Span Continuous Rigid Frame Bridge Research Articles

A Study on Analysis of Long Span Continuous Rigid Frame Bridge

A case study of a large span pre-stressed concrete continuous rigid frame bridge (Ba-Mao-Chong bridge) of GUI DU high speed railway. Finite element program Midas/Civil is used to simulate the construction process and operation phase, the influence of concrete overweight, pre-stressing loss, concrete shrinkage and creep, stiffness loss and other factors that related the long-term deflection of bridge are analyzed. The calculation results show that: (1) The overweight concrete and Bridge deck pavement construction error could cause the bridge long-term deflection increases. (2) The creep coefficient, environment humidity, and other factors on the bridge have significantly influence on long-term mid-span deflection, (3) The beam stiffness reduction could lead to the bridge long-term mid-span deflection increase.

Effect of Concrete Creep on the displacement of single tower single cable plane Extradosed Cable-stayed Bridge

Extradossed Cable-stayed Bridge is both cable-stayed Bridge and Continuous rigid frame bridge mechanics feature, Beam is the main force components, cable is supplement.This article combined with a single tower and single cable plane Extradossed cable-stayed bridge in Yunnan, use different creep calculation models and analysis deflection caused by creep effects. The results showing that deflection caused by creep effect is smaller than the same span continuous rigid frame bridge, the value is about 2cm. On the other hand the deflection is increasing with ambient humidity decreases, therefore in the dry environment the calculation model is relatively large in the pre-camber. In the choice of RC creep model is significant in the dry areas.

贵都高速大跨径连续刚构桥——石门坎大桥长期挠度监测分析

贵都高速大跨径连续刚构桥——石门坎大桥长期挠度监测分析

Prestress Loss Test and Analysis of Long Span Continuous Rigid Frame Bridge

Prestress loss has a great influence on working performance of bridge structure, which is concerned highly by the engineers. In this paper, based on a large span continuous rigid frame bridge, the prestress change during the construction and prestress loss after closure is tested and analyzed by laying the magnetic flux sensor. The test and calculation results show that during segmental cantilever construction process, the measured values is very close to the theoretical value, indicating that the magnetic sensor is reliable. After the whole bridge is closed, the prestress value of T10, D6 and D2’ decreases with time, and the change trend is basically the same for 150 consecutive days for which have no any construction work on the bridge deck. This result has a high reference value for the design and construction of long-span prestressed continuous beam (rigid) bridge.

Analysis and Research on Displacement Monitoring of Operating Period of Large Span Continuous Rigid Frame Bridge

Analysis and Research on Displacement Monitoring of Operating Period of Large Span Continuous Rigid Frame Bridge

Analytical Research on Deformation Monitoring of Large Span Continuous Rigid Frame Bridge during Operation

Based on a large span continuous rigid frame bridge in Chongqing of China, the main pier vertical displacement and deviation, the bridge deck alignment and the expansion joint deformation are analytically researched during operation. Firstly, the monitoring content and method of the large span continuous rigid frame bridge are clearly stated. Secondly, by finite element software Midas Civil, the relevant deformation values of the bridge are calculated. Thirdly, in practice, the relevant deformation values of the bridge are measured. Finally, the measured values in practice are compared with the calculated ones by the finite element software Midas Civil, finding that the former is less than the latter, and it can be concluded that the bridge is basically in the normal working condition. In this paper, the analytical research on the deformation monitoring can provide the basis for similar bridges, which has good practical significance.

The Key Construction Techniques of Long Span Continuous Rigid Frame Bridge of the Expressway in Mountain Areas

At present, long span continuous rigid frame bridge is widely used in the expressway in mountain areas. Mountain areas have the features of terrain with continuous ridges and peaks, crisscross network of ravines, changeable climate and large temperature difference between day and night, while continuous rigid frame bridge of the expressway in mountain areas usually has long pile foundation, great bulk of bearing platform, high main pier and long span, which all increase the construction difficulty of long span continuous rigid frame bridge of the expressway in mountain areas. This paper will take the construction process of Longtan River Bridge built in Hurong Xi highway in Hubei province as an example, to study and discuss the key construction techniques of long span continuous rigid frame bridge of the expressway in mountain areas.

Studies on the Mechanical Performance of Long Span Continuous Rigid Frame Bridge under the Influences of Different Curvature Radius

The effect of curvature radius on the mechanical properties of continuous rigid frame bridge with high pier and long span is studied in this paper. Taking the Wayaobao Bridge as the research object, the models including both of the linear rigid frame bridge and the different radius of curvature rigid frame bridge are established by using the finite element software MIDAS/Civil, and the mechanical properties of the finished stage are analyzed, and the influence of the radius of curvature on the deformation and internal force of continuous rigid frame bridge are researched. The alteration in curvature radius almost had no influence on the bridge vertical displacement, vertical bending moment. The tangential displacement gradually become smaller, but little change with the decrease of bridge’s curvature radius.The radial displacement, transverse bending moment, torque of the bridge increased with the decrease of bridge’s curvature radius.The force and deformation of the bridge structure are more unfavorable with the decrease of bridge's curvature radius. The study can provide some suggestions for design and construction control of curved frame bridge.

Calculation and Analysis of Continuous Welded Rail on Continuous Rigid Frame Bridge

At present, China's large span continuous rigid frame bridge (CRFB) has made rapid development, and has been applied in the railway bridges. This paper based on finite element analysis software ANSYS, using the simplified algorithm, establish a line - bridge - pier integration model for calculation of continuous welded rail (CWR) on bridge, the continuous rigid bridge and continuous rigid frame bridge (CGB) in two different conditions were compared and analyzed. The calculation results show that: the rail expansion force, bending force, braking force, rail broken gap of CRFB are smaller than that of the CGB of same beam span, in CWR, CRFB has obvious advantages, it should be popularized.; equivalent temperature span of CRFB are smaller than that of the CGB of same beam span, so the CRFB is less affected by the temperature; because of the pier and girder consolidation of CRFB, favorable to CWR, but due to the bending effect of bridge piers can lead to beam produces larger vertical deformation, thus affecting the track smoothness, which must be noticed in design.

Dynamic Buffeting Response Analysis of High Pier and Long Span Continuous Rigid Frame Bridge with Stochastic Wind Field

The fluctuating wind field is simulated for digital by using the stationary Gauss processes, which Kaimal spectrum and Panofsky spectrum is used to the simulation of wind target spectrum with different direction and speed. According to Davenport quasi-steady buffeting force model formula, the time-history of wind velocity is converted to Buffeting force time history, which are applied to the Structure model node, combined with ANSYS for long-span continuous rigid frame bridge buffeting response analysis dynamic simulation.Taking a high pier and long span continuous rigid frame bridge as an example, analyzes dynamic buffeting response of the bridge under the action of the stochastic wind field, which as the guidance of high pier and long span continuous rigid frame bridge design work, practice has proved that the method is simple, reliable, also can be a way that dynamic analysis of buffeting response of large span bridge or tower structure under the action of stochastic wind field.

Study on Optimizing Design of Structural Rigidity of Super-Large Span Continuous Rigid Frame Bridge Using ANSYS

In this paper, the situation of the midspan deflection of the span continuous rigid frame bridge is described, and the cause of the deflection is explained. It may be caused by the problem of the rigidity. Then the ANSYS is used to conduct analysis. The deflection of the biggest cantilever of the rigid frame bridge is the controlled target, and the optimizing design of the Sutong bridge is conducted. A meaningful result is obtained, and it provides a basis of the choice of the height of beams.

Study on Optimizing Design of Structural Rigidity of Super-Large Span Continuous Rigid Frame Bridge Using ANSYS

In this paper, the situation of the midspan deflection of the span continuous rigid frame bridge is described, and the cause of the deflection is explained. It may be caused by the problem of the rigidity. Then the ANSYS is used to conduct analysis. The deflection of the biggest cantilever of the rigid frame bridge is the controlled target, and the optimizing design of the Sutong bridge is conducted. A meaningful result is obtained, and it provides a basis of the choice of the height of beams.

Temperature Field Test and Research of Box-Pier and Box-Girder for Long Span Continuous Rigid Frame Bridge

Longtan River Bridge, which the length of the main span is 200m and the height of the main pier is 178m, is a long span continuous rigid frame bridge. Temperature field of the box-pier and the box-girder due to solar radiation were measured. Regression analysis of the temperature difference has been done by using the least square method, and the fitting curve of the vertical and the transverse non-linear temperature difference distribution of box-pier and box-girder are obtained in this paper

The Study of Aseismatic Performance of Continuous Rigid-Frame Bridge

The aseismatic performance of long span continuous rigid-frame bridge is an important but difficult research topic. To explore the impact of pier height and reinforcement ratio on long span continuous rigid-frame bridge’s aseismatic performance, Midas/Civil bridge Finite Element program is used to construct the three-dimensional model of a continuous rigid-frame bridge in this research. Fiber element and plastic hinge are used in pier simulation. Through the adjustment of pier height and ratio of reinforcement, the internal force, displacement and plastic rotation of bridge pier’s critical sections are analyzed under the action of seismic loading. Thereby, the impact of pier height and plastic hinge on such bridge’s aseismatic performance is obtained. It is shown that: maximum displacement, bending moment and plastic rotation increase at pier cap with pier height, indicating that pier height has strong impact on seismic response. And with increasing reinforcement ratio, the bending moment and yielding moment at pier cap and base both increase. Therefore, suitable pier height and reinforcement ratio should be selected for better aseismatic performance.

Study on Rapid Closure Technology of Long Span Continuous Rigid Frame Bridge

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.