Abstract:The equation of motion under nonuniform excitation of supports was derived in the form under uniform excitation. Through the modal analysis, the modal participation factors and the equivalent modal ground accelerations with consideration of traveling wave excitation were obtained, so that the influence of traveling wave excitation on dynamic responses could also be judged in a response spectrum of this equivalent modal ground acceleration. Vibration mechanism analyses with consideration of traveling wave excitation by mode analysis method were carried out for a trial designed symmetrical cablestayed bridge with a central span of 1 400 m. The deformation of the cablestayed bridge under different support displacements due to traveling wave excitation was analyzed by pseudostatic analysis. Effects of traveling wave excitation on seismic response for super longspan cablestayed bridges with energy dissipating system in longitudinal direction, were researched by the displacement timehistory method. The results show that traveling wave excitation decreases energy dissipating of the piers so that seismic damage of the pylons aggravates. Effects of traveling wave excitation on seismic response for longspan cablestayed bridges with energy dissipating system were disadvantageous, especially under longperiod ground motion with the wave velocity within 1 000~3 000 m?s-1. Therefore, traveling wave excitation should be taken into consideration in seismic response analysis of longspan cablestayed bridges with energy dissipating system.

Abstract:Rainwind induced vibration of cables is a type of vibration with large amplitude and low frequency. The phenomenon of rainwind induced vibration of cables of two different diameters is successfully reproduced under simulated raining condition through wind tunnel test. The effects of several main factors on the characteristics of rainwind vibration and spiraled wires countermeasure for mitigation of the vibration are investigated. The results indicate that the mechanism of vibrations with different reduced velocities is different. Vibration with high reduced velocity is more like a type of galloping, while vibration with low reduced velocity is more related to vortexinduced vibration.

Abstract:Based on the calibrated numerical modeling method, a finite element (FE) model of the extended pileshaft used in a simply supported bridge was developed. Then some FE models of extended pileshafts embedded in sands varying different relative densities were established to study the confinement effect of soil on ① the displacement ductile capacity; ② the curvature distribution along the shafts and ③ the equivalent plastic hinge length of piles. The study indicates that confinement effect of soil can enhance the maximum sectional curvature of extended pileshafts at failure significantly, increase both the lateral strength of piles and the displacement ductility factor, and lead to noticeable decrease of the plastic region length and the equivalent plastic hinge length of piles. The equivalent plastic hinge length of piles has a remarkable drop with the increase of the displacement ductility factor.

Abstract:A simplified calculation method based on planar frames is proposed for mechanical analysis and reinforcement design of rib deviator. In the planar frame model, top deck, bottom deck and webs of box girder are represented by 3 dof beams, while the rib deviator is equivalent to vertical and horizontal girders. Longitudinal lengths of the top deck and webs can be set the same as the thickness of the rib deviator for its tiny effect on the analysis. Then the planar frame model can be treated as an upsidedown Tshape beam, so the longitudinal length of the bottom deck can be obtained by analogy of the effective distribution width of Tshape beam. Compared with spatial grid model and ANSYS solid model, the planar frame model has a good coherence with only 5%～20% error in most cases and the solutions are conservative. In the next part, the application results of the simplified calculation method to two practical bridge structures show that the realistic reinforcement amount of the rib deviator is much larger than that by theoretical solution. The simplified calculation method can also be applied to twolayer or multilayer ducts deviators.

Abstract:In order to study the composition of bond stress for steel reinforced recycled concrete (SRRC), composition of bond stress between steel and recycled aggregate concrete was analyzed first, and according to the push out test of 17 specimens, the whole process of SRRC interface bond slip was analyzed. Then, on the basis of the test and theoretical analysis, the level of chemical cementation stress and friction stress of SRRC interface were solved out, and the calculation formula of critical stick length lcr when steel yield was derived. Finally, factors influencing the level of chemical cementation stress and friction stress were analyzed. Results show that increasing concrete strength, stirrup ratio and thickness of the protective layer can enlarge friction stress, and increasing the protective layer thickness can increase friction stress and chemical cementation stress.

Abstract:Dividing the foundation interface and the beam into several segments, and assuming the distribution of the foundation reaction, the beam nodes and the reaction variables are confirmed. By taking the fundamental solutions of the infinite EulerBernoulli beam as the kernel functions of the boundary element method (BEM) of the beam, the boundary integral equation of EulerBernoulli beam is applied to each node so as to establish the boundary integral equations of the foundation beam. The settlementreaction flexibility matrix between the vertical displacements of beam nodes and the foundation reacting forces is formed through Gauss integral by adopting the fundamental solution of layered soils as the kernel function of the boundary element method (BEM) of the subgrade. Finally, the global BEMBEM coupling equations of the soilbeam interaction problem are obtained according to the compatible displacement condition at the soilbeam interface. According to the above theory, the corresponding program is compiled, and further the accuracy of the theory is verified by comprising the results of this paper with the existing reference. Moreover, the influence of the characteristics of the soil layers is analyzed, showing that the BEMBEM coupling method is more efficient than the FEMBEM coupling method.

Abstract:Based on five groups of tenpile indoor model test, considering the influence of lateral load size and its loading position, the vertical bearing capacity of the single pile under combined loads in sandy ground are studied. The results of model test show that without regard to vertical load, horizontal ultimate bearing capacity decreases of the single pile with the height of the point of application by lateral load apart from the ground increases, while its magnitude is reduced gradually. The settlement of pile top increases and vertical bearing capacity decreases with the increases of the preapplied lateral or moment loads of the single pile, and its effect on the magnitude is dependent on the lateral load. The vertical load produced a PΔ effect when it was applied after the lateral and moment loads, which causes the horizontal displacement increases and the ultimate horizontal bear capacity of the single pile decreases. The experiment data indicate that the horizontal displacement at the top of pile is positively associated with settling volume of single pile, tip resistance of pile.

Abstract:Renewable energy resources are usually intermittent and instable. Compressed air energy storage (CAES) provides a good solution to this problem. Underground air storage cavern is an important part of CAES. Artificiallyexcavated hard rock cavern attracts wide attention for its little restriction to geology and wide adaptability. The influence of concrete lining permeability on air tightness of underground cavern was investigated. Based on the Darcy’s law, analytical formulas for calculating the amount of air leakage within underground cavern were derived. Using the derived formulas, air leakage condition under a typical CAES operation pressure was analyzed. Furthermore, some influence factors, including lining permeability, lining thickness and cavern shape, were also analyzed. The results show that, when the inner pressure is 8 MPa and impervious concrete of P8 level is used as lining, air leakage rate will be less than 1%, meeting the operational requirements of compressed air energy storage power station. Air leakage will increase linearly with the increase of lining permeability. Compared with spherical cavern, cylindrical cavern has a better leakageproof effect.

Abstract:A dynamic pavementtire friction model incorporated with water film thickness, aircraft velocity, tire pressure, pavement texture amplitude and slip ratio is proposed based on average lumped Lugre Friction Model. The friction models now available with a consideration of water film thickness could not be calibrated by the field measuring data and used for dynamic friction analysis. The parameters adopted by the proposed model could be obtained by laboratory tests, nonlinear regression and other methods. Based on the field measurement at Shanghai Pudong International Airport, the proposed model was calibrated. The results show that the calibrated model obtains high prediction accuracy, which can be used for dynamic friction analysis and convenient for runway safety management.

Abstract:The aircrafts of new generation, like Boeing 787 and Airbus 350/380, have tire inflation pressure up to 1.5 MPa, which increases the effects of aircrafts with heavy gross weights on pavement response. The epoxy asphalt pavement becomes an ideal choice due to its excellent mechanical properties. A 3D finite element model of airfield epoxy asphalt pavement under nonuniform moving aircraft tire loads was established by ABAQUS and it was validated with field measurements of accelerated pavement test. The effects of tirepavement contact stress distribution, tire inflation pressure, different temperature profiles and material characteristics were discussed with the finite element model. The results indicated that nonuniform distribution of tirepavement contact stress increased pavement strains; epoxy asphalt pavement was a better choice in terms of decreasing rutting and cracking under heavy aircraft loads; however, fatigue cracking of the bottom of epoxy asphalt layer and permanent deformation of the AC layer should be emphasized.

Abstract:Based on the shockwave theory and traffic simulation concept, this paper presents a new reconstruction method of vehicle trajectories on urban arterials with detector data and signal timing data. Unlike the existing methods, the proposed method takes into consideration the impacts of lane change and roadside entrance and exit on vehicle maneuvers without relying on highfrequency floating car data. The proposed method has been validated at a signalized arterial in Qingdao City of China.

Abstract:Two methods, yearonyear prediction method and circularityratio prediction method, are often resorted to in the realtime origindestination(OD) prediction. The former depends on historical information, such as the data about the previous day or week. The latter depends on the data of adjacent period to predict the realtime OD. The size of time granularity, the time period used in the realtime prediction of expressway network has a significant effect on the stability and accuracy of OD prediction results. The Augmented Dickeyfuller Test(ADF) unit root test and Kmeans algorithm are employed to study the effect of prediction results, and the size of time granularity is recommended. Compared with circularityratio prediction method, yearonyear prediction method can lead to the more stable and accurate result and a more satisfied time granularity is between 30 minutes and one hour.

Abstract:Under the condition that fullwidth service lanes are set on truck escape ramps and the width of arrester bed is 9.0 m or 4.5 m, 48 groups of motion parameters in the process of entering truck escape ramps by 5 drivers were obtained through driving simulation UCWin Road Ver.9. Then the minimum turning radius, adjusting time, steering angle amplitude and steering angular frequency were extracted by judging lateral migration rate and validated by theory. The correlation between the above five index and operation speed was analyzed. At the same time, the significance between the above five indexes and the fullwidth service lane’s position was tested via the variance analysis and the paired sample T test. Research result indicates that when the arrester bed width is 9.0 m and service lane is located on the left side, the errant vehicle will be more stable and easier to enter the truck escape ramp, the space to adjust the vehicle’s driving direction will be larger, and it will be easier to enter the truck escape ramp and drivers’ psychological tension will decrease. When the arrester bed width is 4.5 meters and the service lane is located on the left side, the errant vehicle will be more stable and the entrance of the truck escape ramp will be more accessible.

Abstract:In crash risk evaluation study, the relevance between crash occurrence and traffic conditions was analyzed through statistical model. In the model, traffic conditions prior to each crash and corresponding noncrashes were extracted as independent variables, while 0 or 1 was taken as dependent variable for crashes or noncrashes. For the purpose of searching the validity of aggregated lane traffic data from dualloop detectors of Shanghai Urban Expressway System applied to crash risk evaluation, aggregated lane traffic data and crash data were used to develop crash risk evaluation model by condition logistic regression, and the predictive performance of the model was tested. The results show that lower speed and higher volume variation crossing lanes will increase the likelihood of crash occurrence; and the aggregated lane traffic data from dualloop detectors of Shanghai Urban Expressway System can be applied to crash risk evaluation study.

Abstract:The objectives of this research were to propose Bicycle Quality of Service (BQOS) models from the users’ perspective and to develop a new BQOS criterion based on a new classification of persons. The BQOS models affecting bicyclists’ perception of safety, comfort, cleanliness, and overall quality were produced on the basis of the stepwise regression analysis. A new classification of cyclists based on cyclists’ gender, age, and cycling frequency was determined, including four classes of people. A new BQOS criterion corresponding directly to the classification of cyclists was made. Two classification figures of BQOS on main roads in the center of Shanghai were drawn as an application example. The results show that such factors as nonmotorized vehicle lane width, the separation form, the moped speed, and the proportion of roadside planting are statistically significant. It will help decisionmakers to find out the most important factors influencing cyclists’ satisfaction at road segments, and determine the sort order of the improvement works for the nonmotorized vehicle lane.

Abstract:A water quality model for the water distribution network of a town MD was established with EPANET2. Water ages of the nodes were analyzed to evaluate the water quality condition of the water supply network through the simulation. Then an optimal scheduling model based on the comprehensive node water age index was proposed and solved with genetic algorithm method. The results of application the optimal model to a county water distribution network indicate that the hydraulic optimal scheduling is able to improve the comprehensive water node age, especially for the nodes with big water demand. While for nodes with relatively small flow located at the ends of water supply network, water distribution system flushing is still necessary to ensure the .tap water quality at the end of the network.

Abstract:The numerical model of oil spill transport and fate in the Bohai Sea is set up by coupling with the hydrodynamic model. The change processes of spilled oil included in the model are drift, dispersion, evaporation, emulsification and so on. The drift process is simulated by the Lagrange method, while the turbulent dispersion process is considered by using the ‘Monte Carlo method’, turbulent dispersion of spilled oil changes over time by using the timevarying turbulent dispersion coefficient. The reasonable ranges of wind drag coefficient and the dispersion correction parameter b for Penglai 193 oil spill model obtained by calibration are 1.4~2.3% and 0.38~0.42, respectively. Then, the Penglai 193 oil spill accident in the Bohai Sea is used to verify the oil spill model by comparing the time and location of spilled oil arrival at shore, and the simulation results are consistent with the actual situation. The numerical results show that the wind, because of its large velocity and small change in direction, plays a major role on the drift of spilled oil floating on the water surface, and the drift direction of spilled oil is roughly the same with the main direction of wind. The effect of the tidal current, which is dominated by reversing current and rotary current with a very weak residual current, to the drift of spilled oil in Bohai Sea is less than the effect of the wind. The evaporation rate of spilled oil is quite large in the initial stage after oil spill, but significantly reduced in the later stage as a result of the reduction of the volatile fraction and the increase of the water content caused by emulsification. The reduction of floating oil is mainly caused by evaporation and sticking that are also the main fates of spilled oil.

Abstract:In order to improve realtime robustness of autonomous vehicle, a path tracking approach based on linear timevarying model predictive control is investigated. The longitudinal and lateral vehicle nonlinear dynamics model is established for verification of controller simulation. Starting from twowheeled model with 3 degrees of freedom (DOFs), linear timevarying path tracking predictive model is deduced. Vector relaxation factors are introduced to deal with the nonfeasible solution caused by the hard constraints in the optimization process. Based on model predictive control theory, the design of path tracking algorithm can be transformed into an online quadratic programming problem with soft constraints. Finally, both vehicle modeling and controller design are realized based on the Matlab/Simulink software, simulation results of double lane change show that the controller can adapt to robustness of different speeds and design parameters.

Abstract:In order to study the rollover control through active steerbywire system, a suitable test bench was requested. First, a hardwareintheloop experiment platform structure of active steerbywire for rollover was analyzed. The vehicle model, experiment management software and hardware platform were established. The hardware platform was composed of steering system, torque simulation loading device with magnet brake and data acquisition device. On the condition of 75° steering wheel angle of pulse test, 25° steering wheel angle of step test, 20 km?h-1 speed of Jturn test, 80 km?h-1 speed of double lane change test and 70 km?h-1 speed of snake test rollover angle of vehicle body which was used to characterize roll degree in the simulation and experiment were monitored. Results of which are close to each other. It indicates the applicability of the test bench for the rollover test.

Abstract:The experiment was conducted on a MPI boosted gasoline engine to analyze the influence of intake temperature, engine load, ignition timing and lambda on preignition frequency on the basis of the incylinder ioncurrent detection. The results show that small variation of intake pressure will not increase preignition events significantly. Higher engine load and advancing ignition timing will lead to higher preignition frequency. Incylinder enrichment will decrease its frequency but a higher fuel consumption instead. At the start of preignition event, obvious ion current signal can be detected. Compared with the cylinder pressure threshold method, ion current detection can find out all the preignition events, including the cycles with lower combustion pressure. Especially, the characteristic ion current signal of preignition can be detected 25°CA BTDC. This provides a potential control to suppress preignition events for modern engines.

Abstract:A national V emission high pressure commonrail diesel engine filled with 20% biodieseldiesel blends was optimized by adjusting the 6 injection parameters(Pfin， Tfin， Tint， Qpre， Tinta， Qafter). A multifactor global optimization plan was designed by using hybrid Design of Experiment (DoE). 9 different operating points with different speeds and torques were tested. Less data of the sample sizes were in need for a better accuracy to fit a engine Brake Specific Fuel Consumption (BSFC) model by this method. With the goal of minimum BSFC, the global best combination of injection parameters was calculated with the hybrid optimization algorithm. After the optimization， the BSFC of the biodiesel engine was lessened than before by an average of 2.71%. The hybrid Design of Experiment(DoE) method could cover the shortage of the single factor method of calibration which might cause the local optimum.

Abstract:The paper presents a review of networked software adaptive dynamic evolution technology. First, on the basis of the concept of software evolution, an analysis was made of the reason of networked software adaptive dynamic evolution. Then, comment was made of development state of networked software adaptive dynamic evolution in the requirements capturing, context modeling, perception operation, decisionmaking technology, evolution operation. In the end, the challenge and trend for the networked software adaptive dynamic evolution was pointed out.

Abstract:Aiming at such extension problem in parallel computation, this paper evaluates the key factors from parallel tasks and architecture which affect the scalability, and then models parallel tasks as well as architecture by the weighted graph. Especially, we propose the extension method of refining task granularity to realize an extension in parallel computation. The extension method transforms the graph’s structure and adjusts the weights of its nodes and edges in essence. Additionally, by further derivation, some significant conclusions about the new extension methods are drawn. Finally, the simulative experiments are conducted on the platform SimGrid to verify the effectiveness of the proposed extension methods. The results show that the new methods can realize isospeede extension in parallel computation with variable structures, which is helpful for its practical extension.