Impact testing of a wall-floor-wall reinforced concrete structure

Ari Vepsä, Seppo Aatola, Kim Calonius, Matti Halonen

Research output: Contribution to conferenceConference articleScientific

Abstract

Resistance of nuclear power plant (NPP) civil structures against a crash of a commercial airplane is verified with numerical models or semi-empirical and analytical formulas. In order to be reliable, used models and methods have to be validated against reliable empirical data, which is scarcely available in public. Vibrations in an entire building induced by such highly dynamic impact is one of the arising phenomenon that need to be assessed in order to ensure the functionality of critical equipment and components of a NPP. In order to obtain experimental data for model validation, a series of three impact tests was carried out with a structure having a front wall, a floor and a rear wall, each being 150 mm thick. In addition to impact tests, the structure was subjected to modal testing before and after the first impact test and then after the last impact test. A soft projectile having mass of 50 kg was used in the impact tests with the impact velocities ranging between 111.2 and 116.8 m/s. In this context, a soft projectile is considered to be much more deformable than the structure that it impacts against, resembling the fuselage of an aircraft. In addition to experimental data generation, the aim of the tests was to study how the vibration propagates from the hit point, how it gets damped and how these properties change when the structure is already damaged. Propagation of vibration was measured in the tests with six displacement sensors and accelerometers, spaced along the propagation path of vibration. In addition, strains in the reinforcement were measured at ten locations. The change in response of the structure between the consecutive impacts depended on the type of quantity measured: the displacements increased somewhat from a test to the next one while the accelerations decreased in a similar manner. At the same time no clear behaviour could be identified for the reinforcement strains. In each case, the main frequencies at which the response occurred decreased slightly from a test to the next one with the frequencies being slightly lower than the ones identified in the modal analyses carried out under same conditions.
Original languageEnglish
Publication statusPublished - 2015
Event22nd International Conference on Structural Mechanics in Reactor Technology 2013, SMiRT 22 - San Francisco, United States
Duration: 18 Aug 201323 Aug 2013
Conference number: 23

Conference

Conference22nd International Conference on Structural Mechanics in Reactor Technology 2013, SMiRT 22
Abbreviated titleSMiRT 22
CountryUnited States
CitySan Francisco
Period18/08/1323/08/13

Fingerprint

Impact testing
Projectiles
Concrete construction
Nuclear power plants
Reinforced concrete
Reinforcement
Aircraft
Fuselages
Accelerometers
Numerical models
Sensors
Testing

Keywords

  • aircraft crash
  • soft impact
  • impact testing
  • vibration
  • damping

Cite this

Vepsä, A., Aatola, S., Calonius, K., & Halonen, M. (2015). Impact testing of a wall-floor-wall reinforced concrete structure. Paper presented at 22nd International Conference on Structural Mechanics in Reactor Technology 2013, SMiRT 22, San Francisco, United States.
Vepsä, Ari ; Aatola, Seppo ; Calonius, Kim ; Halonen, Matti. / Impact testing of a wall-floor-wall reinforced concrete structure. Paper presented at 22nd International Conference on Structural Mechanics in Reactor Technology 2013, SMiRT 22, San Francisco, United States.
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Vepsä, A, Aatola, S, Calonius, K & Halonen, M 2015, 'Impact testing of a wall-floor-wall reinforced concrete structure' Paper presented at 22nd International Conference on Structural Mechanics in Reactor Technology 2013, SMiRT 22, San Francisco, United States, 18/08/13 - 23/08/13, .

Impact testing of a wall-floor-wall reinforced concrete structure. / Vepsä, Ari; Aatola, Seppo; Calonius, Kim; Halonen, Matti.

2015. Paper presented at 22nd International Conference on Structural Mechanics in Reactor Technology 2013, SMiRT 22, San Francisco, United States.

Research output: Contribution to conferenceConference articleScientific

TY - CONF

T1 - Impact testing of a wall-floor-wall reinforced concrete structure

AU - Vepsä, Ari

AU - Aatola, Seppo

AU - Calonius, Kim

AU - Halonen, Matti

N1 - Project: 102145

PY - 2015

Y1 - 2015

N2 - Resistance of nuclear power plant (NPP) civil structures against a crash of a commercial airplane is verified with numerical models or semi-empirical and analytical formulas. In order to be reliable, used models and methods have to be validated against reliable empirical data, which is scarcely available in public. Vibrations in an entire building induced by such highly dynamic impact is one of the arising phenomenon that need to be assessed in order to ensure the functionality of critical equipment and components of a NPP. In order to obtain experimental data for model validation, a series of three impact tests was carried out with a structure having a front wall, a floor and a rear wall, each being 150 mm thick. In addition to impact tests, the structure was subjected to modal testing before and after the first impact test and then after the last impact test. A soft projectile having mass of 50 kg was used in the impact tests with the impact velocities ranging between 111.2 and 116.8 m/s. In this context, a soft projectile is considered to be much more deformable than the structure that it impacts against, resembling the fuselage of an aircraft. In addition to experimental data generation, the aim of the tests was to study how the vibration propagates from the hit point, how it gets damped and how these properties change when the structure is already damaged. Propagation of vibration was measured in the tests with six displacement sensors and accelerometers, spaced along the propagation path of vibration. In addition, strains in the reinforcement were measured at ten locations. The change in response of the structure between the consecutive impacts depended on the type of quantity measured: the displacements increased somewhat from a test to the next one while the accelerations decreased in a similar manner. At the same time no clear behaviour could be identified for the reinforcement strains. In each case, the main frequencies at which the response occurred decreased slightly from a test to the next one with the frequencies being slightly lower than the ones identified in the modal analyses carried out under same conditions.

AB - Resistance of nuclear power plant (NPP) civil structures against a crash of a commercial airplane is verified with numerical models or semi-empirical and analytical formulas. In order to be reliable, used models and methods have to be validated against reliable empirical data, which is scarcely available in public. Vibrations in an entire building induced by such highly dynamic impact is one of the arising phenomenon that need to be assessed in order to ensure the functionality of critical equipment and components of a NPP. In order to obtain experimental data for model validation, a series of three impact tests was carried out with a structure having a front wall, a floor and a rear wall, each being 150 mm thick. In addition to impact tests, the structure was subjected to modal testing before and after the first impact test and then after the last impact test. A soft projectile having mass of 50 kg was used in the impact tests with the impact velocities ranging between 111.2 and 116.8 m/s. In this context, a soft projectile is considered to be much more deformable than the structure that it impacts against, resembling the fuselage of an aircraft. In addition to experimental data generation, the aim of the tests was to study how the vibration propagates from the hit point, how it gets damped and how these properties change when the structure is already damaged. Propagation of vibration was measured in the tests with six displacement sensors and accelerometers, spaced along the propagation path of vibration. In addition, strains in the reinforcement were measured at ten locations. The change in response of the structure between the consecutive impacts depended on the type of quantity measured: the displacements increased somewhat from a test to the next one while the accelerations decreased in a similar manner. At the same time no clear behaviour could be identified for the reinforcement strains. In each case, the main frequencies at which the response occurred decreased slightly from a test to the next one with the frequencies being slightly lower than the ones identified in the modal analyses carried out under same conditions.

KW - aircraft crash

KW - soft impact

KW - impact testing

KW - vibration

KW - damping

M3 - Conference article

ER -

Vepsä A, Aatola S, Calonius K, Halonen M. Impact testing of a wall-floor-wall reinforced concrete structure. 2015. Paper presented at 22nd International Conference on Structural Mechanics in Reactor Technology 2013, SMiRT 22, San Francisco, United States.