scholarly journals Vibration Response Analysis of Simply Supported Box Girder Bridge-Maglev Train in Accelerated Test of Changsha Maglev Express

2020 ◽  
Vol 2020 ◽  
pp. 1-18
Author(s):  
Xiao Liang ◽  
Tianyong Jiang ◽  
Yue Hong ◽  
Jiabing Zhang ◽  
Mai Jiang ◽  
...  
Keyword(s):  
Field Tests ◽  
Vibration Response ◽  
Response Analysis ◽  
Maglev Train ◽  
Box Girder ◽  
Low Speed ◽  
Simply Supported ◽  
Maglev Vehicle ◽  
Box Girder Bridge ◽  
Girder Bridge

In order to study and analyze the vibration response of simply supported box girder bridge-maglev vehicle, a 25 m span simply supported box girder bridge of Changsha Maglev Express was selected as the research object. Field tests were carried out to explore the dynamic response of maglev vehicle running on the bridge. Firstly, the dynamic characteristics of the bridge under the action of medium-low speed maglev train at different speeds were analyzed, and the vibration response of vehicle and bridge was studied at the design speed of 60∼130 km/h. Among them, the longitudinal acceleration of simply supported box girder ranged from 60 km/h to 130 km/h, which increased linearly with the speed of the train and reached the maximum 0.59 m/s2. Its longitudinal deflection also increased with the increase in train speed, which reached the maximum 1.605 mm at 130 km/h. When the speed is 130 km/h, the suspension gap of the maglev vehicle was concentrated in the range of 7.24∼11.50 mm. Through the test analysis, this study provides a basis for the vibration response analysis of simply supported box girder bridge-maglev train. It also provides a reference for the modification and formulation of relevant specifications and experimental verification for the acceleration work of medium-low speed maglev train in the future.

Stress Analysis of Simple-Supported Box Girder Deck Pavement under the Effect of Concrete Cushion

2015 ◽  
Vol 744-746 ◽  
pp. 827-831
Author(s):  
Hu Wang ◽  
Fei Han
Keyword(s):  
Distribution Law ◽  
Interface Shear ◽  
Eccentric Load ◽  
Element Analysis ◽  
Critical Position ◽  
Box Girder ◽  
Simply Supported ◽  
Box Girder Bridge ◽  
Girder Bridge ◽  
Transverse Slope

In order to study the stress distribution law of simply-supported box girder bridge deck pavement under the effect of triangular concrete cushion, finite element analysis program is used to analyze distribution regularity of stress among asphalt and cement concrete cushion at the thinnest thickness of concrete cushion and transverse slope degree under the action of eccentric load which is applied in the most critical position. The result indicates that the first principal stress in asphalt pavement, the interface normal tensile stress and interface shear stress will reduce when the cushion layer thickness and transverse slope degree increase, however, the thinnest thickness of cushion should not be less than 3 cm. Considering the total weight of structure, cushion thickness should not be too large either. The thinnest cushion thickness of simply supported box girder bridge pavement layer is recommended for 3-4cm while transverse slope for 2-3%.

scholarly journals The Stress-related related Damping Ratio of Box Girder with Corrugated Steel Web

2014 ◽  
Vol 8 (1) ◽  
pp. 301-306
Author(s):  
Pengfei Li ◽  
Baodong Liu ◽  
Bo Li ◽  
Minghzhe Yang
Keyword(s):  
Seismic Response ◽  
Response Spectrum ◽  
Damping Ratio ◽  
Seismic Intensity ◽  
Response Analysis ◽  
Seismic Response Analysis ◽  
Box Girder ◽  
Simply Supported ◽  
Corrugated Steel Web ◽  
Girder Bridge

In this paper, the stress-related damping ratio formula of box girder with corrugated steel webs is introduced. Using response spectrum method, an iterative algorithm is proposed to calculate the seismic response and the stress-related damping ratio under different seismic intensities. Based on a simply supported composite box girder bridge with corrugated steel webs, the stress-related damping ratios are calculated under different seismic intensities through iteration. The analysis and comparison show that the stress-related damping ratio increased with the seismic intensity, which is smaller than 0.05 under the lower seismic fortification intensity, and larger than 0.05 under the higher seismic intensity. Different damping ratios should be considered under different seismic intensities for the seismic response analysis of the bridge.

scholarly journals Seismic Design Assessment of Bridge Piers Location Effect on the Structural Capacity of Supports under Earthquake Action

2021 ◽  
Vol 11 (2) ◽  
pp. 143-153
Author(s):  
Ali Fadhil Naser ◽  
Hussam Ali Mohammed ◽  
Ayad Ali Mohammed
Keyword(s):  
Seismic Design ◽  
Longitudinal Direction ◽  
Seismic Demand ◽  
Box Girder ◽  
Design Assessment ◽  
Simply Supported ◽  
Structural Capacity ◽  
Earthquake Action ◽  
Box Girder Bridge ◽  
Girder Bridge

The objective of this study was to assess the seismic performance of two types of bridges structures under effect of earthquake by using different locations and numbers of piers. The results of D/C ratio showed that simply supported I girder bridge appeared higher structural capacity than continuous box girder bridge which was resisted the seismic demand. Continuous box girder bridge had higher seismic demand and lower structural capacity comparing with simply supported I girder bridge. Commonly, the seismic design for two types of bridges models with increasing of piers numbers was suitable to resist the earthquake action for region type B. The results of non-linear static analysis (pushover method) showed that the increasing of piers numbers had significant effects on the seismic design of bridges structures to increase the displacement capacity, force capacity, and decreasing of seismic demand to reduce the effects of earthquake action on the bridges structural members. The bridge type simply supported I girder had higher capacity in longitudinal direction than continuous box girder bridge. Whereas, for continuous box girder bridge appeared higher capacity in transverse direction than simply supported I girder. The performance points which were based on displacement were decreased with increasing the piers numbers for bridges structures supports.

Simply Supported Box Girder Bridge Vibration Control with MR-TMD

2011 ◽  
Vol 90-93 ◽  
pp. 1010-1014 ◽  
Author(s):  
Xi Jun Liu ◽  
Xiao Qin Yuan ◽  
Su Xia Zhang
Keyword(s):  
Vibration Control ◽  
High Speed ◽  
Vertical Displacement ◽  
Control Device ◽  
Vibration Acceleration ◽  
Box Girder ◽  
Simply Supported ◽  
Box Girder Bridge ◽  
Girder Bridge ◽  
Track Irregularities

MR-TMD is a new type of semi-active control device which combines with Tuned Mass Damper (TMD) and a Magnetorheological (MR) Damper. Taking German ICE3 high-speed railway train through 32meters simply supported box girder bridge for example, a dynamical model of Train-Bridge coupling vibration system is established by considering track irregularities. The relations between the bridge vibration and track irregularities with dampers are studied and the effects of vibration control with TMD and MR-TMD on the bridge are comparatively analyzed. The results show that the effects of track irregularities on vertical displacement of the bridge are relatively small, but on vibration acceleration are relatively large. As the train speed increases, the effects of track irregularities on the vibration acceleration is lager. As the track irregularities increase, the accelerations are greater. MR-TMD is able to inhibit vibration of bridge effectively, and has a wider control range and frequency bandwidth.

scholarly journals Wind tunnel measurement of aerodynamic characteristics of trains passing each other on a simply supported box girder bridge

2021 ◽  
Author(s):  
Xiaozhen Li ◽  
Yiling Tan ◽  
Xiaowei Qiu ◽  
Zhenhua Gong ◽  
Ming Wang
Keyword(s):  
Wind Tunnel ◽  
High Speed ◽  
Sudden Change ◽  
Aerodynamic Characteristics ◽  
Aerodynamic Coefficients ◽  
Box Girder ◽  
Simply Supported ◽  
Box Girder Bridge ◽  
Girder Bridge ◽  
Yaw Angle

AbstractThe aerodynamic performance of high-speed trains passing each other was investigated on a simply supported box girder bridge, with a span of 32 m, under crosswinds. The bridge and train models, modeled at a geometric scale ratio of 1:30, were used to test the aerodynamic forces of the train, with the help of a designed moving test rig in the XNJD-3 wind tunnel. The effects of wind speed, train speed, and yaw angle on the aerodynamic coefficients of the train were analyzed. The static and moving model tests were compared to demonstrate how the movement of the train influences its aerodynamic characteristics. The results show that the sheltering effect introduced by trains passing each other can cause a sudden change in force on the leeward train, which is further influenced by the wind and running speeds. Detailed analyses related to the effect of wind and train speeds on the aerodynamic coefficients were conducted. The relationship between the change in aerodynamic coefficients and yaw angle was finally described by a series of proposed fitting formulas.

Rehabilitation of the Boivre Viaduct - A Multispan Prestressed Box Girder Bridge

PCI Journal ◽  
1986 ◽  
Vol 31 (3) ◽  
pp. 22-47 ◽  
Author(s):  
Charles C. Zollman ◽  
Serge H. Barbaux
Keyword(s):  
Box Girder ◽  
Box Girder Bridge ◽  
Girder Bridge
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