Wind-Resistant Control Research for the Main Girder of Large-Span Bridge

2012 ◽  
Vol 204-208 ◽  
pp. 2176-2182
Author(s):  
Rong Gui Liu ◽  
Qing Guo ◽  
Dong Sheng Cai ◽  
Bei Chen
Keyword(s):  
Bridge Structure ◽  
Bridge Design ◽  
Wind Resistance ◽  
Large Span ◽  
Bridge Span ◽  
Control Research ◽  
Sutong Bridge ◽  
Main Girder

With the rapid increase of the bridge span, the bridge structure tends to be more flexibility, thus causes wind-induced vibrations more prominence. Taking Sutong Bridge as an example, numerically identifies the three component coefficients of girder with different angles of attack, comparing to the girder with guide plates and the girder with central slot, it is found that the guide plates has little influence to the three component coefficients of girder and the central slot can obviously increase the wind resistance capacity of girder, provides the wind-resistant basis for girder of large-span bridge design.

Vertical Motion Inputs for Seismic Analysis of Large Span Bridge

2013 ◽  
Vol 275-277 ◽  
pp. 1403-1406
Author(s):  
Zheng Ru Tao ◽  
Xia Xin Tao
Keyword(s):  
Seismic Analysis ◽  
Three Dimensional ◽  
Low Frequency ◽  
Vertical Motion ◽  
Vertical Acceleration ◽  
Motion Field ◽  
Large Span ◽  
Acceleration Time Histories ◽  
Time Histories ◽  
Main Girder

In seismic analysis of large span bridge, inconsistent ground motions in three directions, lengthwise, lateral and vertical are required to input at the base of each of the two main girder piers. In order to adopt synthesized motion field for the inputs, a simple way to prepare the vertical motion is introduced for improvisation at this moment in this paper, since the synthesis in general consists of two parts, the low frequency ground motion calculated by a numerical method, like FEM, and the high frequency motion synthesized by random approach, and the result of the former is in three dimensional, while that of the latter has just horizontal component. The vertical acceleration time histories proposed in the paper show the way is available.

Self-Compacting and Tiny Expanding Steel Tube Concrete Using in Large Span Bridges

2014 ◽  
Vol 1004-1005 ◽  
pp. 1460-1463
Author(s):  
Xiu Li ◽  
Ming Hui Su
Keyword(s):  
Experimental Studies ◽  
High Strength ◽  
Steel Tube ◽  
The State ◽  
The Self ◽  
Bridge Structure ◽  
Large Span ◽  
Small Loss ◽  
Early Strength ◽  
Low Ability

The experimental studies on self-compacting and tiny expanding concrete filled in steel tube are introduced, which including the measurement of low ability of mixtures, the proportioning of the concrete filled in steel tube. The self-compacting and tiny expanding steel tube concrete has been applied in a large span bridge structure. The state of construction shows that the concrete have a good pump ability, a small loss of slump, a high strength early strength and a better self-compacting property.

Analysis on Reasonable Structure of Main Girder of Harp Shaped Cable-Stayed Bridge without Backstays

2011 ◽  
Vol 90-93 ◽  
pp. 1061-1068
Author(s):  
Ai Jun Chen ◽  
Guo Jing He
Keyword(s):  
Design Parameters ◽  
Bridge Design ◽  
Structure Selection ◽  
Cable Stayed Bridge ◽  
Design Philosophy ◽  
Section Design ◽  
Selection For ◽  
Main Girder ◽  
Cable Stayed Bridges

Harp shaped cable-stayed bridges without backstays are popular due to their beautiful and unique styles; they employ leaning tower columns to balance the constant and movable loads on the decks and are not provided with backstays, so they are beyond the traditional bridge design philosophy. In this paper, we discussed the reasonable structure of the main girder of Changsha Hongshan Bridge – a harp shaped cable-stayed bridge without backstays through changing the design parameters of the main girder in respect of design so as to provide important reference for design of this kind of bridges, and the research mainly related to such aspects as the structure selection for and section design of the main girder, the influence of overweight of main girder on the force on the structure, the length of non-cable area of the main girder, the span of auxiliary hole, etc.

Effect of Ground Motion Characteristics on Seismic Response of Large Span Bridge

2013 ◽  
Vol 275-277 ◽  
pp. 1407-1410
Author(s):  
Hai Ming Liu ◽  
Xia Xin Tao ◽  
Liang Wang ◽  
Shou Long Tian
Keyword(s):  
Seismic Response ◽  
Ground Motion ◽  
Earthquake Source ◽  
Maximum Response ◽  
Response Analysis ◽  
Seismic Response Analysis ◽  
Large Span ◽  
Internal Forces ◽  
Motion Characteristics ◽  
Main Girder

Result of seismic response analysis of a large span cable based bridge with inconsistent inputs is presented in a conjugated paper and is further deal with in this paper. The results from synthesized motions for the same earthquake source and same distance to the rupture show a large difference. They are compared with characteristics of the inputs in this paper. The effect of the motion amplitudes and the coherency between the input motions at the two ends of the main girder on the maximum response displacements and internal forces are pointed out.

scholarly journals Impact of subgrade and backfill stiffness on values and distribution of bending moments in integral box bridge

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Andrzej Helowicz
Keyword(s):  
Reinforced Concrete ◽  
Parametric Analysis ◽  
Bridge Structure ◽  
Bending Moments ◽  
Structural Elements ◽  
Subgrade Reaction ◽  
Bridge Design ◽  
Modulus Of Subgrade Reaction ◽  
The Impact

Abstract The article presents parametric analysis regarding the impact of subgrade and backfill stiffness on values and distribution of bending moments in the structural elements of a small integral box bridge made of cast in situ reinforced concrete. The analyzed parameters are the modulus of subgrade reaction under and behind the bridge structure (kv kh). At the beginning, the author presents the integral box bridge and selected parts of the bridge design. In particular, the author focuses on the method of modeling of the subgrade stiffness parameters under and behind the bridge structure, as well as their impact on the values and distribution of bending moments in the bridge structural elements. The bridge was designed by the author and built on the M9 motorway between the towns of Waterford and Kilcullen in Ireland. In conclusions, the author shares his knowledge and experience relating to the design of small integral bridges and culverts and puts forward recommendations as to further research on these type of structures in Poland.

scholarly journals Effects on a Nearby Bridge of Dismantling Temporary Lining During Excavation of a Shallow-Buried Rectangular Tunnel

2021 ◽  
Vol 9 ◽  
Author(s):  
Guilin Sheng ◽  
Sen Wen ◽  
Fei Wu ◽  
Shixing Liu ◽  
Zhengzheng Wang
Keyword(s):  
Large Scale ◽  
Structural Deformation ◽  
Physical Situation ◽  
Bridge Structure ◽  
Tunnel Excavation ◽  
Bridge Span ◽  
Novel Method ◽  
The Stability ◽  
Restraining Force ◽  
Rectangular Tunnel

It is almost inevitable that when a tunnel is excavated in an urban area, it will pass under an existing bridge. During tunnel excavation, a temporary lining is installed and subsequently removed. However, dismantling temporary lining may affect the stability of a nearby bridge. A numerical model was created and tests were conducted on a large-scale physical model to investigate the effects of dismantling temporary lining on a nearby bridge structure. A novel method of modeling the restraining force at the top of a pier was introduced to make the model more accurate in representing the physical situation. Analysis of the results led to the following conclusions and suggestions. 1. The process of removing temporary lining can have a significant impact on surface settlement and structural deformation of the bridge. 2. The effect of removing the second half temporary lining is greater than that of removing the first half. The key range of the tunnel where this phenomenon is principally observed contains one section of tunnel ahead (i.e., in the direction of tunnel advance) of the bridge span and the two sections to the rear. 3. A 6 m–3 m–6 m mixed dismantling method is recommended for use in the key range, and a rigid cap-connection method is proposed to counteract the considerable effects of dismantling temporary lining.

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

2012 ◽  
Vol 446-449 ◽  
pp. 1243-1247 ◽  
Author(s):  
Xing Wei Xue ◽  
Hong Yuan ◽  
Shan Qing Li
Keyword(s):  
Large Span ◽  
Continuous Rigid Frame Bridge ◽  
Structural Rigidity ◽  
Rigid Frame ◽  
Meaningful Result ◽  
Optimizing Design ◽  
Sutong Bridge ◽  
Rigid Frame Bridge ◽  
Midspan Deflection

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.

Influence of the Steel Channel Shaped Shear Connectors on the Stability of the Simply Supported Steel Bridge without the Intermediate Bracing System in the Construction Stage

2021 ◽  
Vol 879 ◽  
pp. 151-168
Author(s):  
Van Khai Nguyen ◽  
Nghia Dai Van ◽  
Van Tuong Khanh Vo ◽  
Rin Anh Nguyen ◽  
Phuc Gia Nguyen ◽  
...  
Keyword(s):  
Cross Section ◽  
Steel Plate ◽  
Moment Of Inertia ◽  
Steel Bridge ◽  
Bridge Structure ◽  
Shear Connectors ◽  
The Cross ◽  
The Stability ◽  
The Moment ◽  
Main Girder

Steel bridge structure without intermediate bracing system (IBS) has been widely used in several countries and one of them is Japan. In this type of structure, the main steel girder is not reinforced by the stiffeners. The stiffness of the main girder is enhanced with steel plate directly welded to the top flange of the main girder, forming the “beams–system”. The reinforced concrete deck slab with the set of main girder and steel plate works compositely through steel shear connectors whose shape is C (channel) or I character. As for steel bridge structures, the main role of shear connectors is shear resistance between the concrete deck slab and steel girder plate in the exploitation stage. However, previous research has shown that the density of shear connectors influences on the stability as well as the stiffness of the bridge structure. Therefore, it has approved that this appurtenance is able to not only have the ability of shear resistance but also enhance the stiffness of the steel bridge structure which is particularly surveyed with the type of especial bridge structure – the steel bridge structure without IBS. Hence, the shear connectors in this kind of bridge structure are deliberately researched as an extra role in the construction stage. The following factors of the channel shape shear connectors would be researched for evaluating their impacting level on the stability of the special steel bridge structure: the properties (the length and the moment of inertia of the cross-section) and the density on the steel plate. Through the analysis of impacting level to the stability of three mentioned factors (the length and density of the shear connectors; the moment of inertia of the cross-section), the expected result is as following: 1) The minimum density of shear connectors is proposed. 2) The influence of the moment of inertia of the cross-section, the density, and the length on the stability is quite clear. 3) As for the economy, the optimal designed range among three factors is also suggested.

Safety Control Research of Steel U Girder of Composite Bridge with Incremental Launching Construction

2011 ◽  
Vol 90-93 ◽  
pp. 926-932 ◽  
Author(s):  
Jin Feng Wang ◽  
Jian Ping Lin ◽  
Yi Fu ◽  
Yong Jiang ◽  
Jian Zeng Li ◽  
...  
Keyword(s):  
Real Time ◽  
High Efficiency ◽  
Bridge Structure ◽  
Mechanical Behaviors ◽  
Safety Control ◽  
Strain Monitoring ◽  
Safe State ◽  
Control Research ◽  
Composite Bridge ◽  
Important Significance

With both the high efficiency and economic advantages, the incremental launching has been widely used in bridge construction. As the steel U girder of the composite bridge has not formed the designed section during the launching construction, it has small stiffness relatively and poor torsion resistance ability. The structure mechanical behaviors are complex. Bridge structure collapsed during the incremental launching construction had been reported. Real-time strain monitoring of the adverse sections of the structure during the launching has important significance. By taking the Hangzhou Jiubao Bridge as background, this article introduced the real-time strain monitoring of the steel U girder and analyzed the monitoring results. Effective mastery of the safe state of the structure during launching construction was achieved. It had ensured the launching construction finished successfully. The research results can provide a reference for the design and construction of other similar engineering.

Repairing and Reinforcement of Bridge Structure

2014 ◽  
Vol 501-504 ◽  
pp. 1144-1147
Author(s):  
Xiao Han ◽  
Yan Bin Li
Keyword(s):  
Traffic Safety ◽  
Normal Operation ◽  
Bridge Structure ◽  
Normal Order ◽  
Repair Work ◽  
Damage Degree ◽  
Short Period ◽  
Testing Data ◽  
Grouting Reinforcement ◽  
Main Girder

In order to make the damaged bridges continue to play a role in a short period of time, ensure the normal order of the bridge structure is used,and ensure the traffic safety, we carried out the bridge reinforcement and repair work. On the basis of the actual testing data in combination with the practical situation of engineering and the damage degree, we damaged parts of the bridge of grouting reinforcement, embedded, anti-corrosion treatment, eliminate the hidden trouble of the structures, to guarantee the normal operation of city traffic. This article mainly introduces the harm of main girder section and the reinforced repair way.

Sign in / Sign up

Export Citation Format

Share Document