Direct displacement-based seismic design of flexible-base structures subjected to pulse-like ground motions

Lu, Yang; Hajirasouliha, Iman; Marshall, Alec M.

doi:10.1016/j.engstruct.2018.04.079

Cited by 26 publications

(11 citation statements)

References 57 publications

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“…It is shown that a 0 parameter has the most significant effect on the seismic performance of a soil‐structure system . In conventional building practice, a 0 takes the value between 0 and 3 for fixed‐base structures to those with severe SSI effects The building Aspect ratio defined as

\overset{H}{true} / r

, which is usually considered as the second interacting parameter …”

Section: Details Of Structure Foundation and Soil Conditionmentioning

confidence: 99%

“…For example, Ganjavi and Hao and Ganjavi et al conducted an extensive parametric nonlinear dynamic analysis to achieve near optimum seismic design solutions for SSI multistory shear buildings using the concept of uniform distribution of damage. In another relevant study, Lu et al investigated the seismic response of multistory shear such as structures considering SSI effects using a wide range of design parameters. Based on the results of their study, they developed an improved SSI replacement model and proposed a practical site and interaction‐dependent performance‐based seismic design methodology for flexible‐base structures.…”

Section: Introductionmentioning

confidence: 99%

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Effects of soil‐structure interaction and lateral design load pattern on performance‐based plastic design of steel moment resisting frames

Ganjavi

Gholamrezatabar²,

Hajirasouliha

2019

Structural Design Tall Build

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Summary The effects soil‐structure interaction (SSI) and lateral design load‐pattern are investigated on the seismic response of steel moment‐resisting frames (SMRFs) designed with a performance‐based plastic design (PBPD) method through a comprehensive analytical study on a series of 4‐, 8‐, 12‐, 14‐, and 16‐story models. The cone model is adopted to simulate SSI effects. A set of 20 strong earthquake records are used to examine the effects of different design parameters including fundamental period, design load‐pattern, target ductility, and base flexibility. It is shown that the lateral design load pattern can considerably affect the inelastic strength demands of SSI systems. The best design load patterns are then identified for the selected frames. Although SSI effects are usually ignored in the design of conventional structures, the results indicate that SSI can considerably influence the seismic performance of SMRFs. By increasing the base flexibility, the ductility demand in lower story levels decreases and the maximum demand shifts to the higher stories. The strength reduction factor of SMRFs also reduces by increasing the SSI effects, which implies the fixed‐base assumption may lead to underestimated designs for SSI systems. To address this issue, new ductility‐dependent strength reduction factors are proposed for multistory SMRFs with flexible base conditions.

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\overset{H}{true} / r

, which is usually considered as the second interacting parameter …”

Section: Details Of Structure Foundation and Soil Conditionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of soil‐structure interaction and lateral design load pattern on performance‐based plastic design of steel moment resisting frames

Ganjavi

Gholamrezatabar²,

Hajirasouliha

2019

Structural Design Tall Build

Self Cite

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“…Thus, both frame and shear wall systems have their own displacement ductility and equivalent viscous damping. The displacement ductility of the shear wall can be calculated by Equation (12), whereas for the equivalent viscous damping of the shear wall can be calculated using Equation (13) [13].…”

Section: ) Ddbd Concept For Dual Systemmentioning

confidence: 99%

“…This design shear force and flexibility of the structure always link to each other. Meanwhile, in the performance-based design, to predict the design shear forces of the structure during the earthquake in order to achieve the expected structural performance, further calculation using the Direct Displacement Method might be necessary [11], [12].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Seismic Performance Based on A Direct Displacement-based Method

Wijaya

Soegiarso

Tavio

2019

Int. J. Adv. Sci. Eng. Inf. Technol.

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Commonly, in the design of the seismic-resistant building, the force-based method has been popularly adopted to distribute the effect of earthquake forces to the building structure. This concept uses forces as an approach to simulate the impact of the earthquake on a building. To predict lateral forces of a building structure due to earthquake, Direct Displacement-Based Method (DDBM) can be introduced as an alternative solution. The performance level of a building structure can be categorized based on its damage level. In this paper, the performance-based evaluations were carried out according to ATC-40, FEMA 356, FEMA 440, and nonlinear time history analysis with seven ground motion (Denali,

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“…Tzimas et al studied collapse risk and residual drift performance of steel buildings equipped with post-tensioned moment-resisting frames and viscous damper in near-fault regions [23]. Number of recent studies investigated effects of near-fault strong ground motions on seismic-induced demand [24,25], seismic design code [26] and direct displacement-based design methodology [27]. According to the mentioned researches regarding fragility assessment of structures against near-fault strong ground motions, they give emphasis to the collapse limit state.…”

Section: Introductionmentioning

confidence: 99%

Effects of Near-fault Strong Ground Motions on Probabilistic Structural Seismic-induced Damages

2019

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Seismic fragility curves measure induced levels of structural damage against strong ground motions of earthquakes, probabilistically. These curves play an important role in seismic performance assessment, seismic risk analysis and making rational decisions regarding seismic risk management of structures. It has been demonstrated that the calculated fragility curves of structures are changed while the structures are excited by near-field strong ground motions in comparison with far-field ones. The objective of this paper is to evaluate the extents of modification for various performance levels and variety of structural heights. To achieve this goal, Incremental Dynamic Analysis (IDA) method is applied to calculate seismic fragility curves. To investigate the effects of earthquake characteristics, two categories of strong ground motions are assumed through IDA method, i.e. near and far-field sets. To study the extent of modification for various heights of structures, 4 – 6 and 10 stories moment-resisting concrete frames are considered as case studies. Furthermore, to study the importance of involving near-field strong ground motions in seismic performance assessment of structures, the damage levels are considered as the renowned structural performance levels (i.e. Immediate Occupancy, Life Safety, Collapse Prevention and Sidesway Collapse). Achieved results show that the fragility curve of low-rise frame (i.e. 4-story case study) for IO limit state presents more probability of damage applying near-fault sets in comparison with far-fault set. Investigating fragility curves of the other performance levels (i.e. LS, CP and Collapse) and the higher frames, a straightforward conclusion, regarding probability of damage. To achieve the rational results for the higher frames, mean annual frequency of exceedance (MAFE) and probability of exceeding limit states in 50 years are calculated. MAFE is defined as the integration of structural fragility curve over seismic hazard curve. According to the achieved results for 6-story frame, if the structure is excited by near-field strong ground motions the probability of exceedance for LS, CP and collapse limit states in 50 years will be increased up to 11%, 2.4%, 0.7% and 0.4% respectively, comparing with the calculated probabilities while far-field strong ground motions are applied. On the other hand, while the 10-story case study is excited by near-field strong ground motions, the exceedance probability values for mentioned limit states decreases up to 20%, 5%, 4% and 4%, respectively. Consequently, it can be concluded that the lower is the height of the structure, the more will be the increment of probability of damage in the near-field conditions. Furthermore, this increment is much more for IO limit state in comparison with other limit states. These facts can be applied as a precaution for seismic design of low-rise structures, while they are located at the vicinity of active faults.

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Direct displacement-based seismic design of flexible-base structures subjected to pulse-like ground motions

Cited by 26 publications

References 57 publications

Effects of soil‐structure interaction and lateral design load pattern on performance‐based plastic design of steel moment resisting frames

Effects of soil‐structure interaction and lateral design load pattern on performance‐based plastic design of steel moment resisting frames

Evaluation of Seismic Performance Based on A Direct Displacement-based Method

Effects of Near-fault Strong Ground Motions on Probabilistic Structural Seismic-induced Damages

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