scholarly journals Refined Calculation and Demonstration for Sunshine Temperature Difference Effect of Long Span Continuous Beam

2021 ◽  
Vol 791 (1) ◽  
pp. 012131
Author(s):  
Jia Peiliang
Keyword(s):  
Temperature Difference ◽  
Continuous Beam ◽  
Long Span ◽  
Refined Calculation ◽  
Difference Effect

Seismic Performance Analysis of a Multi-Span Continuous Girder Bridge under Multi-Excitation

2013 ◽  
Vol 540 ◽  
pp. 141-152
Author(s):  
Hang Sun ◽  
De Jun Wang ◽  
Yong Li
Keyword(s):  
Seismic Response ◽  
Time History ◽  
Response Analysis ◽  
Continuous Beam ◽  
Space Correlation ◽  
Long Span Bridges ◽  
Girder Bridges ◽  
Long Span ◽  
Continuous Girder Bridge ◽  
Simple Support

Although the seismic response analysis under the multi-excitation was widely focused on the long-span flexible bridges, it is still necessary to pay more attention to this point of continuous girder bridges since the dynamic behavior of this type of bridges are different with either long-span bridges or simple support bridges. Based on the nonlinear dynamic time history analysis, a four-span continuous beam FEM was built, and the effect of excitation types and structure size on seismic response was studied. And results indicate that the structural performance of continuous girder bridges is sensitive with the space correlation of different location of seismic excitation. So its necessary to consider the space effect of excitation while carrying out a seismic design of continuous beam.

scholarly journals Appropriate Matching Locations of Rail Expansion Regulator and Fixed Bearing of Continuous Beam Considering the Temperature Change of Bridge

2020 ◽  
Vol 10 (17) ◽  
pp. 6046
Author(s):  
Ping Lou ◽  
Te Li ◽  
Xinde Huang ◽  
Ganggui Huang ◽  
Bin Yan
Keyword(s):  
Temperature Change ◽  
Element Model ◽  
Continuous Beam ◽  
Fixed Bearing ◽  
Effective Measure ◽  
Long Span ◽  
Continuous Beams ◽  
Additional Force ◽  
Continuously Welded Rail ◽  
Nonlinear Finite Element Model

Due to the temperature change of bridges, there is a great additional force in continuously welded rails on continuous bridges. Laying rail expansion regulators is an effective measure to reduce the additional force. The nonlinear finite element model is presented for a continuously welded rail track with a rail expansion regulator resting on the embankment and simple and continuous beams, considering the temperature change of the bridge. Then, a method is proposed to determine the locations of the rail expansion regulator and the fixed bearing of the continuous beam, corresponding to the maximum additional forces of rail reaching minimum values. Their appropriate matching locations are recommended based on the obtained influence laws of any locations of the rail expansion regulator and the fixed bearing of the continuous beam on the maximum additional forces of rail. The results can provide the theoretical basis for the design of the rail expansion regulator and the fixed bearing of long-span continuous bridges.

scholarly journals Response analysis of long-period seismic action in far field to long-span continuous beam bridge with isolated high piers

2021 ◽  
Vol 276 ◽  
pp. 02030
Author(s):  
Wang Yanan ◽  
Tang Guangwu ◽  
Liu Haiming ◽  
Wang Fujie ◽  
Chen yuan
Keyword(s):  
Ground Motion ◽  
Far Field ◽  
Continuous Beam ◽  
Long Period ◽  
Long Span ◽  
Continuous Beam Bridge ◽  
Seismic Records ◽  
High Pier ◽  
Long Period Ground Motion ◽  
Beam Bridge

In order to study the influence of far-field long-period seismic waves on high-pier and long-span continuous beam bridge, taking a high-pier and long-span continuous beam bridge with span arrangement of (95+170+95) m as an example, a numerical analysis model is established based on finite element software. According to the established wave selection criterion, 10 far-field long-period seismic records and 10 ordinary seismic records are selected from the strong earthquake record database. Using nonlinear time history analysis method, the difference of seismic response of long-span continuous beam bridge with isolated high piers under the action of ordinary ground motion and far-field long-period ground motion is studied. The results show that compared with the ordinary ground motion, the seismic response of long-span continuous beam bridge with isolated high piers is obviously increased under the action of long-period ground motion in the far field. When building isolated long-span bridges in areas with great influence of long-period ground motion in the far field, attention should be paid to the adverse effects caused by the frequency spectrum characteristics of ground motion.

scholarly journals Incremental dynamic analysis of the long-span continuous beam bridge considering the fluctuating frictional force of rubber bearing

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Man Liao ◽  
Bin Wu ◽  
Xianzhi Zeng ◽  
Kailai Deng
Keyword(s):  
Dynamic Analysis ◽  
Seismic Response ◽  
Vertical Component ◽  
Incremental Dynamic Analysis ◽  
Continuous Beam ◽  
Restoring Force ◽  
Long Span ◽  
Rubber Bearing ◽  
Continuous Beam Bridge ◽  
Beam Bridge

AbstractIn the seismic design of long-span bridges, the classic bi-linear model was used to simulate the frictional restoring force of the rubber bearings. However, in actual earthquake, the rubber bearing suffered fluctuating axial pressure in earthquake, even separated from the beam when vertical component of the earthquake was too strong. Employing the bi-linear model for the bearing may incorrectly estimate the seismic response of the bearings, as well as the whole bridge. This paper developed a nonlinear frictional bearing model, which can consider the variation of the frictional restoring force in the bearings, even the separation with the beam in vertical directions. A typical continuous beam bridge was modeled in ABAQUS, and incremental dynamic analysis was conducted for the quantitative comparison of the seismic responses using different bearing models. The intensity measure was selected as the ratio of the peak ground acceleration (PGA) in the vertical direction to the PGA in the horizontal direction. The analysis results indicated that the different bearing model led to the significant different seismic response for the bearings and piers, even the vertical component was small. The bi-linear bearing model would underestimate the seismic demand of the bearing and piers.

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

2011 ◽  
Vol 90-93 ◽  
pp. 969-974
Author(s):  
Jie Jun Wang ◽  
Ke Ke Yang ◽  
Can Bin Yin
Keyword(s):  
Temperature Field ◽  
Temperature Difference ◽  
Least Square Method ◽  
Least Square ◽  
Box Girder ◽  
Linear Temperature ◽  
Long Span ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
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

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