fatemeh jadali

Katouli is regarded as the most eastern dialect of the Mazandarani language that in addition to some differences in words, is different from Mazandarani to some extent in verbal constructions such as continuous preterit construction and the infinitives used in past and present verbs. In the present study, verbal stem, personal ending and constructions, infinitive, subject and object adjectives as well as active and passive forms have been investigated in Katouli dialect. In this dialect, verb is based on the past and present stems. The present verb has indicative, subjunctive and continuous constructions, and the preterit verb also has simple, continuous, progressive, present perfect, subjunctive and past perfect constructions. In Katouli dialect, the passive form also is not common as it exists in Persian language and the informants prefer using the active structure. The main characteristics of the verb in Katouli dialect which is important in language studies include: lack of present perfect tense as it is common in Persian and using simple past instead of it, not using prefix in present indicative verb construction, using the past stem of kœrd in past continuous construction and some other characteristics which are mentioned in this paper.

In the seismic analysis of structures, estimation of amount of damages to the elements is of great importance. In the quantitative method of estimating damages, it is possible to assess damages to the storey and the total structure by introducing damage indices. The results of studies show that damage indices could be used as a suitable basis in assessing the function of structure against back and forth forces of earthquake excitations. These indices are calculated based on functions of deformation, and dissipated energy of elements in frames. In this study, the steel moment-resisting frames with 4, 7, 10, 15, 20, and 25-story and 3 and 5 bays are designed and then, they are modeled in OpenSees software in order to investigate the performance of steel moment-resisting frames under seismic excitations by using damage index. In the following, nonlinear dynamic time history analysis is conducted and the damages of aforementioned frames are calculated quantitatively and the results showed that the behavior of high-rise, mid-rise, and low-rise frames were affected based on their vibration periods and dependent to the nature of the studied earthquakes.

This study aims to assess the effect of slit dampers on chevron braced frame in steel structures with different number of stories under one-way and cyclic loadings. To assess and compare the results, a parametric research was performed on slit, non-slit and cavity dampers. 8 single-story and single-span frames in the form of moment frame, braced frame with non-slit damper, braced frame with slit damper, braced frame with cavity damper, and chevron 3-story frame with slit damper, chevron 5-story braced frame with slit damper and the 8-story chevron braced frame with slit damper were modeled and analyzed by ABAQUS finite element software. The results showed that the chevron braced frame with slit damper dissipated a large amount of earthquake input energy and reduced the base shear force with its behavior. Hysteresis curves with stability and without high dissipation indicated high energy absorption by the chevron braced frames equipped with slit dampers. In all chevron braced frames with slit damper, no plastic hinge was formed in the structural members, and the failure mode was concentrated in the slit damper element. Slit damper reduced the initial stiffness, secondary stiffness, and bearing capacity, which in addition to controlling the lateral displacement of the structure increased energy dissipation capability and ductility. The chevron braced frame with slit damper had a better ductility than other specimens and had a good seismic performance based on the results.