Table 1 - uploaded by Ahmed Abdelraheem Farghaly
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Building codes did not include requirements for special seismic detailing of reinforced concrete structures until the 1970's when several earthquakes demonstrated the need for more ductile design. These buildings are vulnerable to numerous failure modes including: failure of column lap splices; strong beam/weak column failures; captive column failu...
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Increasing volume of constructions and necessity of having economic structures lead to the production of high-strength reinforcement (HSR). HSRs have many benefits; however, because of limitation in producing ductile HSR and the effect of HSR in the reduction of overall ductility of reinforced concrete structures, its application has been limited i...
Due to the fact that the behavior of reinforced concrete structures is complex (nonlinear behavior) when they are subjected to gravitational or lateral loads, the computational cost when the entire model is considered is significant.
Thus, the aim of the present study is to show a relation between a full modeled structure and several types of reduc...
Citations
... Ahmed and Ali (2012) [1] studied performance based assessment methods and basic principles given in ECOL2008 and real time history analysis (TM) and a real three dimensional case study building and the results are compared. The authors showed that the performing methods of analysis with approaches using either ECOL2008 or TM independently produce a difference performance level for the critical storey of the two studied (old and new school buildings) structures. ...
... a shows the top displacement response of models (1),(2),(3), and (4) under different retrofit techniques, the low value of displacement was observed in the RC. Wall (1) retrofit technique for model(1).Figure 4-b shows the top acceleration response of models(1), (2), (3), and (4) under different retrofit techniques, the low value of top floor acceleration was observed in the steel diagonal bracing (1) retrofit technique for model(2).Figure 4-c shows the base shear force response of models (1), (2), (3), and (4) under different retrofit techniques, the low value of max. base shear was observed in the RC. ...
Past earthquakes have emphasized the vulnerability of existing structures which did not satisfy
modern seismic design requirements and current engineering standards even though they may have been
properly designed and constructed according to earlier codes. Many existing buildings may be inadequate and
pose severe risk during seismic events. To mitigate the seismic hazard, existing building should be rehabilitated.
The rehabilitation measures to upgrade the capacity of these structures can be performed at some point in their
useful lives. The evaluation of the seismic capacity of existing buildings and their deficiencies is essential for the
design of a rehabilitation technique. The aim of the evaluation and rehabilitation systems is either for collapse
prevention to ensure safety of the occupants or to control the damage to ensure the continuity of operation
during and after earthquakes. In this paper several retrofit techniques was evaluated by applicable them on
different kinds of existing structures to find the best one will be used for each kind of tested structures. Four
retrofit techniques (R.C. walls, steel bracing, column jacket, and column strengthen by 4 steel angles each
corner) were tested for each selected four existing structure. By examine each technique on each tested
structure, the values of top displacement, top floor acceleration, max. base shear, and period time of first mode
were varied by response of each applied retrofit techniques and the minimum response will be the choose as
arbitrator between different kinds of used techniques to use it as the optimal technique used to retrofit this
structure.
... Ahmed and Ali (2012) [1] studied performance based assessment methods and basic principles given in ECOL2008 and real time history analysis (TM) and a real three dimensional case study building and the results are compared. The authors showed that the performing methods of analysis with approaches using either ECOL2008 or TM independently produce a difference performance level for the critical storey of the two studied (old and new school buildings) structures. ...
... a shows the top displacement response of models (1),(2),(3), and (4) under different retrofit techniques, the low value of displacement was observed in the RC. Wall (1) retrofit technique for model(1).Figure 4-b shows the top acceleration response of models(1), (2), (3), and (4) under different retrofit techniques, the low value of top floor acceleration was observed in the steel diagonal bracing (1) retrofit technique for model(2).Figure 4-c shows the base shear force response of models (1), (2), (3), and (4) under different retrofit techniques, the low value of max. base shear was observed in the RC. ...
Construction on the hillside slope is more challenging to the structural engineer, especially under seismic load due to the presence of a powerful earthquake in addition to the forces of sliding slope itself. Regarding the population growth and narrowness of available lands, people take hillside slopes to build their houses. One of the main sources of seismic vulnerability in Egypt is represented by the instability of slopes; therefore, this is a subject of great significance, particularly in view of the growing attention that has been recently dedicated to the reduction of seismic hazard. This paper evaluates the seismic performance of Doronka city buildings constructed on rocky hillside slope and its foundations system by studying base shear, acceleration, and displacements. The stability of the slope was first evaluated under seismic loads and then the stability of constructed buildings was checked on the hillside slope. The results of study show that these buildings will collapse if subjected to earthquake even if its peak ground acceleration (PGA) magnitude is less than 0.25 g, but the hillside slope remains stable within a high earthquake magnitude.
