plan irregularity causes local damages being concentrated in the irregular buildings. progressive collapse is also the collapse of a large portion or whole building due to the local damages in the structure. the effect of irregularity on the progressive collapse potential of the buildings is investigated in this study. this is carried out by progressive collapse evaluation of the asymmetric mid...

This paper examines differences in performances of a range of torsionally stiff and flexible single story buildings designed with the provisions of Iranian Standard 2800. Seismic nonlinear dynamic time history behavior of eight building models subjected to seven horizontal bi-directional design spectra compatible ground motions are investigated. These models cover a wide range of very torsional...

near-fault ground motions have caused very much damage in the vicinity of seismic sources during recent earthquakes. it is well known that under specific circumstances, intensive ground shakings near fault ruptures may be characterized by short-duration impulsive motions. this pulse-type motion is generally particular to the forward direction, where the fault rupture propagates towards the site...

Data collected from shake table tests of two, approximately one-third scale, two story flat plate frames utilizing shear reinforcement, as well as data from prior tests, were evaluated to assess the inter-story drift ratios when punching failures occur for reinforced concrete and post-tensioned slab-column connections with and without shear reinforcement. The drift ratios at punching for the sh...

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...

This paper presents measurement and analysis of the dynamic response of a five-story building to very-high frequency excitation (> 100 Hz) from blasting vibrations originating from a contiguous excavation of rock. Velocity response measurements, in the rock and on the structure, were employed to calculate time correlated dynamic displacement response of the building to blasting. Time correlated...

The Incremental Dynamic Analysis (IDA) represents a promising design approach to assess the performance and post-earthquake load carrying capacity of steel frames. Generally, only maximum transient inter-story drift is considered as damage intensity measure (DM), when IDA carried out. In Authors' opinion, better appraise all aspects characterizing state structures, additional DMs should be cons...

Semi-active base isolation system has been proposed mainly to mitigate the base drift of isolated structures while in most cases, its application causes the maximum acceleration of superstructure to be increased. In this paper, designing optimal semi-active base isolation system composed of linear base isolation system with low damping and magneto-rheological (MR) damper has been studied for co...

In order to evaluate repairability (i.e., repair time and cost, etc.), it is necessary estimate the amount of labor (person-day) for caused by seismic damage. The purpose this study obtain fundamental information establishing relation model between L per unit floor area inter-story drift angle R L-R model). We analyze effects structural non-structural components failure mode members, on relatio...