Computer Vision System for Monitoring in Dynamic Structural Testing

Lunghi, Francesco; Pavese, Alberto; Peloso, Simone; Lanese, Igor; Silvestri, Davide

doi:10.1007/978-94-007-1977-4_9

Cited by 11 publications

(11 citation statements)

References 6 publications

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“…An optical measurement system was employed to record the displacement response of the structure during shaking. This system [18] uses high-definition cameras to record the 2D displacement of reflecting markers that are glued to the structure and was used to record the in-plane displacements of the URM walls and RC slabs of the west façade of the structure. Figure 2 shows the retaining structures that were installed on the outer and inner sides of the out-ofplane loaded URM walls.…”

Section: Test Unitmentioning

confidence: 99%

Influence of boundary conditions on the out‐of‐plane response of brick masonry walls in buildings with RC slabs

Tondelli

Beyer

DeJong

2016

Earthq Engng Struct Dyn

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SUMMARYIn modern unreinforced masonry buildings with stiff RC slabs, walls of the top floor are most susceptible to out-of-plane failure. The out-of-plane response depends not only on the acceleration demand and wall geometry but also on the static and kinematic boundary conditions of the walls. This paper discusses the influence of these boundary conditions on the out-of-plane response through evaluation of shake table test results and numerical modelling. As a novum, it shows that the in-plane response of flanking elements, which are orthogonal to the wall whose out-of-plane response is studied, has a significant influence on the vertical restraint at the top of the walls. The most critical configuration exists if the flanking elements are unreinforced masonry walls that rock. In this case, the floor slabs can uplift, and the out-of-plane loadbearing walls loose the vertical restraint at the top. Numerical modelling confirms this experimentally observed behaviour and shows that slab uplift and the difference in base and top excitation have a strong influence on the out-of-plane response of the walls analysed.

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Section: Test Unitmentioning

confidence: 99%

Influence of boundary conditions on the out‐of‐plane response of brick masonry walls in buildings with RC slabs

Tondelli

Beyer

DeJong

2016

Earthq Engng Struct Dyn

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“…The axial force in the central URM walls remained approximately constant, though small variations might have been caused by the different types of horizontal elements framing from the left and right into these URM walls (RC slab only vs. RC slab plus masonry spandrel). Since the deformation capacity of URM walls decreases with increasing axial load (Lang 2002;Petry and Beyer 2014b), the outer URM walls failed for loading in the negative direction, which is indicated by the compression failure at the toe of wall WN1 and the shear crack reaching from the outer bottom corner to the inner top corner of wall EN1 (Fig. 9).…”

Section: Failure Modementioning

confidence: 99%

“…This is a 2D measurement system, i.e., only displacements in the Bull Earthquake Eng direction of motion and vertical displacements were recorded. This system was developed by the TREES-laboratory (Lunghi et al 2012) and uses high definition cameras to compute the position of reflecting markers (Fig. 41).…”

Section: Optical Measurement Systemmentioning

confidence: 99%

“…Note that the markers belonging to two subsets therefore have two names. The coordinate histories of each marker are computed in a global coordinate system whose origin is located at the initial position of the bottom, left corner of the structure (Lunghi et al 2012). The x-axis is the horizontal axis and points towards the north, and the y-axis is the vertical axis and points upwards (Fig.…”

Section: Optical Measurement Systemmentioning

confidence: 99%

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Dynamic testing of a four-storey building with reinforced concrete and unreinforced masonry walls: prediction, test results and data set

Beyer

Tondelli

Petry

et al. 2015

Bull Earthquake Eng

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This paper presents the results of a series of shake-table tests on a half-scale, four-storey building with reinforced concrete and unreinforced masonry walls. Due to the lack of reference tests, the seismic behaviour of such mixed structures is poorly understood. The test unit was subjected to several runs of increasing intensity yielding performance states between minor damage and near collapse. Before the test, the expected peak table accelerations leading to different limit states were estimated using the capacity spectrum method, and the predicted values corresponded rather well to actual sustained accelerations. Next to these analyses, the paper describes the test unit, instrumentation and input motion, and comments on the response of the mixed structure in terms of damage evolution and global response quantities, such as force-displacement response and drift and acceleration profiles. The raw and post-processed data sets are made publically available, and all relevant information with regard to data organisation and post-processing procedure is described in an appendix to this paper. The test serves therefore as a benchmark for the validation of numerical models of such mixed structures. The project aims at providing a foundation for the development of seismic design and assessment methods of mixed structures, which are currently not covered by structural codes, including Eurocode 8.

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“…In such a direction, an interesting prospective is provided by the recent developments of displacement sensors based on opto-electronic technologies applied to laser or digital vision systems. Such kind of systems are increasingly utilized as motion measurement devices also for shaking table tests [3,4].…”

Section: Introductionmentioning

confidence: 99%

Processing of 3d Optical Motion Data of Shaking Table Tests: Filtering Optimization and Modal Analysis

Roselli¹,

Paolini²,

Mongelli³

et al. 2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Computer Vision System for Monitoring in Dynamic Structural Testing

Cited by 11 publications

References 6 publications

Influence of boundary conditions on the out‐of‐plane response of brick masonry walls in buildings with RC slabs

Influence of boundary conditions on the out‐of‐plane response of brick masonry walls in buildings with RC slabs

Dynamic testing of a four-storey building with reinforced concrete and unreinforced masonry walls: prediction, test results and data set

Processing of 3d Optical Motion Data of Shaking Table Tests: Filtering Optimization and Modal Analysis

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