Efficient solution of the multiple seismic pounding problem using hierarchical substructure techniques

Bamer, Franz; Shi, Jianye; Markert, Bernd

doi:10.1007/s00466-017-1525-x

Cited by 15 publications

(13 citation statements)

References 38 publications

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“…The mitigation of pounding induced by earthquake between steel structures through the interposition of shock absorbers between the colliding members are the focus of the papers. 15,16,[25][26][27][28][29][30] The constitutive relations between impacting systems can be modeled in different ways. A summary subdivision can be made in two general groups: hard and soft impacts.…”

Section: Impact By Bumpersmentioning

confidence: 99%

“…The former is based on the concept of restitution coefficient, [24][25][26] where the contact time is assumed to be infinitely small and the deformation in the contact zone to be negligible, whereas the latter presumes contact time of finite duration, and a penetration between colliding bodies is admitted. Therefore, linear, 29 Hertzian, 31,32 or alternative nonlinear springs and viscous dampers 15,16,27,28,30 are used to model the contact.…”

Section: Impact By Bumpersmentioning

confidence: 99%

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Influence of the characteristics of isolation and mitigation devices on the response of single‐degree‐of‐freedom vibro‐impact systems with two‐sided bumpers and gaps via shaking table tests

Andreaus

Angelis

2020

Struct Control Health Monit

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Summary During strong earthquakes, structural pounding may occur between structures (buildings, bridges, strategic facilities, critical equipment, etc.) and the surrounding moat wall because of the limited separation distance and the deformations of the isolator. An arrangement that favors the solution of this problem is the interposition of shock absorbers. Thus, the influence of geometrical and mechanical characteristics of isolation and mitigation devices on nonlinear, nonsmooth response of vibro‐impact systems is experimentally investigated in this paper on the basis of a laboratory campaign of experimental tests. Shaking table tests were carried out under a harmonic excitation in order to investigate two different configurations: the absence and the presence of bumpers. Three different values of the table acceleration peak were applied, four different amplitude values of the total gap between mass and bumpers were considered, and also four different types of bumpers were employed; moreover, two problems were addressed, namely, control of excessive displacements and control of excessive accelerations, and hence, two types of normalization were adopted in order to better interpret experimental results. Suitable choices of pairs of bumpers and gaps were suggested as a trade‐off between conflicting objectives. Furthermore, a numerical model was proposed, and its governing parameters identified in order to simulate the experimental results.

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Section: Impact By Bumpersmentioning

confidence: 99%

Section: Impact By Bumpersmentioning

confidence: 99%

Influence of the characteristics of isolation and mitigation devices on the response of single‐degree‐of‐freedom vibro‐impact systems with two‐sided bumpers and gaps via shaking table tests

Andreaus

Angelis

2020

Struct Control Health Monit

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“…Furthermore, the bridge is surrounded by a solid foundation in order to initialize the vehicle on the road and have a straight access to the bridge. The contact between the vehicle and the road is modeled frictionless using a node-to-surface contact formulation and the penalty method [4]. While the vehicle is passing the bridge with different velocities, the vertical acceleration is measured at the suspension.…”

Section: Modeling Of the Vehicle Bridge Interactionmentioning

confidence: 99%

A damage detection study of a bridge using bypassing vehicles and computational intelligence

Hesser

Bamer

Markert

2019

Proc Appl Math and Mech

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Structural integrity is an ubiquitous topic in research and daily living. Conventional monitoring strategies follow a preventive maintenance plan or require permanent installation of sensors. These steps are time and cost-inefficient taking into account the high number of bridges to be monitored. In this study, a bridge structure is passively monitored using the acceleration signal of a bypassing vehicle. Thereby, the signal is measured on the vehicle. The health status of the bridge can be evaluated after each pass, which allows a continuous monitoring of the structure. A numerical model of a bridge and a bypassing car is carried out to prove the feasibility of this approach and to create a large database with different damage locations and vehicle velocities. Moreover, an artificial neural network is trained on that database to detect damaged bridge structures. The proposed method proves the feasibility of monitoring the structural integrity of bridges and supports conventional maintenance methods. Therefore, the combination of active and passive monitoring strategies paves the way to efficient and cheap infrastructure monitoring strategies.

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“…Furthermore, we choose academic parameter for the new pounding element: k = 10 7 [N/m 3/2 ], R = 250 [N], ζ = 0.2 [−]. The nonlinear set of equations of motion is solved applying the explicit central difference scheme, using an integration time step of 0.0005 [s].…”

Section: Numerical Examplementioning

confidence: 99%

A nonlinear visco‐elastoplastic model for structural pounding

Bamer

Markert

2018

Earthq Engng Struct Dyn

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Summary State‐of‐the‐art pounding formulations do not consider eventual damage‐induced changes regarding the collision description during an excitation time history. In particular, in case of multiple collisions, the pounding models remain unaltered. Thus, in this paper, a new pounding formulation is presented, whereby the state‐of‐the‐art nonlinear viscoelastic model is enhanced by a dry friction element. This extension enables the description of degradation of collision surfaces by introducing an additional offset penetration parameter to the standard gap function. The phenomenological model of the new pounding formulation and the new corresponding pounding condition is presented and demonstrated on an illustrative numerical example. It is shown that the new formulation is capable of describing permanent damage effects caused by pounding collisions while preserving the desired physical properties of the nonlinear viscoelastic model.

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Efficient solution of the multiple seismic pounding problem using hierarchical substructure techniques

Cited by 15 publications

References 38 publications

Influence of the characteristics of isolation and mitigation devices on the response of single‐degree‐of‐freedom vibro‐impact systems with two‐sided bumpers and gaps via shaking table tests

Influence of the characteristics of isolation and mitigation devices on the response of single‐degree‐of‐freedom vibro‐impact systems with two‐sided bumpers and gaps via shaking table tests

A damage detection study of a bridge using bypassing vehicles and computational intelligence

A nonlinear visco‐elastoplastic model for structural pounding

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