Papers by Keyword: Plastic Hinge

Abstract: this paper uses SAP2000 structure analysis software, designed a span of 60 m, rise-span ratio 0.25 of the double-layer spherical reticulated shell, the presence of isolation bearing of two kinds of structure forms are studied, firstly analyzes the dynamic characteristics of the two, and then used in the program focus on plastic hinge theory considering the material nonlinear and geometry nonlinear effect. EL selected seismic waves along the structure of the three-input, two structures were carried out on the elastic-plastic time history analysis.The results show that the original structure and isolated structure failure mechanism are basically the same, belong to dynamic instability failure. Structure by reducing the overall level of structure stiffness to make structural natural vibration period increases, large extent reduce the seismic response of the upper structure; And isolation structure improves the structure damage boundary peak acceleration, delay the time the collapse of the structure.

Abstract: This paper makes research on the stiffness of CFT column and steel beam joint with inner stiffening ring by using finite element analysis (FEA) program ANSYS. Analysis result indicates that the most important factor influencing the stiffness of the joint is the height of cross-section of beam while the thickness of the web plate hardly has any influence on the stiffness. The M-θ model of the CFT joint given by this paper can be used in practical design.

Abstract: According to the quasi static test of reinforced concrete frame with construction joints in, the fracture crack sequence, fracture morphology and plastic hinge are studied in detail. Research shows that two kinds processing method of construction joint will not affect the destruction form of a frame structure, but destruction order .

Abstract: During alternate loading cycles, as during earthquakes, the structure behavior becomes inelastic. This is particularly the case for steel structures. They show a better ability to absorb earthquake energy. This energy dissipating capacity is described by the q global behavior factor as used in the Eurocode 8. However, in other earthquake codes, it is expressed by R letter and in others only the X and V shapes bracing systems are taken into account in the seismic design. In this work, a method for determining the global q behavior factor is presented for eccentrically braced steel frames that are designed to resist seismic loads.

Abstract: In this paper, elasto-plastic dynamic response analyses of 300m span arch trusss structure model are carried out under the condition of earthquake by using SAP2000. The geometric and material nonlinear effects are considered. Based on the plastic-hinge theory, by gradually increasing the peak acceleration of earthquake, the structures dynamic elasto-plastic analysis have been done with Ninghe wave under the initial condition that the arch trusss stress and strain are caused by constant load and snow. According to simulation results, the critical peak acceleration is obtained when the steel framework lose stability, which can judge the anti-seismic capacity of the structure.

Abstract: In this paper, the elasto-plastic dynamic analysis on dynamic failure behaviors of steel double-layer grids supported by tridimensional truss columns used in a gymnasium with the function of earthquake victims shelter under disaster earthquake is carried out under EL-centro wave with SAP2000, and the appraisal results on their anti-failure performances are presented under strong earthquake action based on the plastic-hinge theory. In the analyses, the geometric and material nonlinear effects are considered simultaneously based on the plastic-hinge theory. The plastic development level of the rod, the deformed shape and the failure type and the ductility are estimated by plastic hinge principle. The results show that the failure model of the structure under the earthquake wave action is the complicated combination of strength failure and elasto-plastic dynamic local buckling in deferent areas of the structure; When the structure reached its failure critical limit, the development of the plastic hinges is not sufficient and only 5.11% of the rods enter into their plastic stage; Its critical failure peak acceleration of EL earthquake wave when applied in the combination of three directions is 705gal and can be served as earthquake victims shelter in the area of 8 degree seismic fortification; Its displacement ductility coefficient is 2.39,which shows the structure owns good energy dissipation capacity.

Abstract: In this paper, the analysis on dynamic failure behaviors of steel cable-stayed double-layer grids used in a gymnasium with the function of earthquake victim shelter is carried out under EL-centro wave with SAP2000, and the appraisal results on their anti-failure performances are presented under strong earthquake action based on the plastic-hinge theory. In the analyses, the geometric and material nonlinear effects are considered simultaneously. The plastic development level of the rod, the deformed shape and the failure type and the ductility are estimated. The results show that the failure model of the structure under the earthquake wave action is the complicated combination of strength failure and elasto-plastic dynamic local buckling in deferent areas of the structure; When the structure reached its failure critical limit, the development of the plastic hinges is sufficient and 59.5%of the rods enter into their plastic stage; The ratio of its maximal failure node vertical displacement and its plane diameter is 1/115; Its critical failure peak acceleration of EL earthquake wave when applied in the combination of three directions is 3655gal, which is 8 times more than the official seismic fortification level of 8 degree (major earthquake, 0.2g) and can be served as earthquake victims shelter in the area of 8 degree seismic fortification; Its displacement ductility coefficient is 5.54,which shows the structure owns good energy dissipation capacity.

Abstract: In this paper, the elasto-plastic dynamic analysis on dynamic failure behaviors of steel double-layer grids supported by tridimensional truss columns used in a gymnasium with the function of earthquake victims shelter under disaster earthquake is carried out under EL-centro wave with SAP2000, and the appraisal results on their anti-failure performances are presented under strong earthquake action based on the plastic-hinge theory. In the analyses, the geometric and material nonlinear effects are considered simultaneously based on the plastic-hinge theory. The plastic development level of the rod, the deformed shape and the failure type and the ductility are estimated by plastic hinge principle. The results show that the failure model of the structure under the earthquake wave action is the complicated combination of strength failure and elasto-plastic dynamic local buckling in deferent areas of the structure; When the structure reached its failure critical limit, the development of the plastic hinges is not sufficient and only 9.99% of the rods enter into their plastic stage; The ratio of its maximal failure node vertical displacement and its short span is 1/331, which can meet the need for flexible non-structural attachment; The ratio of its maximal failure node horizontal displacement and its columns is 1/166; Its critical failure peak acceleration of EL earthquake wave when applied in the combination of three directions is 602gal, which is 1.5 times more than the official seismic fortification level of 8 degree (major earthquake, 0.2g) and can be served as earthquake victims shelter in the area of 8 degree seismic fortification; Its displacement ductility coefficient is 5.65,which shows the structure owns good energy dissipation capacity.

Abstract: In this paper, the analysis is carried out under EL-centro wave with SAP2000, and the appraisal results on their anti-failure performances are presented based on the plastic-hinge theory. In the analyses, the geometric and material nonlinear effects are considered simultaneously. The plastic development level of the rods, the deformed shape and the failure type and the ductility are estimated. The results show that the failure model of the structure under the earthquake wave action is the complicated combination of strength failure and elasto-plastic dynamic local buckling in deferent areas of the structure; Its critical failure peak acceleration of EL earthquake wave when applied in X directions is 747gal, which is 1.87 times more than the official seismic fortification level of 8 degree (major earthquake, 0.4g) and can be served as earthquake victim shelter in the area of 8 degree seismic fortification; Its displacement ductility coefficient is12.14,which shows the structure owns good energy dissipation capacity.

Abstract: In this paper, the elasto-plastic dynamic analysis on dynamic failure behaviors of steel double-layer latticed cylindrical shells with three circle centers used in a gymnasium is carried out under EL-centro wave with SAP2000, and the appraisal results on their anti-failure performances are presented under strong earthquake action based on the plastic-hinge theory. In the analyses, the geometric and material nonlinear effects are considered simultaneously based on the plastic-hinge theory. The plastic development level of the rod, the deformed shape and the failure type and the ductility are estimated by plastic hinge principle. The results show that the failure model of the structure under the earthquake wave action is complicated. Firstly the middle of the lower chord destroyed due to lack of tensile strength, then the stiffness of the integral structure degenerated, and ultimately lost its bearing capacity. Therefore, this structure has a high bearing capacity and good ductility.