Papers by Author: Xian Wu Hao

Abstract: With the background of continuous rigid frame bridge,this paper considers the impact of the structural weight and the pre-stressed force in the construction phase,uses the ANSYS finite element analysis program to analyze the stress and strain of an continuous rigid frame bridge in the the largest cantilever state, focuses on different effects of the different radius of curvature and pier height.Through the analysis constructs the control mentality and the corresponding design proposal for the continuous rigid frame bridge had been provided.

Abstract: Concrete filled steel tubular is a steel-concrete composite material. Its stiffness is reasonable or not will affect the accuracy of the internal force and deformation. Based on the two mixed material stiffness calculation theory that superposition theory and unified theory, a conversion stiffness formula list recommended by domestic and international codes and researchers was derived. By matlab program, the ratio between combination stiffness and conversion stiffness was calculated, and the relation curves between the stiffness ratio and parameters including steel grade, concrete grade and steel ratio were obtained. A conclusion is drawn: for the concrete filled steel tubular structure, we can calculate the conversion stiffness first, then by the combination stiffness and conversion stiffness ratio, so as to obtain the combination stiffness. In practical engineering applications, the combination stiffness is more in line with the mechanical characteristic of the composite structure, and the calculation results are more closer to the actual situation.

Abstract: with the continuous development of bridge engineering，the massive concrete has been widely used in large-scale bridge foundation engineering. But it often has the problems of crack and deformation, which infuenced the entirety and durability of the whole structure seriously. In this paper, a hydration heat analysis of the platform of a corrugated steel webs bridge is carried out by using MIDAS/Civil structure finite element method analysis program, the analysis summarizes the temperature distribution regulation of platform concrete influenced by hydration heat and the temperature changing regulation affected by time. Meanwhile, some countermeasures of preventing the crack of concrete are put forward.

Abstract: According to the design specifications and structure theories of prestressed steel-concrete composite box girder, a mathematical model of optimization of cross-section of prestressed steel-concrete composite box girder was established. The nonlinear constrained optimization was adopted and the computer program was compiled with Matlab language. The efficiency optimization was achieved in the optimization design of the two different span bridge cross-section of a simply supported steel-concrete composite box girder. Numerical result illustrated that the optimization mathematical model of optimization was exact and the algorithm effective.

Abstract: In order to study the influence of shear lag effect of single box and double cell box girder on structure，to make the rigid frame continuous bridge of Wei River grand bridge as the research object, through the establishment of finite element model, the normal stress and shear lag coefficient of the control sections in various working conditions is calculated, and the distribution of the box girder normal stress under shear lag effect is obtained.

Abstract: The bridge health monitoring system can collect large amounts of data, but it lacks the trend analysis of monitoring data. This article introduced the method of Time series analysis into the analysis of bridge monitoring data, and adopted ARIMA model in time series analysis of monitoring data, used the least square method for parameter estimation, established the prediction model for bridge deflection, and conducted the goodness of fit test. Take the actual bridge monitoring data as an example, it was demonstrated that the method is feasible in the prediction of bridge condition trend.

Abstract: By the force analysis of continuous rigid frame bridge girder, the depth-span ratio’s influence on the structure in load carrying was studied, the relationship between the depth-span ratio and prestressing force required by structure was established, and using the sectional force of girder in the construction and utilization of the bridge as the constraint, with the application of grid search method and the construction case of Ziyang bridge, we carried out the optimization of design on the depth-span ratio for continuous rigid frame bridge girder.