Abstract:The finite element analysis software (ANSYS) is used to carry out the modal analysis of the common brace and buckling restrained brace. The advantages and disadvantages of the two kinds of support modes are compared. On the basis of modal analysis, the buckling mode of the structure is analyzed. The critical load changes and instability position are also studied. The friction coefficient of the buckling restrained brace and the strength of the filled concrete are analyzed. The results show that the bending of the Y axis is easier to occur in one core, and the stiffness and the natural vibration period of the frame structure can be obviously changed by installing a steel shaped hybrid buckling brace.

Abstract:Taking an 8-story frame structure as an example, using etabs software, the vibration period, interlaminar shear and maximum displacement of different models such as rubber isolation system and sliding isolation system under the interaction between soil and structure can be obtained. the results show that the vibration period of different structures is prolonged, each layer displacement increases, and the sliding isolation system is significantly reduced compared with common structure and rubber isolation system, and the effect of sliding isolation system is better at the class iv site.

Abstract:Experimental study on the disintegration characteristics of sandstone and mudstone is investigated based on the diversion project of water from Yangtze to Huaihe River. The disintegration characteristics of soft rock with different weathering degree under drying and wetting cycles are studied by drying-immersion static rock slaking test. At the same time, the rock slake-durability tests and point load strength test are carried out to reveal the correlation law between disintegration and strength, the loss of moisture. The results show that the effect of drying and wetting cycles and weathering could weaken the rock slake-durability; and the rock slake-durability index increases approximately linear with the point load strength and decreases approximately linear with the loss of moisture of the rock. The slakedurability of rocks is related to rock structure types.

Abstract:Based on segment joint full-scale loading test of line 13 in Shanghai, the parameters of CDP model were calibrated and a 3-D damage-plastic FEM model for segment joint of shield tunneling was established combining the damage-plastic model for concrete in ABAQUS and the code for design of concrete structures. Under the interaction of moment and axial force, the whole damage and fracture process of concrete was studied. What's more, the relationship among moment, splaying amount, deflection and damage during four stages of the whole damage process was described in detail. The results show that the deflection-load curve is closely consistent with that of the test, and the segment joint of shield tunneling goes through four stages, which are global section compressed stage, small deformation stage, large deformation stage and joint contact-extrusion failure stage. Finally, based on the splaying amount, combining the deflection, moment, and the average value of tensile damage strip, the health evaluation index about the damage and failure of the segment joint was proposed.

Abstract:In this paper, on the basis of verifying the validity of the model, the abilities of collapse resistant, which are beam-column frame, beam-slab substructures without constraint, beam-slab substructures with three sides restrained, were compared through the finite element software to study collapse resistant mechanism of beam-slab substructures under penultimate-external column removal scenario. The research results indicate that when the progressive collapse occurs, catenary and membrane effect of rebar in slab can resist structure deformation, and improve the structure resistance force. Constrain of slab edge can greatly enhance the ability of collapse resistant, but the transverse beams may damage before the double-span beam. Therefore the ability of collapse resistant of transverse beams should be valued in collapse resistant design.

Abstract:The model of slope reinforced by roots is established and the numerical simulation is carried out by using the pullout resistance of different roots length according to the principle of the axial force and the shear resistance of the woody roots system to the slope. In the process of simulation, the effects of the roots length, roots density and rainfall conditions on the slope stability are studied. The results show that the roots of woody plants can improve the shear strength of soil, increase the stability of slope and make the slope more stable. Increasing the length and density of woody plants can make the safety factor of slope larger. The roots system can still increase the safety factor of slope, and has a certain reinforcement effect on the slope under rainfall conditions.

Abstract:The pseudo dynamic method is one of the most common methods to obtain the earth pressure under seismic conditions. However, this method often ignores the viscoelastic characteristics of the backfill medium and boundary condition with the zero stress on the free surface. In order to remedy the deficiency of the existing pseudo dynamic method, in this paper, the viscoelastic properties of seismic wave propagating medium are considered to improve original pseudo-dynamic methods; Then the calculation formula of the active earth pressure of the inclined retaining wall with overload angle and the fracture angle under the critical failure are derived, and the influences of overloading angle, seismic force coefficient and other parameters on the critical rupture angle and the coefficient of active earth pressure are analyzed. The results show that the critical rupture angle increases with the increase of vertical seismic force coefficient; the horizontal earthquake force coefficient, overloading angle, internal friction angle and retaining wall inclination have great influence on the design of retaining wall.

Abstract:According to the characteristics of the expansive soil which are the expansion of soil meets water and shrinkage of soil loses water, the strength change law of shell modified expansive soil was studied by crushing the shells and adding them to the swelling soil through the scientific indoor shear strength test. The test results show that adding shells can effectively improve the shear strength of expansive soil. With the increase of the shell content, the shear strength increases first and then decreases, and the shear strength of the improved soil reaches the maximum when the amount of the shells is 12%.

Abstract:In order to explore the effect of gradation on the angle of repose of coarse grain soil, gradation parameters d_max,c_u and c_c are calculated for different graded soils, the angle of repose of each gradation soil material is tested by experiment, the influence of gradation parameters on the angle of repose is studied. The results show:with the increase of d max,c_u and c_c, the angle of repose increases. On the basis of this, a method of normalizing the angle of repose and gradation is proposed, the relationship between the angle of repose and the gradation parameters d_max,c_u and c_c is found. The rationality of the formula is verified by laboratory experiments.

Abstract:It is difficult to ensure the smooth start and reception of shields. After the analysis of the geological conditions, compaction grouting combined with reinforcement technology are used to reinforce sand layer. A very good water-stop effect is achieved in the water-rich soft soil layer. From the late core verification, one knows that reinforcement effect is good. It can ensure the stability of the soil and the smooth reception of shield machine.

Abstract:By using the sedimentation column test, the flocculation sedimentation law of the hydraulicdredged slurry is investigated with the case of Dongtou of Wenzhou. The results show that the addition of CPAM can increase the settling rate of slurry, improve the separation rate of slurry, and make the overlying water clear, which can increase the density of sedimentary soil in some extent, and reduce the void ratio of sedimentary soil; At the same time, according to the flocculation sedimentation law of hydraulic-dredged slurry, the flocculation sedimentation model of CPAM as flocculant to treat the dredger filled slurry is put forward, which is divided into four stages of flocculation sedimentation, rapid settling, slow settling and stabilization.

Abstract:Taking equal volume replacement ratio of waste brick coarse aggregate as variable, the paper, based on discussing the influence of the waste brick coarse aggregate on the compressive strength of recycled concrete by replacing waste concrete coarse aggregate on equal volume, explores emphatically the impact of the volume replacement ratio of waste brick coarse aggregate to the shrinkage and deformation of recycled concrete. The results show that the volume replacement rate is 25%, water treatment and pre wrapped treatment can most effectively reduce the shrinkage deformation of recycled concrete, and the compressive strength of recycled concrete is not reduced obviously. When the volume replacement ratio is 25%, the shrinkage resistance of recycled concrete is better than that of wrapping treatment, and the compressive strength of wrapped slurry processing recycled concrete is higher than that of pre absorption treatment.

Abstract:Taking a hydropower station in the upper reaches of Lancang River as an example, the detailed survey, statistics and analysis of the exploration Adit in the area are carried out, and the location, lithology, occurrence, structure and characteristics of the toppling deformation body are analyzed in detail. It is found that the toppling deformation of the reservoir bank is serious. With the passage of time, the dumping rock experience further deformation under the internal and external force. It seriously restricts the construction of hydropower station. The deformation of the correct methods of evaluation is of great significance to the safety of the bank. With the help of UDEC software, the maximum horizontal displacement, the deformation area and the total displacement are used to evaluate the toppling deformation. It is concluded that the method of evaluating the deformation of rock mass with total displacement is more accurate.

Abstract:Based on measured data of the Sutong Bridge's north main pier during operation period, the paper analyzest the axial force of pile body, and then evaluates the effect of bearing capacity of the pile group foundation on the riverbed protective layer. According to the monitoring data, both the axial force and its amplitude of variation weaken sharply after piles pass through the riverbed protective layer. It shows that the riverbed protective layer used by the Sutong Bridge is of great significance in improving bearing capacity and global stability of pile group foundation, controlling settlement and improving force transfer mechanism.

Abstract:In order to investigate the influences of air saturability on the heat transfer effect, this paper uses the numerical simulation method to calculate the effect on total heat exchange, entransy dissipation, entransy dissipation thermal resistance and heat exchange efficiency when air changes delay isotherm, isenthalpic and isobume near the saturation line. It is found that when the gas changes along the three lines approach to the saturation line, the thermal dissipation of the entransy dissipation always decreases, and the total heat exchange efficiency increases.

Abstract:By investigating the visitors flow rate of two shopping malls in Handan with the black box theory, there is the explanation of rules of personnel movement in two shopping malls, the calculation model of personnel density in shopping malls has been built via the correlative knowledge of applied mathematical statistics. Combined with the survey data of the two shopping malls, the personnel densities, the laws of personnel density distribution at different times of the day, as well as the ratio of average personnel density on working day and rest day are obtained. By calculating the air conditioning cooling load of two shopping malls in Handan and analyzing the characteristics of cooling load of two shopping malls, optimizing suggestions of air conditioning system are put forward to reduce air conditioning load according to the different cooling load characters. We suggest that the air conditioning system of two shopping malls should be optimized by improving outdoor air quality and improving the utilization rate of outdoor air.

Abstract:By studying structure characteristics and sedimentary filling sequences, this paper discusses the Jurassic tectonic and sedimentary evolution process the study area, provides the basis for exploration and exploitation of coal resources in Muli Coal field. The result shows that:there are two groups of faults in the research area, which are NW-NWW thrust fault and NE-SW right lateral strike slip fault. NWW-NW fault formed in the late of Yanshan period isdeveloped. NE-SW right lateral strike slip fault is later and it is the outcome of Himalaya. Fold morphology is linear folds and thick folds, which is the results of Himalaya. Fault-fold constitutes a one-way thrust type compound syncline, one-way thrust type compound anticline, hedge type compound syncline. Delta facies, meandering river facies and lake facies are the main sedimentary facies in Jurassic of Muli Coal field.The coalfield went through of rift sedimentary period (Jurassic), the period of uplift and denudation stage (cretaceous and the Oligocene), wide basin sedimentary period (Miocene), and the period of Fold-thrust

Abstract:Based on the 2014 SPOT5 remote sensing data, the kernel density estimation and hot spot identification are used to analyze the distribution and changes of rural settlements spatial pattern in Shexian County in 2014.The results show that the plots of the settlements in the county of Shexian show the distribution of the density of the "North close south sparse, west close east sparse, Qingzhang River Basin closer, the greater the density from the county", The northwest is the core of the rural settlement. Some special cases have also been found, such as the low density of population in high altitude areas, but the density of rural settlements is relatively high, the population density is low in the low altitude areas, but the density of rural settlements is relatively low.

Abstract:Based on the changes of land use and the value of ecosystem services, in this study we selecte Wuxi City, Jiangsu Province as the research area, and explore the change of land use status and ecosystem service value in Wuxi from 2000 to 2014. The assessment of the development for Wuxi City and the analysis of future development are carried out. The actual results show that most of the land in Wuxi is transformed from other land types to construction land. In the three types of land use types, such as waters, cultivated land and forest land, there is only a slight increase in forest land. Construction land is the largest change and the fastest type in the type of land use. it reverls the process of urbanization in Wuxi in the 14 years of rapid development. In terms of the value of ecosystem services, the value of ecosystem services in Wuxi increases year by year, but the overall change is not significant.

Abstract:The microscopic structures of five iron-carbon alloys (including hot rolled 37Mn5, mediumtemperature tempered 65Mn, as-cast QT400-18L, hot rolled P92 and annealed 20 steel) and one titanium alloy (quenched after hot forging) were investigated by using the color metallographic technology and "black and white contrast" metallography. It was shown that the "black and white contrast" metallography could only be used to observe the microstructure of conventional carbon steel and low alloy steel. Three color metallographic methods which were easily operated can be used to observe the ferrite grains in QT400-18L. Heat dyeing can be used to observe the metallurgical structures of carbon steel and low alloy steel in industrial mass production.

Abstract:In this paper, the DEFORM simulation software is used to simulate the cutting process of AIGI52100 hardened steel with high speed and hard turning of diamond tools. The influence of cutting speed, feed rate and cutting depth on cutting force is studied by orthogonal simulation experiment. The optimal processing parameters combination in the experimental range is given. When the cutting speed is 120m/min, feed is 0.10m/min and cutting depth is 0.10mm, the minimum cutting force is obtained. The empirical model of cutting force is established by using regression analysis method., It is shown that the empirical formula is reliable by taking significance test.

Abstract:In this paper, GT-COOL software is applied to build one dimension model of a certain type of engine cooling system. The temperature of import and export, import and export pressure in engine extreme working conditions are analyzed. Compared the simulation results, the simulation results show that the design of the radiator performance can meet the requirements of the vehicle cooling performance.

Abstract:Fthe Tiantong mobile satellite communication, we propose a turbo equalization to remove ISI. However, the Log-MAP algorithm is sensitive to SNR estimation. Aiming at this problem, we propose a method of SNR estimation based on Chirp signal in FCCH of Tiantong system to ensure the performance of turbo equalizer. The simulation results show:SNR estimation error range of 0.2 dB can be ensured and BER can reach 10^-3 under condition of 3 dB Eb/N0.

Abstract:This paper characterizes the hypercyclicity of weighted composition operators on the H_v⁰ space. The sufficient condition of hypercyclicity of weighted composition operators is presented, when φ is an automorphism or a hyperbolic non-automorphisms. The examples showing the fact that weighted composition operators uC_φ on the H_v⁰ space are non-hypercyclic are also given, when φ is parabolic nonautomorphisms.