Applied Mechanics and Materials Vols. 361-363

Abstract: Prestressed concrete continuous rigid frame bridge has the advantages of no expansion joints, smooth driving the advantages,however, due to cross under serious scratch,seriously affect the service life of the bridge.Take a Large span asymmetric continuous rigid frame bridge of Guizhou as engineering background,use finite element Program Midas/Civil modeling,carried out Analysis of the construction process,And select a reasonable way to Set the bridge pre-camber,and provide reasonable data for the construction of control,to ensure the bridge structure linear reasonable.

Abstract: In order to reduce the flood disaster of bridges in small and medium watersheds, a hydrology design and checking method, which was based on flow influence line, was put forward. The basic steps of this method are as follows: calibrate model by water marks and the corresponding rainfall series; calculate flow process line by loading rainfall series of design or checking frequency on calibrated model, and get design peak flow, design flood-peak stage, checking peak flow, checking flood-peak stage, etc; so hydrology design of new bridges and checking of existing bridges can be done. The results show that this method requires less parameter, and is convenient in practical application and reliable in calculation accuracy. Therefore, it is of great significance for new and existing bridges avoiding flood damages.

Abstract: PC box girder bridges with open-work webs, mechanical behaviour of which is half way between those of traditional plain web and lattice box girder, is a kind of new bridge form. As webs are not continuous, vertical force cannot travel by shearing effect in a classic way all along the deck, so the hollow web box girder designed bridge behaves very differently compared to usual plain web box girder bridges. In this paper, mechanical behavior of webs of Abrea Bridge in France was analyzed by using Ansys tool. PC box girder bridges with open-work webs have many good features such as artistic and economic, etc. It can be studied and applied further in the world.

Abstract: In the engineering background of zhijang bridge, shell finite element model of steel box girder segment was established by the ABAQUS finite element program. The transverse stress of the bridge deck was analyzed by two cases of body cable and external cable, and the transverse stress of the bridge deck caused with deadweight and vehicle load was been compared. Conclusions obtained mainly include: the transverse stress of the bridge deck induced by the four cases were not large, if lateral inclination of stay cable was not particularly large, the transverse stress of the bridge deck caused by space cable can not be given special consideration.

Abstract: In recent years, the arch tower cable-stayed bridge were widely used. 19 arch tower cable-stayed bridges built or under construction at home and abroad were investigated and summarized in design technology. Involves mainly include: span arrangement form, ratio between side span and main span, height-span ratio, the form of arch axis, structure form of tower and main girder. Research results can provide reference for the engineering designers.

Abstract: Shell element was used to simulate thin-walled piers. Mander constitutive model was adopted for analysis about the material nonlinearity. By finite displacement theory the geometric nonlinearity effect was reckoned in stability analysis based on Updated Lagrangian formulation. Nonlinear stability analysis during different construction stages indicates that the stability of pier in cantilever stage is weakest. Considered the dual non-linearity, the stability coefficient descends distinctly.

Abstract: Demonstrate the feasibility of the discrete element method application in the stone arch bridge analysis. Put forward simulation and analysis methods of stone arch bridge with fracture and damage. Using UDEC two-dimensional discrete element analysis software to establish arch bridge model, establish a load test state and simulate the overload test, make a force and damage identification via analyzing the main bearing structure arch ring. Discrete element model calculation result has good consistency with the actually measured value. Using the discrete element method can be effectively considered discrete problems of masonry materials, and accurate simulate the discrete characteristics of arch bridge structure materials.

Abstract: In this paper the concrete-filled steel tube concrete arch bridge as the research object, through the finite element program MIDAS, analyzes the internal force of the whole bridge, determined the distribution of internal force and the most unfavorable position; Using the force balance method, taking the reasonable stress of the bending moment status to control goals, determines the boom of the bridge as the condition of reasonable internal force; Use fall down method, according to the reverse sequence in order to cut the boom, each cut as a model for internal force calculation and analysis, get the next will be cut derrick's internal force, its value is the order construction boom of the initial tension.

Abstract: Vibration is a very important signal for the health monitoring of bridge. Wireless sensor network powered by batteries are widely used in the monitoring system. How to prolong the network life cycle becomes an important problem due to the limitation of battery energy. This paper presents a new method of optimal acceleration sensor placement for monitoring the vibration of bridges, the method considers network life cycle as the second target on the basis of traditional modal assurance criterion (MAC). And multiple-objective optimization is performed by using a genetic algorithm. The simulation result shows that when the sensors number is less than 30, the networks life cycle can be greatly extended with the addition of only the little cost of MAC indicators.

Abstract: This paper illustrates the calculation method of effective length factor of the high-pier of fabricated beam bridge on the basis of Eulers formula by obtaining the critical force of first-order buckling according to the stability analysis. Engineering example is applied to calculate the effective length factor in the construction stage of fabricated beam bridge. Further, parameter analysis is used to study the variation of effective length factor and the influence of dead weight, non-ideal boundary conditions, the height and the radius of high-pier on it is evaluated. Results show that: there are many influencing factors acting on the effective length factor which cannot simply be represented by a fixed value and the calculation of the effective length factor should depend on the specific conditions of high-piers.