Bridge–Pier Caisson foundations subjected to normal and thrust faulting: physical experiments versus numerical analysis

Gazetas, George; Zarzouras, Orestis; Drosos, Vasileios; Anastasopoulos, Ioannis

doi:10.1007/s11012-014-9997-7

Cited by 24 publications

(3 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The considered seismic scenario is that of a soft sedimentary soil (with various shear velocity) where shear waves are dominant (both surface and bulk waves) and the earthquake source is located in the far field. No faulting or permanent deformations are considered [45,46]. The study starts with a detailed analysis of the metamaterial unit cell containing the resonator.…”

Section: Introductionmentioning

confidence: 99%

Mitigation of seismic waves: metabarriers and metafoundations bench tested

Colombi,

Zaccherini,

Palermo

2019

Preprint

View full text Add to dashboard Cite

The article analyses two potential metamaterial designs, the metafoundation and the metabarrier, capable to attenuate seismic waves on buildings or structural components in a frequency band between 3.5 to 8 Hz. The metafoundation serves the dual purpose of reducing the seismic response and supporting the superstructure. Conversely the metabarrier surrounds and shields the structure from incoming waves. The two solutions are based on a cell layout of local resonators whose dynamic properties are tuned using finite element simulations combined with Bloch-Floquet boundary conditions. To enlarge the attenuation band, a graded design where the resonant frequency of each cell varies spatially is employed. If appropriately enlarged or reduced, the metamaterial designs could be used to attenuate lower frequency seismic waves or groundborne vibrations respectively. A sensitivity analysis over various design parameters including size, number of resonators, soil type and source directivity, carried out by computing full 3D numerical simulations in time domain for horizontal shear waves is proposed. Overall, the metamaterial solutions discussed here can reduce the spectral amplification of the superstructure between approx. 15 to 70% depending on several parameters including the metastructure size and the properties of the soil. Pitfalls and advantages of each configuration are discussed in detail. The role of damping, crucial to avoid multiple resonant coupling, and the analogies between graded metamaterials and tuned mass dampers is also investigated.

show abstract

Section: Introductionmentioning

confidence: 99%

Mitigation of seismic waves: metabarriers and metafoundations bench tested

Colombi,

Zaccherini,

Palermo

2019

Preprint

View full text Add to dashboard Cite

show abstract

“…The applications of laser scanning for SLT is rather a rarity and was not widely described in the literature. Some experiences were described in References [ 19 , 20 ] but in those cases, scanning was applied to the description of ground surface geometry around cyclically loaded piles which affect the final evaluation of the pile’s capacity. Application of terrestrial laser scanning for estimation of s the tress distribution model for elastic beam structures (multi-dimensional double-layer lattices) can be found in Reference [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

Accuracy Assessment of Semi-Automatic Measuring Techniques Applied to Displacement Control in Self-Balanced Pile Capacity Testing Appliance

Muszyński

Rybak

Kaczor

2018

Sensors

View full text Add to dashboard Cite

Static load tests of foundation piles are the basic method for the designing or verification of adopted design solutions which concern the foundation of a building structure. Preparation of a typical test station using the so-called inverted beam method is very expensive and labor-intensive. The settlement values of the loaded pile are usually recorded using accurate dial gauges. These gauges are attached to a reference beam located in close proximity to the pile under test, which may cause systematic errors (difficult to detect) caused by the displacement of the adopted reference beam. The application of geodetic methods makes it possible to maintain an independent, external reference system, and to verify the readouts from dial gauges. The article presents an innovative instrumentation for a self-balanced stand for the static load test made from a closed-end, double steel pipe. Instead of typical, precise geometric leveling, the semi-automatic measuring techniques were used: motorized total station measurement and terrestrial laser scanning controlled by a computer. The processing of the acquired data made it possible to determine the vertical displacements of both parts of the examined pile and compare displacements with the results from the dial gauges. On the basis of the excess of the collected observations, it was possible to assess the accuracy, which confirmed the usefulness of measuring techniques under study.

show abstract

“…It is also well-documented that, during strong motion excitations, various building typologies and structural elements have avoided damage or suffered multi-level damage [7,8]. Moreover, soil-structure interaction is an important issue in seismic hazard assessment studies predominantly for historical buildings and particularly in monuments where the effect of soil conditions on their seismic response should be examined through soil-structure interaction studies [9].…”

Section: Introductionmentioning

confidence: 99%

Assessing the Main Frequencies of Modern and Historical Buildings Using Ambient Noise Recordings: Case Studies in the Historical Cities of Crete (Greece)

2018

View full text Add to dashboard Cite

Abstract:Monitoring seismic structural response is an essential issue in earthquake risk assessments and mitigation studies for monumental buildings in order to undertake earthquake disaster management. This study aims at identifying the resonant frequency of soil and modern and historical buildings in three major municipalities of Crete (Heraklion, Chania, and Rethymno) using ambient noise recordings (microtremors) considering the importance of soil-structure interaction to seismic structural response, particularly for historical buildings and monumental structures. In this study, ambient noise recordings have been processed through Horizontal to Vertical Spectral Ratios (H/V) to preliminarily examine the main frequencies and to examine whether the building has its main frequency close to that of the soil in order to identify potential resonance phenomena. Numerous ambient noise recordings were recorded on the soil, in the basement, and at each n-floor of the buildings. The incorporation of local site conditions and soil-building resonance phenomena into the urban planning development of Crete regarding earthquake risk assessments is necessary. In this direction, microtremors can be used as an effective tool to support civil protection preparation and operational decision-making in terms of earthquake disaster, specifically in the area of Crete, which is characterized by high seismic activity and a high cultural monuments capacity.

show abstract

Bridge–Pier Caisson foundations subjected to normal and thrust faulting: physical experiments versus numerical analysis

Cited by 24 publications

References 29 publications

Mitigation of seismic waves: metabarriers and metafoundations bench tested

Mitigation of seismic waves: metabarriers and metafoundations bench tested

Accuracy Assessment of Semi-Automatic Measuring Techniques Applied to Displacement Control in Self-Balanced Pile Capacity Testing Appliance

Assessing the Main Frequencies of Modern and Historical Buildings Using Ambient Noise Recordings: Case Studies in the Historical Cities of Crete (Greece)

Contact Info

Product

Resources

About