Static Equivalency in Progressive Collapse Alternate Path Analysis: Reducing Conservatism while Retaining Structural Integrity

Ruth, Peter; Marchand, Kirk A.; Williamson, Eric B.

doi:10.1061/(asce)0887-3828(2006)20:4(349)

Cited by 124 publications

(40 citation statements)

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“…The results are shown in Table 2. The DIF is substantially below the widely used value of 2.0, which is in agreement with the conclusion of the literature [19]. It can be seen from Table 2 that the existence of the composite floor slabs improved the integrity performance of the structure and decreased the dynamic effect of the split column.…”

Section: (21)supporting

confidence: 81%

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Progressive Collapse Assessment of the Steel Moment-frame with Composite Floor Slabs Based on Membrane Action and Energy Equilibrium

Shi¹,

Wang²,

Dong³

2017

TOBCTJ

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Background and Objective:Progressive collapse resistance of the steel moment-frame with composite floor slabs can be assessed by sudden column loss scenarios. In order to investigate the progressive collapse-resistant capacity of the steel moment-frame with composite floor slabs, a simplified approach based on the theory of membrane action and energy equilibrium principle is presented, which assessed the behaviour of progressive collapse resistance of this frame subjected to the removal of a penultimate column via the static and dynamic analysis. Mateial and Method:The residual vertical bearing capacity model considering of the membrane action and tie force (TF) method of composite floor slabs is developed to evaluate the force mechanism of the composite floor slabs. An energy-based theoretical framework is proposed for calculating the maximum allowable dynamic demands based on the nonlinear static Pulldown analysis, which is used to explore the relationship between of dynamic and static response in the progressive collapse process. Furthermore, the finite element software SAP2000 is used to calculate the numerical example to verify the reliability of this simplified approach. Results:The results show that the composite floor slabs significantly improve the structural progressive collapse-resistant ability and this simplified approach evaluates the progressive collapse resistance of the whole structure effectively. Conclusion:The existence of the floor can increase the ductility of the structure, and increase the progressive collapse-resistant ability. The appropriate value of the DIF depends on the ductility and amount of inelastic action the structure would experience during the column removal scenario.

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Section: (21)supporting

confidence: 81%

“…The dynamic impact factor (DIF), which is widely used to account for dynamic effects within a static design framework, is usually recommended for 2.0tabl [19]. Since the large deformation and nonlinearity of the structure under the progressive collapse condition are not well considered, the value of 2.0 is quite conservative.…”

Section: Dynamic Impact Factormentioning

confidence: 99%

Progressive Collapse Assessment of the Steel Moment-frame with Composite Floor Slabs Based on Membrane Action and Energy Equilibrium

Shi¹,

Wang²,

Dong³

2017

TOBCTJ

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“…Powell compared the results obtained by different analysis procedures and concluded that using dynamic increase factor of 2.0 in linear static analysis may be conservative [6]. In addition, the research conducted by Ruth et al also showed that the value of 1.5 was suitable for linear static analysis of steel frame structures considering dynamic effect [7]. Kim and Kim performed APM on steel frame structures whose results showed that nonlinear dynamic analysis would result in larger responses in structures than static analysis [8].…”

Section: Introductionmentioning

confidence: 99%

Progressive Collapse Analysis of Latticed Telecommunication Towers under Wind Loads

Gao

Wang

2018

Advances in Civil Engineering

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As the antenna-supporting structures, latticed telecommunication steel towers are considered as critical members of telecommunication infrastructures. It is necessary to perform progressive collapse analysis of lattice telecommunication towers under wind loads. e present study conducts a nonlinear dynamic analysis on 50 m high typical standard latticed telecommunication tripole tower and angle tower by alternative load path method. e finite element models for two towers subjected to design wind loads are developed by ABAQUS. e analysis results show that, for 50 m high standard tripole tower, the member failure in the first three tower sections from tower top would not trigger the collapse of the tower. From the fourth tower section to tower bottom, the member failure at certain wind direction may cause a collapse. For 50 m high standard angle tower, the single member failure in any tower section would not cause the collapse of the tower. A dynamic sensitivity index is proposed to identify the most unfavorable wind direction for tripole tower and angle tower. A progressive collapse fragile curve based on collapse probability of telecommunication tower under wind loads is proposed to assess the anticollapse performance of the towers.

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“…The simulation models used in previous studies differ from each other in many ways and can be classified into distinct groups based on the model features: (1) the type of analysis: linear or nonlinear-that can significantly affect the response of the structure as documented in Marjanishvili and Agnew (2006), where a comparison between different analyses shows that the predicted responses can vary significantly when performing static/dynamic and linear/nonlinear analyses, (2) the typology of elements: continuum, beam-column elements or a combination of both have been successfully used for modeling local and global phenomena of progressive collapse: examples of micro-models can be found in Khandelwal and El-Tawil (2007), Sasani and Kropelnicki (2008), Kwasniewski (2010), and Bao et al (2008), while examples of macro-models are those utilized in Kaewkulchai and Williamson (2004), Bao et al (2008), and Bao and Kunnath (2010) and an example of the use of hybrid models is reported in the work of Alashker et al (2011), (3) the dimension of the model: planar or three dimensional-that is crucial in capturing spatial effects: most of the published work were conducted on two-dimensional structures (Khandelwal and El-Tawil 2007;Bao et al 2008;Kim et al 2009) and very few on three-dimensional models (Ruth et al 2006;Alashker et al 2011) making the comparison of results very challenging, (4) the floor system, modeled using a collection of beam-column, shell or brick elements , which plays a key role in determining the response of three-dimensional structures, as shown by Yu et al (2010), Alashker et al (2011) and Li and El-Tawil (2014), (5) the loads applied on the structure, which can include only the self-weight or the self-weight and a fraction of the design dead/live loads.…”

Section: Introductionmentioning

confidence: 99%

Modeling of RC Frame Buildings for Progressive Collapse Analysis

Petrone

Kunnath

2016

Int J Concr Struct Mater

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Abstract:The progressive collapse analysis of reinforced concrete (RC) moment-frame buildings under extreme loads is discussed from the perspective of modeling issues. A threat-independent approach or the alternate path method forms the basis of the simulations wherein the extreme event is modeled via column removal scenarios. Using a prototype RC frame building, issues and considerations in constitutive modeling of materials, options in modeling the structural elements and specification of gravity loads are discussed with the goal of achieving consistent models that can be used in collapse scenarios involving successive loss of loadbearing columns at the lowest level of the building. The role of the floor slabs in mobilizing catenary action and influencing the progressive collapse response is also highlighted. Finally, an energy-based approach for identifying the proximity to collapse of regular multi-story buildings is proposed.

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Static Equivalency in Progressive Collapse Alternate Path Analysis: Reducing Conservatism while Retaining Structural Integrity

Cited by 124 publications

References 1 publication

Progressive Collapse Assessment of the Steel Moment-frame with Composite Floor Slabs Based on Membrane Action and Energy Equilibrium

Progressive Collapse Assessment of the Steel Moment-frame with Composite Floor Slabs Based on Membrane Action and Energy Equilibrium

Progressive Collapse Analysis of Latticed Telecommunication Towers under Wind Loads

Modeling of RC Frame Buildings for Progressive Collapse Analysis

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