scholarly journals Modified Multi-Support Response Spectrum Analysis of Structures with Multiple Supports under Incoherent Ground Excitation

2019 ◽  
Vol 9 (9) ◽  
pp. 1744 ◽  
Author(s):  
Shen ◽  
Li ◽  
Shi ◽  
Zhou
Keyword(s):  
Power Spectrum ◽  
Degrees Of Freedom ◽  
Response Spectrum ◽  
Structural Response ◽  
Structural Power ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Bridge Model ◽  
Displacement Vectors ◽  
Rigid Frame Bridge

This study develops a modified multi-support response spectrum (MSRS) method, in order to efficiently and accurately calculate the response of multi-support structures under incoherent ground motions. The modified MSRS method adopts three ancillary processes, constructing structural displacement vectors or constructing infinite stiffness members or increasing the degrees of freedom at structural supports. Then, the modified MSRS method is verified in a comparison with the existing MSRS method through a model of a five-span reinforced concrete continuous rigid frame bridge. Finally, the collective structural response spectrum, the structural power spectrum, and the simplified structural power spectrum are deduced from the equation of the motion taking ground motion displacements as the input, and validated through the same bridge model.

Study on the Influence of Beam Rigidity on Continuous Rigid Frame Bridge with Moving Vehicle

2012 ◽  
Vol 446-449 ◽  
pp. 1067-1070
Author(s):  
Rong Xia Wang ◽  
Xiang Shang Chen ◽  
Fan Li ◽  
Shao Wei Zhao
Keyword(s):  
Dynamic Load ◽  
Natural Vibration ◽  
Internal Force ◽  
Natural Vibration Frequency ◽  
Moving Vehicle ◽  
Continuous Rigid Frame Bridge ◽  
Vehicle Load ◽  
Rigid Frame ◽  
Bridge Model ◽  
Rigid Frame Bridge

The continuous rigid frame bridge has been applied widely in our country. But in recent years, over-deflection of beam in this bridge has become an serious problem. This may cause the redistribution of displacement and internal force of the whole structure, especially in dynamic load status. A two-dimensional pile-soil-bridge model is built up in ANSYS based on a factual bridge. The over-deflection is considered as the decrease of beam elastic modulus or rigidity. The displacement and internal force of key parts are analysed in static and dynamic vehicle load. The study shows that over-deflection will reduce the first three natural vibration frequency, weaken the sensitivity of bridge to dynamic load. In dynamic load status, the displacement and internal force will be influenced by beam rigidity.

Seismic Research of Continuous Rigid Frame Bridge under Cantilever Construction Method

2011 ◽  
Vol 368-373 ◽  
pp. 673-677 ◽  
Author(s):  
Xian Yuan Tang ◽  
Qiang Hu ◽  
Yong He Yu
Keyword(s):  
Response Spectrum ◽  
Time History ◽  
Highway Bridges ◽  
Element Model ◽  
Construction Method ◽  
Response Analysis ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Cantilever Construction ◽  
Rigid Frame Bridge

To research the effect of earthquakes of different magnitudes on continuous rigid frame bridge under cantilever construction method, combined with the newly promulgated seismic design rules of highway bridges in China, finite element model has been built by Midas software by using the response spectrum method and dynamic time history analysis method to analyze cantilever construction method of the various stages of seismic response analysis. The results indicate that the bending moments of root segments of cantilever beams and the bottom sections of piers change greatly. So it should be attached importance to in design.

Seismic Performance Analysis of Continuous Rigid Frame Bridge with High-Piers and Long-Span

2014 ◽  
Vol 1065-1069 ◽  
pp. 902-907
Author(s):  
Lou He ◽  
He Ping Hu ◽  
Chang Qing Guo
Keyword(s):  
Finite Element ◽  
Seismic Performance ◽  
Dynamic Characteristics ◽  
Response Spectrum ◽  
Response Spectrum Method ◽  
Spectrum Method ◽  
Long Span ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Rigid Frame Bridge

The dynamic characteristics of Tukan Wujiang Bridge are analyzed numerically. The bridge, which is still under construction, is a continuous rigid frame bridge with high-piers and long-span in Wulong County, Chongqing, China. A spatial finite element model is established for the bridge with the finite element software ABAQUS. The natural vibration characteristics and effective modal participation mass of the bridge in the built-up case is obtained. The variation of dynamic characteristics of continuous rigid frame bridge subjected to the dynamic earthquake loading is studied, and the number of modes necessary to the vibration mode combination when applying the response spectrum method under the earthquake is obtained. In addition, the seismic response of the bridge is analyzed with both the response spectrum method and the time-history method, and the maximum response of structure under various probability of earthquake is obtained. The results of the two methods are compared. The comprehensive seismic performance of the bridge is analyzed and evaluated. The results show that the seismic performance of the rigid frame bridge satisfies the expected design performance.

scholarly journals Seismic Performance Analysis of Continuous Rigid Frame Bridges in Expressway under Non-linear Interactions of Soil-Piles

2018 ◽  
Vol 175 ◽  
pp. 04037
Author(s):  
FENG Yongbing
Keyword(s):  
Response Spectrum ◽  
Time History ◽  
Time History Analysis ◽  
Structural Safety ◽  
Response Spectrum Method ◽  
Spectrum Method ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
History Analysis ◽  
Rigid Frame Bridge

Taking the three-span pre-stressed concrete continuous rigid frame bridge as an engineering example, MIDAS Civil was utilized to establish a spatial finite element model and the interaction between pile foundation and the soil was simulated by equivalent soil spring. In addition to analyzing shearing force, bending moment and stress of the primary beam's characteristic section under different loads, a response spectrum method and time history analysis were adopted to conduct seismic response analysis respectively. In this case, performance of the bridge could be comprehensively evaluated. Relevant analysis results indicate that internal force of the large-span pre-stressed concrete continuous rigid frame bridge is mainly induced by gravity and pre-stress of the structure; section stresses of the primary beam satisfy the corresponding specification and structural safety can be achieved in a state of operation. Moreover, computed results obtained by the response spectrum method is more conservative than those of the time history analysis. In terms of continuous rigid frame bridge, different seismic directions should be taken into consideration during structural seismic analysis at different construction stages.

scholarly journals Design and Construction Strategy of Arched Continuous Rigid-frame Bridge

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Yueqi Gao
Keyword(s):  
Road Traffic ◽  
Rapid Development ◽  
Social Background ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Bridge Model ◽  
Construction Strategy ◽  
Urbanization In China ◽  
Rigid Frame Bridge ◽  
Design And Construction

With the current rapid development of urbanization in China, people's living standards have been greatly improved. In the context of such a development background, the requirements for road traffic are getting more stringent, especially for bridge projects. The arched continuous rigid-frame bridge was developed under this social background. The advantage of the bridge lies in the design of a bridge model that integrates various functions such as transportation, landscape, and sightseeing. Based on the above, this paper first refers to the case to analyze the design and construction strategy of the arched continuous rigid-frame bridge, in hope of providing a valuable reference for relevant personnel.

Seismic Response on the Mangjiedu Long-Span PC Continuous Rigid Frame Bridge with High Piers

2013 ◽  
Vol 444-445 ◽  
pp. 1265-1271
Author(s):  
Jian Bin Xie ◽  
Deng Feng Hu ◽  
Miao Fu ◽  
Chang Chang Wu
Keyword(s):  
Seismic Response ◽  
Spectrum Analysis ◽  
Response Spectrum ◽  
Time History ◽  
Response Spectrum Analysis ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
History Analysis ◽  
Rigid Frame Bridge ◽  
Main Bridge

The selected high-span continuous rigid frame bridge for studying is Mangjiedu Bridge in this paper. Based on the principle of structure dynamics and the method of seismic response analysis, the finite element model of the main bridge in Mangjiedu Bridge under Midas-civil was built according to the structural features, site conditions and seismic fortification intensity of the bridge. Then the characteristics of main bridge structure were studied using Lanzcos modal analysis method, and the seismic responses of main bridge are studied by earthquake response spectrum analysis and time history analysis respectively. The results show that the fundamental frequency of the main bridge is 0.1943Hz, and the transverse vibration mode shapes are most remarkable in the former 10 ordered types of vibration of main bridge. The main bridge is in the conditions of elastic range and does not failure under E1 earthquake. Both response spectrum analysis and time history analysis show that the largest displacement along the main bridge appears at the top of pier and the largest transverse displacement appears in the central position of main span. It also shows that the maximum shear and maximum moment occur at the bottom of main pier.

Curing Parameters’ Influences of Early-age Temperature Field in Concrete Continuous Rigid Frame Bridge

2021 ◽  
pp. 127571
Author(s):  
Yong Zeng ◽  
Yutong Zeng ◽  
Dong Jiang ◽  
Shanhong Liu ◽  
Hongmei Tan ◽  
...  
Keyword(s):  
Temperature Field ◽  
Early Age ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Rigid Frame Bridge

Analysis of Technical Characteristics and Construction Focus of Long-Span Continuous Rigid Frame Bridge with High-Rise Piers

2014 ◽  
Vol 587-589 ◽  
pp. 1637-1641
Author(s):  
Yao Cui ◽  
We Nang Hou ◽  
Fei Ying Liu
Keyword(s):  
Deep Water ◽  
Water Reservoir ◽  
Bridge Pier ◽  
Reservoir Area ◽  
High Rise ◽  
Construction Methods ◽  
Long Span ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Rigid Frame Bridge

Under the condition of the deep water reservoir area, the choice of bridge pier and long span continuous rigid frame beam construction methods are quite various. And the analysis of destruction of bridge depends mostly on the beam and piers. The paper cares mostly about these two parts.

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