Advanced Composite Panels for Seismic and Vibration Mitigation of Existing Structures

[+] Author and Article Information
Amjad J. Aref

Department of Civil, Structural & Environmental Engineering, University at Buffalo-State University of New York, 235 Ketter Hall, Buffalo, NY 14260aaref@eng.buffalo.edu

Woo-Young Jung

Department of Civil Engineering, Kangnung National University, Kangnung, 210-702, Republic of Korea

J. Eng. Mater. Technol 128(4), 618-632 (Jun 28, 2006) (15 pages) doi:10.1115/1.2345455 History: Received July 29, 2005; Revised June 28, 2006

In this paper, a conceptual design, fabrication, and testing of advanced polymer matrix composite (PMC) infill system are addressed for seismic retrofitting of steel frames. Such a system is designed to have a multi-panel PMC infill system with passive energy mechanism. The basic configuration of this system is composed of two separate components—namely, an inner PMC sandwich panel and outer damping panels. The inner PMC sandwich infill consists of two fiber-reinforced polymer (FRP) laminates with Divincell® H core, and outer damping panels are made of FRP laminate plates and passive energy constrained damping layers—combining polymer honeycomb and 3M viscoelastic solid materials—at the interface between the laminates. The interactions of these two components produce considerable stiffness and enhanced damping properties in the structure following different drift level. Conceptually, the FRP outer damping panels are designed to produce the damping through the cyclic shear straining of the combined interface damping layers. Moreover, as the lateral drift increases, the inner PMC sandwich infill is designed to provide considerable lateral stiffness to resist severe earthquake excitation and avoid excessive relative floor displacements that cause both structural and non-structural damage. As part of this research, analytical and experimental studies were performed to investigate the effectiveness of the proposed multi-infill panel concept. The prefabricated multi-panel PMC infill holds a great promise for enhanced damping performance, simplification of the construction process, and the reduction of time and cost when used for seismic retrofitting applications.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Configuration of a multi-panel PMC infill system

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Figure 2

Numerical results for maximum buckle force of applied designing stacking sequences

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Figure 3

Numerical results for different gap condition: (a) Force-displacement response; (b) relation between different gap distance and contact displacement

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Figure 4

The detail dimension of PMC sandwich panel (unit=in., 1in.=25.4mm)

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Figure 5

Geometric configuration of the damping panel

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Figure 6

Deformed geometry of the damping panel during inter-story drift, Gasparini (9)

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Figure 7

The detail dimension of an outer damping panel (unit=cm): (a) FRP laminates; (b) constrained combining interface layer

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Figure 8

Configuration of test coupon

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Figure 9

Effectiveness of the combined damping layer (10% strain): (a) Hysteretic energy response at 1.0Hz frequency; (b) energy dissipation capacity under various frequencies

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Figure 10

Comparison of hysteretic energy of the viscoelastic material (30% strain)

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Figure 11

Effective damping ratio of the multi-panel PMC infilled frame

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Figure 12

Joint Connections: (a) Bolted angle connections; (b) beam-to-panel connectors

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Figure 13

Measurement of shear deformation at the combined interface layer

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Figure 14

Setup of the multi-panel PMC infilled frame structure

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Figure 15

Test results of the steel frame with the PMC sandwich infill: (a) force-displacement response (2.0% drift); (b) inter-story to rotation response of the joint connections

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Figure 16

Strut angle distribution of the PMC infill panel along global coordinate direction

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Figure 17

Test results of the specimens under monotonic loading test: (a) Variation of in-plane stiffness of the tested specimens (0.5% drift); (b) shear deformation of the interface layers

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Figure 18

Comparison of top joint rotation response before and after the PMC sandwich infill contacts

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Figure 19

Comparison of moment distribution of the steel frame members (1.0% drift): (a) Right column; (b) top beam

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Figure 20

Hysteretic response of the multi-panel PMC infilled frame structure: (a) Before and after making contact with the PMC sandwich infill; (b) enhanced hysteretic effect induced by the combined interface layers (0.16%, f=0.5Hz)

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Figure 21

Energy dissipation capacity of the multi-panel PMC infill system under various frequencies

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Figure 22

Analytical and experimental shear deformation of the interface damping layer under successively increased lateral drifts

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Figure 23

Destructive test of the multi-panel PMC infilled frame under push-over loading (up to 3.0% drift)

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Figure 24

FE model of the steel frame infilled with the PMC sandwich panel

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Figure 25

Comparison of force-displacement response of the structures: (a) Steel frame; (b) steel frame infilled with the PMC sandwich panel

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Figure 26

Compressive strut angle for numerical and experimental results

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Figure 27

Simplified FE model of the steel frame with the outer damping panels: (a) Bolted semi-rigid connection; (b) FE model for equal number of damping layers

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Figure 28

Numerical simulation of rate-dependent effect of viscoelastic material (1.0% drift): (a) Comparison with experimental result, (b) hysteretic energy at 3.0Hz




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