Design of Steel Structures with LRFD Using Advanced Analysis

Chen, W.F.; Kim, S.E.

doi:10.1016/b978-008043320-2/50015-0

Cited by 30 publications

(48 citation statements)

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“…Although the explicit imperfection modeling method and the equivalent notional load method can well account for the effects of initial geometric imperfection [13], tedious work still exists. For both methods, the directions of the imperfections or notional loads should coincide with the directions of the deflections caused by the bending moments.…”

Section: Further Reduced Tangent Modulus Methodsmentioning

confidence: 99%

“…To eliminate this tedious work, the further reduced tangent modulus approach was proposed [13]. By including the effects of stiffness degradation due to geometric imperfection, the reduction factor of 0.85, which is determined by calibrating with the plastic-zone solutions, is used to further reduce the CRC-E, as given in equation (4.31).…”

Section: Further Reduced Tangent Modulus Methodsmentioning

confidence: 99%

“…The incremental force-displacement relationship in the global coordinate system may be symbolically expressed as [13] jg =kig …”

Section: Incremental Force-displacement Relationshipmentioning

confidence: 99%

“…The Practical Advanced Analysis Program (PAAP) developed by Chen and Kim [13] will be used to implement the numerical examples. The PAAP program is an educational version of the FORTRAN-based software that performs planar frame analysis for the prediction of the strength and behavior of structural systems.…”

Section: Scopementioning

confidence: 99%

“…Figure 4.9 shows a beam-column element subjected to axial force and end moments with semi-rigid connections at both ends. If the effect of connection flexibility is considered in the member stiffness, the incremental element force-displacement relationship of equation (4.27) should be modified as [13]:…”

Section: Connection Nonlinearitymentioning

confidence: 99%

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The Era of Finite Element

2011

Understanding Structural Engineering

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ACKNOWLEDGEMENTSI would like to express my deepest appreciation to my advisor and committee chairperson, Professor Wai-Fah Chen, for his guidance and motivation during my learning career at Purdue University and University of Hawaii at Manoa. Whether through our numerous meetings and e-mails I have learned a lot from Professor Chen.His patience and encouragement gave me the confidence and willingness to overcome the many difficulties encountered while doing this research. He has shown concerns for my academic career at graduate level and also for my future. I believe his valuable advice will benefit me throughout my future endeavors. Finally, I would like to present special thanks to my parents, for their consideration and support that made this work possible. III ABSTRACTThe trends for analysis and design of steel frames are indicated in this dissertation.The current practice consists of applying the first-order elastic analysis with amplification factors or second-order elastic analysis in combination with the AISC-LRFD interaction equations. Determination of the effective length factors and individual member capacity checks are necessary to select adequate structural member sizes. The direct analysis method is a second-order elastic analysis approach that eliminates the determination of effective length factors from the current AlSC-LRFD method. Unsupported member length is used to calculate the axial strength of a member. Equivalent notional loads and/or modified stiffness are applied together with the external loads to account for the effects of initial out-of-plumbness and inelastic softening. For both AlSC-LRFD and direct analysis methods, a structure is analyzed as a whole, but the axial and flexural strength of each member is examined individually. Inelastic redistribution of internal forces in the structural system cannot be considered. As a result, determined member forces are not correct and more conservative member sizes will be obtained. Moreover, member-based approaches cannot predict structural behaviors such as failure mode and overstength factor.The advanced analysis method considered in this work is a second-order refmed plastic hinge analysis in which both effective length factors and individual member capacity checks are not required. In addition, advanced analysis is a structure systembased analysis/design method that can overcome the difficulties of using member-based IV design approaches. Thus, advanced analysis is a state-of-the-art method for steel structure design.Several numerical examples are provided to show the design details of all three methods. The design requirements corresponding to each analysis approach are illustrated in these examples. The pros and cons of each method are discussed by comparing the design results.Advanced analysis is also a computer-based analysis and design procedure consistent with the features of performance-based design. Applying advanced analysis to performance-based fire resistance and seismic design are proposed. This dissertation shows advanced ana...

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Section: Further Reduced Tangent Modulus Methodsmentioning

confidence: 99%

Section: Further Reduced Tangent Modulus Methodsmentioning

confidence: 99%

“…The incremental force-displacement relationship in the global coordinate system may be symbolically expressed as [13] jg =kig …”

Section: Incremental Force-displacement Relationshipmentioning

confidence: 99%

Section: Scopementioning

confidence: 99%

Section: Connection Nonlinearitymentioning

confidence: 99%

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The Era of Finite Element

2011

Understanding Structural Engineering

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Concentrated Approaches for Nonlinear Analysis of Composite Beams with Partial Interaction

Carvalho¹,

Lemes²,

Silveira³

et al. 2021

ce papers

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Two plane displacement‐based formulations with concentrated nonlinear effects for numerical analysis of composite beams are presented here. The effects of geometric nonlinearity, plasticity and partial shear connection are considered. In these two approaches, the co‐rotational system is defined to allow large displacements and rotations in the numerical model. The first formulation is based to Strain Compatibility Method, where the sections strains are explicitly evaluated as well as the slipping at the steel‐concrete interface. Thus, the axial and flexural stiffness of the cross section is determined in each step of the incremental‐iterative process. The second methodology considers rotational pseudo‐springs at the finite elements ends to simulate of plasticity. Furthermore, the effects of partial interaction can not be simulated by the inherently rotational behavior of the pseudo‐springs. Thus, the cracking and partial interaction effects are approached through effective moment of inertia defined by normative criteria. Four composite beams are simulated with these two formulations and compared by the load‐displacements paths. In all numerical result findings these formulations are closed and accurate to the experimental data presented in literature.

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Stability of steel columns with bolted strengthening under preload: Experimental study

Wang

Jiang

et al. 2022

Journal of Constructional Steel Research

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Design of Steel Structures with LRFD Using Advanced Analysis

Cited by 30 publications

References 1 publication

The Era of Finite Element

The Era of Finite Element

Concentrated Approaches for Nonlinear Analysis of Composite Beams with Partial Interaction

Stability of steel columns with bolted strengthening under preload: Experimental study

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