Journal of Civil Engineering Researchers
Volume:1 Issue: 7, 2017

Iran plateau lies in a high seismic zone and very seismic events of magnitude 6 or greater were recorded in long term period oflasttimes.historical events involving ground cracking and fissuring with faults displacement took place in last years. The recent seismic events have led to concerns on safety and vulnerability of RC buildings, which were most designed for gravityand limited lateral loads in the past devoid of any ductile detailing of joints. This paper presents a 3D nonlinear static analysis for seismic performance evaluation and assessment in the form of capacity curve of an existing two-story reinforced concrete frame building.The building have columns with fixed supports at base, reinforced concrete frame and flat slab systems at different floor levels. The seismic displacement response of the RC frame building is obtained using the 3D pushover analysis. The 3D static pushover analysis was carried out using SEISMOSTRUCT incorporating inelastic material behavior for concrete and steel. Moment curvature and P-M interactions of frame members were considered in software. The damage modes includes a sequence of yielding and failure of members and structural levels were obtained for the target displacement expected under design earthquake.

With makingof new materials and usethose in construction projects, engineers and designers innovate various new structural forms which can be used in tall buildings execution. The structural form of building must be resist all combination of vertical and lateral loads. In general non-structural considerations have important effects in select of structural form and can be determinant. Furthermore, in slender and taller buildings structural parts have more importance and hence necessity to select of better structural form is more concern. In this paper dynamic response and performance of tall buildings with structural Tubular System(TS) and Bundled Tube System(BTS) against lateral loads have studied and compared. For this purpose, quadrangular plan by different heights have adapted. Spectralanalysis has performed and the effect of parameters such as height of building, participation of higher modes, shear lag and the stiffness of perimeter beams have assessed. Thisresearch showed that performance of Bundled tube system structures from the view of above parameters variety is better than structural Tubular System and workable especially in shear lag reduction.

Concrete-filled steel tubular (CFT) columns are being more widely used in the construction of high-rise buildings, bridges, subway platforms, and barriers. Their usage provides excellent static and earthquake-resistant properties, such as high strength, high ductility, high stiffness, and large energy-absorption capacity. CFT columns provide the benefits of both steel and concrete. This Paper present a review about the investigation done on behaviour of concrete filled steel tube columns by various researchers.

This studyfocus push-over analysis technique for performance-based design of steel building frame works subjected to earthquake loadingusing SPA2000. Through the use of a plasticity-factor that measures the degree of plasticisation, the standard elastic and geometric stiffness matrices for frame elements are progressively modified to account for nonlinear elastic–plastic behaviour under constant gravity loads and incrementally increasing lateral loads. The proposed analysis technique is illustrated for two steel frameworks of solid and hollow member properties. This research studies are aimed at analysing the comparison between hollow and solid frames. The technique is based on the conventional displacement method of elastic analysis. The analytical procedure developed is to estimate the inelastic deformations of beams, columns and connections are validated by incorporating the same in pushover analysis. It has been observed that the inelastic displacement of the structure is within the collapse prevention level.