When seismic thrust faults emerge on the ground surface, they are particularly damaging to buildings, bridges and lifelines that lie on the rupture path. To protect a structure founded on a rigid raft, a thick diaphra...When seismic thrust faults emerge on the ground surface, they are particularly damaging to buildings, bridges and lifelines that lie on the rupture path. To protect a structure founded on a rigid raft, a thick diaphragm-type soil bentonite wall （SBW） is installed in front of and near the foundation, at sufficient depth to intercept the propagating fault rupture. Extensive numerical analyses, verified against reduced-scale （1 g） split box physical model tests, reveal that such a wall, thanks to its high deformability and low shear resistance, ＂absorbs＂ the compressive thrust of the fault and forces the rupture to deviate upwards along its length. As a consequence, the foundation is left essentially intact. The effectiveness of SBW is demonstrated to depend on the exact location of the emerging fault and the magnitude of the fault offset. When the latter is large, the unprotected foundation experiences intolerable rigid-body rotation even if the foundation structural distress is not substantial.展开更多
Seismic oscillations of the “building-building” system which is interconnected buildings built close to each other, and “building-stack-like structure” system which is adjacent and connected in different ways to e...Seismic oscillations of the “building-building” system which is interconnected buildings built close to each other, and “building-stack-like structure” system which is adjacent and connected in different ways to existing building are considered in the paper. Different types of connections, such as dampers, including the ones suggested by the authors, are studied. Seismic impact is given as a harmonic function and various existing accelerograms, including synthesized ones. Distinctive feature of this paper from previously published ones [1] [2] is the fact that the emphasis falls on the influence of soil-foundation interaction properties, which are described using various models of load-displacement connections. Calculation results are compared in the case of representation of the building as concentrated masses and spatial systems. Ways to reduce seismic response of buildings during the earthquakes are pointed out. Results of experimental studies are given in the paper and are compared with calculations.展开更多
A closed-form solution is presented for rocking compliance of rigid rectangular foundations on an elastic half-space under a harmonic force.Rocking motion in the vicinity of the foundation is also investigated.Numeric...A closed-form solution is presented for rocking compliance of rigid rectangular foundations on an elastic half-space under a harmonic force.Rocking motion in the vicinity of the foundation is also investigated.Numerical examples are shown and comparisons between the results of the proposed approach and other methods are made.The efficient computing method of rocking compliance can facilitate seismic response analysis of long dams and other large flexible bodies.展开更多
The dynamic and earthquake response of bell towers,located at the Island of Kefalonia,Greece,is examined here.These structures were subjected during the winter of 2014 with an intensive earthquake sequence.The dynamic...The dynamic and earthquake response of bell towers,located at the Island of Kefalonia,Greece,is examined here.These structures were subjected during the winter of 2014 with an intensive earthquake sequence.The dynamic characteristics of two bell towers were measured in situ.Subsequently the dynamic and earthquake response of each bell tower was numerically simulated employing 3-D dynamic elastic numerical simulations taking into account the soil-foundation deformability.It is demonstrated that the soil-foundation-structure interaction influences the dynamic and earthquake response predictions for this structure quite significantly.It also demonstrates the usefulness of such in-situ testing towards formulating realistic numerical models in order to yield realistic predictions of the dynamic and earthquake response of the examined structures.The obtained numerical analyses utilize the earthquake ground motion which was recorded at close distance from both bell towers.The numerical predictions of the earthquake response of both bell towers are utilized to draw conclusions of their actual earthquake performance.It is concluded that the soil-foundation interaction was a critical response mechanism.The newly built RC(reinforced concrete)bell towers performed satisfactorily.展开更多
基金the technical and financial support of IIEES under the research project "Evaluation of possible measures to construct in vicinity of active fault"the financial support under the research project "DARE", by the European Research Council’s (ERC) "IDEAS" Programme, in Support of Frontier Research under contract/number ERC–2–9–AdG228254–DARE
文摘When seismic thrust faults emerge on the ground surface, they are particularly damaging to buildings, bridges and lifelines that lie on the rupture path. To protect a structure founded on a rigid raft, a thick diaphragm-type soil bentonite wall （SBW） is installed in front of and near the foundation, at sufficient depth to intercept the propagating fault rupture. Extensive numerical analyses, verified against reduced-scale （1 g） split box physical model tests, reveal that such a wall, thanks to its high deformability and low shear resistance, ＂absorbs＂ the compressive thrust of the fault and forces the rupture to deviate upwards along its length. As a consequence, the foundation is left essentially intact. The effectiveness of SBW is demonstrated to depend on the exact location of the emerging fault and the magnitude of the fault offset. When the latter is large, the unprotected foundation experiences intolerable rigid-body rotation even if the foundation structural distress is not substantial.
文摘Seismic oscillations of the “building-building” system which is interconnected buildings built close to each other, and “building-stack-like structure” system which is adjacent and connected in different ways to existing building are considered in the paper. Different types of connections, such as dampers, including the ones suggested by the authors, are studied. Seismic impact is given as a harmonic function and various existing accelerograms, including synthesized ones. Distinctive feature of this paper from previously published ones [1] [2] is the fact that the emphasis falls on the influence of soil-foundation interaction properties, which are described using various models of load-displacement connections. Calculation results are compared in the case of representation of the building as concentrated masses and spatial systems. Ways to reduce seismic response of buildings during the earthquakes are pointed out. Results of experimental studies are given in the paper and are compared with calculations.
文摘A closed-form solution is presented for rocking compliance of rigid rectangular foundations on an elastic half-space under a harmonic force.Rocking motion in the vicinity of the foundation is also investigated.Numerical examples are shown and comparisons between the results of the proposed approach and other methods are made.The efficient computing method of rocking compliance can facilitate seismic response analysis of long dams and other large flexible bodies.
文摘The dynamic and earthquake response of bell towers,located at the Island of Kefalonia,Greece,is examined here.These structures were subjected during the winter of 2014 with an intensive earthquake sequence.The dynamic characteristics of two bell towers were measured in situ.Subsequently the dynamic and earthquake response of each bell tower was numerically simulated employing 3-D dynamic elastic numerical simulations taking into account the soil-foundation deformability.It is demonstrated that the soil-foundation-structure interaction influences the dynamic and earthquake response predictions for this structure quite significantly.It also demonstrates the usefulness of such in-situ testing towards formulating realistic numerical models in order to yield realistic predictions of the dynamic and earthquake response of the examined structures.The obtained numerical analyses utilize the earthquake ground motion which was recorded at close distance from both bell towers.The numerical predictions of the earthquake response of both bell towers are utilized to draw conclusions of their actual earthquake performance.It is concluded that the soil-foundation interaction was a critical response mechanism.The newly built RC(reinforced concrete)bell towers performed satisfactorily.
