Multi-story, reinforced-concrete (RC) building structures with soft stories are highly vulnerable to damage due earthquake loads. The story causes a significant stiffness irregularity, which has led numerous buildings collapsing in previous seismic events. In addition the structural collapse, failure of non-structural components (NSCs) also been observed during past earthquakes. light this, thi...

In order to improve the damping capacity of building isolation system, this paper studies control system structure based on negative stiffness. paper, dynamic equation is derived and its parameters are optimized by H2 norm theory Monte Carlo pattern search method. Taking 5-story as an example, analyzes evaluates performance under actual earthquake. The results show that stiffness can traditiona...

The present study sought to explore the impact of story maps and audio podcasts as scaffolds on oral proficiency of Iranian EFL learners. The quasi-experimental study was launched with 36 EFL undergraduates in three groups by adopting a counterbalanced 3  3 Latin squared design. All participants were indiscriminately, but in a specified order, exposed to the three treatment conditions of story ...

in this paper, evaluation of torsional stiffness in beam and slab bridge deck elements is presented. a beam and slab bridge decks structurally behave as a grillage. a grillage has an efficient transverse load distribution due to transverse asymmetric load. in the case of bridge deck without transverse beams in the span, transverse load distribution depends on the torsional stiffness of longitud...

Abstract This paper examines the optimal placement, numbers, and shape of Buckling Restrained Braces (BRB) for a 3D shear-wall frame building structure based on linear static analysis utilizing ETABS software. The total amount BRBs referred to as number are considered design variables objective function be minimized is maximum story displacement inter-story drift. diagonal (D), X-shape (X), V-s...

Multi-story, old reinforced concrete (RC) structures with a “soft-story” on the ground floor, sustain considerable damage to soft story during earthquakes due presence of masonry infills in upper stories. Aspects such infill–RC frame interaction are briefly discussed and particular retrofitting scheme for is studied. It consists RC infills, added within bays floor frames combined jacketing surr...