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Study on Cast-in-place Floor Slab in Frame Structureachieving "Strong Olumn Weak Beam" Mechanism by Finite Element Analysis

Author: JingZuoQin
Tutor: LiJin
School: Xi'an University of Architecture and Technology
Course: Architecture and Civil Engineering
Keywords: monolithical slab reinforced concrete frame structure earthquakeresistant design effective flange width static nonlinear analysis
CLC: TU352.11
Type: Master's thesis
Year: 2013
Downloads: 23
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Abstract


"Strong column and weak beam" is one of the basic principles of structuralseismic design. Under the action of the earthquake, we hope frame beam than the framecolumn breakage occurs first when we design the structures, and through the beamhinge consume the earthquake energy, avoid the structure collapse. However the actualseismic damage survey results show that the framework does not achieve the desired"strong column and weak beam" failure pattern, instead more show as "strong beamweak column" failure modes. Related studies have shown that no reasonableconsideration of cast-in-place floor slab of frame beam flexural bearing capacity of thereinforced effect is influence yield frame structure to achieve the "strong column andweak beam" mechanism is an important factor. Structure design and analysis generallyassume that floor is rigid, ignoring the cast-in-place floor slab’s contribution to theframe beam bending bearing capacity, this simplified approach does not accord withreality, and which is mainly composed of column hinge structure causes the yieldfailure mechanism, easy to cause collapse of the whole structure, so it is necessary tothe cast-in-place floor slab to the frame structure to yield formation mechanism throughanalyzing the influence degree.This paper uses the finite element software SAP2000, respectively set up withoutthe cast-in-place floor slab entity and with the cast-in-place floor slab frame structurecalculation model, and according to the relevant specification for structural design.Adopt the method of static lateral loading, the contrast analysis of two calculationmodels yield mechanism of difference, And on this basis, by reducing the differentwidth within the scope of the cast-in-place floor slab on both sides of the frame beam toestablish a set of analysis models, and the group comparison models for the static nonlinear analysis of lateral load, By analyzing the state of beams and columns in theplastic hinge yield and the formation of a plastic hinge at the end of the developmentprocess of the group contrast models, and further research the area of the cast-in-placefloor slab to participate in the beam end bending and the influence degree of yield toformation mechanism of the framework structure. Through the calculation principle ofpull equivalent to calculate the beam effective width, and the effective flangerecommended values is given. Finally, and related regulations in the currentspecification, considering the bearing capacity of the cast-in-place floor slab to framebeam bending contributions, then, improvement design Suggestions are proposed toensure the frame structure can still achieve the seismic fortification target that understrong earthquakes the frame structure do not collapse.

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CLC: > Industrial Technology > Building Science > Building structure > Special Structure > Anti - shock structure,disaster prevention structures > Shock, isolation, and explosion-proof structure > Seismic structure
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