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The Research on Analysis of Frame Filled Wall under Seismic Action

Author: XiongZuo
Tutor: HeYiBin
School: Hunan University
Course: Structural Engineering
Keywords: Frame filled wall Low reversed cyclic loading tests Force-displacementcurve Stiffness degradation Finite element simulation Integrated model Horizontalbearing capacity
CLC: TU36
Type: Master's thesis
Year: 2013
Downloads: 40
Quote: 0
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Abstract


Frame filled wall is commonly used as a non-structural elements in the structuralsystem in China.A large number of theoretical studies have shown that the overallperformance of the Frame filled wall is better than the pure performance of theframework in the same seismic conditions: the former one has a greater lateralstiffness, better energy performance and better ductility. But with the subsequentexperience found that Frame filled wall is not always superior as a large number ofearthquake damage that can easily cause great damage to the structure when the infillwalls layout is unreasonable. So design Frame filled wall structure rationally isextremely important. The current specification of its seismic capacity have not submita complete solution, but only as a non-structural elements that do not participate inthe overall structural stress analysis, as the load is applied to the main structure, andframe structure’s natural period have an appropriate reduction. This thesissummarizes the research results of domestic and foreign scholars about Frame filledwall, launched a test and finite element study on its performance. Complete thefollowing:1. Designed and produced four different Frame filled walls, give a low cyclicload to observe the destruction process, to study the failure mechanism, and makingthe final hysteresis curve skeleton curve, make a comparison between thedisplacement at the top of the wall and the middle displacement, observe the bottomof the column longitudinal reinforcement and the right end of the beam longitudinalreinforcement strain variation, calculated its energy consumption performance andstiffness degradation curve. At last found that Axial compression ratio and Openingsrate have a big influence on the bearing capacity of the wall. and as the structuralstiffness down, the Anti-sidesway ability also have a decline.2. Using ABAQUS finite element software to produce four finite element modelsof the wall, monotonous displacement load is applied to observe the path ofdestruction of the finite element simulation, put forward the load-displacement curveand expand the comparison with the experimental results, the comparison results showthat the meta-model is feasible.3. Produced on the basis of Chapter Three, Chapter Four make fifteen differentFrame filled wall’s finite element model and have an analysis on these models.Fromthe analysis made a conclusion that the layout of the infill walls have a huge influence on the overall structure, and extract the Force-displacement curve of these models.Found that when the infill walls are uniform and reasonable it can greatly increase theultimate bearing capacity and the resistance to deformation. And the frame is hard tocollapse, the whole deformation process gently. But when the infill walls arrangeduneven because the stiffness of the framed filled wall is huge,infill walls can cause achange in stiffness of the structure, resulting in uneven distribution layer stiffness ofthe structure, seismic structure is extremely unfavorable. And the join of the framefilled wall make the framework structural’s rigidity center shift it may causeTorsion destroyed.When arrange the infill walls, openings infill walls may make theframe column to form a short column, easy to advance the horizontal force on theplastic hinge and it may cause the collapse of the building. Therefore it must be verycareful when design the Frame filled wall structure, to take reasonable measures toavoid an adverse impact on the main structure due to the setting of the infill walls.4. Using equivalent bracing model to see the frame filled wall as the one at bothends of the diagonal struct hinged on the infill wall, assuming that the masonry infillwalls’s bearing capacity is shared by the frame and infill walls, have a formula tocalculate single-layer single-span frame masonry infill wall’s horizontal bearingcapacity, the results is nearly the same as the finite element simulation results, so theformula is feasible.

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