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A platform for research: civil engineering, architecture and urbanism
Erdbebenberechnungen von unterirdisch angeordneten Reaktorgebäuden
Embedding the buildings, in soil changes their seismic response behaviour as compared to surface buildings, i. e. higher, stiffness and increased radiation damping is attained. Finite element models are, best suited for determining the effects of embedment and of layered subsoil. The code used was the LUSH2-programme, which is applicable to 2-dimensional problems and provides an approximate treatment for non-linear dynamic soil behaviour. For embedded buildings there is a good agreement between 2- and 3-dimensiqnal models of the response for points below the soil surface. It is therefore permissible to use the less costly 2-dimensionalprogrammes. To simulate earthquake, three different acceleration-time histories, derived from actual measurements and from artificial synthesis, with differing response spectra were fed in. The soil characteristics assumed are applicable to a representative site in Germany. Three different types of models were examined, using analytical models with only a few elements for parametric studies and with up to 716 elements for more precise calculations. A comparison was made between the semi-embedment, the total embedment, and installation of the reactor building above-ground. The results of the calculations show that the three, acceleration- time histories lead to different peak stresses due to different spectral intensities, but that the acceleration patterns as a function of depth are similar. It does not even change significantly with variations in the dynamic shear modulus and critical damping of the soil layers. The acceleration pattern is strongly influenced by the thickness of the soil layer between the rigid base and the foundation plate of the building. In the case of thick strata, accelerations will decrease towards the soil surface, whereas they increase with less thick strata(amplification). This phenomenon is independent of the level of embedment of the reactor building. To answer the question as to which siting will involve lower accelerations a distinction must be made ...
Erdbebenberechnungen von unterirdisch angeordneten Reaktorgebäuden
Embedding the buildings, in soil changes their seismic response behaviour as compared to surface buildings, i. e. higher, stiffness and increased radiation damping is attained. Finite element models are, best suited for determining the effects of embedment and of layered subsoil. The code used was the LUSH2-programme, which is applicable to 2-dimensional problems and provides an approximate treatment for non-linear dynamic soil behaviour. For embedded buildings there is a good agreement between 2- and 3-dimensiqnal models of the response for points below the soil surface. It is therefore permissible to use the less costly 2-dimensionalprogrammes. To simulate earthquake, three different acceleration-time histories, derived from actual measurements and from artificial synthesis, with differing response spectra were fed in. The soil characteristics assumed are applicable to a representative site in Germany. Three different types of models were examined, using analytical models with only a few elements for parametric studies and with up to 716 elements for more precise calculations. A comparison was made between the semi-embedment, the total embedment, and installation of the reactor building above-ground. The results of the calculations show that the three, acceleration- time histories lead to different peak stresses due to different spectral intensities, but that the acceleration patterns as a function of depth are similar. It does not even change significantly with variations in the dynamic shear modulus and critical damping of the soil layers. The acceleration pattern is strongly influenced by the thickness of the soil layer between the rigid base and the foundation plate of the building. In the case of thick strata, accelerations will decrease towards the soil surface, whereas they increase with less thick strata(amplification). This phenomenon is independent of the level of embedment of the reactor building. To answer the question as to which siting will involve lower accelerations a distinction must be made ...
Erdbebenberechnungen von unterirdisch angeordneten Reaktorgebäuden
Altes, J. (author) / Kaschmieder, D. (author)
1977-01-01
Jülich : Kernforschungsanlage Jülich, Verlag, Berichte der Kernforschungsanlage Jülich 1445, 42 p. (1977).
Paper
Electronic Resource
German
DDC:
690
Erdbebenberechnungen von unterirdisch angeordneten Reaktorgebäuden
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