Effects of Connection Fractures on Global Behavior of Steel Moment Frames Subjected to Earthquakes

Rodgers, Janise E.; Mahin, Stephen A.

doi:10.1061/(asce)0733-9445(2006)132:1(78)

Cited by 28 publications

(15 citation statements)

References 10 publications

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“…The global response of the specimen to connection fracture is discussed elsewhere [11,13], but two general trends important for understanding the transient local response are mentioned here. First, the global displacement response of the specimen is smooth during and immediately following fracture, as shown in Figure 5.…”

Section: Experimental Protocolmentioning

confidence: 99%

“…No triggered fractures were observed, but the test of specimen F shows the possibility exists. Such triggered fractures would have the potential to significantly impact the global frame response in some cases, as it has been demonstrated that interstory drifts increase for near-field ground motions as the number of fractures increases, particularly in beam top flanges [8,13]. Assuming a linear strain profile across the beam section (since the beam remains elastic and the gages are sufficiently far from the ends) permits the separation of the section strain diagram into longitudinal (axial) and bending components.…”

Section: Wave Velocity Strain Gages Placed Along the Beams As Shown Inmentioning

confidence: 99%

“…The local fracture-induced phenomena were investigated as a part of a larger experimental and analytical program focused on the effects of connection fracture and deterioration on welded steel moment frame (WSMF) system behavior [12,13]. Several of the experiments were performed with the specific objective of capturing high-resolution data on the dynamic response immediately following fracture.…”

Section: Introductionmentioning

confidence: 99%

“…Four fracture-induced phenomena are described in this paper: change in the deflected shape of the beam, local redistribution of moments, the presence and interaction of stress waves propagating away from the fracture, and excitation of local modes of vibration in the beam. Additional information on global response to deterioration and the experimental and analytical techniques employed can be found elsewhere [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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Local fracture‐induced phenomena in steel moment frames

Rodgers¹,

Mahin

2008

Earthq Engng Struct Dyn

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SUMMARYBrittle fractures were observed at the welded beam-to-column connections of a number of steel moment frame buildings following the M6.7 1994 Northridge earthquake. Such fractures cause a rapid loss of connection strength and stiffness, as well as a sudden release of the strain energy stored by the connection at the time of fracture. Immediately following the fracture, a number of highly transient phenomena occur locally in the members adjacent to the connection, as well as globally in the structure as a whole. Four significant local phenomena were observed locally during shaking table tests of a one-third scale, twostory, one-bay steel moment frame in which quasi-brittle beam-to-column fractures occurred: (a) change in beam deflected shape; (b) change in moment distribution in adjacent members; (c) generation and propagation of elastic waves; and (d) initiation of dynamic modal response at the member level. Owing to the highly transient nature of these phenomena, they were observed to have second-order effects on overall behavior of the system. In comparison, the reductions in local strength and stiffness caused by the fractures had much more significant effects on system behavior.

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Section: Experimental Protocolmentioning

confidence: 99%

Section: Wave Velocity Strain Gages Placed Along the Beams As Shown Inmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Local fracture‐induced phenomena in steel moment frames

Rodgers¹,

Mahin

2008

Earthq Engng Struct Dyn

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“…Kim et al [2] conducted shaking table tests on a one-bay two-story steel frame under simulated earthquake loading, and the secondorder inelastic behavior of the frame was investigated. Rodgers and Mahin [3] carried out a series of shaking table experiments and numerical simulations on a one-third scale two-story one-bay moment-resisting steel frame in order to study the effects of the connection fractures.…”

Section: Introductionmentioning

confidence: 99%