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					        INTEGRATION OF THE
         TECHNOLOGIES FOR
      STRUCTURAL ASSESSMENT

              AIDICO
 Construction Technological Institute
          Valencia - Spain


1st MEMSCON Event
 07/10/10, Bucharest                    AIDICO
    CONTENTS

 The important of the Investigation in the process:
    pathology-assessment-refurbishment.
 Applied Technologies
       3D Scanner-laser
       Infra-red Thermography
       Sonic Test
       Modal analysis. OMA
   Numerical Simulation. 3D-Model.
   Structural Assessment.


                        1st MEMSCON Event
                         07/10/10, Bucharest           AIDICO
    SEFDEC- PROJECT

                                             BELL TOWER



 CONCRETE
WATER TANK
  DEPOSIT




CABLE STAYED BRIDGE




                      1st MEMSCON Event
                       07/10/10, Bucharest                AIDICO
       PATHOLOGIES-ASSESSMENT-REFURBISHMENT

How does it plays the Investigation in the process: Pathology– Assessment- Refurbishment



                                  Pathology Process     Problem – Research - Intervention
   - Observation       CAUSES                           PROBLEMS
                                     Pathology Study




                  Examination –> Pre-assessment –> Analysis -> Assessment



                        The ANALYSIS considers the following procedure: admisible threshold,
    - Analysis          Diagnostic Patterns, crack or defect pattern, expert systems, numerical
                        analysis, technical tests,…


   - Assessment         The ASSESSMENT should be attend the causes and the serious of the
                        pathologies…and to include the recommended theraphy (usage limitation,
                        demolition, re-integration, reinforcement,…



                                 1st MEMSCON Event
                                  07/10/10, Bucharest                                       AIDICO
APPLIED TECHNOLOGIES




         1st MEMSCON Event
          07/10/10, Bucharest   AIDICO
3D-SCANNER LASER




         1st MEMSCON Event
          07/10/10, Bucharest   AIDICO
INFRA-RED THERMOGRAPHY




         1st MEMSCON Event
          07/10/10, Bucharest   AIDICO
         SONIC TESTING

                                                             f res     c
                                                                                 2d
                                                       The founded values for the velocities are the
                                                       following:

                                                       - P-wave time of flight -> Tp= 820 us
                                                       - P-wave velocity -> Vp = 3040 m/s
                                                       - S-wave time of flight -> Tp= 1320 us
                                                       - S-wave velocity -> Vs = 1811 m/s

Since from other parameters as the average concrete apparent density      = 2,3 kg/m3,
it has been calculated the elastic modulus and constants:
           - Young modulus E -> Ed= 18,5 GPa
           - Shear or Rigidity modulus G -> Gd = 7,54 GPa

In these case, it is assumed the final modulus as the half of the dynamic
that comes from the real test (sonic test), therefore it is assigned an elastic modulus
about   10 GPa, so that 9,25 GPa has been adopted.

                                      1st MEMSCON Event
                                       07/10/10, Bucharest                                         AIDICO
OPERATIONAL MODAL ANALYSIS:
ACCELEROMETRIC TESTS




                 MEMS1
         MEMS7


                          MEMS2


         MEMS8    MEMS3
                          MEM4




                                     FLEXURAL 2          FLEXURAL 1
 FLEXURAL 1
   1,416 Hz
        MEMS9      MEMS5 MEMS6         1,487 Hz            2,755 Hz




                                  1st MEMSCON Event
                                   07/10/10, Bucharest                AIDICO
OPERATIONAL MODAL ANALYSIS:
RADAR INTERFEROMETRIC




              1st MEMSCON Event
               07/10/10, Bucharest   AIDICO
          STRUCTURAL MODELLING

E, , 




          FLEXURAL MODE 1                              TORSIONAL MODE
                                     FLEXURAL MODE 2


                            1st MEMSCON Event
                             07/10/10, Bucharest                  AIDICO
    STRUCTURAL ASSESSMENT




Static Analysis:       ˆ
                     E
Gavitational Tension: Water mass and own weight
                                                                  Rc   (shear)   ~   7.5 MPa
    Maximum Principal Stress : Shear tension
                                                     E = 10 GPa
    Minimum Principal Stress : Compression tension
                                                                  Rc            ~
                                                                        (compression)

                                                                            20 MPa

                           1st MEMSCON Event
                            07/10/10, Bucharest                                         AIDICO
        STRUCTURAL ASSESSMENT
        STRONG WIND PRESSURE
                                           Compression
                      80 P                     8.7 MPa   Shear 4.3 MPa
WIND                 -30 S
ACTIONS:
Pressure & Suction




                             Compression                  Shear 7.3 MPa
                     120 P
                                11.5 MPa
                     -45 S




                              1st MEMSCON Event
                               07/10/10, Bucharest                   AIDICO
        CONCLUSIONS

   Nondestructive technology could be applied to gather
    information:
       To know the mechanical properties of the structural
        elements,
       To supply confident data that comes from the experimental
        tests to numerical simulation,
       To allow comparing experimental behaviour from different
        techniques (modal tests)
       To match the numerical simulation and experimental test
        (mechanical parameters & boundary conditions).
       To perform structural assessment against events.
                         1st MEMSCON Event
                          07/10/10, Bucharest                AIDICO

				
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posted:7/2/2011
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