Abstract:According to the uncertainty and the inherent randomness of unmeasured nodal positions, a stochastic deviation method (SDM) was proposed to reckon the geometric shapes of existing spatial structures. In a consideration of the characteristics of spatial structures, the sampling principle and the minimum sample size calculation approach in SDM were given. Based on the probability and the statistics theory, the procedure for inferring the random fields of nodal position deviations was built. In addition, the prior information concept was introduced into SDM, and approaches for inferring the stochastic parameters with prior information were put forward based on the Bayesian statistics theory. Finally, the proposed SDM was adopted to reckon the geometric shape of reticulated shell structures, and the nonlinear static stability analysis was carried out using SDMdetermined structural spatial positions. It is shown that SDM can give realistic results and be used for the appraisal of existing spatial structures.

Abstract:In order to reveal the correlation between structural damping and structure amplitude of steel structure buildings, the generation mechanism of structural damping related to displacement amplitude was analyzed, and the stickslip friction between walls and steel members was proved to be the cause of displacementdependent nonlinear damping. Based on the stickslip motion principle, the mechanism of nonlinear damping related to displacement amplitude was analyzed theoretically, and the expression of displacementdependent nonlinear damping ratio was deduced. With numerical simulation methods, the accuracy of theoretical derivations was examined, and the effect of parameters including the stiffness of walls and the main structure, the displacement response that makes walls start slipping, the fundamental natural frequency and the material damping on displacement dependent damping was studied. By comparing theoretical results with the field measured data, the reliability of theoretical analysis was verified.

Abstract:Five steel concrete composite bridge deck specimens were manufactured and subjected to negative moment loading. It could be observed that the strain of rebar and steel plate of splitting section does not obey the plainsection assumption. The strain of rebar is obviously larger than the value calculated according to the plainsection assumption. Then, a formula which can be used to calculate the rebar stress of cracked section was deduced. The calculating results agreed well with the test values. Finally, different crack width predicting methods were compared. The results show that when using the formula recommended in this paper to calculate the rebar stress, adopting the crack width calculation formula specified in JTG D62 2004 and using the parameters of eccentric tension member, the calculated crack width agrees well with the test values.

Abstract:Six concrete frame beamends were tested under low frequency cyclic loading. The seismic behaviors of the specimens with HRB500 highyieldstrength longitudinal rebars and twopiece closed stirrups were analyzed including failure mechanism, hysteretic behavior, skeleton curves, drift ductility and bearing capacity. The results show that the beamend interface and the horizontal interface of composite beam crack and slip，which results in the pinching of hysteretic loops. At the meantime, the energy dissipation capacity and the bearing capacity of the composite beams are smaller than the castinsitu one. Moreover, the displacement ductility factor of specimens is from 3.6 to 4.5. The bearing capacity of composite beams is similar to the castinsitu one, the average ratio of two is 0.90. However, the ratio of composite beams’ ultimate bearing capacity is 1.31 times of that calculated by the code GB 50010—2010. The specimens’ longitudinal rebars yield before the peak load, and the stirrups of the specimens which are subjected to the diagonaltension failure also yield. The effect of stirrup arrangement and beamend interface type on displacement ductility and bearing capacity is not obvious.

Abstract:Field Measurement of Wind and Acceleration on Shanghai World Financial Center

Abstract:A bedroom in Shanghai was used for numerical calculations and twooperation modes were assumed. The energy consumed for heating and cooling and the thermal comfort during the offperiods were measured. The results show that the temperatures are closer to the design temperatures at the air conditioner (AC) start moment when placing the insulation layers on the outside of the exterior walls. The temperature variation speeds of the bedroom are faster when placing the insulation layers on the inside of the exterior walls. Taking the energy used during the AC onperiods and the thermal comfort during the offperiods into considerations, the thermal performance is better when placing the insulation layers on the outside of the exterior walls.

Abstract:The urban form of Shanghai neighbourhood was examined as it evolved from 1984 to 2015 in the context of urban renewal. The urban form was evaluated comprehensively based on space syntax as well. The effect of urban renewal on urban spatial was revealed. It implies that the urban form affected by urban renewal, which is dominated by commercialization, is characterized as grain urban pattern, lax street network, high intensity development and neighbourhood isolation. The urban form of different blocks is related with various degree of renewal process. Finally, it is found that the construction of spatial diversity and the conservation of traditional urban culture and business should be paid more attention in the process of urban renewal in downtown area.

Abstract:A method of traffic conflict discrimination based on vehicle motion pattern is established using traffic conflict theory and video processing technology. According to the principle of safety pyramid and vehicle motion patterns, this paper presents a comprehensive and quantitative traffic severity indicator which is collision probability index and its calculation formula. In view of the spacetime tranfer characteristics of sample trajectories, the structures of the hidden Markov models are first determined for various trajectory clusters, and then the learning and prediction algorithm of vehicle motion patterns based on hidden Markov theory is established. Finally, the complete video analysis system is realized and tested in the real traffic scene. The experimental results have confirmed the feasibility and reliability of the proposed method.

Abstract:Assuming that the car’s speed is constant along the road segment, the traffic platoon dispersion model was developed from the perspective of flow. The parameter of peak range of variation coefficient of the predicted and actual arriving traffic flow distribution was chosen for model evaluation. Besides, the influence of data collector location, link segment length, traffic volume and flow direction on the predicted results was analyzed. Comparing with the static average speed model, the results show that the data collector location and the link segment length have a trivial effect on the prediction model. The trend of the model performance was summarized for different volume levels and different flow directions. It can be concluded that the proposed model is effective and available for predicting the distribution of traffic flow arriving at downstream intersection based on the simulation experiment and field investigation.

Abstract:Based on typical truck’s climbing performance in real driving test, the truck’s speeddistance curves on different gradients at different altitudes were built. The results show that the truck’s climbing speed on slope decreases more rapidly and the stable speed on slope is lower at a higher altitude when the altitude is between 3 000 m and 5 000 m. Then, the maximal gradient of highway with design speed 100, 80 and 60 km?h-1 in highaltitude area was proposed. Compared with that specified at the same design speed in general area in existing standard, it decreases by 1%~2%.

Abstract:Based on the carbon emission data during 2005—2014 of Guangxi, the logarithmic mean Divisia index method was adopted to decompose the carbon emission factors such as economic development, energy structure and efficiency, and the carbon reduction potentialities of Guangxi were analyzed. The results show that the per capita carbon emission of Guangxi increases, and the economic development is the main pulling force, while the energy structure and energy efficiency are the inhibitory forces. The great potentiality for carbon emission reduction is in the industry, especially in the energyintensive industries. Finally, some suggestions on how to prioritize the carbon reduction targets in Guangxi and implement them stage by stage were proposed, and some measures for carbon emission reduction, such as technology, management, economic structure and energy structure, lowcarbon development construction system, and so on, were put forward.

Abstract:A new nano composite matertal of EDTACoMgAl layered double hydroxides (EDTACoMgAlLDHs) was synthesized in the ways of coprecipitation. Then, Xray diffraction（XRD） and inductively coupled plasma（ICP） were used to characterize the properties of the material. The azo dye reactive black 5 was chosen as a target pollutant to study the effects of initial pH, concentration of target pollutant and temperature on adsorption. Finally, the properties of EDTACoMgAlLDHs as catalyst for Fenton reaction were discussed preliminarily. It is found that the maximum equilibrium adsorption was 330 mg?g-1 under the conditions of normal temperature and neutral pH. The catalytic oxidation and adsorption efficiency was complementary with increasing pollutant concentration. The total removal efficiency reaches up to 90% with the initial pollution concentration range of 120~360 mg?L-1.

Abstract:A process for the dehydration of fructose into 5hydroxymethylfurfural (HMF) was developed in ionic liquid 1butyl3methyl imidazolium chloride (［C4mim］Cl) by using Beta zeolite as the catalyst. The effects of reaction temperature, reaction time, catalyst dosage and substrate dosage on the conversion of fructose and the yield of HMF were discussed, and the reaction kinetics was analyzed. Using 0.200 g fructose as the substrate, under the optimal conditions of catalyst dosage of 0.140 g, reaction temperature of 100 °C and reaction time of 4 h, the yield of HMF was 78.2%. The ionic liquid and catalyst could be recycled and exhibited constant activity within 5 cycles. The kinetics analysis indicates that the activation energy of the reaction was 53.9 kJ?mol-1.

Abstract:In this paper, an ultrahigh ductile cementitious composite （UHDCC）with a mixture of reactive powder is prepared based on the design concept of fracture mechanics. High strength and high modulus polyethylene fiber is used as reinforced materials in the composite. Axial compression test, elastic modulus test and fourpoint bending test are conducted to prove that the ultimate tensile stress strength of the material is up to 20 MPa, the corresponding average tensile strain is close to 9%, and the axial compressive strength exceeds 110 MPa. It is proved by fourpoint bending test that the flexural performance of UHDCC beam reaches the level of ordinary reinforced concrete beam with 1.5% reinforcement ratio and its ductility is good.

Abstract:The impact of calcium sulfate (anhydrite and desulphurization gypsum) on the hydration of calcium sulfoaluminate (CSA) cement, such as compressive strength, drying shrinkage ratio, hydration heat of early stage and microstructure evolution, was measured. Results reveal that, the early hydration of CSA cement is accelerated by the addition of calcium sulfate, resulting in higher 1day compressive strength and lower drying shrinkage once the dosage is less than 20% (mass ratio). However, with the increasing amount of calcium sulfate, 3day and 28day strength is prominently decreased, and even the retraction of strength happens when doping with excessive calcium sulfate. Compressive strength has no direct correlations with ettringite amount, while it has positive correlation with the alumina gel amount. Additionally, to achieve CSA cement with better properties, it is very promising to replace anhydrite with desulphurization gypsum.

Abstract:In this paper, through the axial compression test of lightweight aerated concrete after high temperature, the relationships between temperature and mechanical properties, such as compressive strength, elastic modulus and peak strain, are obtained. The results show that the compressive strength of lightweight aerated concrete increases slightly at 100 ℃, and decreases gradually at 300 ℃. When the temperature exceeds 300 ℃, the strength change indistinctively. At 100 ℃, the elastic modulus remained basically unchanged; across 100 ℃, the elastic modulus decreases continuously, and comes into being linear relationship with temperature. With the increase of temperature, the peak strain gradually increases in a linear upward trend. Finally, by analyzing the stressstrain curves at different temperatures, a constitutive model of lightweight aerated concrete after high temperature is proposed.

Abstract:In this paper, numerical simulation is employed to calculate the flow field in 1∶15 wind tunnel with 3/4 openjet test section. Two measurement methods of wind speed tested at the nozzle and the chamber were adopted and a correction method of velocity data derived from wind tunnel test is proposed based on comparative analysis. Simulation results indicate that, for empty wind tunnel at the different upstream velocities, the two methods both show good agreement with test data; for wind tunnel with car model in the test section at the wind speed of different Reynolds numbers, the predicted velocity results of both two methods need to be corrected due to the blockage effect of test model on the pressure distribution around the nozzle area. The coefficient for pressure correction can effectively improve the prediction accuracy of wind speed, because it is a higherorder polynomial term depending on the upstream velocity.

Abstract:Within the wind speed range of automotive airconditioning condenser, the scheme of airside parametric numerical simulation for parallel flow condenser was designed by orthogonal method, and the coefficients of flow friction and heat transfer were calculated. Moreover, the effects of fin height, overturning length, fin pitch, fin width, louver pitch and louver angle on airside flow friction and heat transfer were analyzed by Taguchi method. Finally, the optimal airside parametric combination of parallel flow condenser was obtained. The results show that the fin width plays an important role in heat transfer. The effect of fin pitch on flow friction is the biggest. The fin pitch, louver angle and louver pitch of parallel flow condenser has main effect on airside performance. Overall thermalhydraulic performance improves by 4.03% to 11.09% for Re in the range of 600~1 400.

Abstract:By analyzing the morphological characteristics of artificial ear, the curve planning and the machining method in auricular prosthesis forming were studied and a quick forming scheme of combining parallel mechanism and 3axis numerical control machine tool was put forward. Then, the mathematical model of forming curve was established. Through designing the structural parameters of Stewart parallel mechanism and inverse position analysis, the law of posture transformation of the parallel mechanism in the forming process was obtained. Finally, the virtual prototype technology was used to simulate the kinematics of the parallel mechanism, which verifies the feasibility and correctness of the forming scheme.

Abstract:An experiment of automatic correction of finger movement was designed. In the experiment, participants were asked to quickly point to a target’s position with right thumbstick controlling a handcursor on a screen and electroencephalography(EEG) signals were recorded as well. The relevant eventralated potenial(ERP) components were analyzed by trials data averaging. The results show that a negativity at 150 ms and a positivity at 320 ms were found in jump trials.

Abstract:A fuzzy query model for scalable vector graphics(SVG) format maps with layer definitions is proposed in this paper. In the model, a word repository is constructed to store the related words and fuzzy query patterns. When users execute queries, a word segmentation subalgorithm decomposes the query statement into words according to the word repository. Then a semantic analysis subalgorithm converts the words to the fuzzy query patterns. The fuzzy query patterns are connected with the elements on a related layer or layers in an SVG format map. These elements will be highlighted as query results. Experiments are conducted to validate the effectiveness of the proposed model.

Abstract:By using the fact that tensor space Ω5k can be written as a direct sum of tilting modules for the quantum enveloping algebra (qSchur algebra) of glk(2) and the structure of tilting modules for n=2, we will determine the dimension, a set of generators and the decomposition of principal modules of Endsk(2,5)(Ω5k) and Enduk(2,5)(Ω5k), when Ω5k is considered as a module of the infinitesimal qSchur algebra and the little qSchur algebra.

Abstract:A cascadic multigrid algorithm based on the weak Galerkin finite element discretization was analyzed for the second order elliptic partial differential equations. The estimation of the error in energy norm and the analysis of computational complexity were given. Finally, numerical experiments were conducted to verify the theoretical results.