and treated properly. The redesign requires knowledge, experience, full drawing support and adequate supervision during construction

  • Checking of the behaviour of all the existing bearing elements, in order to realize if they are able to withstand the new standards of loading and displacement after the strengthening without damages and brittle failures

  • Checking of the behaviour of existing non bearing elements, such as masonry, additions, brickwalls, glass-facade, electromechanical equipment, stairs and elements next to escape exits

  • Selection of proper materials often with special characteristics, for the construction of the new elements, their connection to the existing elements, the strengthening of particular existing elements and sometimes their retrofit

  • Proven experience of the engineers in strengthening of buildings by means of addition of walls and cores

The company cubus Hellas is specialized in retrofit and strengthening of residential buildings, offices, schools, hotels, commercial and industrial buildings, hospitals e.t.c. and has developed great engineering and technological experience since 1990.

 



STRENGTHENING OF PRIVATE UNIVERSITY


STRENGTHENING OF PRIVATE UNIVERSITY - STRENGTHENING BY ADDITIONAL CORES AND WALLS
   


STRENGTHENING OF SCHOOL BUILDING - DAMAGE ESTIMATION UNDER EARTHQUAKE, PUSH OVER METHOD


STRENGTHENING OF SCHOOL BUILDING - STRENGTHENING OF FOUNDATIONS AND WALLS
   


STRENGTHENING OF OFFICE BUILDINGS -
DAMAGE ESTIMATION UNDER EARTHQUAKE, PUSH OVER METHOD


STRENGTHENING OF OFFICE BUILDINGS -ADDITIONAL CORES AND WALLS AND STRENGTHENING OF EXISTING CORES
   


STRENGTHENING OF OFFICE BUILDING -
DAMAGE ESTIMATION UNDER EARTHQUAKE, PUSH OVER METHOD


STRENGTHENING OF OFFICE BUILDING -
STRENGTHENING BY ADDITIONAL EXTERNAL CORES
   


STRENGTHENING OF EIGHT FLOOR BLOCK OF APPARTMENTS - DAMAGE ESTIMATION UNDER EARTHQUAKE, PUSH OVER METHOD


STRENGTHENING OF EIGHT FLOOR BLOCK OF APPARTMENTS - ADDITIONAL EXTERNAL CORES AND STRENGTHENING OF DIAPHRAGM
   


STRENGTHENING OF HOTEL AND HOSPITAL -
REDESIGN OF HOTEL BY NEW WALLS AND CORES


STRENGTHENING OF HOTEL AND HOSPITAL -
STRENGTHENING OF HOSPITAL WITH NEW WALLS
   


BOLDING CONCRETE


CONNECTING ADDITIONAL WALLS AND CORES
   

 

 
 

 
  NEWS / COMMUNICATION

STATIK-5P
Push over analysis accor-ding to the structural inter-ventions regulations


STATIK-5P continues to lead the static inelastic analysis of space frames, according to the specifications of the new Greek regulations for stru-ctural interventions (Nove-mber 2005 issue).


20/03/2007

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CONFERENCES

Static inelastic aseismic analysis of buildings (push over analysis) with STATIK-5H according to the new Greek structural interventi-ons regulations

Athens, June , 21 & 22, 2007.

Applications to participate up to May 25, 2007.

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Static and aseismic analysis of steel structures with STATIK-5-STAHL and detail-ing with Prosteel-3D 17

Athens, May, 24 & 25.
Applications to participate up to April 30.


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