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Register a new userThe Effect of Axial Force on the Behavior of Bolted flush End-plate single-sided beam-to-column moment connections
تأثير القوة المحورية على سلوك الوصلات الفولاذية جائز-عمود أحادية الجانب المقاومة للعزوم والمنفذة ببراغي و صفيحة جبهية غير بارزة
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تعتبر الوصلات الفولاذية جائز-عمود المنفذة ببراغي و صفائح جبهية و المستخدمة في إطارات المنشآت ذات الأسقف المائلة و في الإطارات الطابقية القابلة للانزياح الجانبي معرضة لتراكب عزوم انعطاف و قوى محورية حيث يمكن أن تبلغ القوة المحورية قيماً كبيرة . إن العديد من التوصيفات الحديثة لكودات التصميم الخاصة بالوصلات المعدنية تهمل تأثير القوة المحورية على سلوك الوصلة إذا كانت قيمتها منخفضة حيث أن الكود الأوروبي EN-1993-1-8 يشترط عدم تجاوز القوة المحورية (ضاغطة أو شاده ) 10% من المقاومة اللدنة لمقطع الجائز من أجل تطبيق طريقة المركبات المعتمدة في الكود لتصميم الوصلات . يتلخص هدف البحث في دراسة تأثير القوة المحورية على سلوك الوصلات الفولاذية جائز-عمود أحادية الجانب المقاومة للعزوم و المنفذة ببراغي و صفيحة جبهيه غير بارزة. تم وضع نموذج عددي ثلاثي الأبعاد للوصلة المدروسة يعتمد طريقة العناصر المنتهية باستخدام برنامج الحساب CATIA من أجل تقييم سلوك الوصلة تظهر نتائج التحليل اللاخطي للوصلة أن تطبيق قوة شد على الوصلة يخفض مقاومة الوصلة بشكل ملحوظ مقارنة مع حالة خضوع الوصلة لعزم فقط و من جهة أخرى فإن تطبيق قوة ضاغطة منقولة من الجائز إلى الوصلة تسبب زيادة في مقاومة الوصلة الحدية للعزوم إلى حد معين , حيث عند حدوث التحنيب في جناح الجائز المضغوط فإن مقاومة الوصلة للعزوم تميل إلى الانخفاض.
Flush end-plate beam-to-column joints often subjected to a combination of bending and axial forces .The level of axial forces in the joint may be significant in case of: sway frames under horizontal loads, pitched roof portal frames and irregular frames.. Many of design codes neglect the effect of axial force in the connection analysis as it is usually low. Eurocode 3 limits the axial force acting on the joint to 10% of the design plastic resistance of the connected member cross section to apply component method. The objective of this paper is to discuss the behavior of flushend-plate connections under a combination of bending and axial tension or compression forces For the nonlinear finite element analysis the modeling process was carried out using CATIA computer program. The results of the finite element analysis of the connection showed that by applying the tensile axial load of the beam into the connection, the ultimate bending capacity of the connection will decrease. On the other hand, by applying compressive axial load of the beam to the connection, the ultimate bending capacity of the connection will increase at first; but after the buckling of the compressive flange of the beam takes place, the total capacity of the connection tends to decrease.
References used
Pertold, J. R. Embedded steel column bases I. Experiments and numerical simulation. Journal of Constructional Steel Research,France,18,2000, 56-77
da Silva, L., Lima, L., Vellasco, P. Behaviour of flush end-plate beam to column joints under bending and axial force.4, Journal of Steel Composite Structures ,Portugal,2004,77-94
Gang Shi,Y,M. Finite element analysis of beam-column bolted end-plate connections in steel frames.8, Department of Civil Engineering, China, 2007,88-99
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In this research, we discussed an analytical
study of the seismic behavior of an internal joint, and we improved
the plastic response of the joint after observing the effect of the
concrete encasement to the column’s steel section along the
connection area.
This research deals with analytical study of exterior Beam-Column
connections behavior under seismic load.
Tow parameters were considered: axial load on the column and
confinement of joint region with stirrups.
Ansys program was used to analytica
l study of three types of exterior
Beam-Column connections under cyclic load.
The results were shown a good agreement with general behavior of
three types.
The analytical results indicate that the tow parameters will improve
the behavior of the connections delay cracking at joint core and
increasing connection stiffness in rotation and displacement with
decreasing shear value at joint.
This research presents an experimental study about the effect of steel fibers on the
main variables of stress- strain curve for high strength concrete on simple compression,
which are: shape of stress- strain curve, ductility factor, energy absorpt
ion capacity. For
this purpose, series of cylinders concrete specimens were prepared in compressive strength
(70 MPa). the steel fiber with aspect ratio of L/D =70 were added at the volume fractions
of (0-1-1.5-2)%. The cylinders were tested under a monotonic loading at compression, and
as a result of the tests, the total curve of stress- strain was obtained. The experimental
results of research showed a positive effect of steel fibers on the behavior of high strength
concrete, this effect increased with increasing volume fraction of steel fibers. It can be seen
from stress-strain curve, whereas the slope of the ascending branch is not much affected.
The descending branch of the stress- strain curve decreases by the increase in the fiber
volume fraction. This means the ductility and toughness improve with the addition of steel
fibers and as a result the behavior of high strength concrete has gone far away from being
brittle as it is used to be.
After passing through the allowable stresses stage Cold
Formed Steel Frames fail under instability secure, these frames are
designed to resist loads in the elastic stage [7]. Many efforts are
being made to increase their performance by using speci
al bolted or
welded connections [13], such as rigid connections or plastic
connections, stiffened and built-up sections [1] could be used to
increase the sections resistance.
In rigid connections [11], stiffeners are added to insure the flexural
behavior of these connections [10] while the plastic deformation
occurs at the Horizontal Boundary Element (beam) and far from the
face of the column, such as stiffened bolted Apex connection.
In plastic connections, the cold formed steel frame will produce
high ductility performance through the nonlinear behavior by
reaching the maximum bearing capacity of the bolts. Depending on
this principle we should insure the elastic behavior of the boundary
elements, and avoid local buckling by using high strength cold
formed profiles and slipping bolted connections, the rotation of this
slotted connection in certain angle after reaching the bearing
capacity, will act as a plastic hinge that absorbs the extra stresses
which will affect the steel frame due to the lateral loads such as
Cyclic forces
Our subject contains studying criterions which ensuring a durable serving of concrete
frame joints, and then choosing two connections according to its deployment and the
availability of its arithmetic relations and easy to be prepared from local ma
terials, and
discuss experimental results of the resent study which allow us to achieve the next part of
our research,which is a structural designing programme by visual basic language to serve
the work in order to be fast and precise.
the last part of the subject is comprising a number of actualizations which confirm
that the process of programming is correct, and then compare the results of experimental
programs and code with our programme results to achieve many important ameliorations
on this programme to become more easily and better.
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