Abstract:The value of the cable initial pre-stress has effect on the working performance of beam string structure(BSS).Theoretic and finite element methods were both used to analyze the inner force and deformation of BSS.It proved that finite element method which is accomplished by SAP2000 accorded with the theoretic one,thus SAP2000 were used to study the influence of initial pre-stress on mechanical performance.The result shows that rational value of the cable initial pre-stress can improve the internal force distribution of the structure,but do less influence on the vertical flexibility and support displacement.

Abstract:It presented a kind of nets forms,whose top boom was replaced by concrete slab and the bottom chord bar was replaced by pre-stressed cables.Structure model was framed and the structure's static characteristics were analyzed with ANSYS finite element software.When model was found,the structure was dispersed with slab elements,beam elements,pole elements and cable elements.And these elements interconnected with nodes while framing structure model.The conclusion is that the node displacement reaches the largest value in the center of the structure.And the node position is farther away from the center,the less of the node displacements.Also some plate elements have tension and others have pressure,so as the belly bars.The tension and pressure elements' positions are alternative.When the structure is forced by pre-stress and external load,the cables have tension.

Abstract:An attempt has been made to investigate the deformation ductility of RC shear walls under cyclic loading.A calculation method for the deformation ductility ratio of shear walls is established with consideration of the confinement of boundary zones at both ends.The influence of axial compression ratio,shear-span ratio and the characteristic value of stirrup in confined boundary zone on the ductility of the walls are studied.The experimental results of 39 RC shear walls subjected to horizontal cyclic loading with different axial compression ratio are employed to verify the proposed calculation method.Using the established method,factors influencing the deformation ductility of shear walls are studied.It is concluded that to make the shear walls have expected ductility,the axial compression ratio should be limited and the confined boundary zones must be provided.

Abstract:By use of SAP2000,five kinds of chessboard-shaped pyramid space grid which span in 64～96 meters were made as examples for modeling,which were compared with the mechanical properties.The results show that the natural vibration period is related to span and load rating of the space grid.The internal force distribution regulation under the combination of static load and vertical earthquake were also decrypted that the tension of upper chord was transited to the central pressure from surrounding;the maximum internal force of bottom chord occurred in the one force plane central;and the maximum internal forces of belly bars occurred in the surrounding pyramids,which was available for design and engineering project.

Abstract:Steel-concrete composite beams are widely applied in bridge structures.The problem of fatigue damage caused by vehicle loads is becoming more and more serious.While research on fatigue performance of composite beams is insufficient in our country and the fatigue design guidelines in current codes are incomplete.At present,the fatigue performance of composite beams are mainly studied based on experimental programs.However,the characteristics of consuming time and high cost of fatigue tests make it difficult to conduct a lot of research.Therefore,it is greatly significant to summarize and analyze the existing research results.This paper investigated the fatigue performance,methods for fatigue design of composite beams on basis of the research literatures and design codes all over the world.The presented studies involved in this paper could provide some reference for the fatigue design.

Abstract:According to the specific parameters of a scaffold design drawings,a theoretical calculation model with three spans and six steps is built by using ANSYS software.Then a load of 200kN is applied to the whole model and the stability is calculated.The result is compared with the true type test.By expanding the model,the stability of the scaffolds with height being 30m and 45m is calculated.Thus a feasible method of using ANSYS software to analyze the overall stability of scaffold is proposed.

Abstract:With the development of the high composite structure,the composite joint comes to be a hot spot.Based on an experiment of a composite joint between steel tube column and steel rein-forced concrete beam,it is analyzed through finite element software ANSYS.The influence of configurations,such as the thickness and the amount of steel reinforcement,to the bearing capacity of the composite joint are analyzed.It can be concluded that the result of numerical simulation is comparatively correct.

Abstract:According to the analysis of chemical composition and stability of the desulfuration residue from a power plant of Handan,the impact of the desulfuration residue content on the product performance was discussed.The desulfuration residue was used to replace the gypsum and part of fly ash for preparation of aerated concrete.The result indicated that the dry bulk density and intensity of aerated concrete block meet the requirements when the desulfuration residue content is 10%,which could keep down the congeal speed,prolong the congeal procession and keep the stoma;however,if the desulfuration residue content 15%,the product would crack as the result of the its lower activity,and the retarding effort would be bad when the gypsum is replaced by the desulfuration residue only.

Abstract:In this paper,the finite difference strength reduction criteria was used to determine slope failure analysis.Taking the high rock slope in the head of dam for the example,Flac3D was used to analysis the high slope stability before and after water based on the basis of Survey.The safety coefficient was solved by using the strength reducing method.The results showed that the high slope is stability and finite difference strength reduction can resolve quantitative rock slope stability problems.

Abstract:Sliding friction comes into existence between soil and the surface of jaked pile during the process of penetrating.Based on the laboratory test the sliding friction and its time effect between jacked pile and soil in Tianjin Binhai New Area are studied with the improved direct shear apparatus.Angle of external friction and its law between jacked pile and soil are obtained.And the mechanism of time effect is also summarized.The results show that friction resistance is related with soil type,and is approximately linear to the vertical pressure.The increase of friction resistance between pile and clay or mud silt is proportional to the increase of carrying capacity of the pile with the time going by.It has some reference significance for the research on soil compaction effect and carrying capacity of the jacked pile in Tianjin Binhai New Area.

Abstract:Aimming to the flexural slumping of the soft rock in the red beds area along the expressway Changde to Jishou,the failure model of this kind of fracture was analyzed.The causes of landslide and instability mechanism of the flexural slumping occurred in the soft rock slope were explored.

Abstract:Basing research on the on-the-spot investigation of various incubators in many university knowledge parks in China,the author studies their space pattern of incubator architecture system for providing theoretical references for the design of the promising incubators.

Abstract:The poly aluminum chloride(PAC),aluminum sulfate(Al₂(SO₄)3.18H₂O),ferrous sulfate(FeSO₄.7H₂O) and ferric chloride(FeCl₃.6H₂O) were chosen as coagulants,the phosphorus removal effect for municipal wastewater by beaker test were carried out.The removal of suspended solids(SS) and chemical oxygen demand(COD_Cr) were also compared.The results show that,when the dosage was 80mg/L,the removal of TP by four kinds of coagulants from high to low was FeCl₃.6H₂O>Al₂(SO₄)3.18H₂O>FeSO₄.7H₂O>PAC;the removal of TP,SS and COD_Cr were increased with coagulant dosage.

Abstract:SBR process is studied to treat papermaking wastewater.The effect of pH,aeration time and concentration is investigated.The test results show that pH is 6.5～7.5,aeration time is 6 h,concentration is 912 mg/L,the removal rate of COD is 83.1%.Effluent quality meets the state's paper industry effluent discharge standards.

Abstract:A ground thermal response testing system is developed independently on the principle of constant heating flux.Through the method of field testing,it's summed up that the relationship during the power of heating,flow rate of circulating water in the pipe and import and export water temperature of buried pipe.The thermal properties of soil are determined by the line source model.The results show that it is very important to improve the thermal conductivity for its original temperature.The thermal conductivity of the soil tends to be constant after 50 hours and converges to 3.109 W/(m·℃) under the condition of the undisturbed soil temperature and a given PE pipe.The soil thermal conductivity at the average of 3.489 W/(m·℃).It is provided for ground source heat pump system for theoretical basis.

Abstract:The authors have established a mathematic model of the modular floor radiant heating system and carried out a numerical simulation.The floor surface temperature distribution and heating space temperature distribution were tested by experiment.The simulation results are consistent with the experimental results.It shows that new type of new heating system is more convenient to install and is able to be effectively reduce the building load.

Abstract:Fifteen summer soybean varieties with relative higher and lower yields in mid-south of Hebei province were used for researching on root traits by pot experiment.At 41,65 days after seeding,the root morphological and physiological traits were determined during two years and two location respectively.The RIL population derived from Kefeng 1×Nannong 1138-2 was used to mapping the QTLs of root trait related to yield.Results showed that the increment of root-active-morphological traits(IRRAMT),namely,increment of the products of root reductive activities and root fresh weights,root total lengths,root volumes,respectively,were significant different between two yield types.The IRRAMT could be used for the index of yield.There identified were fore,three,three QTLs located on N6-C2,N20M,N18-K,N14G、N3B1 linkage groups for IRRAW,IRRAL,IRRAV respectively.Each of the traits appeared to have one locus with relatively large effect in comparison with their other loci,and those major ones were located at a same linkage group N6-C2.

Abstract:Polycyclic aromatic sulfur compounds(PASCs) in Permian Kupferschiefer might form in different diagenetic stages by different mechanisms.A part of them might form in earlier diagenetic stage,and another part might form in later diagenetic stage.The contents of PASCs are influenced not only by depositional environment and the maturity of the organic matter,but also by base metal content.R_o of highly mature samples from the Oberkatz lithologic section reaches 1.3 %,the PASC contents are lower than 50(μg/g C_org.Higher PASC contents (450～850(μg/g C_org) are observed in the samples of SC1,SC2,PK1 and the samples from Konrad section.Their R_o values are between 0.7 and 0.9%,and their base metal contents are lower than 5%.In a highly mineralized sample with base metal content of 23.1%,the PASC content is only 52(μg/g C_org.This phenomenon may be explained by the preferential reaction of sulfur with base metals during the depositional process.Only after metals are used up,sulfur would react with organic matter and form PASCs.The depositional environment,kerogen type and the migration of PASCs from other strata are apparently not the predominant factors for the formation of PASCs in the Kupferschiefer.

Abstract:Taking the coal gangue from Shandong Jining №3 coal mine as research object,a research about the differences of the leaching characteristics of heavy metal between dynamic leaching and static immersion was carried out.The result showed that: the concentration of heavy metals which were leached is affected by the background value of the heavy metals in the coal gangue.The higher the background value is,the larger the concentration will be(except Mn).Static immersion is not the limit of dynamic leaching,the damage to the environment that dynamic leaching made was larger than that of static immersion.According to the environmental quality standard of surface water,whether the dynamic leaching or the static immersion,only the concentrations of Cr and Pb were over the third level standard values.The pH of leaching water was beyond seven,but it wasn't over the third level standard values of national surface water.

Abstract:The numerical simulation method by EASY% Ro is used to simulate and reiterate the thermal evolution history of the No.2 coal mine in eastern Fengfeng,and the characteristics of the coal's generation and evolution are discussed.The coal mine in eastern Fengfeng,which is influenced by the structure movement and the magmatic activity,is thought to experience two stages that the gas generated.In the early stage,it is mainly affected by the region plutonic metamorphism,and the organic matter of the coal is generated gas under the plutonic metamorphism function;while in the late stage,it is influenced by the magmatic activity,and the coal seam in the area is further deteriorated,then coal-seam gas is generated again.Accordingly,gas-bearing property and its major control factors in the research area are analyzed,such as the lithology of the coal reservoir roof and floor,the characteristics of the distribution,the geologic structure,the magmatic intrusion and the hydrogeological conditions and so on,which lead to uneven distribution of the methane content of the coal-seam in the plane and the section planes.

Abstract:Taking the Nanyang 1 tunnel for example,reinforcement measures for tunnel entrance including extending the sets of arches and pipe-shed-type to deal with broken rock semi-exposed were introduced.The support beam was used to resist lateral pressure of surrounding rock based on conjunction with "stress balance" principle.These measures above can weaken vibration bias force produced during the tunnel excavation and can make sure construction security.

Abstract:Based on the characteristics of quality of pile with bearing base difficult to control,the influencing factors of pile quality are analyzed,and the reduction model of influencing factors is established according to the rough set theory.With the example of the pile project with bearing base in Handan city,the minimal influencing factors set are obtained,and the core influencing factors of pile with bearing base quality are built,which provides theoretical basis for quality prediction and the control of pile with bearing base.The results show that the method overcomes the subjective and qualitative factors and achieves with high reliability.

Abstract:As mining investment is a kind of venture capital,there are a lot of uncertainty and ambiguity in the process of evaluating on mining investment decision.With the data mining technology,the relationship of object classification and index membership is affirmed based on the entropy to mine knowledge information about object classification hidden in every index.The redundant data in index membership for object classification is eliminated by defining distinguishable weight and extracting valid values to compute object membership.The new algorithm of membership degree transformation consists of three calculation steps which could be summarized as "effective,comparison and composition",and denoted into M(1,2,3).The new algorithm is applied in fuzzy evaluation on mining investment decision,and the case study indicates that this method is characterized by practicability and high confidence for application.

Abstract:The classic algorithm of k-means is discussed,that is one of the most widespread methods in clustering,including both strongpoint's and shortages.Not only is it sensitive to the original clustering center,but also it may be affected by the k.Given these shortages,an improved algorithm is discussed,which makes improvements in k and selection of original clustering center.To select original clustering center based on the max-min distance.This paper presents the application which all show that the improved algorithm can lead to better and more stable solutions than k means algorithm.The experiment and application affection by the outliers is down to a much low figure.The improved algorithm was used to the students' score analysis in universities and had a good closer.

Abstract:Ruin theory is the core of risk theory,the compound Poisson risk model is always the hotspot area to be studied in ruin theory.This paper presented the compound Poisson risk model with two dividend Thresholds strategy and constant interest force and obtained the general solution to the integral-differential equation of the Gerber-Shiu expected discounted penalty function on the basis of the author's former studying when δ=0.

Abstract:As a new kind of intelligence optimization method,genetic algorithm,with the features of simple structure and strong adaptability,achieves great success in many real fields,but still there are some shortcomings such as greater computation complexity and more chance of being trapped into local states.This paper analyzes the deficiency of the existing genetic operation and the essential characteristics of creature evolution to improve evolution efficiency,and proposes a composite genetic algorithm based on multi-reserving strategy(MRS-CGA for short).Moreover,it analyzes the performances of MRS-CGA by the theory of Markov chains and simulation technology.All the results indicate that,MRS-CGA is essentially the extension of ordinary GA,and obviously better than ordinary GA in computation efficiency and convergence performance.

Abstract:A new semi-fragile watermarking algorithm for image content authentication based on chaotic mapping is presented.Chaotic sequence generated from the block itself by means of Logistic mapping is used to generate watermarking embedding;then the generated watermarking information is embedded into LSB plane of another image block with Torus Automorphism mapping,which the corresponding relation is determined by the secret key to establish the correlation among the image blocks.The results show that the method could localize the tampered watermarked image by using the high sensitivity on initial value of the chaotic mapping without host image in watermark extraction.Moreover,watermarked images obtained have good subjective quality,precise localization of tampered areas,and the algorithm is simple and safe.