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Register a new userTesting the Numerical Simulation Of The Behavior Of RC Frame With Damaged Plasticity Model
استخدام نموذج الضرر اللدن في اختبار محاكاة عددية لسلوك إطار بيتوني مسلح
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تهدف الدراسة في البحث عن قدرة النماذج العددية للتوصل لمحاكاة السلوك الواقعي للإطارات البيتونية المسلحة تحت تأثير الأحمال الدورية التكرارية.
This study aims to investigate the capacity of numerical models to reproduce the monotonic behavior of reinforced concrete framed structures.
References used
BIRTEL, V; MARK, P 2006, Parameterized Finite Element Modeling of RC Beam Shear Failure. Abaqus Users Conference
CARREIRA, DJ; CHU, KH 1985 Stress–strain relationship for plain concrete in compression, ACI Journal 82(6): 797– 804
HORDIJK, DA 1992, Tensile and tensile fatigue behavior of concrete; experiments, modeling and analyses, Heron.37(1):3-79
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Frame structures contribute to resist the seismic loads. On the other hand, many techniques were used to improve the resistance against lateral loads where steel shear walls are considered to be one of these ways.
This research aims to study the eff
ect of strengthening of the
reinforced concrete frames inserting perforated steel plate shear walls embedded within the frame. This study applied numerical analysis using Finite Element Method (FEM) using nonlinear pushover analysis based on geometrically and Materially Non-Linear Analysis (GMNLA) was performed. To study the behavior of the steel plate that seal the hall span of the reinforced concrete frame against lateral loads. Moreover, perforated steel plate was studied taking under consideration the effect of the number and the area of the perforations and strengthening of the perforations circumference on the resistance was observed.
This study conclude that using a perforated steel plate shear wall with reinforced- concrete frames and strengthening of the perforations circumference can enhance the resistance significantly beside that it decrease the frame deflection.
In this paper, spline approximations with five collocation points are used for the
numerical simulation of stochastic of differential equations(SDE). First, we have modeled
continuous-valued discrete wiener process, and then numerical asymptotic st
ochastic
stability of spline method is studied when applied to SDEs. The study shows that the
method when applied to linear and nonlinear SDEs are stable and convergent.
Moreover, the scheme is tested on two linear and nonlinear problems to illustrate
the applicability and efficiency of the purposed method. Comparisons of our results with
Euler–Maruyama method, Milstein’s method and Runge-Kutta method, it reveals that the
our scheme is better than others.
This study concentrate on the driven pile in sand soils, to study and inspect this
type of piles via minimized laboratory models in conditions similar to
field conditions, and compare research result with actual load tests.
The research examines the Capital Asset Pricing Model
(CAPM) in Damascus Stock Exchange (DSE), by using the
monthly excess returns of (8) companies listed in (DSE), for the
period of (2010-2013), and the monthly excess return of (DSE)
index (DWX)
for the same period.
The researcher concluded that there is a significant relation
between the volatility of the market excess return and the volatility of the excess returns of stocks of the examined companies, But the researcher also concluded that (CAPM) is not valid in (DSE), because of the failure in the statistical test. That the constant of the regression equation is not equal to zero and the slope of the security market line is not equal to the average excess return of the stocks of examined companies.
The researcher recommended that this study should be retested
when there are a suitable number of listed companies in order to
form portfolios that can diversify away the effect of the unsystematic risk of each company, and to retest the CAPM after
the crises, because the average excess returns for all of the
examined companies were negative. Finally, the researcher
recommended trying other models of asset pricing such as
Arbitrage Pricing Theory (APT), and (Fama) Multifactor Model.
This study aimed to examine the weak form efficiency of the
Damascus Securities Exchange (DSE). The study used the monthly
returns, adjusted for thin trading, of firms listed in the Damascus
Securities Exchange from 2009 until 2014 and applied var
ious tests
to examine the random walk behavior in returns: the unit root test,
the autocorrelation test, the runs test and the GARCH model. To
take the impact of the Syrian crisis into account when judging the
efficiency of the market, the study period was divided into three
periods, the pre-crisis period, the crisis period and the whole period.
The results revealed inability to reject the weak form efficient
market hypothesis for more than half of the studied firms. Also it
showed that the Syrian crisis, in general, has negatively affected the
efficiency of most of the studied firms.
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