Subscribe to the gold package and get unlimited access to Shamra Academy
Register a new userStability Analysis And Behavior Of Segmental Stone Retaining Walls (SRW) Under Static And Seismic Loadings
دراسة سلوك و استقرار الجدران الاستنادية الحجرية المصنعة (SRW) تحت تأثير الأحمال الستاتيكية و الزلزالية
2160
1 76
0
(
0
)
Added by
Tishreen University ورقة بحثية
Publication date
2016
fields
Geotechnical Engineering
and research's language is
العربية
Created by
Shamra Editor
Ask ChatGPT about the research
تعتبر الجدران الاستنادية من أكثر أنواع المنشآت الهندسية انتشاراً و كانت الجدران الاستنادية تنفذ من الأحجار الطبيعية قبل اكتشاف البيتون، حيث تعتبر الحجارة الطبيعية من أوائل المواد التي استخدمها الانسان في بناء المنشآت الهندسية منذ آلاف السنين، و تشهد على ذلك العديد من المنشآت في الحضارات القديمة التي لاتزال آثارها موجودة حتى الآن. و بعد اكتشاف البيتون و البيتون المسلح قلت نسبياً الجدران الاستنادية المنفذة من الأحجار الطبيعية، و لكن رغم هذه السنين لم تفقد ألقها و بريقها حتى الآن، و ازداد الاهتمام في السنوات الأخيرة بمواد البناء الجديدة التي تتركب من أحجار مصنعة حيث تم استخدامها إلى جانب مواد البناء التقليدية في عدة مجالات سواء في الهندسة الجيوتكنيكية أو الأبنية ....الخ, فهي لا تقدم حلولا تقنية بسيطة و حسب بل تعتبر مرغوبة بشكل كبير لأسباب جمالية و لسهولة تنفيذها و مقاومتها للعوامل الخارجية ، إضافة إلى انها تقدم حلولاً اقتصادية بكلفة محدودة مقارنة بالجدران الاستنادية التقليدية من البيتون المسلح. و هذا البحث يتناول دراسة سلوك هذه الجدران الاستنادية الحجرية تحت تأثير الأحمال الستاتيكية و الديناميكية و دراسة بارامترية لأهم العوامل المؤثرة على استقرار هذه الجدران.
The retaining walls are one of most types of engineering constructions and it have built from natural stones before discovering concrete, Where natural stones have considered one of the early human materials used in building engineering constructions for thousands of years, and many facilities in ancient civilization still existing effects so far, And after the discovery of the concrete and reinforced concrete, the retaining walls which was built from natural stones diminished relatively Despite the years this retaining walls has not lost its luster and brilliance, and there is increased interest in recent years in using new building material which consists of manufactured stones where used together with traditional construction materials in several areas both in geotechnical engineering or building … Etc . This retaining walls present simple technical solutions and it is desirable for aesthetic reasons and simple implementation and resistance to external conditions, In addition to being economical solutions limited cost compared to traditional reinforced concrete retaining walls. This research deals with the study of the behavior of Segmental Stone Retaining Walls (SRW) under the static and dynamic loads and parametric study of the most important factors which influence stability of these retaining walls.
References used
BATHURST,R.J ; CAI, Z. Pseudo – Static Seismic Analayses of Geosynthetic - Reinforced Segmental Retaining Wall. Geosynthetics International, Vol.2, No.5,1995, pp.787-830
SAM M. B; HELWANY. M; BUDHU, and DAVID McCALLEN. Seismic Analysis of Segmental Retaining Walls.2001
RICHARD BATHURST. SRW's and geosynthetic reinforcements have revolutionized Civil Engineering for earth retaining structures.1999
rate research
Read More
The behavior of the basaltic shear diaphragms of the remaining buildings of ancient times
was investigated as experimental research,and its resistance to natural factors and
horizontal loads resulting from wind and earthquakes,to take advantage of
them in the
maintenance of modern buildings,which are associated with floors and beams as horizontal
shear diaphragmsIn the hot and cold areas of the African continent, Asia and other similar
areas,to replace the reinforced concrete shear diaphragms,and metal shear diaphragms that
lose their resistance to the above factors. When the buildings are inspected, the vertical and
slanted slits resulting from the side loads are placed,it was found that the appearance of the
cracks related to the hardness of the shear diaphragm section, the basalt stone
specifications and the design of the shear diaphragm base.The research was conducted
to determine the durability, water permeability and resistance to pressure and tensile
strength of basalt stone samples used in historic stone buildings and their location in
laboratory methods.Horizontal loads resulting from seismic intensity were determined on
the front of the building at the tile level according to international requirements and
specifications.The method of calculating the basaltic shear diaphragms was
applied by applying arithmetic to build a basalt stone from several floors and a basement,
taking into account the characteristic resistance of basalt, depending on its density from
pressure and stretching and basalt stone in calculating.
Frame structures contribute to resist the seismic loads. On the other hand, frames
work efficiently to increase the ductility of buildings. Therefore, 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 effect of inserting steel shear wall on the resistance of
the reinforced concrete frame against earthquake loads. In this study, Finite Element
Method (FEM) using Geometrically and Materially Non-Linear Analysis (GMNLA) was
performed. Pushover analysis is used to explore the behavior of the steel plate in-filled
reinforced concrete frame against lateral loads. Moreover, the effect of plate thickness was
undertaken. On the other hand, an opening is made in this plate. Then, the influence of the
position and dimension of this opening on the resistance was observed.
This study shows that using a steel plate shear wall with or without opening can
enhance the resistance to seismic loads significantly together with the deflection decrease.
Braced frames and steel plate shear walls (SPSWs) have both been shown
to be useful in the seismic retrofit of buildings. While both
these systems have merit, no guidance exists to determine which of the
two approaches is preferable in terms of pr
oviding maximum
displacement ductility and energy dissipation per cycle for a given
strength. This paper describes and compares results from numerical
evaluation using FEM, in which the nonlinearity of materials and the
nonlinear effects of the large displacement was included for tow frames.
The results of numerical study was identical to the experimental tests,
then a barometric study was achieved by changing the thickness of infill
plate then the area of the cross sections of braces, after that the width of
the frame was modified.
The result shown that using steel infill plate is preferable when the
dimension of bay is three times the height, while using braces is more
adequate for frames in which the dimension of bay is less than three times
the height.
RC moment-resisting frames (RCMRFs) have commonly been used for low-to-moderate rise buildings in
seismic prone regions. RCMRFs can perform well when they are subjected to strong earthquake ground
motions if they are properly designed and detailed
to dissipate the seismic input energy through
deformations in inelastic range. The connections between beams and columns thus become critical
components to the performance of these structures.
In conventional RCMRF connections, the width of the beam does not exceed the width of the column.
Adopting a flat beam system for the design scheme provides many advantages, such as the reducing the
amount of formwork required, the simplicity for repetition, and the decrease of the required story height.
RCMRFs with flat beams have been used extensively, despite the lack of sufficient information on how
this system behaves under earthquake loading which leads the codes to restrict the use of flat beamcolumn
connections in earthquake prone regions.
The surface hardening by shot peening (S-P) is one of the processes used to increase the hardness of aluminum alloys surface. This step tends to increase of the fatigue strength
for this alloy because of the creation of compressive residual surface
stress layer, which resists the initiation and propagation of cracks. But in some cases, the opposite of this effect occurs, the fatigue strength decreases because of the initiation of surface micro cracks. The influence of this process on the fatigue strength of two aluminum alloys 1050A and 2219 was investigated. (S- N) curves are determined for two surface conditions produced by shot peening and uppeening. As well as the alloys were studied under loading programme low-high & high-low. This paper deduced that the fatigue life of aluminum alloy 1050A was reduced by a percentage of (23%) because shot peening caused high surface roughness, and consequently high local stress, but the fatigue life of aluminum alloy 2219 was increased by about (38%) because the shot peening caused the creation of compressive residual stresses.
Log in to be able to interact and post comments
comments
Fetching comments
Sign in to be able to follow your search criteria
