Application of endurance time method in performance-based optimum design of structures

Basim, Mohammad Ch.; Estekanchi, Homayoon E.

doi:10.1016/j.strusafe.2015.05.005

Cited by 79 publications

(37 citation statements)

References 35 publications

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“…The Normalized Relative Residual (NRR) for each response spectra quantity is separately computed according to Equations (10), (11), (12). NRR integrates residuals over at all times and periods.…”

Section: Proposed Methodsmentioning

confidence: 99%

“…Rahimi and Estekanchi [10] have applied the ET method in collapse assessment of buildings. Basim and Estekanchi [11] have investigated the application of the ET method in performance-based design of structures and proposed a practical optimum design procedure. Tafakori et al [12] have presented an ET-based methodology for probabilistic loss estimation in which the ET method is used as a demand propagation prediction tool.…”

Section: Introductionmentioning

confidence: 99%

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Optimal Objective Function in Simulating Endurance Time Excitations

2018

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Endurance Time (ET) method is a dynamic analysis procedure in which increasing excitations are imposed on structures; these excitations are known as Endurance Time excitation functions (ETEF). This study presents a method to find the optimal objective function for simulating ETEFs which unconstrained optimization problems are. In optimization problems, equations are defined in term of an objective function. In the problem of simulating ETEFs, the objective function can be defined in many different ways regarding considered intensity measures and respective weighting factors. In addition, the type of calculating residuals (absolute way or relative way) diversifies objective function definitions. The proposed method for determining optimal objective function includes quantifying the accuracy of ETEFs in a scalar quantity regardless of their objective functions and introducing an approach to overcome the dependence of results on initial points of optimizations. The proposed method is applied and results are then presented. It is observed that considering only acceleration spectra and calculating residuals in the relative way creates more accurate ETEFs.

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Section: Proposed Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimal Objective Function in Simulating Endurance Time Excitations

2018

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“…The methodology of ET method is summarized in Figure 1.The most important component of ET method is ET acceleration functions: "ET excitation functions are in the form of artificial accelerograms created in such a way that each time window of them from zero to a particular time produces a response spectrum that matches a template spectrum with an increasing scale factor" [12]. The ET accelerogram is created so that at a predefined time (tTarget ) its response spectrum reaches a pre-specified template response spectrum.…”

Section: Concept Of Endurance Time Methodsmentioning

confidence: 99%

“…Results revealed that the ET method predicts the linear seismic performance of shell structures with acceptable precision and significant reduction in analysis time. Basim and Estekanchi [12] studied application of ET method in value-based seismic design of structures. They introduced new design methodology based on the total value of the structure namely Value Based Design (VBD) of structures by the use of ET method.…”

Section: Introductionmentioning

confidence: 99%

Evaluating Performance of Concrete Special Moment Resisting Frames with Different Seismic Coefficients Using Endurance Time Method

Radmanesh

Mohammadi

2018

CivileJournal

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This performance-based study was conducted to investigate the effects of seismic coefficients on performance of concrete special moment frames of 5,7, and 10-storey buildings located in Tehran, Iran. The structures are designed three-dimensionally by ETABS 2016 software according to ACI-318-08. Fifteen specimens were designed with different base shears having seismic coefficients of 0.7, 0.85, 1, 1.15, and 1.30 times the proposed value of Iranian Standard 2800, (i.e. decreased by 70 and 85%, and increased by 115 and 130%). Endurance time method (ETA20in series of ET acceleration function) as well as three real earthquake records was employed to evaluate the seismic performance of the modeled structures. The performance of structures was compared by the time of the first plastic hinges formation in beams and columns, the time of entering to nonlinear region and the time of experiencing storey drift of 2% corresponding to the life safety performance level. It was observed that the results of ET records and real records were similar to each other. A procedure was proposed for finding optimum structure with lower weight using ET method through defining efficient ratio (ER) and cost ratio (CR). Based on the results of ER/CR ratio and considering the importance of collapse prevention performance level, optimum structure was a 7-storey structure with lower weight or cost whose seismic coefficient had been reduced by 70%. It was concluded that high safety can not be achieved simply by increasing the seismic coefficient of structures.

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“…In ETA, performance of structures at different hazard levels is evaluated by a single time history analysis, whereas in incremental dynamic analysis, performance evaluation at each hazard level requires a distinct time history analysis that demands excessively long computational times for seismic evaluation. In the past decade, several studies have concentrated on the implementation of ETA in performance evaluation of structures …”

Section: Introductionmentioning

confidence: 99%

An investigation on the interaction of moment‐resisting frames and shear walls in RC dual systems using endurance time method

Estekanchi

Harati

Mashayekhi

2018

Structural Design Tall Build

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Summary Reinforced concrete (RC) dual systems are composed of RC moment‐resisting frames (MRFs) and RC shear walls, where MRFs are barely designed to handle gravity loads. Investigations have demonstrated that shear walls exert negative effects on the upper part of MRFs. In this paper, the interaction of shear walls and MRFs is inspected using endurance time (ET) method. ET is a dynamic time history‐based pushover procedure in which structures are exposed to a set of predefined intensifying ET acceleration functions. In this method, seismic performance of the considered structure is assessed based on earthquake return periods; during which, required predefined seismic performance objectives are fulfilled. In this study, several buildings with RC dual systems were designed based on the conventional codes. Next, their nonlinear duplicates were generated for the application of the ET analysis. It was revealed that shear wall elements impose considerable rotational demands—exceeding the criteria established by ASCE41‐13—on the beams and columns, especially those located on the upper parts of the buildings. This paper puts forth and reviews certain methods to cushion the negative effects brought about by RC shear walls, along with a detailed discussion on their merits and demerits.

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Application of endurance time method in performance-based optimum design of structures

Cited by 79 publications

References 35 publications

Optimal Objective Function in Simulating Endurance Time Excitations

Optimal Objective Function in Simulating Endurance Time Excitations

Evaluating Performance of Concrete Special Moment Resisting Frames with Different Seismic Coefficients Using Endurance Time Method

An investigation on the interaction of moment‐resisting frames and shear walls in RC dual systems using endurance time method

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