Abstract:Being considered the effect of the shearing and moment of intertia,the Hamilton system of free vibration of the Timoshenko cantilever beams was set up. The circular frequency for the two ends eigenvalue problem was calculated by using the method of precise integration of eigenvalue counting theory. Then the free vibration was analyzed. Based on the free vibration of the uniform Euler beams, The correctness of this method was verified through the calculation result comparison with this method and the traditional method. Then the circular frequency of the Timoshenko cantilever beams with the consideration under the effect of the shearing and the moment of intertia was calculated. The comparison results show that the method is simple,practicable and with good precision.

Abstract:In view of the construction industry which has transformed from cosmically new-building into building-repairing mode,this paper takes the development of limited staff dormitory of Nanjing Meishan engineering as an example,and the inspection of on-site construction,material sampling and date measuring were carried out. The bearing capacities,overall seismic performance of brick masonry dormitory building were analyzed by using PKPM finite element software. The accurate reliability ratings according to results were pointed out.

Abstract:The static loads analysis of upper simply supported and the lower fixed double steel wall were carried out by using the finite element software ANSYS. The effect of the plate thickness,the thickness of concrete,cross-height ratio,the bolt spacing and other factors on ultimate bearing capacity were studied. Results indicated that appropriate thickness of the concrete slab can prevented effectively the lateral plate from buckling and had the beneficial effects on the ultimate strength of shear wall; Ultimate bearing capacity of steel plate increased with increasing of thickness and cross-height ratio but decreased with spaces increasing between bolt. It was significant to select the appropriate material thickness and dimensions for the application of the double steel plate shear walls.

Abstract:Through axial bearing capacity test of 4 CFDST hollow interlayer concrete columns in square steel tubes,their compressive mechanical properties,load-carrying capacity and flexural stiffness of concrete were studied. The destruction characteristics and the main form of damage of CFDST square hollow interlayer concrete filled steel tube column were analyzed. Research results showed that CFDST hollow interlayer concrete filled square steel tubes column can effectively improve the bearing capacity of axial compression column and column bending stiffness in this paper; Damage to the CFDST square hollow interlayer concrete filled steel tube column was pointed out. The calculation method of bearing capacity of concrete filled steel tubular axial compression column was determined and met with well experimental results.

Abstract:Based on adjusting the plane layout of shear wall with a frame-shear wall structure,the modal of each plane layout scheme was analyzed by using Sap2000 and the seismic action was calculated by using response spectrum method. The influence of plane layouts of shear wall on frame-shear wall structure seismic response was investigated. It was found that the seismic performance of the improved model was significantly improved,and the longer the distance of shear walls to the center of rigidity was,the better the torsional effect will be. The reasonable shear wall layout could effectively improve the seismic performance of a frame shear structure.

Abstract:In order to study the effect of shear wall on seismic performance of frame structure,using PKPM software in PMCAD module frame shear wall model,the general framework model is set up respectively,SATWE,etc in the module in the PKPM analysis of structure,module by means of comparison and analysis of data provided,exploring the structure of shear wall for "strong column weak beam"implementation effect. The results show that under the same seismic waves,frame shear wall structure of interlayer displacement Angle is less than the largest conventional frame structure; Structure of frame shear structure for the implementation of "strong column weak beam"effect is good in frame structure,showed good seismic performance.

Abstract:Using high-strength stirrups can form an effective constraint on high-strength concrete and greatly improve the deformation capacity,which above lay the foundation for high-strength longitudinal reinforcement used in the compressed member. This paper puts forward using high-strength steel bars( above 500 MPa) as longitudinal reinforcement of high-strength concrete column confined by high-strength stirrups. At first,the finite element model results were compared with the test results under the same parameters,and the accuracy of the model was verified. Then,the influence of the stirrup spacing and longitudinal reinforcement ratio on longitudinal reinforcement stress level and concrete strength were analyzed by using the finite element method. The results show that high-strength longitudinal reinforcement will play a good role in the member with reasonable stirrup spacing. Finally,the relationship between the strength of longitudinal reinforcement and bearing capacity of the member were discussed. The results provide a reference for theory research and application of high-strength longitudinal reinforcement used in confined concrete column.

Abstract:Being taken into account the nonlinearity of soil,the interaction of soil and shield tunnel, grouting pressure,jack thrust pressure and airlock earth pressure to establish a three dimensional nonlinear finite element model was established by using the finite element program Midas / GTS. The influence on the surface settlement of adjacent surface structures and shield tunneling was studied. The result shows that the maximum settlement value with structure is smaller than which without structure; the maximum settlement value is on the opposite direction of the structure,and deviates from the central axis of the shield; the closer to the lateral earth pressure at rest the shield support pressure is,the smaller the surface subsidence will be; reasonable control shield tunnel parameters( grouting pressure,jack thrust) can effectively reduce surface settlement.

Abstract:For the study on the bearing capacity test of bridge,the paper presents the study of the bridge test design and data analysis joining the project example in Beijing. The bridge load experiment detects and evalutes the bearing capacity,transverse joint perfomance,the local deformation,coping and abutment bearing capacity. The results shows that the various test indexes of the bridge are normal,the bridge situation could meet the requirement of the normal usage and safety transport. But considering that the local of the bridge has damge,some advice is given to repair the damge. The idea and methods of this paper can be used on the similar projects.

Abstract:This paper uses ABAQUS software to study the bending load capacity of simply supported RC beams strengthened with AFRP sheets and the comparative analysis is done between the experimental data and the simulation data in order to verify the correctness of the finite element model. In addition,based on the above correct finite element model,various parameters studies on the bending capacity of the second-load beams is in the further discussion. The simulation results show that there is a problem of reasonable distribution rate and optimal reinforcement length in the field of study on RC beams strengthened by FRP; In addition,a higher degree of pre-loaded stress influence the flexural behavior of RC beams greatly.

Abstract:Membrane effect can improve the cracking load and ultimate bearing capacity of the reinforced concrete floor,but there is no complete theory to calculate the influence degree of the membrane effect. In this paper,a multi-group model by the finite element analysis software ANSYS was built. Through contrast analysis,it was found that the membrane effect have a certain improvement on the cracking load and ultimate bearing capacity,the largest of cracking load increase factor can be up to 1. 27,the largest increasing factor of the ultimate bearing capacity can be up to 1. 69.

Abstract:Base on the project of foundation pit supporting system of south-to-north water transfer project in yellow,the paper made the analysis on the stress and displacement by means of theoretical arithmetic,numerical simulation and monitoring data. The conclusion is as follow: the stress of the diaphragm wall is given priority to with pressure,tensile stress and shear stress are very small,and stress level is far lower than the design value. And compare the results of theoretical value,simulate value and measured value. The theoretical value is larger than the simulate value and measured value,while the simulation results are similar to the measured value,but slightly lower than the measured values.

Abstract:Based on the soft soil foundation of Tianjin Binhai New Area,the change of pile group effect coefficient in different pile length,pile diameter,pile spacing and different number of pile were analyzed by using the finite element software MIDAS. The result shows that the pile group effect coefficient decreases as the increase of the pile length,pile diameter and pile number. The pile spacing has little effect on the pile group effect coefficient. The load ratio shared by the soil under the cushion cap increases as the pile spacing,the pile diameter decreases and as the pile length,pile number increases.

Abstract:Depending on high precision and feasibility,GPS is usually applied in slope stability analysis. Whereas,the coordinates measured by GPS need be transformed if they are applied in slope stability analysis. Considering impact of earthquake motion,the program basing on Swedish slice method was carried out by using Visual Basic 6. 0 programming. The calculation results were verified by practical program and the results showed that calculation results obtained by program proposed were feasible and coordinated well with results obtained by Swedish slice method.

Abstract:Rock slope stability analysis is a probabilistic problem. The equivalent linear parameters derived from the Hoek-Brown criterion and the jointly distributed random variables methods are used to determine the probability distribution of the safety factor. The program from the Matlab is provided to take place of the calculation. The result confirms the feasibility of the jointly distributed random variables method and shows that the safety factor approximately obeys the normal distribution. The jointly distributed random variables method can provide a rapid evaluation. Besides,the sensitivity analysis to the parameters shows that the more effective parameter is the horizontal seismic acceleration rather than the water depth of the tension crack.

Abstract:Combining with mine rock analysis report,we studied the molybdenum deposits of trace element of the molybdenum deposits systematically and compared the accumulation regularity of strata, mining quartz porphyry and white granite of trace elements comprehensively based on the previous prospecting material. The results showed that compared with the strata,content of Mo in igneous rocks was far higher than the crustal abundance. Quartz porphyry,in which the average content of Mo 26. 67 × 10^-6,and the concentration Clark value of 17. 78,was strongly enriched Mo,so we hold that the forming materials derived from magmatic rocks.

Abstract:The paper take the landslide in the left bank of a hydropower station in Southwest of China as the research object. A 3D numerical simulation model is developed to analyze the deformation features and stability of the accumulation body on the theory of The strength reduction method by FLAC3D. The research results show that the accumulation body is stable under natural conditions. The results are also consistent with the spot geological surveys which prove the appropriateness of parameters choosing and the reliability of 3D calculation model.

Abstract:Experiment analyses were carried out on dustfall samples which were collected from three sampling points in Fengfeng District according to the changes of seasons. The results showed that the distributions of n-alkanes in dustfall can be mainly divided into two types with the CPI values ranging from 1. 54 to 10. 54,including behind peak type and dual distribution type. Both of them take C29 as main carbon. N-alkanes in dustfall mainly come from fossil combustion such as coal when in winter but come from bio-organic matter like higher plant and pollen in the other seasons. Source of bio-organic matter are gradually reduced from spring to winter,while fossil combustion sources are increased.

Abstract:In order to accurately describe the rock fracture network flow field condition,the fracture of the intersection was taken as a node and the node between the fracture line was taken as line element by basing on the discontinuous fracture media seepage theory and fluid mechanics; the line element flow to the common node of each wire flow amount was equal to the change in storage. And then the seepage equations were established and the groundwater seepage flow model of fracture network flow media was built. And the simulation domain was calculated by using this method,and then the results with the classical numerical method were compared. The results show that the line element method model can accurately characterize the structural characteristics of fractured aqueous medium,and which is able to accurately reflect the actual groundwater flow direction.

Abstract:Based on acquiring the steady-state and dynamic data of grid,the simulation veracity in the case of uncertain load model parameters is analyzed in this paper,and in return the uncertain parameters are corrected using dynamic data of post-fault system. The genetic algorithm made some improvements is selected as correction algorithm. The load ratio is selected as inaccurate parameter in IEEE-39 system simulation,which can be extended to all model parameters of power system in actual application. Finally,the evaluation and improvement areas of this scheme are given.

Abstract:The relation between the porosity,nonuniformity coefficient,curvature coefficient and permeability coefficient was analyzed by changing the fine particle content. The relationship between the gravel soil permeability coefficient and porosity feature parameters was discussed. The gravel soil permeability coefficient and three pore characteristic parameters of multivariate regression model were established. Research results show that gravel soil coefficient of permeability and the three pore characteristic parameters is comprehensive,the individual parameters' influence on the permeability coefficient is random; 40% of the fine particle content can be used as the boundaries of the coefficient of permeability of sand gravel content,when the fine particle content higher than 40%,the permeability coefficient decreases smoothly along with the increase of fine particle content; When the fine particle content is less than 40%,the permeability coefficient decreases rapidly along with the increase of fine particle content. Only using the same skeleton structure characteristics of the soil could meet the consistency change law of permeability coefficient.

Abstract:Aiming at the shortcomings of small measurement range,low precision,wiring inconvenience of traditional mashgas detection instruments,a ZigBee mashgas detector based on Modbus Protocol was designed. This paper used AVR Atmega series microcontroller 169PA as the core controller, and used intelligent non-dispersive infrared mashgas sensor to form detection circuit,and used ZigBee remote transmission to communicate with the host computer to share information,multipoint measurement was realized by Modbus communication protocol. The conclusion proves that the design improves the measurement range of mashgas concentration and reduces waste and inconvenience brought by laying line,the results can form more large areas of detection,and has a high application value.

Abstract:The characteristics of NURBS curve interpolation were introduced. Because the derivation error and the computational complexity for complex curves with NURBS curve is large,so that NURBS curve interpolation will be optimized by the application of BP neural network. Then a example was used to demonstrate that the method could meet the required accuracy. The results showed that the interpolation rate was improved because the parameter u had been estimated before interpolation.

Abstract:Using Somat eDAQ data acquisition system acquired parts of load spectrum of a domestic car in Tong county proving ground and Xiangfan proving ground. The Ncode-GlyphyWorks software was applied for load spectrum data processing by according to statistics law,the time series were transformed into the rain flow matrix. The potential damage was showed in the form of percentage data in the form of data. The equivalent of two relations were gotten by Using road-related technologies and rain flow counting proving ground part of the road,which could provide evidence for automobile reliability test.

Abstract:By choosing a car white body as reference,the white body finite element model is established. Being based on torsion condition set constraints,white body weight was chosen as the objective function of the parts thickness as the design variables. The value of the sensitivity of various parts was calculated by using Nastran. The sensitivity value of the parts was evaluated by introducing a concept of average absolute sensitivity and the absolute sensitivity. The parts thickness thinning processing and validation were optimized by iterative calculation optimization solution. Finally the quality white body reduced at 3. 73% under the premise of no more than 5%.

Abstract:The dynamic model of a cavitation bubble in ultrasound field in liquid was established according to the analysis of thermodynamics and kinetics. The model equation was solved and the cavitation process was simulated,where the factors including the ultrasonic pressure amplitude,frequency,the initial bubble radius,the density of the liquid,the surface tension,dynamic viscosity were discussed.

Abstract:To research on the effects of specific factors affecting the flow of human capital,this article builds a regression equation with net flows of human capital as the dependent variable,professional levels of human capital,industrial agglomeration,urbanization rate and GDP per capita as four independent variables,and empirical tests of the effects of each factor on the current human capital flow in Hebei province. In the case of removal of multicollinearity and correction for heteroscedasticity,empirical results show that specialization human capital stock and urbanization rate have the negative effect on human capital flow in Hebei province,and the level of industry concentration has the positive effects on human capital flow in Hebei province,but its effect level is far behind other provinces and cities in the eastern region.