000013326 001__ 13326
000013326 005__ 20161114160336.0
000013326 04107 $$aeng
000013326 046__ $$k2009-06-22
000013326 100__ $$aArangio, S.
000013326 24500 $$aResponse of buildings to ground movements: considerations about the numerical modeling

000013326 24630 $$n2.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000013326 260__ $$bNational Technical University of Athens, 2009
000013326 506__ $$arestricted
000013326 520__ $$2eng$$aIn this paper different finite element models to evaluate the response of buildings to tunneling-induced ground movements are discussed and compared. The soil-structure interaction is a complex problem that can be treated at different levels of accuracy: the simplest approach consists in evaluating the effects on the building by applying the settlements in greenfield condition in form of assigned displacements. This approach is usually conservative because does not consider the effect of building stiffness. An intermediate approach evaluates the settlements by modeling the building as an equivalent beam, having the same stiffness properties of the entire structure; in this way the obtained curve considers the soil-structure interaction in an approximate way. The high level accuracy approach includes three-dimensional models and linear and nonlinear analyses. The analyses show that, even tough the influence of the building depends on its characteristics and position on the settlement curve (sagging or hogging), in almost all the cases it reduces the curve obtained in greenfield condition. Moreover, with detailed three-dimensional models it is possible to evaluate the importance of various factors such as the type of foundation, raft or discontinuous, and the structural system, masonry walls or reinforced concrete frames. At this regard it has been noted that raft foundations tend to decrease the differential displacements, whereas, in case of discontinuous foundations, there is a punctual reduction of settlement under the columns. The tunneling-induced stresses on the building are evaluated as well. It comes out that discontinuous foundations lead to irregular stress flows and larger stress value. The stress in the cases of masonry walls and reinforced concrete frames are similar but in the first one the stress values are higher. Moreover, nonlinear analyses are able to catch tensile strain in the facades, which can be a fundamental parameter in determining the onset of cracking. Therefore, for a complete evaluation, different level of modeling should be used, according with the needed degree of accuracy of the results.

000013326 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013326 653__ $$atunneling-induced settlement, soil-structure interaction, building response, numerical modeling, nonlinear analysis Abstract. In this paper different finite element models to evaluate the response of buildings to tunneling-induced ground movements are discussed and compared. The soil-structure interaction is a complex problem that can be treated at different levels of accuracy: the simplest approach consists in evaluating the effects on the building by applying the settlements in greenfield condition in form of assigned displacements. This approach is usually conservative because does not consider the effect of building stiffness. An intermediate approach evaluates the settlements by modeling the building as an equivalent beam, having the same stiffness properties of the entire structure; in this way the obtained curve considers the soil-structure interaction in an approximate way. The high level accuracy approach includes three-dimensional models and linear and nonlinear analyses. The analyses show that, even tough the influence of the building depends on its characteristics and position on the settlement curve (sagging or hogging), in almost all the cases it reduces the curve obtained in greenfield condition. Moreover, with detailed three-dimensional models it is possible to evaluate the importance of various factors such as the type of foundation, raft or discontinuous, and the structural system, masonry walls or reinforced concrete frames. At this regard it has been noted that raft foundations tend to decrease the differential displacements, whereas, in case of discontinuous foundations, there is a punctual reduction of settlement under the columns. The tunneling-induced stresses on the building are evaluated as well. It comes out that discontinuous foundations lead to irregular stress flows and larger stress value. The stress in the cases of masonry walls and reinforced concrete frames are similar but in the first one the stress values are higher. Moreover, nonlinear analyses are able to catch tensile strain in the facades, which can be a fundamental parameter in determining the onset of cracking. Therefore, for a complete evaluation, different level of modeling should be used, according with the needed degree of accuracy of the results.

000013326 7112_ $$aCOMPDYN 2009 - 2nd International Thematic Conference$$cIsland of Rhodes (GR)$$d2009-06-22 / 2009-06-24$$gCOMPDYN2009
000013326 720__ $$aArangio, S.$$iPanetta, G.
000013326 8560_ $$ffischerc@itam.cas.cz
000013326 8564_ $$s5091093$$uhttps://invenio.itam.cas.cz/record/13326/files/CD478.pdf$$yOriginal version of the author's contribution as presented on CD, section: Soil-structure interaction.
000013326 962__ $$r13074
000013326 980__ $$aPAPER