On the basis of analyzing the necessary, such as the bridge monitoring data management, safety state evaluation, evaluation opinions and etc , this paper designs a remote monitoring and assessment system (BRMAS)with the parametric, intelligent and modular design thought, and applicates object-oriented software Microsoft VC++ to developt BRMAS system, which gives a system structure, function module and evaluation model. Through applying the design scheme and developed software into a highway bridge management, applications indicated that BRMAS system is very maneuverable, and realize the modern information management of bridges.
The aerodynamic force coefficients of road vehicles under wind loads depend on not only the shapes of vehicles but also those of infrastructures, such as a bridge. Therefore, study of the aerodynamic characteristics of road vehicles considering the interaction of aerodynamic forces between the road vehicles and bridge is necessary for predicting the performance of vehicle under wind loads properly. This paper studies aerodynamic characteristics of road vehicles when vehicles run on bridges under cross winds using the CFD method. The dependence of aerodynamic forces on vehicle speeds, the interaction of aerodynamic forces between the vehicles and bridges and the influence of the turbulence are investigated by different simulation cases.
The choice of closure order of long span prestressed concrete continuous rigid frame bridge is the key part on its construction procedure, which has a big influence on the gross force and alignent of the whole structure. On the Basis of the Hanjiang bridge, the paper studies the closure order of long span prestressed concrete continuous rigid frame bridge and its system transformation procedure as well as the effect of jacking force etc. It shows that the technique of the midspan and the sidespan close at the same time not only meets the requirement of allowable internal force, but also has the benefit of shorten the construction period as well as reducing the degree of construction difficulty.
A lot of existing reinforced concrete girder bridges appeared cracks in the service phase. Because of the beam's cracks existing, the sectional bending stiffness of the beam decreased. It would reduce the structure's bearing capacity, so the bridges' structure performance urgently needs to be assessed by effective methods, so as to study further measures. In this paper, based on the indoor model test results of four pieces of model beams, regression analysis of the crack characteristics parameters and test's load-displacement curves has been carried out. The relationship between crack characteristics parameters and girder bridge's bending stiffness has been established. The qualitative assessment of structure crack's appearance inspection is transmitted to quantitative assessment, so it will make the assessment more objective and scientific.
Concrete is used in tower, and steel is used in anchor zone. It can make full use of the two materials’ nature. It can not only satisfy the tower’s stressed aptitude, but also can reduce the cost of construction. In this paper, the full size model has been designed and constructed. The test investigation of the statical performance have been proceeded. The results show that the neotype anchor system can make full use of the materials’ nature and is in good working order. The anchor system with enough bearing capacity satisfies the operating requiements of the cable-stayed bridge.
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