Compound-element modeling accounting for semi-rigid connections and member plasticity

Liu, Yuxin; Xu, Lei; Grierson, Donald E.

doi:10.1016/j.engstruct.2007.07.026

Cited by 25 publications

(8 citation statements)

References 9 publications

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“…Once the above‐described effect of joint damage is taken into account, the inelastic rotational tangent stiffnesses R p and the semi‐rigid rotational tangent stiffnesses R c are modified accordingly. By using these two modified rotational stiffnesses, it can be shown (Liu et al, 2008) that the compound rotational stiffness degradation factor can be expressed as for each member end affected by joint damage. From , the stiffness degradation factor for the compound element is a function of the degradation factors of the connection and member inelasticity, such that if any of these factors degrades to zero, the stiffness of the compound element degrades to zero as well.…”

Section: Effects Of Connections and Joint Damagementioning

confidence: 99%

“…A local failure mode of a member consists of a number of plastic hinges, as discussed in the following. Similar to section failure, as described in recent work (Liu et al, 2008), the rotational failure of a semi-rigid connection can be modeled by a four-parameter model that accounts for strain hardening or softening behavior. Figure 1 illustrates the failure of connections recovered from the WTC 5 building that partially collapsed on September 11, 2001(FEMA 403, 2002.…”

Section: Failure Modes Of Componentsmentioning

confidence: 99%

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Influence of Semi‐Rigid Connections and Local Joint Damage on Progressive Collapse of Steel Frameworks

Liu

Grierson

2010

Computer aided Civil Eng

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Section: Effects Of Connections and Joint Damagementioning

confidence: 99%

Section: Failure Modes Of Componentsmentioning

confidence: 99%

Influence of Semi‐Rigid Connections and Local Joint Damage on Progressive Collapse of Steel Frameworks

Liu

Grierson

2010

Computer aided Civil Eng

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“…[21], [22], [23], [24]. The efficiency arises from the fact that non-linear effects are taken into account in the stiffness matrix without extra iterations, and the use of natural elements means a small number of unknowns in the final global system of equations.…”

Section: Component Methods For End Plate Joints Modeling Of 3d Framesmentioning

confidence: 99%

Component method for end plate joints, modeling of 3D frames: literature review

2012

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“…which is called an end-fixity factor in the analysis of semi-rigid frameworks (Liu et al 2008) and a stiffness degradation factor in the analysis of inelastic frameworks (Liu 2009). If a semi-rigid framework is associated with the development of member plasticity, Eqn 5 may represent a combined degradation factor applied for progressive collapse .…”

Section: Nature Of Suspended Floorsmentioning

confidence: 99%

Seismic Performance and Storey-Based Stability of Suspended Buildings

Liu

2014

Advances in Structural Engineering

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Buildings designed with floors suspended on mega supporting structures (core tubes/frames) are referred to as suspended buildings. Such buildings can meet some practical requirements such as the gaining of large open spaces. Some aspects, including seismic performance and structural stability, however, are not completely understood by the engineering community. This motivated an investigation into the performance of suspended buildings subjected to gravity and ground earthquake motion. The stability of suspended floors and their mega supporting structures is discussed in relation to P-delta effect. A suspended-floor section is able to gain stiffness from gravity, but the stability of its mega supporting structure may be a problem due to the up-shifted gravity. This leads to a discussion of the storey-based stability method for assessing the critical load multipliers to be applied to the supporting frames. In view of the pros and cons of suspended buildings, a passive control system with three-performance levels is presented using pendulum floors and connection dampers to dissipate energy and avoid pounding. Optimal control system parameters were studied in order to help with the selection of connection stiffnesses and damping coefficients during the design of suspended buildings. Initial results show that, as opposed to a pendulum TMD, the large suspended-floor masses themselves play a key role in reducing the seismic response, and buildings are able to be designed as types of suspended systems which are effective against strong earthquake motion combined with gravity.

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Compound-element modeling accounting for semi-rigid connections and member plasticity

Cited by 25 publications

References 9 publications

Influence of Semi‐Rigid Connections and Local Joint Damage on Progressive Collapse of Steel Frameworks

Influence of Semi‐Rigid Connections and Local Joint Damage on Progressive Collapse of Steel Frameworks

Component method for end plate joints, modeling of 3D frames: literature review

Seismic Performance and Storey-Based Stability of Suspended Buildings

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