Abstract:The currently study on two-tower structure with enlarged base only focused on the seismic behavior and the consideration of the temperature stress was rarely taken into account. To address the above problem, the seismic behavior of structure under the combined effect of temperature and seismic action was discussed under response spectrum analysis by using the finite element analysis software SAP2000. It can be concluded that the temperature effect on the seismic performance is not huge, but it causes stress concentration in the local components of twin-towers structure, and the distribution of internal forces are changed; shear capacity of the wall are weakened, resulting in the bigger seismic shear force on the bottom column of frame, it should be pay more attention in the seismic design.

Abstract:The deformation rule of retaining structure was analyzed by according to the field monitoring data. Numerical simulation calculations were carried out by using finite element analysis software being PLAXIS and the numerical simulation results were compared with actual monitoring date. The results showed that moment of underground continuous wall obtained from finite element model met with actual situation. The deep horizontal displacement curve appeared as parabola being middle part and small at two ends. The maximum displacement located nearby excavation face and the increased with the increase of excavation depth. The transverse brace could effectively decrease the moment of underground continuous wall. The effect of concrete support was more obvious. The tensile region of underground continuous wall was affected mainly by excavation depth and less support structure.

Abstract:For the damage situation of reinforced concrete high bridge piers' performance in corrosive environmental effects, a systematic evaluation system was established which can reflect corrosion damage condition of reinforced concrete high bridge piers, and fuzzy comprehensive evaluation model of the reinforced concrete high bridge piers' corrosion damage condition was established based on each index weighting factor analyzed by the way of Analytic Hierarchy Process (AHP). With the aid of field test data of a existing high bridge pier in corrosive environment and based on fuzzy comprehensive evaluation model, fuzzy comprehensive evaluation was made to the existing high bridge piers' performance. The case evaluation of overall quality is "slight damage". The project example shows that fuzzy evaluation is significance for project, as a way to evaluate corrosion damage situation of reinforced concrete high bridge piers' performance.

Abstract:Based on the engineering example of Nanjing city gate of Wuding subway foundation pit, the paper uses the finite element analysis software PLAXIS to simulate the design parameters of underground continuous wall. The influences of the different factors on underground continuous wall were discussed. The support design method was optimized by according to the comparison results. The results show that increasing the stiffness of diaphragm wall can effectively reduce the lateral displacement of underground continuous wall; if the depth of underground continuous wall meet with the minimum depth, then increasing the depth is of little significance; the concrete support replace steel support, which could increase the support stiffness, reduce the horizontal spacing and adding a layer of support along the vertical direction when it is necessary, which has good effect on reducing the deformation of diaphragm wall; At the same time, the soil reinforcement to the weak soil around pit surrounding and structure risk areas has a very good effect to control the deformation of foundation.

Abstract:Based protection scheme of longitudinal impact of the excavation on the adjacent tunnel in soft soil,the influence of foundation pit excavation beng adjacent to tunnel on longitudinal displacement and moment was systematically analyzed by using ABAQUS.Three shaft stirring pile was taken as protection scheme sensitivity by making comparisons between strength and depth of reinforcement. After comparison, it is found that the longitudinal displacement decreased obviously with increasing of reinforcement intension, and restriction effect decreased obviously when the longitudinal displacement reached certain value. The increase of reinforcement intension had little weaker effect on the longitudinal section monment. The reinforcement depth had obvious effect on the distortion of tunnel, but the big reinforcement depth was not optimal. The diaphragm wall and the passive soil reinforcement had blocking effect on the displacement caused by foundation pit excavation being adjacent to tunnel.In this study, the optimal reinforcement intension was 200 MPa and the reinforcement depth was 6 m, which can have good effect on the tunnel distortion and reach the good economical benefit.

Abstract:For discussing whether current rules about displacement of maglev guideway under temperature load are too strict to realize, three different-depth-of-section double spans guideways model are established. Distribution of temperature and vertical and horizontal displacement of model in three different ambient temperatures are solved by using thermal-structure coupling analysis of ANSYS. The results show that the vertical displacement of guide way does not satisfy the latest standards and the horizontal displacement can satisfy the latest standards.

Abstract:In order to study the mechanical performance of semi-rigid angle connections of H-beams with corrugated webs, semi-rigid angle connections were simulated under the static loading with the finite element software ANSYS. With different angle thickness and different height of the H-beams with corrugated web, we can obtain the moment-rotation curve and stress cloud pictures, then analyze the influence of the angle thickness and the height of the H-beams with corrugated web to the behaviors of the connections. Results show that increasing the thickness of the angle, the initial rotational stiffness and bending capacity of connections have a growing trend, but the growth rate decreases, When the thickness of the angle increases to a certain extent, the influence is little; Increasing the thickness of the angle, the ductility of the connection will reduce; Increase of beam section height can effectively improve the connection initial rotational stiffness and bending capacity.

Abstract:Considering the different displacement boundary condition, the model of 2D-FGM plate with temperature independency of material properties was established, and the cooling transient thermal stress field distribution pictures were obtained with the finite element method. Effects on the transient thermal tress of 2D-FGM plate with temperature independency of material properties of during cooling process that the displacement boundary condition made were influential enormously. The thermal stress σx of on the free boundary of the 2D-FGM plate under simple supported and under one end clamped is zero; The thermal stresses accumulation were formed on the middle and lower of the two left and right boundaries of the 2D-FGM plate under two ends clamped, at the same time the shape and values of the thermal stress changed tremendously; To the 2D-FGM plate under clamped all around, the growth rate of the thermal stresses was more obvious than that of the 2D-FGM plate under two ends clamped. The results of this paper provide the foundations of theory calculation for the design and fabrication of the material.

Abstract:Mechanical model of finite element of rubber isolation and reticulated shell is established, vibration response of single-layer cylindrical reticulated shell structure installed the rubber isolation bearing under earthquake is investigated by numerical method. The results show that isolation bearing can play a good control effect on vibration of the structure, however, seismic intensity can influence the energy dissipation capacity of isolation bearing, energy dissipation ability increases with the increase of the earthquake intensity in maximum range, under the effect of different seismic wave, the vibration control effect of the isolation structure is different; in addition, the vibration control effect of the isolation structure is the best under the seismic wave of EI Centro.

Abstract:In this paper, the Youth Olympic Games in Nanjing underground traffic engineering tunnel axis of the main excavation pit asymmetric horizontal displacement monitoring data were taken as the basis for horizontal displacement monitoring. The numerical values of the ABAQUS simulation values were analyzed. It was concluded that Wall horizontal displacement occurs firstly at the top of the wall outward displacement of the cantilever excavation triangular distribution, and with the support of the erection, wall rotation occurs. The numerical simulations meet with actual monitored values; the pressure in the soil near the excavation face increases with increasing height of the wall. Above supporting section, the analog value is less than the calculated value; and in the following part of the excavation face, the analog value is greater than the calculated value; with the increasing depth of the excavation boom segment, the largest segment cantilever earth pressure is gradually increased, wall subsoil pressure value decreases.

Abstract:This paper relies on the continuous rigid frame bridge naming Laowo Bridge whose roof beams and plate beams are concurrence. The sequence of prestress drawing effect including batch and synchronization on prestress loss were analyzed by using Midas/civil finite element software through selecting typical conditions. The results show that the loss of drawing roof beams first is small than drawing plate beams. In the actual engineering, we can choose the right sequence of prestress drawing according to the scene.

Abstract:Combining with the new east coastal city of Shaoxing road soft ground treatment works, the in-situ experiment of dynamic consolidation method combined with vacuum well point dewatering is carried out. Construction settlement, underground water level and excess pore water pressure are measured and analyzed in the experiment, and conduct static cone penetration and bearing capacity are tested after reinforcement. The results showed: High Vacuum Densification method can effectively reinforce deep saturated silt subgrade, can accelerate the dissipation of pore water pressure, shorten the construction period; and significantly improve the value and bearing capacity of foundation soil reinforcement after the effective reinforcement depth of 8m, treatment effect to meet the design requirements, which has a certain reference value for similar reinforcement deep saturated silt roadbed coastal areas.

Abstract:Four commonly used standards including American, British, Russian and Chinese standards for measuring the body and edge strength of glass are documented. The difference of testing sample and loading condition in each country shows that the cost of Russian testing sample is the lowest and the testing condition is feasible; and the Chinese standards for glass testing is the lowest. And Chinese glass standards and its design practice in the glass industry should be improved in the future.

Abstract:The core wall material of gravelly soil of Nuozhadu earth rock dam under different degree of saturation conditions triaxial undrained shear test was carried out to research the stress-strain behavior of unsaturated gravelly soil. Analysis of the experimental curves shows that the deformation modulus of specimen decreases when water content increases under the same confining pressure; the strength of gravelly soil decreases when water content increases; cohesion and internal friction angle of specimen decreases linearly with increasing water content, and the value of cohesion decreases more obvious than the value of the internal friction angle.

Abstract:In order to overcome its defects of insufficient depth and dewatering long time, combining the soft foundation treating engineering of Yangzhong Haogang all-purpose wharf, the traditional dewatering-dynamic compaction is improved, in which moisture separator integrated wells dewatering-dynamic compaction is used to consolidate the soft foundation. Field monitoring and testing are carried out in two experimental sites, respectively the conventional vacuum wells dewatering-dynamic compaction, and another treated with the improved dewatering-dynamic compaction. The results show that dewatering depth of the improved dewatering-dynamic compaction could reach 5-6m below the surface, and the dissipating time of the pore water pressure after tamping is 1 to 2 days; the maximum settlement of the surface during the construction after the foundation consolidation is 0.606 m, thus the post-construction settlement is effectively reduced; compared to the conventional vacuum wells dewatering-dynamic compaction, both the soil strength and bearing capacity of the foundation have substantially improved. Thus it can be seen, the effect of the foundation consolidation is notable.

Abstract:To realize the energy-saving retrofit of low temperature economizers in the electrostatic precipitator area, the flow field in flue of the system was simulated by FLUENT 6.3. The results indicate that the flow field before precipitator appears extremely nonuniform, there are obvious high speed area and vortexes area in the deflection of the flue, the local maximum speed is up to 32m/s., the flow field is uneven in the both of the low temperature economizers after they are installed, and the maximum velocity deviation reaches 79.3%, which influences the heat transfer effect in the low temperature economizers greatly. There happens abrasion and scour in the low temperature economizers' pipes, which would endanger the safety of low temperature economizers. There appears large area at low velocity in the precipitator inlet, therefore the flow field is inordinate in the precipitator area, the precipitator power consumption is high and the collection efficiency is low. Optimizing the flow field and eliminating the vortexes can solve the precipitator efficiency problem. The results can provide reference for the engineering reform.

Abstract:Combined with the characteristic of rural residential building in north China, the energy consumption of a typical design of a building was simulated by the software DeST to gain different types of building's annual energy consumption of air conditioning, annual heating energy consumption and the annual total energy consumption of air conditioning and heating. Then, this paper research the changing regulation of them under the influence of window-wall ratio with different orientations, different material the window, whether shading. The results show that the total energy consumption index showed a trend of growth with increase of window-wall ratio in east, west, north. and could try to reduce window-wall ratio; The total energy consumption index is on the decline with increase of window-wall ratio in south; shading on outside the window and using the window which heat transfer performance is good can reduce influence of the window-wall ratio on the whole year energy consumption. so can appropriately increase the window -wall ratio on south of building.

Abstract:In simulation or evaluation of composite systems, the choice and quantification of indexes are key contents. A new evaluation model was put forward to quantify the indexes weights of Eco-water network composite system by uniting AHP and entropy value method,the model avoided the subjective in using analytic hierarchy process (AHP) and partial in using entropy value method separately. That is the indexes weights were calculated by AHP and entropy value method respectively firstly, and then the weights were determined by according to comprehensive function. The alliance of AHP and entropy value method can be regarded as the combination of subjective and objective method. It reduced the error rate and false reject rate in the process of data classification and identification, compared with using AHP and entropy value method individually, the alliance method makes the results more objective and reasonable in the index quantification of Eco-water network composite system. Based on the ecology, water network data from 2008 to 2012 in Hebei province, the two sub-systems including ecology and water network system were analyzed, and the ten indexes weights of the composite system were calculated. It lays the foundation for coupling simulation, evaluation and management of the composite system.

Abstract:OpenMP(Open Multi-Processing)can achieve an ideal parallel performance on shared storage system. MPI+OpenMP hybrid parallel programming model is closer to the architecture of multi-core clusters. The hybrid model on the multi-core cluster was executed. The test results showed that the hybrid parallel programming model could reduce 95% of the run time of the serial program. And its parallel speed-up ratio was more than 20. This paper shows the hybrid parallel model is an improvement of the pure MPI parallel system with better speed-up ratio and scalability.

Abstract:Aimed at the improvement of data transmission reliability in wireless sensor networks(WSNs), a cooperative communication based clustering routing algorithm is proposed in this paper. This algorithm includes three phases of clustering, routing between clusters and routing in cluster, which are able to determine the optimal data path to satisfy the data transmission reliability based on the radio of signal and noise, and then realize the cooperative communication between source node and destination node. The simulation results show that the cooperative communication based clustering algorithm in WSNs can effectively optimize the data path in network, and improve the efficiency of frequency spectrums, and then enhance the reliability of data transmission.

Abstract:In this paper,a low-alloy structural steel Cr-Mo system has been studied. Completely quenching process was performed on a novel steel for perforated gun tube and the influences of the quenching temperature, holding time and tempering temperature on the microstructure and properties of the experimental steel had been investigated. The results show that, the grain of the experimental steels became larger with the increase of the quenching temperature. The hardness of the quenched steel increased firstly and then decreased with the increase of quenching temperature.At the same quenching temperature, hardness and grain size changed little, with the holding time extending.With the increase of the tempering temperature,the hardness and strength of the steel quenched at the same temperature decreased,but shrinkage of section and the impact energy increased. When the quenching temperature was 900℃,holding 40min and tempering temperature was 560℃,holding 80min,the steel achieved a yield strength of 927MPa that was higher than 130ksi.Its hardness was HRC31.2,while its vertical and horizontal impact energies reached 74.5J and 119.7J.Thus,the overall performance is the best.

Abstract:In reality, a kind of allied m-sequence with finite series can be obtained by the way of state splicing. On the basis of this, we can prove the existence of this allied m-sequence when the series are any numbers by the way of mathematics: That is to separate the state of m-sequence shift register and the effective feedback bits based on the odd and even numbers, and study their influence on feedbacks respectively. On the basis of theory, we can get a finding that when series are any numbers, relative conjugate states have the condition to form an allied m-sequence. By analysis and tests, allied m-sequence, we get has a perfect pseudo random character.

Abstract:Comprehensively considering such problems that the highly cost to guide the whole journey with icons, the partly guidance is not clearly expressed and the twice car navigational tracking is hardly to achieve, the program which transmit data to mobile equipment via the Internet of things to realize the whole navigation is designed. The system includes hardware, software, collects parking data for PC and uses Base Station number segment identification technology transmitting the data to drivers' phone, so the driver can do the whole navigation in the parking lot and take his car when they are back with the data. According to the hardware, software and debug experiment, data can be sent to drivers' phone reliably and the driver can link to Baidu map with the data to achieve location, navigation and twice car navigational tracking in the parking lot easier. This system can be embedded into every parking lot system in any city easily. So it has wide application potential.

Abstract:According to the actual circumstance of XingDong mine, the analysis of hidden disaster-causing factors incluing mined-out areas, geological structures, hydrogeological conditions and gas enrichment zones, and assessment of impact on mining are conducted. Moreover, lots of practical comprehensive treatment measures are drawn up by according to the effect degree of different hidden disaster-causing on safety production, which could maximize the elimination effect of hidden disaster-causing factors to mining safety and improve the ability of safety ensurance.

Abstract:For different analysts or different laboratories using the same analytic methods, or a analyst from same laboratory using a variety of different principles of analytic methods, the method of hypothesis testing can be applied to quantitative analysis, to assess whether there are essentially differences in their experimental process. Research methods adopt normal P-P diagram, Kolmogorov-Smirnov one-sample test method, two independent samples Mann-Whitney test method, Runs test method. The initial tensile strength data from longitude direction and latitude direction of Alkali-resistant glass fiber mesh will be collected by experiment. The research results show that the quantitative analysis of experimental data through multi-angle can be used to evaluate whether the experimental operation have a significant difference on the experimental results. Thus laboratory management can be promoted through quantitative analysis of experimental data.

Abstract:Focusing on the current situation of security risk management in building construction project, security risk evaluation indexes system is established through comprehensive consider six major factors as follow personnel, materials, mechanical equipment, environment and management. The weight of each index can be gotten by information entropy, applying extension theory to evaluate risk and the level of risk in building construction project is obtained. Finally, an example is provided to verify reliability of the method, giving some reference for security risk evaluation of building construction project.

Abstract:Focusing on the nature of complexity and uncertainty of coal enterprise's employee turnover risk, the combination weight and unascertained measurement(UM) estimation model are established. On the basis of using AHM-entropy to determine the weight of risk factor, the method of unascertained measurement is applied to analyze different forms of human resource in coal enterprise, each risk level is obtained. Finally, the estimation approach is validated by an example, also providing the suggestions to enterprise's risk management.