The Impact Effect Study Due to The Suspender Break in Through Arch Bridges

2011 ◽  
Vol 199-200 ◽  
pp. 1324-1330
Author(s):  
Rui Juan Jiang ◽  
Yi Yan Chen ◽  
Qi Ming Wu ◽  
Xiao Wei Yi
Keyword(s):  
Bridge Deck ◽  
Time History ◽  
Effect Study ◽  
Time History Analysis ◽  
The Other ◽  
Arch Bridge ◽  
Impact Effect ◽  
History Analysis ◽  
Arch Bridges ◽  
The Impact

It is well-known that in modern through arch bridges the suspenders are important components since they connect the bridge deck and the arch ribs. When the suspender break happens, the other components of the through arch bridge will be impacted successively. Sometimes, the collapse of bridge deck may be induced by the possible suspender break. In this paper, the impact effect on the remaining components of the through arch bridge due to the suspender break is studied and obtained by appropriate simulation and time-history analysis using the comprehensive commercial software ANSYS, which is based on a real through arch bridge. The study in this paper will be helpful to carry out the reasonable design of the through arch bridge.

Seismic Assessment of RC Arch Bridge: A Case of 2015 Gorkha Earthquake

2019 ◽  
Vol 15 (1) ◽  
pp. 47-53
Author(s):  
Prakash Gaire ◽  
Ma Hongwang
Keyword(s):  
Ground Motion ◽  
Time History ◽  
Time History Analysis ◽  
Nonlinear Time History Analysis ◽  
Gorkha Earthquake ◽  
Arch Bridge ◽  
History Analysis ◽  
2015 Gorkha Earthquake ◽  
Seismic Force ◽  
The Impact

Nepal Himalayas is one of the most seismic vulnerable zones. The active tectonic action impels the assessment of structures in possible seismic hazards including the bridge structures. This paper presents the impact of the 2015 Gorkha earthquake on the existing reinforced concrete arch bridge at Chobhar, Nepal. A three-dimensional model of the bridge is constructed using Open Sees platform. Nonlinear pushover analysis was performed to find the displacement capacity of the bridge. Ground motion from the main shock of the 2015 Gorkha earthquake is used in this study. Nonlinear time history analysis is performed with three orthogonal ground motions applied in the transverse, longitudinal and vertical direction of the bridge. The study investigates the safety of the bridge scaling up the ground motion to potential PGA in Nepal Himalayas; the result demonstrated the necessity of retrofit to ensure the safety level. Moreover, the horizontal seismic force obtained from the time history analysis is compared with the force obtained from the design code of the bridge. Also, the design force as per the present code (revised code) is presented.

Novel Hanger Design to Improve the Robustness of Through Arch Bridges

2011 ◽  
Vol 90-93 ◽  
pp. 862-868
Author(s):  
Qi Ming Wu ◽  
Dang Qi Yang ◽  
Fei Cui ◽  
Xiao Wei Yi ◽  
Rui Juan Jiang
Keyword(s):  
Progressive Collapse ◽  
Time History ◽  
Structural Members ◽  
New Approach ◽  
Arch Bridge ◽  
Structural Robustness ◽  
Arch Bridges ◽  
Dynamic Time ◽  
The Impact ◽  
Emergency Measures

Hangers in through arch bridges are important components since they suspend the bridge deck from the arch ribs. Local damage at a hanger may lead to progressive damage of various components in the arch bridge or even progressive collapse of the bridge. In this paper, the conventional design of double-hangers in through arch bridges is reviewed. Then a new approach to design the double-hangers is put forward. The suitability and robustness of this approach is then verified by a numerical simulation of a real through arch bridge. The impact effects induced by local hanger fracture on other structural members are simulated by dynamic time-history analyses. The new approach to design the hangers for through arch bridges is shown to improve the structural robustness. With the application of the new way put forward here, when one or more hangers are damaged to fail, the through arch bridge will not be endangered and will still maintain the overall load-bearing capacity during an appropriate length of time to allow necessary emergency measures to be taken, which illustrates the leading principle of structural robustness well.

scholarly journals Seismic Performance Evaluation of a Reinforced Concrete Arch Bridge

2017 ◽  
Vol 12 (1) ◽  
pp. 120-126
Author(s):  
Jeena Dangol ◽  
Rajan Suwal
Keyword(s):  
Reinforced Concrete ◽  
Ground Motion ◽  
Seismic Performance ◽  
Axial Force ◽  
Time History ◽  
Time History Analysis ◽  
Longitudinal Displacement ◽  
Arch Bridge ◽  
History Analysis ◽  
Force Variation

The entire Himalayan belt including Nepal area, because of its active tectonic movement, is seismically active causing high risk of earthquake in this region. It is important to evaluate the seismic performance of the structures including bridges to identify to what extent they would survive during earthquake. A reinforced concrete two hinged arch bridge located in Chobhar, Nepal has been selected for the research purpose. This paper presents the determination of seismic performance of a reinforced concrete arch bridge under different ground motions. The seismic input was taken as five different earthquake ground motion histories having different V/H peak ground acceleration ratio for time history analysis. Displacement capacity of the bridge was determined from pushover analysis. Time history analysis was conducted in two different steps: first only horizontal acceleration was applied and next vertical acceleration was applied in addition to horizontal ground motion. Comparisons were made between the responses of the bridge for these two cases. It was found that inclusion of vertical component of ground motion has negligible effect in variation of longitudinal displacement. However, there was remarkable effect in axial force variation. Significant effect in axial force variation in arch rib was observed as V/H ratio increased although the effect in longitudinal displacement with increase in V/H ratio was negligible. Moment demand also increased due to high axial force variation because of vertical ground motion.Journal of the Institute of Engineering, 2016, 12(1): 120-126

scholarly journals Analysis on the Influence of Increasing Seismic Fortification Intensity on Seismic Performance of Underground Station

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Ying Zeng ◽  
Shiguang Xu ◽  
Shiqian Yin
Keyword(s):  
Ground Motion ◽  
Seismic Performance ◽  
Time History ◽  
Time History Analysis ◽  
Structural Deformation ◽  
Equivalent Linearization ◽  
History Analysis ◽  
Underground Station ◽  
The Impact ◽  
Station Structure

China Earthquake Parameter Zoning (2016) has increased the seismic fortification intensity in Chengdu from VII to VIII. It is necessary to conduct in-depth discussion on the impact of the seismic performance of the built underground station structure. In this paper, a stratum-structure finite element model is established with a Chengdu subway station as an example. The model boundary adopts viscoelastic boundary, and the ground motion is input in the form of equivalent nodal force. The equivalent linearization method is used to consider the nonlinearity of soil materials. The time-history analysis of seismic fortification intensity of VII and VIII degrees is carried out, respectively. By comparing the calculation results of the two seismic fortification intensity ground motion conditions, it is concluded that the connection between the side wall and the floor is the weakest position of the station structure under the action of the earthquake; the seismic fortification intensity is increased from VII to VIII to the internal force of the structure. It has a relatively large impact, especially the most obvious impact on the bending moment. The results of the verification of the seismic time-history analysis show that the increase of fortification intensity will have a more obvious impact on the structural deformation, and the structural design of the station can meet the safety performance requirements of VII and VIII degrees of seismic fortification. The research has certain reference significance for the seismic safety evaluation of the built underground station structure in Chengdu area.

scholarly journals EVALUASI KINERJA STRUKTUR JEMBATAN PELENGKUNG AKIBAT BEBAN GEMPA DENGAN ANALISIS RIWAYAT WAKTU

2020 ◽  
Vol 6 (2) ◽  
pp. 151-156
Author(s):  
Widya Apriani ◽  
Reni Suryanita ◽  
Fadrizal Lubis
Keyword(s):  
Compressive Force ◽  
Time History ◽  
Time History Analysis ◽  
Bridge Structure ◽  
Analysis Method ◽  
Arch Bridge ◽  
Loma Prieta Earthquake ◽  
History Analysis ◽  
Bridge Structures ◽  
Second Period

The behavior of the arch bridge structure has its own peculiarities in distributing loading. The curved shape of the structure allows the structure's own weight to be transferred to the foundation as the normal compressive force without bending. the load is transferred through the semicircular structure to the abutments on either side. The curved (semicircular) design will naturally shift the load received by the floor of the bridge vehicle towards the abutment which keeps both sides of the bridge from moving sideways. Earthquake is a dominant horizontal cyclic loading of a structure. The performance of bridge structures due to the effects of earthquake loading is an important aspect that needs to be taken into account in designing and evaluating the bridge structure. The method used in this study is time history analysis. This article aims to evaluate the performance of arch bridge structures due to earthquake loads by using time-history analysis method. The results of the structure performance show that. The performance of the bridge due to the loading of the Loma prieta earthquake is generated from the period scale that has been analyzed with the 10 second period of the first earthquake for each result. Based on the results of Midas analysis, the strongest location where the damage occurs is in the middle of the bridge road. At the coordinates of 19 the largest displacement is at joint 268 of 1.177169 mm and for U2 of 0.0194 mm and U3 of 31.763771 mm.

scholarly journals Seismic Evaluation of Multi Storey Building with Ground Soft Story and with Infill Action

2021 ◽  
Vol 10 (6) ◽  
pp. 22-27
Author(s):  
mahaboob subhani* Shaik ◽  
Budda Beeraiah
Keyword(s):  
Spectrum Analysis ◽  
Linear Time ◽  
Response Spectrum ◽  
Time History ◽  
Time History Analysis ◽  
Ground Movement ◽  
Base Shear ◽  
Wall Area ◽  
History Analysis ◽  
The Impact

The improvements in (3D) three–dimensional underlying examination and processing assets have permitted the effective and safe plan of taller constructions. These constructions are the outcome of expanding metropolitan densification and financial suitability. The pattern towards continuously taller constructions has requested a move from the conventional strength based plan approach of structures to an emphasis on obliging the general movement of the design. Presently a day's supported cement (RC) divider outline structures are generally suggested for metropolitan development in zones with high SE danger. Presence of shear dividers bestows an enormous solidness to the sidelong power opposing arrangement of the RC building. Appropriate specifying of shear dividers can likewise prompt bendable conduct of such constructions during solid quake shaking. One of the remarkable boundaries impacting the shear divider (SD) SE (SE) conduct outline structures is the SD region proportion. In this manner a scientific examination is performed to assess the impact of Shear Wall Area to floor zone proportion (SW/FZP %) on the SE conduct of multistoried RC structures with delicate story at ground floor. For this reason, 12 structure plans that have Five, Eight and Twelve stories with SW/FZP % going somewhere in the range of 0.70% and 1.31% in the two ways are created. Here, the conduct of these plans under quake stacking is evaluated via doing Response Spectrum Analysis and Linear Time History Analysis utilizing primary examination programming E-TABS. Reaction Spectrum Analysis is finished by SE code IS 1893:2002. Straight Time History Analysis is completed by considering the three ground movement records to be specific Bhuj, Chamba and Uttarkasi. The primary boundaries considered in this investigation are the connection SW/FZP % has with base shear and rooftop dislodging, story uprooting and story float. The logical outcomes demonstrated that building plans with SW/FZP % equivalent to 1% acted sufficiently under tremor loads. Furthermore when the SW/FZP % expanded past 1% it is seen that the improvement of the SE presentation isn't as huge.

Effects of Pier Stiffness on the Seismic Response of Continuous Bridges with Irregular Configuration

2014 ◽  
Vol 638-640 ◽  
pp. 1794-1802 ◽  
Author(s):  
Si Si Wei
Keyword(s):  
Seismic Response ◽  
Linear Time ◽  
Time History ◽  
Time History Analysis ◽  
The Other ◽  
Relative Stiffness ◽  
History Analysis ◽  
Non Linear ◽  
Internal Forces

The seismic response of 4-span continuous bridges with different configurations has been investigated. In the series of bridges studied, the height of the central pier varies from 5 m to 100 m, while the heights of all the other piers remain the same. Using non-linear time history analysis, the internal forces at the bottom of individual piers have been predicted for each case. The correlation between the relative stiffness of adjacent piers and the ratio between the seismic response at the bottom of adjacent piers has been studied. Based on the results, in order to guarantee approximately balanced seismic response among all piers of a given bridge, a range of the relative column stiffness of two adjacent piers has been proposed.

Effects of Base Isolation and Infill Panels on the Nonlinear Time History Analysis of Reinforced Concrete Building

2021 ◽  
Vol 879 ◽  
pp. 213-220
Author(s):  
Halla Jasem Mohamad ◽  
Mohamad Najim Mahmood
Keyword(s):  
Reinforced Concrete ◽  
Strong Earthquake ◽  
Time History ◽  
Time History Analysis ◽  
Roof Displacement ◽  
Nonlinear Time History Analysis ◽  
Infill Panels ◽  
History Analysis ◽  
Nonlinear Time History ◽  
The Impact

This paper presents the predicted results of nonlinear time history analysis of 11 storey (G+10) Reinforced Concrete (RC) residential building under the effects of a strong earthquake. The paper includes studying the effects of using Lead Rubber Bearings (LRB) as base isolators to improve the performance of RC building to sustain the impact of an earthquake. It also includes the effects of the infill panels on the overall dynamic response of both fixed base and base-isolated buildings subjected to a strong earthquake. The main results that are presented in this study include the variation of roof acceleration, roof displacement, base shear with time. The effects of using LRB and including the infill panels on the storey drift are also presented. Maximum reduction in the story drift was obtained when infill panels are included in the analysis of the base isolated building. The inclusion of the infill panels has only marginal effects on the variation of roof displacement with time when the building is isolated by LRB. The main important improvements that emerged from using LRB as well as the infill panels in the analysis are the reduction of inelastic energy and upgrading the elastic one that is summed up along the period of the earthquake.

Comparison of Analysis Methods for Transient Forces

2012 ◽  
Author(s):  
Byung Jo Kim
Keyword(s):  
Analytical Methods ◽  
Time History ◽  
Time History Analysis ◽  
Assessment Process ◽  
System Response ◽  
History Analysis ◽  
Simplified Method ◽  
Fluid Transients ◽  
The Impact ◽  
Transient Forces

Fluid transients have been a major topic of research due to its possible fatal consequence. For example, the sudden closure of valves or operation of pumps can create pressure waves. High pressure pulses propagate through pipelines and generate huge unbalanced forces, known as waterhammer. A lack of consideration of fluid transient forces can even lead to pipe ruptures. The increasing interest in dynamic safety demands the necessity of deep considerations for fluid transients. An assessment process is required that includes the internal unbalanced forces and the dynamic system response in the pipework. This paper presents the comparison between a simplified method and time history analysis, which are analytical methods for transient forces. A simplified method is manual calculation based on the conservation of mass and momentum equations, and the impact loading theory. Time history analysis is computer simulation for transient analysis and piping structural analysis. The paper illustrates the deviations of result which contain waterhammer force, displacements and resultant stresses for the piping system by applying both analytical methods.

Sign in / Sign up

Export Citation Format

Share Document