Yong Jun Deng

Seismic Behavior Analysis on the Steel Cold-Formed in Modular House

The cold-formed thin-walled steel has such advantages as light-weight , good seismic capability and is suitable for reconstruction in seismic disastrous area. Nonlinear analysis by software ANSYS on the performances of static and dynamic of a 2 -story building has been done. The analysis reveals that: (1) under the conditions of participation in the earthquake, the top lateral value of structural is large and the maximum is 9.985 mm, but all lateral displacement values standard requirement. (2) Based on the analysis under three kinds of seismic waves, the corner roofing of second independent room has much larger displacement values than others, torsion has been happened on structure. (3) Under the seismic wave, the maximum value is 2.47 which happened on the 400cm/s2 of Taft wave; structure has obviously response under Taft wave。

Based on the Numerical Simulation of Random Aggregate Concrete Model of the Penetration of the Two Material Models

Based on the micromechanics principle, establish concrete random aggregate, constitutive model choose HJC model and K&C model, numerical Simulation for the part of the S.J.Hanchak projectile penetrating into concrete targets test. Through the bullets remaining projectile velocity and target plate failure compared, it is concluded that Concrete mesostructure uneven impact of its macro mechanics; flaking and spallation phenomena on the HJC model simulation of the target body front and back by the impact appears less effective, and K&C model is in good agreement with the experimental conditions; K&C model is a simple and effective way to predict the dynamic response of the projectile penetrating into concrete targets.

Numerical Analysis on Seismic Performance of Beam-Column Joints Strengthened by Top and Seat Angles in the Added-Storey Steel Frame

Based on the ANSYS platform, set up five finite element models of beam-column joints strengthened by top and seat angles, analysis its seismic performance and discuss how the width and thickness of the angle affect it. The results showed that: (1) Strengthened by top and seat angles can effectively reduce the stress of the weld in the column, relocated the plastic hinge, increased the ductility and the energy dissipation capability of the structure. (2) As the width and thickness of the angle increase, the bearing capacity of the joint improved, but its hysteretic behavior and energy dissipation were decreased.

Numerical Simulation on the Overall Dynamic Response of One High-Rise Steel Frame

Using the finite element analysis software ANSYS to analyze the overall dynamic response of one specific high-rise steel-frame,including modal analysis, spectrum analysis and time-history analysis. Then do a comparative analysis with the results of calculation by the professional software PKPM. As the results: the structural calculation can use layer model; Larger mutations appeared in the stress of weak-story and the relevant story need to reinforce or set up supports under the anti-seismic design in the elastic time-history analysis of structure; Y-direction translation is preferentially happened in first order modal shape and lateral-torsional coupling happened in third order modal shape among the vibration mode analysis; The response spectrum analysis of frequent earthquake show that seismic action is more serious in ground layer.

Experimental Research Treatment Measures of Joint on Paper Cellular Wallboard

Abstract: the paper introduces the advantages and disadvantages of the honeycomb core composite wallboard, and put forward various solutions on the problems that the honeycomb core composite wallboard on juncture place easily crack. According to the advantages and disadvantages, the optimal measures are to use CFRP paste connection joints. Tested by experiments, the results show that: for using cellular wall materials as new buildings retaining wall materials, CFRP enhancement processing juncture surface can effectively restrain cracks, and the results are ideal; for existing buildings retaining wall, gives suggestions about enhancement processing, and proves its feasibility.

Research on Mechanical Behavior of Reinforced RC Beams Strengthened with Anti-Arch Method

We analyze the mechanical property of strengthening RC beam by using the method of arch pasting with carbon fiber and directly pasting CFRP through numerical simulation and model test. It explains that strengthening RC girder by using the method of arch can solve the influence of beams loading by the second time which exists in the method of pasting CFRP in strengthening reinforced concrete beams and it can improve the girders load when it cracks and the carrying capacity; decreasing the deflection deformation and crack width and gap when the girder carries load; It can make the most use of the character of carbon fibers high strength. The results play very important role of guiding to engineering.

Seismic Damage Analysis and Reinforcement Measures Research of a Long-Span Structure

Abstract: Taking a Practical Big Span Stadium Project as the Background, in View of its Particularity that it Suffered Earthquake Damage and Fortification Intensity Increased after Earthquake, through the Field Detection and Finite Element Model to Analyze Earthquake Damage of Structure Caused by Wenchuan Earthquake, and Research the Feasibility of Seismic Strengthening with Hadas on the Structure Whose Fortification Intensity Increased after Earthquake. the Results Show that: 1) the Big Span Structure Severely Damage by the Earthquake, the Second Layer Is Relatively Weak Layer, Prone to Local Damage and Affect Whole Anti-seismic Performance of Structure, 2) Hadas Can Increase the Initial Stiffness and Effectively Reduce the Structure Seismic Response, Has Better Effect on Overall Reinforcement, 3) it Is Reasonable to Improve the Seismic Fortification Intensity of this Region.

Simulation Calculation Analysis of RC Beam Strengthened with Carbon-Fiber by Reverse-Arch Method

Using utilities equipment to make the reinforced concrete girder to generate a kind of reverse-arch radian, then paste CFRP on the under-part of the girder, after the CFRP was maintained, unload, at this time, the CFRP is working together with the primary reinforced concrete girder. Using analysis software ANSYS to simulate this process, comparing with the RC beam strengthened with carbon-fiber directed, a conclusion was got that is the deflection of a RC beam strengthened with carbon-fiber by reverse-arch method is much smaller and the CFRP to bear much loads than the ordinary method. The conclusion can be a reference to the similar projects.

The Seismic Behavior Analysis of the Light-Duty Steel Structure Residence System

The light-duty steel structure residential demonstration project is analyzed by mode-superposition response spectrum method, the elastic and elastic-plastic time-history analysis, push-over analysis, which used the finite element software ETABS and PKPM. The safety is assessed. The seismic behavior of this structural system is analyzed under different site classification, design characteristic and seismic intensity, and is compared with the ordinary steel structure, concrete structure, masonry structure. The results show that, this structural system can meet the current codes under frequent and rare earthquake action. But the column has a surplus stable stress values. And it is suitable for application in large areas in China. In high intensity areas and compared with the different structure system, it shows that the lateral has the main effect on this structure.

The Damping Energy Dissipation Study on Buckling Restrained Brace in Multilayer Steel Frame

The buckling-restrained brace has stable energy dissipation capability. It has been widely used in recent years. This paper uses finite element software ANSYS to do non-linear time history analysis for Center Braced Steel Frame, Eccentrically Braced Steel Frame, Buckling-restrained Braced Steel Frame under the earthquake. The results show that: (1) The peak acceleration, residual displacement and top floor displacement of buckling-restrained braced steel frame is smaller than the other two brace frames, provide support for the structure stability. (2) The damping energy and bracing energy dissipation capability of buckling-restrained braces and eccentrically braced are strong, so it can avoid the collapse of the main structure under the large or medium earthquake.