Abstract:Stateoftheart research and application advance on tall wood buildings are summarized based on the current research situation abroad. Specially, an innovated engineering wood product, crosslaminated timber (CLT) is emphasized for its rolling shear property, which is the dominant factor of outofplane capacity. The key issues on tall wood buildings, such as structural systems, seismic and wind resistance, connection capacities, as well as fire resistance are expatiated. On account of reviews of the latest study, this paper indicates that the connection of members, load path and force distribution in structural systems are the key points of future research. Meanwhile, research on fire resistance of tall wood buildings can learn some experience from lowrise and multistorey wood buildings, but the height of building and the quantity of residents should be especially concerned. Finally, research prospects on development of Chinese tall wood buildings are proposed, and the key issues are analyzed and summarized.

Abstract:The finite element analysis model of a welded H section steel member subjected to vertical axial compressive force and horizontal load is created to simulate the plate assembly elastoplastic interactive buckling behavior. A series of nonlinear finite element analyses for nonplastic section members with different axial compression ratio, flange widththickness ratio, web heightthickness ratio and flangeweb thickness ratio are performed to evaluate the ultimate moment ratio due to elastoplastic local interactive buckling. A number of correlation curves of ultimate moment ratio versus aforementioned parameters demonstrate that the ultimate moment ratio decreases significantly with increased axial compression ratio and flange widththickness ratio. The normalized fitting formula of ultimate moment ratio is achieved with high accuracy. The allowable widththickness ratio correlation curves are derived on the basis of the principle of simultaneous overall and local interactive buckling. The flange and web widththickness ratio limitations given in the Code for Design of Steel Structures may exceed the parameter regions enclosed by the allowable widththickness ratio correlation curves under certain conditions.

Abstract:Four shortleg steelconcretesteel composite shear wall specimens with shearspan ratio of 1.0 and 2.0 under monotonic and cyclic loading, were designed to investigate their failure mode, ductility, stiffness, loadbearing capacity and energy dissipation. The experimental results indicated that four composite walls failed in a flexuredominated mode, undergoing concrete cracking, steel faceplate buckling and yielding, concrete crushing, steel faceplate fracture. The composite walls showed good deformation capacity with ductility coefficient more than 3.0. The wall with shearspan ratio of 2.0 had better ductility than the wall with shearspan ratio of 1.0. Compared with the wall under monotonic loading，the loadbearing capacity and ductility coefficient for the wall under cyclic loading were reduced by more than 10%. The wall under cyclic loading showed severer buckling of steel faceplates and damage of concrete, which reduced its energy dissipation. Structural measures to prevent buckling of steel faceplates are discussed.

Abstract:The developments and research status of seismic vibration control of longspan spatial structures using multiple tuned mass damper (MTMD) are introduced in this paper. The dynamic equation of reticulated shell with MTMD vibration control system is derived and solved. Based on controlling selected natural modes, the design procedure of distributed multiple tuned mass damper (DMTMD) seismic control method of the single layer spherical reticulated shell is proposed. A numerical model of single layer reticulated shell is built. By the method of timehistory analysis with “El Centro seismic waves”, the dynamic responses of the reticulated shell structure equipped with different seismic vibration control schemes are computed, analysed and compared under horizontal and vertical seismic excitations. The numerical results show that the proposed seismic vibration control method is efficient in reducing dynamic response of reticulated shell structures. Beyond that, some suggestions for seismic vibration control optimization design are summarized.

Abstract:This paper focuses on the premature theoretical analysis and experimental research of high strength bolted zigzagplate connections of aluminum alloys. It is found that the factors affecting the bearing capacity of the connection are prestress in boltes, thickness plates and zigzag dimensions. Shearresistant capacity tests were conducted for aluminum alloy component with high strength bolted zigzagplate connections (HSBZP). The test results showed that high strength bolted zigzagplate connections had copious advantages including but not limited to reliable force transferring, comparatively slight deformation and much higher capacity than regular slipcritical bolted connections, The zigzag plates increased the slip resistance of the connection.

Abstract:In this study, the finite element model of Polonggou cablestayed bridge is established using OpenSEES software considering multiple nonlinear effects. 80 pairs of ground motions are chosen from Pacific Earthguake Engineering Research Center(PEER), with the input of longitudinal and transvers direction. The five index: efficiency, practicality, proficiency, sufficiency and hazard computability, are adopted to discuss and compare the advantage and disadvantage of the five IMs, peak ground acceleration(PGA), peak ground velocity(PGV), SaT1、Sa02、Sa10(acceleration response spectrum at the period of the first mode, 0.2 s and 1.0 s). The results shows that PGA is the best in terms of the index of sufficiency and practicality, and relatively good in terms of the index of efficiency and proficiency. So the PGA is the selected as the best intensity measure(IM) for cablestayed bridges.

Abstract:As many existing or underconstruction bridges are of lower height from the ground, the height could probably become a key factor to the windinduced responses of bridges, hence it may have an adverse influence on the aerostatic and aerodynamic performances of bridges under wind loads. In this paper, wind tunnel tests and numerical simulation methods were adopted to study the ground effects on the static responses of a closed box girder. Frist, wind tunnel tests have been conducted to study the variation rules change laws of the static force coefficients correlated with the height from the ground of the closed box girder. It is found that ground effects will adversely affect the static wind stability of the closed box girder. Second， computational fluid dynamics (CFD) numerical simulations have been conducted to study the variation rules of the static force coefficients correlated with the height from the ground of the closed box girder. Through the CFD flow fields of the girder, ground effects mechanism on aerostatic performance of the closed box girder has been analyzed and described.

Abstract:Field vaneshear test (FVT) and Unconfined Compression test (UCT) are the conventional method for measuring the sensitivity of soft clay in the engineering investigation. Based on the data collected from the domestic soft clay and some regions in US and Japan, the sensitivity and strength obtained by FVT and UCT are compared in detail and the influence of remolding method is also investigated. It is found that the sensitivity obtained by the FVT test is significantly smaller than the UCT and it will underestimate the sensitivity of soft clay, FVT obtains significantly higher strength than UCT tests, especially in the remolded strength. Remolding method used in FVT is found an important influence factor. In addition, the correlations between remolded strength, sensitivity measured by FVT and liquid limit index are found not good and inconsistent with the published experiential laws. The remolded strength and sensitivity obtained by FVT are unreliable and it should be taken into consideration in evaluating the sensitivity and structural of soft clay.

Abstract:Temperature field is required to be known when designing the insulation layer length of tunnels in cold region at present. To overcome the lack of measured temperature data inside the tunnel, this paper presents an approach for insulation layer length on the basis of temperature field analytical solution which is derived from inlet and outlet weather conditions and terrain conditions. Due to the equal of temperature amplitude that is subjected to the meteorological parameters, the critical length is obtained. When the distance from tunnel entrance is less than critical length, inlet meteorological parameters are adopted to calculate surrounding rock and lining temperature filed in tunnel inlet section. Otherwise outlet meteorological parameters are used. Moreover, the length of insulation layer is determined by the position where 0℃ is occurred on the interface of primary lining and surrounding rock. With the help of insulation layer, the convection heat transfer between air and surrounding rock has changed. Since energy flowing into the surrounding rock in the two cases is equal, the correction coefficient of insulation layer length is confirmed. Combined with the actual project, the length of insulation layer is calculated by the proposed approach. In addition, the influence of the critical parameters (temperature gradient, wind speed) on temperature field is analyzed. The research results show that the needed length of insulation layer decreases as the geothermal gradient increases, and the narrows can be up to 50%, while it increases rapidly as wind speeds up.

Abstract:A diffusion equation of chloride ion in concrete was put forward based on Fick's second law. In the equation, the influences of timedependence of chloride diffusivity, the effect of load on diffusion coefficient and chloride ion binding capacity of concrete were taken into consideration. A prediction model of service life of reinforced concrete (RC) square piles was established. The effects of cover thickness, cracking width, surface chloride ion concentration and the chloride threshold level on service life of RC square piles were analyzed. The analysis results indicate that the diffusion equation of chloride ion of this paper agrees well with the experimental data. It suggests that the cover thickness should be greater than 45 mm and the cracking width should not be greater than 0.1 mm if the design service life of RC square piles is 50 years.

Abstract:A numerical wave model of the Yangtze River Estuary (YRE) was established based on MIKE 21 SW and validated with field wave measurements. After the validation, the model was applied to simulate three scenarios of different sea level rises (0.5, 1.0, 1.5m). The general changing features of wave due to sea level rise in the YRE can be summarized: the time history of wave height and wave period agree with that of tidal level, and the increase of wave height at high water level is larger than that at low water level; wave height increase inside the entrance is less than that out of the entrance, and shoals are places with the biggest impact where increased wave height on the windward side is larger than that on the leeward side; the impact of sea level rise on wave period is similar to that of wave height, but is less affected.

Abstract:To investigate the influence of grouting layer of shield tunnel on dynamic stresses of saturated soil under a harmonic loading, a modified shellcylinder model is established. The lining and grouting layer of the shield tunnel are conceptualised as a double cylindrical shell and the saturated soil is conceptualised as a hollow cylinder with infinite radial extent. Based on the Flügge’s shell theory and Biot’s wave equations, the dynamic stresses of the soil induced by a stationary harmonic point load in the tunnel are analyzed. The results show that: The amplitude of radial normal stress τrr and porepressure Pf of the soil beneath the grouting layer decreases with the increase of the longitudinal distance measured from the load point, and the amplitude of shear stress τrz of the soil increase firstly and then decrease with the increase of the longitudinal distance measured from the load point, which attenuate to zero as the longitudinal distance is approximately 3D (D is the diameter of the tunnel). A worse permeability of the soil leads to a greater amplitude of radial normal stress and porepressure. However, when the soil permeability coefficient k is approximately smaller than 10-5 m?s-1, the effect of the soil permeability on the amplitude of dynamic stresses is limited. The grouting layer can reduce the radial normal stress and porepressure of the surrounding soil (approximately 5%~8%); the magnitude of radial normal stress and porepressure of soil beneath the grouting layer decrease linearly with the increases of the thickness of grouting layer. However, the changes of the Young’s modulus of the grouting layer within a certain range of 50~650 MPa almost have no effect on the dynamic stresses of the saturated soil.

Abstract:The trainnet coupling simulated model combined CRH2 type highspeed electric motor units (EMUs) with the certain actual doubletrack autotransformer (AT)structure traction net is built by multiconductor transmission line equivalent order reduction method. With the model, the influences of various factors on resonance frequency and harmonic current amplification factor of traction net when EMUs run in fixed positions, dynamic positions, different conditions and different power are analyzed. The simulation results are verified by the measured data. In the end, Ctype filter is proposed to suppress the harmonic current, and the methods of parameters design and installation location selection for filter are proposed to make sure the electrical matching between EMUs and traction nets after filtering. The corresponding suppression effects of traction net harmonic current amplification are also simulated and validated when Ctype is installed at satisfied section post (SP).

Abstract:This paper presents a markov model based adaptive traffic signal controller for dilemma zone(DZ) at signalized intersections. With the realtime traffic data of vehicles trapped in the DZ, the probability distribution of vehicles in the DZ is predicted using markov model, while the statetransition matrixes is rolling updated using the nnearest neighbors algorithm. Taking the phase time and the predicted trapped vehicles into account, the model of equivalent number of vehicles in the DZ is developed, and then under the realtime decision signal control strategy, the green phase time is adjusted accroding to the defined risk probability of switching phase. Extensive experiments were conducted on a typical isolated intersection in Guangzhou via online VISSIM simulation under different traffic conditions, and the sensitive analysis of model parameters were analyzed in detail. The simulation results have demonstrated that with the calibriation of model parameter, the developed controllers has the great potential in the reduction of vehicles trapped in the DZ, as well as the average traffic delay.

Abstract:Pedestrian exit selection behavior during evacuation process in a rail transit station is restricted by pedestrians’ perceptual as well as cognitive abilities. Moreover, pedestrian may reselect the exit according to his or her current position and the realtime exit conditions. To simulate these behaviors, a dynamic exit selection model is presented. A perceptual parameter and a series of cognitive coefficients are introduced in the model to reflect pedestrians’ perceptual and cognitive level. Besides, two subjective evacuation time computing approaches are proposed to simulate pedestrians’ exit selection and reselection behavior. A scenario of a station platform is built. A number of simulation experiments are run to study the effect of pedestrians’ perceptual parameter and cognitive coefficients on total evacuation time. The results show that the total evacuation time is sensitive to model parameters, furthermore, exit selection and reselection behaviors can be modeled. It is found that when pedestrians can perceive only a few exits or pedestrians prefer waiting, the station staff should guide pedestrians who evacuate from the crowded exit to use the unobstructed exit; whereas when pedestrians can perceive enough exits and they prefer walking, measures should be taken to help them to choose a rational exit and let them wait a bit longer in front of the exit.

Abstract:This essay focuses on how land use mix quantitatively impacts urban rail transit ridership at stationlevel by nonlinear regression model. Distancedecay weight and weight of population in mutual service area assigned to each station are used to weigh population within service area of station. Then ridership divided by weighted population is taken as dependent variable to analyze what is the relationship between land use mix and ridership at stationlevel. Least square support vector machine is the ideal model to do the above thing. Finally, data of 109 stations in Tokyo, Japan are taken as case study, result of which shows land use mix has a little influence on ridership at stationlevel and meanwhile, employment/inhabitants within service area of station has a significant influence on ridership at stationlevel. So, employment/inhabitants should substitute land use mix and be taken as key predictor for ridership at stationlevel.

Abstract:The floating photocatalysts of NP codoped TiO2 grafted on expanded graphite C/C composite (NPTEGC) were prepared by a onestep solcarbonization method. The catalysts were characterized by fieldemission scanning electron microscopy (FESEM), brunaueremmettteller (BET), Xray diffraction (XRD), UVvis diffuse reflectance spectrum (UVvis DRS), Xray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR). The results show that NPTEGC (NP codoped TiO2/expanded graphite C/C composites) has a wormlike 3D structure and TiO2 particles can be seen on the surface of EGC. As for the doping elements, N doped into the TiO2 crystal lattice mainly by the substitution of lattice O while P doped into the TiO2 crystal lattice mainly by the substitution of lattice Ti. After NP codoping, the light adsorption scale of the composites has been significantly improved. The properties of photocatalytic inactivation of algae cells by NPTEGC with different calcination temperature were investigated. Comparing with the condition of no catalyst adding or no photocatalyst loading, NPTEGC composites have a significant advantage in inactivation of algae cells. The optimal type of NPTEGC was synthesized at the calcination temperature of 450 ℃ and the removal rate for 9 h was above 98 %. Moreover, the floating materials could be easily separated and reused, showing great potential for practical applications in environmental cleanup and solar energy conversion.

Abstract:The expanded graphite loaded with ferric hydroxide (EGFeOH) is prepared successfully. Its most suitable synthesis conditions are 0.26mol/L of ironic concentration and 100min of immersion time, respectively. The Langmuir model and the pseudo secondorder model are more suitable for well elucidation of the experimental data, indicating that the adsorption of phosphate is a monolayer chemisorption process. The positive ΔHΘ and negative ΔGΘ indicate that the process of phosphorus adsorption onto EGFeOH is spontaneous and endothermic. It is favorable for the phosphorus adsorption with the rising of temperature to some extent. EGFeOH performs excellently for phosphate adsorption in low concentration (5 mg?L-1). The ion exchange and lewis acidbase interactions are manifested to be two main mechanisms for phosphate adsorption of EGFeOH revealed by Fourier transform infrared (FTIR) spectroscopy and change of pH values associated with the adsorption process. The EGFeOH after adsorption is also recovered using sodium hydroxide (NaOH).

Abstract:In a slurry reinjection project, the evaluation of reservoir storage capacity and influence range are two important aspects, especially during the process of design and construction. Two key parameters, the formation depth and the formation permeability, were evaluated and their sensitivities were analyzed by using numerical simulation method for the case of injection with constant rate. Our results show that the reservoir storage capacity can be approximated as an exponential function of the injection formation depth and permeability. The influence range is kind of linear function of the two parameters. The results indicate that storage capacity and influence range can be significantly affected by the two parameters. Therefore, in the process of evaluation of reservoir storage capacity and influence range, the influence of formation depth and permeability should be seriously considered.

Abstract:For the nonlinear systems with unknown inputs and measurable noises, the design method of unknown input observer based on the TS model is discussed. At first, the calculation method of the coefficient matrix of the TS model constructed based on nonlinear system is presented. Then, the TS model is used as the design model, and the system is extended to an augmented system by extending the measurable noise as an auxiliary state. And then, for the TS model, a fuzzy adaptive observer is designed to achieve the objective of the simultaneous estimations of the states, the unknown inputs and the measurable noises of the nonlinear system. Meanwhile, the sufficient condition of the existence of the observer is given based on a linear matrix inequality. Finally, simulation examples demonstrate the effectiveness of this method.

Abstract:This paper presents a fMRI timeseries classification diagnosis model based on particle swarm optimizationsupport vector machine (PSOSVM), which achieves more accurate judgments and distinctions between patients and healthy individuals by deeply analyzing multidimensional timeseries data of brain regions. This approach is significantly different from the other existing related research work in four aspects as follows: Constructing the feature representation for multidimensional timeseries data of brain regions based on the autoregressive (AR) model; Constructing the classification scheme for multidimensional timeseries of brain regions based on the support vector machine (SVM) model; Constructing the parameter optimization strategy for the classification learning based on the particle swarm optimization (PSO) algorithm; Constructing the classification diagnosis framework for fMRI timeseries data by integrating the above feature representation, optimized classification and parameter optimization patterns. With the mental depression disorder (MDD) as a specific case of empirical analysis, our classification diagnosis model has obtained very positive numerical computation results.

Abstract:Finite volume methods are developed for pricing American options under Kou jumpdiffusion model. Based on a linear finite element space, both backward Euler and CrankNicolson full discrete finite volume schemes are constructed. For the approximation of the integral term in the partial integrodifferential equation (PIDE), an easytoimplement recursion formula is employed. Then we propose the modulusbased successive overrelaxation (MSOR) method for the resulting linear complementarity problems (LCPs). The H+ matrix property of the system matrix which guarantees the convergence of the MSOR method is analyzed. Numerical experiments confirm the efficiency and robustness of the proposed methods.

Abstract:Based on the sound powers of the basic aerodynamic sound sources (monopole source, dipole source and quadrupole source) radiating to the far field and their relations with the moving speed, the feature size, the distance from the observation point and the media characteristics etc, a conversion formula of the aerodynamic sound pressure level (SPL) radiating to the far field between the model and the prototype was derived. Moreover, the aerodynamic SPL outside the flow for a highspeed train model was measured in an aeroacoustic wind tunnel. Based on the testing results and the conversion formula, the aerodynamic SPL of the highspeed train model at higher wind speed was derived from them at lower wind speeds. At the same time, the correctness of the conversion formula has been verified by the testing data. The studies above show that the conversion formula reveals the relationship of the aerodynamic noise in the far field between prototype and model and plays an important role to analyze the testing results and convert the data in the model experiment.