Abstract:A new approach to the numerical simulation of compound Poisson process was proposed. The stochastic harmonic function method was adopted to generate the compound Poisson process. Based on the engineering example, the validity of the stochastic harmonic function method to simulate the compound Poisson process was verified.

Abstract:A bridge structure system, the cablearch bridge, is presented in this paper. The main feature of the structure is that the cable is anchored on the arch foot or nearby and the load is borne by the arch and the cable. The arch is both load bearing and anchored, and the cable is both load bearing and tie bar. The structure of the bridge is given, and the structural strength, the stiffness, the stability and the dynamic characteristics of the bridge are analyzed by finite element method. The results show that the stability and the strength bearing capacity of the bridge are greatly improved and the rigidity is slightly decreased compared with the tied arch bridge with the same span and cross section. In addition, the cablearch bridge is easier to achieve the unity of force and beauty, and its high stability provides a new effective way to improve the span of arch structure.

Abstract:The finite element model of a cablestayed bridge with the main span of 420 m was built with OpenSees software. Fragility analysis was performed under four conditions considering incoherence effect only, incoherence and wavepassage effects, incoherence and siteresponse effects and spatial variation due to incoherence, wavepassage and siteresponse effects. System fragility curves were generated combining joint probabilistic seismic demand model (JPSDM) with Monte Carlo simulation based on component fragility. The system vulnerability of the cablestayed bridge under nonuniform excitation considering different sources of spatial variation effects is higher than that under uniform excitation. The effects of incoherence and siteresponse are obvious to the seismic response of the cablestayed bridge. With the increase of incoherence factor, the bridge as a system becomes more fragile. The siteresponse effect is more complicated, and the bridge tends to be more vulnerable if the soil types of nearby exciting locations become more different. The vulnerability of the cablestayed bridge increases when the soil type along the direction of propagation turns from relative soft to firm than the inverse condition. Neglecting wavepassage effect in fragility analysis would not cause an obvious error. Above all, incoherence and siteresponse effects should be considered in the fragility analysis of the floating cablestayed bridge under nonuniform excitation. The widely adopted fragility analysis under uniform excitation at the current time overestimates the aseismic behavior of the system.

Abstract:Six reinforced concrete (RC) beams were fabricated and exposed to fire in accordance with the international standards ISO834 temperature curve, and five of which were retrofitted employing the bolted sideplating (BSP) technique, then all the specimens were tested under fourpoint bending. The influence of the plate depth and thickness, the bolt spacing, and the arrangement of steelangle stiffeners on the strength, stiffness and ductility of the specimens was investigated. The results indicate that the flexural bearing capacity and the stiffness of all the firedamaged specimens were significantly improved by the BSP technique, but the variation of ductility was highly dependent on the arrangement of strengthening. The strengthening effect increased with the increase of plate thickness and the decrease of bolt spacing, and the local buckling of the bolted steel plates could be restrained effectively by the implementation of the steelangle stiffeners. The degree of partial interaction between the bolted steel plates and the RC beam could be enhanced considerably by limiting the relative slips on the steelconcrete interface and the local buckling of the bolted steel plates.

Abstract:A new type of connection with slottedin steel plates and steel end plate was proposed for glued laminated timber structures. Experiments on new connections with different thicknesses of steel end plates and a bolted connection with slottedin steel plates were conducted under low cyclic reversed loading. The results show that the new type connection makes progress in ductility and energy dissipation. Conclusions can also be obtained that there are close correlations between the thickness of the end plate and the performance of the new type connection. A formula for the yield load of the end plate connections was deduced based on virtual work principle. Three failure modes of the new type of connection were analyzed and the bearing capacity formulas for each mode were deduced. The calculation results of the formulas agree well with those of the experiments. Several suggestions for the selection of the end plate thickness are given.

Abstract:As a common phenomenon of groundwater in shallow soil layers, the cyclic risefall of water table usually causes the change of soil structure and properties, having impacts on the deformation and subsidence of foundations. In order to solve the above problems, this paper takes the silt in Luoyang area as the research object for the model test, and studies the periodic variation law of pore water pressure and earth pressure in different layers of silt at different stages under the action of cyclic risefall of water table. Based on the above exploration, the arising settlement deformation can be studied. The results show that the periodic change of pore pressure is the main reason of the periodic deformation of silt, and the variation laws have the similarity. The pore water pressure responses instantaneously with the cyclic risefall of water table while the variation of deformation shows the hysteresis. The oscillating pore water pressure is the primary cause of the saturationunsaturated state transition in the silt and the dissipation of the residual pore water pressure is the driving force of the settlement deformation.

Abstract:A practical method for calculating the consolidation settlement of frictional piled raft foundation in deep clay was presented. Nonlinear model considering pilesoilraft interaction and alternating direction implicit finite difference algorithm were adopted to solve excess pore water pressures at different positions in twodimensional plain strain domain, average consolidation degree of soil below pile tip and consolidation settlement of piled raft in any time. The results from comparison with the accurate solution of finite element method show that the proposed model and the simplified assumptions are basically reasonable. Finally the method was successfully applied to the consolidation settlement prediction of two pile raft cases in saturated clay.

Abstract:In this paper, we establish an activitybased behavioral model for a specific flexible working arrangement (FWA) which is composed of core and flexible working times. The proposed behavioral model is distinguished from the traditional model with flexible parameters. Both analytical and simulationbased approaches are employed to analyze the impacts of FWA with different percentages of flexicommuters on the departure patterns and delays. The results show that FWA has positive effects on relieving congestion. The average travel time decreases with the increasing percentages of flexicommuters, especially for fixedtime commuters. However, the effects diminish gradually.

Abstract:A novel method aiming at analyzing the effect of dedicated bus lanes (DBLs) in improving bus operation performance based on secondary speed difference concept was proposed. With global positioning system (GPS) data of buses and cabs, stop data and road segment data from 54 roads in Shenzhen City, we analyzed the speed characteristics of DBLs on major urban roads in Shenzhen City, characterized the quantified effect of DBLs using the secondary speed difference of bus and cab with the bias of vehicle travelling difference and bus stop eliminated, and verified the significance level of this effect. The results show that DBL brings a remarkable effect on secondary speed difference while factors including bus stop density, bus stop form and bus stop location do not; DBL is effective in improving bus operation performance, the using of DBL will significantly reduce the speed difference between bus and other vehicles, thereafter improves operation efficiency, however some of DBLs are not effective.

Abstract:In this paper, we analyze bicycles’ maneuvers in 113 mopedpassingbicycle events collected from shared bicycle path in Shanghai. By analyzing trajectories of both overtaking mopeds and overtaken bicycles, we propose an indicator of overtaking interference for mopeds. This indicator describes the speed difference as well as the overtaking distance, between the moped and the bicycle. The results show that when the indicator of overtaking interference exceeds a critical value, the overtaken bicycle’s acceleration volatility at lateral direction will significantly decrease. However, the overtaken interference has its marginal utility, which means when the overtaken interference continually increases, the decrease rate for the lateral acceleration volatility of overtaken bicycles will decrease. The Kmeans++ model is used to classify the overtaking interference and the further results show that when bicycle lane width is between 1.1 m and 1.3 m, meanwhile a 25 km?h-1 posted speed for mopeds is taken, the severe overtaking interference could be limited.

Abstract:Municipal solid waste incineration (MSWI) bottom ash powder (BAP) was used to replace (100% by mass) natural limestone powder in asphalt mixture, and its feasibility and effect on properties were discussed. Based on the designing of asphalt mixture proportion, the effect of BAP on design asphalt content and Marshall index was also studied. Pavement performance of asphalt mixture with BAP was investigated by room testing. The results show that the design asphalt content and the Marshall stability will increase because of the use of BAP. The high temperature stability of asphalt mixture with BAP increases benefitting from its rough and porous surface. The increasing of asphalt content and extruding structure can improve the low temperature crack resistance of asphalt mixture with BAP. Rather, the water stability decreases a little because BAP contains some SiO2 and metal oxides, but the infiltration and adhesion between asphalt and BAP is better.

Abstract:Under the effect of other external variables, the fluctuation rule of pavement temperature with time was excavated in the future. Based on the historical data of a traffic meteorological monitoring station, the main affecting factors of pavement temperature were determined, and the shortimpending prediction model of pavement temperature time series was established by applying autoregressive integrated moving average (ARIMA) model in order to predict pavement temperature in a short time. The results show that the predicted average accuracy reaches 81.25% and 99.65% respectively within allowable error range of ±0.5 ℃ and ±1.0 ℃ in the next 3 h. The predicted average accuracy and the mean absolute error are up to 92.50% and 0.15 ℃ respectively within allowable error range of ±0.5 ℃ in the next 1 h.

Abstract:A path following control method based on fuzzy algorithm was proposed to improve the unmanned vibratory roller’s operation quality that was influenced by the path following error during automatic vibration rolling. The kinematic model of the vibratory roller as well as the hydraulic power steering model was developed. The heading following algorithm based on the lookahead scheme and the fuzzy proportionintegralderivative (PID) controller was designed to control the automatic rolling error. The simulation of the path following control model and the field automatically rolling experiments verified the control performances of the automatic rolling for the unmanned vibratory roller. The results show that the heading following fuzzy PID control algorithm based on the lookahead scheme has better control performances than the conventional PID algorithm and prove the effectiveness and superiority of the fuzzy control algorithm in the unmanned vibration rolling.

Abstract:In multiproduct mixed flexible manufacturing cell, the number of automated guided vehicles (AGVs) and their routings will directly affect the cell’s efficiency. Considering the constraints such as processing time, batch requirement and facility location, a mathematical model was built aimed at minimizing the handling time of AGVs. To cooptimize the number of AGVs and their schedulings under different distributions of manufacturing tasks, an improved Memetic algorithm was proposed with the adjustment of coding and search mechanism, which effectively avoids the problem that conventional crossovers easily result in illegal solutions and the optimized AGV routing is also obtained. At last, a case study is illustrated to prove the validity of the proposed method.

Abstract:In this paper, the dynamic process of contaminated air intruding from the corridor into the isolation room was studied and the air intrusion volume was determined. The Reynolds average NavierStrokes(RANS) model was applied for the numerical simulation, and the movement of a door and a person in the simulation was achieved through the dynamic mesh techniques. The results show that the air intrusion process induced by the movement of the door and the person can be divided into four stages, and with longer entrance time the air intrusion volume would increase significantly.

Abstract:The mining process of granular materials is a complex nonlinear dynamic problem, thus the optimization of bucket grab problem is difficult to achieve due to the uncertainty of dynamic equilibrium equation. This paper takes the coal mine scissor bucket grab as an example. Firstly, we establish the mathematical model of grab to obtain the mining performance data samples in different design parameters. Then, we construct threefactor and fivelevel orthogonal test to establish the quadratic polynomial response surface model of the optimization function of granular material mining performance, and solve the undetermined coefficient vectors of response surface model by the least square method. Finally, we obtain a better performance product by optimizing geometric parameters of the grab based on the ideal point method of multiobjective optimization. The results show that the proposed method has good predictive ability, and greatly reduces the scale of simulation calculation by comparing with the results of Monte Carlo method.

Abstract:Based on the cooling module of a sedan, five different matrix fan configurations were designed, and a numerical analysis of the effect of the different configurations and the nonuniformity of cooling air mass flow on the heat rejection performance was processed. The results indicate that the matrix fan can increase the synergy number of the temperature difference between the cold and hot medium in radiator, with which the heat dissipation has a positive correlation. As the cooling air flow through the radiator becomes nonuniformity, the heat rejection of radiator decreases. And with the increase of rotational speed ratio, the decreasing amplitude gradually descends. Moreover, the changes of cooling air mass flow in the different regions have different weight factors on the heat rejection performance of radiator, i.e., when the cooling air mass flow in the low temperature region is bigger, correspondingly the decreasing amplitude of the heat dissipation and synergy number rises.

Abstract:The purification performance and deterioration rule of catalyzed diesel particulate filter (CDPF) with different precious metal loads (25, 20, 10 g?ft-3) on the exhaust emissions of bus was studied and analyzed based on portable emission measurement system(PEMS). The results show that the more the precious metal load on CDPF, the better the purification performance on CO, total hydrocarbon (THC), PN (particle number) and PM (particle mass) is. With the increase of the use time, the purification efficiency of CDPF decreases in the form of logarithmic and the more the precious metal load, the slower the purification efficiency decrease is. After using for 50 thousand kilometers, CDPF with 25 g?ft-3 precious metal load can still keep purification efficiency about 74% and 70% for CO and THC respectively, and more than 90% for PN and PM. The precious metal loads and using mileage has no effects on the NOx emission of buses. CDPF with 20 g?ft-3 precious metal load is the best choice considering both the cost and the performance.

Abstract:Based on water phase change and water transport phenomenon during gas purge in proton exchange membrane fuel cell (PEMFC), a onedimensional water transport model during gas purge is developed to investigate the effect of two important factors, i.e., stack temperature and gas flow rate on the purge effectiveness. The impact of hydrogen or oxygen as anode purge gas is also compared. The simulation results show that the backdiffusion from cathode to anode is significant during initial gas purge and the impact of stack temperature is much greater than flow rate. It is efficient to use oxygen as purge gas in anode.

Abstract:In this paper, a selflocation method is proposed. Constrained by the coordinates of control points, the parameters of selflocation are solved by LevenbergMarquardt algorithm which is a nonlinear least square method. Taking the example of double transmitters, the solution model of the selflocation method is introduced in detail. By the experiment, it is verified that the selflocation method is feasible, the solution model is effective and the accuracy of selflocation can meet the requirements of engineering survey.

Abstract:A method of ship detection in highresolution remote sensing images using mixture of deformable part models(DPMs) is proposed in this paper. The method is robust to size difference by constructing multiscale histogram of oriented gradients (HOG) feature pyramids. Deformable part models are introduced to deal with the deformation of the key parts of ships. And a sliding window detection strategy is adopted to separate the clustered ships. Considering that HOG features are orientationsensitive, improved training and detection methods are also proposed. In the training phase, all the samples are rotated to the same direction for parameter learning to reduce the number of templates. In the detection phase, the regions of interest are rotated to a specific direction to implement template matching. The experiments of ship detection in GaoFen2 highresolution remote sensing images are carried out. It is shown that the proposed method is effective.