Showing papers by "Homayoon E. Estekanchi published in 2009"
Journal Article•
TL;DR: In this paper, several steel moment frames have been considered and their responses have been evaluated under a set of scaled earthquakes and a group of various damage indexes, which included cumulative and non cumulative, cyclic fatigue based, deformation based and modal parameter based, has been considered.
27 citations
25 citations
Journal Article•
TL;DR: In this paper, the accuracy of the Endurance Time method in estimating average deformation demands of low and medium rise steel frames using ETA20f series of ET acceleration functions has been investigated.
16 citations
01 Jan 2009
TL;DR: Endurance Time (ET) as mentioned in this paper is a new dynamic analysis procedure that aims at estimating seismic performance of structures by subjecting them to predesigned intensifying acceleration, which is designed in a way that they approximately simulate earthquakes with different intensities through their duration.
Abstract: Endurance Time (ET) method is a new dynamic analysis procedure that aims at estimating seismic performance of structures by subjecting them to predesigned intensifying acceleration. These acceleration functions are designed in a way that they approximately simulate earthquakes with different intensities through their duration. Performance of the structure is judged based on its behavior for different intensity measures through time. A set of three acceleration functions have been produced using the ET concept by applying optimization techniques. These acceleration functions are designed in such a way that their response spectrum, while complying with typical code design spectra, intensify uniformly with their duration. Potential applications of this method are described by evaluating the performance of sample SDOF and MDOF systems. The pros and cons of ET method are investigated. The feasibility of application of ET method as a tool in performance based seismic analysis and design is discussed.
15 citations
01 Jan 2009
TL;DR: In this article, column shortening and differential shortening between columns and walls in concrete frames are calculated using a nonlinear staged construction analysis based on the Dirichlet series and direct integration methods.
Abstract: This paper attempts to calculate column shortening and differential shortening between columns and walls in concrete frames using a nonlinear staged construction analysis based on the Dirichlet series and direct integration methods. Prototype frame structures are idealized as two-dimensional and the finite element method (FEM) is used to calculate the creep and shrinkage strains. It is verified with respect to published experimental and analytical results. B3 model and methods such as AAEM, EMM, IDM, and RCM are used for verification purposes. For each frame, effects of creep and shrinkage parameters such as relative humidity percent, rate of construction, shrinkage parameter, and concrete strength have been taken into consideration separately. The manner in which creep and shrinkage can influence the behavior of concrete structures also has been discussed.
4 citations