Applied Mechanics and Materials Vols. 587-589

Abstract: Choosing bus as the research object, the aerodynamic characteristics of bus in the coupling of wind-vehicle-bridge system were analyzed by CFD (Computational Fluid Dynamics) numerical algorithm. The variations of state coefficients of bus along with wind yaw angles were simulated when a bus in the different lateral locations of steel box-girder bridge and the minimum critical wind speed was calculated when a bus overturning or sideslip in four different lanes on the bridge.

Abstract: Liangjiang Great Bridge is the prestressed concrete continuous rigid frame bridge with high pier and long-span. It adopts the segmented cantilever construction method. The process of its construction is the key to the construction control simulation analysis. In this paper, based on the characteristics of the bridge construction, finite element method is used to establish the simulation model. Cantilever construction stages and closure stages of bridge are simulated and analyzed. The structure deflection diagrams in the each section construction and the later construction considering the creep and shrinkage of concrete are obtained. The initial camber of each segment is given in the construction. The stress characteristics of key section are analyzed in the construction process. It provides a basis for monitoring and on-site construction of bridge and the reference for similar bridge construction.

Abstract: Concerning the design and the construction of the Nantang River bridge in Wenzhou, this paper mainly mention the problems about the the below model without wind bracing tied-arch bridge which should be taken notice of. The certain method of the tension in suspenders has been analyzed, and the advice of the design and construction of such kind of bridge has been proposed as well.

Abstract: In this paper, take one steel-concrete composite beam bridge in alpine region as the research object, by using the calculation model of “line-bridge-pier”integration, research the distribution law of rail additional contractility, deflection force and values of broken gap when rail is breaking. Propose the key techniques of laying temperature stress CWR on composite beam bridge, which will have great significance in guiding the design of similar projects.

Abstract: Because of T-type rigid frame bridge pier top cast segments’ structure is complex,embedded parts,steel,each prestressing tendons and it’s channels,anchorage intensive staggered,force complex,greater difficulty of construction.So select the construction plan is very important,the quality of the program will directly affect the progress of the construction and the quality of construction. There are many options of stent design,most used is attached to the cantilever bracket.In this paper, several commonly used form of stent were introduced.

Abstract: Since the main beams of a prestressed concrete hollow slab beam Highway Bridge stored for too long, in order to assess its bearing capacity, static loading test and bearing capacity evaluation of single beam was conducted. The hollow slab beam at the locations where the transverse distribution coefficient is biggest was chose for testing, and the transverse distribution coefficient at midspans of the slab beam was calculated by the hinged slab method. By comparing the theoretical and measured values of displacement and stain at key points of the beam, structural performance of the beam was finally evaluated. The test results showed that both the strength and stiffness of the beam was conforming to the requirements of the specification and able to satisfy normal use requirements in serviceability limit state.

Abstract: This paper made summary and analysis of the common stone arch bridge reinforcing techniques, researched their mechanism and the principles of choosing strengthening method. Given some practical suggestions on the choice and design about arch bridge reinforcing scheme.

Abstract: Subway is usually one of the largest infrastructure in the city, is also the arteries of urban passenger transportation, and urban lifeline. The subway operation safety problem has become the primary problem in metro operation. This paper presents a new method for decision support operational risk evaluation of subway. This new method not only can evaluate the subway operation safety, but also can be safety in subway operation management in weak links, to ensure the subway operation safety.

Abstract: In order to study the capacity of stairway in urban rail transit hubs, pedestrian flow and density were collected by the survey of upward stairway and downward stairway in Beijing Xizhimen rail transit hub. With the survey data, this paper fits flow-density curves and establishes corresponding function models. Based on the traffic flow theory, it calculates the actual capacity of upward stairway and downward stairway, and makes a contrast with the Code for Metro Design. Furthermore, the suggested design capacity of stairway is given based on the level of service. The results will provide references for the design of stairway in urban rail transit hubs.

Abstract: Chinese high-speed railway is in a boom and making train diagram with high-density trains to relieve capacity intense and improve operational efficiency has become the research focus. Different kinds of station intervals between adjacent trains are the basis for the train diagram. According to the situation in which trains with different speed run on the same line and the proportion of high-speed trains is much larger than that of middle-speed trains, this paper raises principles and methods to determine the minimum departure interval between trains with same speed at the relatively initial station. The minimum departure interval between trains with same speed at the relatively initial station is a necessary and sufficient condition for making train diagram since there is no overtaking between same-speed trains.