Applied Mechanics and Materials Vols. 275-277

Abstract: In this paper, based on the Guangzhou Pazhou Bridge ,the acceleration and dynamic deflection was tested synchronously under normal operating conditions. Power spectral density analysis of the measured signal was done with frequency domain analysis methods.The measured value was compared with the finite element calculated value.The studies are as follows: first, the acceleration and deflection power spectral density function shows a multimodal distribution；the vibration frequency is concentrated in the low frequency range；the bridge vibration energy is concentrated in the first three frequency.Second, the actual operating conditions of Pazhou Bridge is good and it has a good bearing capacity. Third，the bridge impact coefficient measured maximum value is much greater than the national specification values.The researchs can provide the basic data for study on bridge health monitoring system development and bridge vibration signal separation technique.

Abstract: During the design process of Unit type curtain wall, there are lots of problems which are worthy of exploring and need to be addressed. Through the International Plaza curtain wall engineering, the methodology of design is that forming a cross-section of steel and aluminum combination by inserting steel ferrule in to unit male frame and the female frame; meanwhile, by using a reasonable design to the shape and size, we can meet the requirement of the overall strength and stiffness of the unit mullion. Mechanical model, actual design of the project parameters and drawing conditions, which detail the design process and calculation results, are reasonable enough for curtain walls researchers and designers.

Abstract: This article based on the characteristics and energy-saving requirements of light steel structure housing maintenance, summary of applies respectively situated in the light steel structure residence in various parts of the external wall, roof, and exterior window of common building materials, While discuss and analyze advantages and disadvantages of various material combinations, and finally according to the site material characteristics put forward the corresponding improvement measures.

Abstract: In order to study the floor damage depth of 7122 working face in the Qinan Coal Mine, we used Key strata theory and elastic-plastic theory to analyze the activities mechanisms and characteristics of the surrounding rock. By theoretical calculation obtained floor strata failure depth 8.79m of 7122 Face Mining; The horizontal distance of from the greatest floor damage depth to the coal wall is about 5.71m; The goaf floor failure distance is about 25.44m. Combined with the results of plasticity theory, we had drawn floor damage feature maps of 7122 working face in Qinan Coal Mine.

Abstract: In order to study the seismic stress performance of the reinforced concrete frame assembly fly ash plate sandwich polyurethane composite wall insulation system (FW). In this paper, 2 bay single-layer single-span hollow fly ash plate sandwich polyurethane in filled frames were tested under low cyclic horizontal loadings with different ratio of high to width and different stiffness frame . Based on the experiment, the damage process, failure mode, load carrying capacity are studied. The interaction between the fly ash plate sandwich polyurethane infill walls and the overall frame of constraint system are investigated. The results indicate that the bearing capacity has little related to height-width ratio of wall; sandwich polyurethane wall panels and frame has good integrity and energy dissipation capacity; the ratio of high to width smaller, ductility of wall is better . After study the failure pattern of the specimen, we know that the bearing capacity of fly ash powder polyurethane thermal insulation wall is not accord with formula of seismic shear of not bearing masonry.

Abstract: The experimental results show that the deck of the bridge displays obviously orthotropic features; shear nails with reasonable density can increase the binding capability of each part of deck pavement and overall mechanical performance. The results of fatigue test on the two groups of specimen indicate that the composite deck pavement added with the shear nails and the transition layer of steel fiber concrete has no sign of fatigue failure after 8.3 million fatigue loading tests, and its fatigue resisting property is obviously better than the deck pavement where the asphalt concrete is directly paved on the surface of deck, that is to say the service life of the deck pavement can be extended by the use of steel fiber concrete layer.

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: Shear wall systems are the most commonly used lateral-load resisting systems in high-rise buildings. The building of nonlinear dynamic analysis model is the basis for calculating earthquake response. The work further investigates several nonlinear dynamic analysis models at home and abroad for RC shear wall. Classified and brief comments about the existing drawbacks of these models are conducted. Hysteretic rules, relative parameters and the applicability of these models are also discussed in detail. Lastly, some useful suggestions are proposed for the further research.

Abstract: Analysis the fire behavior of the reinforced concrete frame structure from three aspects: the fire scene simulation, the temperature distribution and the deformation calculation of structure. Applying the actual temperature curves based on fire simulation software FDS to finite element analysis software ANSYS, get the temperature distribution and the deformation of structure under fire. Results show that structure will be destroyed because of the beams under fire are reaching the fire resistance, and the calculation results can meet the requirement of specification. Finally, the practical application shows the feasibility of getting the temperature-time curves with FDS instead of the international standard temperature-time curves for fire process analysis.

Abstract: This paper uses the SAP2000 to establish different beam column connections of steel frame structure finite element model, comparative analysis of the beam column for the rigid connection, hinged, semi-rigid connections of steel frame structure, the dynamic characteristics of structure displacement and internal force influence. At the same time, the dynamic time-history analysis method for structural displacement supplementary checking, analysis of structural response to seismic wave degree．The results showed that：compared with rigid, the structure of semi-rigid connections to the larger natural period，and with the rotation stiffness decreases vibration period increases; Semi-rigid steel frame connection to reduce the resistance to push the layer stiffness，making the structure of the horizontal displacement increased．