Study of Bridge Foundation Performance Under Dynamic Loading

1974 ◽  
Vol 11 (3) ◽  
pp. 409-419
Author(s):  
Robert B. Dodds ◽  
G. V. Ganapathy
Keyword(s):  
Bridge Piers ◽  
Bridge Structure ◽  
Railway Bridge ◽  
River Bed ◽  
Bridge Responses ◽  
Remedial Work ◽  
Bridge Foundation ◽  
Drill Holes ◽  
Work Done ◽  
Train Loading

Seismographic equipment was used to study the response of a railway bridge under dynamic train loading and thereby to determine the performance of the foundations of the bridge. The same methods were used to determine the effectiveness of remedial work done on the bridge piers and on the subsoil beneath the piers.The bridge was constructed in 1898 and is a three-span, masonry and stone arch bridge, 273 ft (83.2 m) in length. The east abutment is founded on bedrock, however, the west abutment and two piers in the river bed are founded on deep alluvial deposits.Seismographic studies indicated relatively large movements of one pier which were attributed to foundation scouring. A program of grouting the pier subgrade confirmed this assessment. Subsequent seismographic studies confirmed the effectiveness of the remedial works undertaken. The studies of the bridge responses under dynamic train loading provided sufficient data that scour areas beneath a pier could be pinpointed.The technique applied on this project determined bridge pier foundation conditions much more quickly and economically than a normal program of exploratory drill holes. The same technique could be used to assess the behavior of individual components of a bridge structure.

Using Finite Element Method and Support Vector Machine to Evaluate Scour Bridge Condition

2013 ◽  
Vol 330 ◽  
pp. 900-904 ◽  
Author(s):  
Chung Wei Feng ◽  
Hsun Yi Huang
Keyword(s):  
Support Vector Machine ◽  
Finite Element ◽  
Bridge Piers ◽  
Support Vector ◽  
Generic Model ◽  
Bridge Structure ◽  
Safety Level ◽  
Element Simulation ◽  
Proposed Model ◽  
Bridge Failure

Scouring around bridge piers is one of the major reasons for bridge failures and makes disaster since it tends to occur suddenly and without prior warning. However, the mechanism of water flow around the pier structure is complicated, which makes it is very difficult to develop a generic model to evaluate the scour bridge condition and provide a safety level. In this study, an integrated model that combines support vector machine (SVM) and finite element simulation technology is introduced to estimate the scour depth and determinate the safety level of scour bridge by using the natural frequency of the bridge structure. The proposed model in this study provides effective way to have a prior understanding of scour bridge condition and avoid the disaster of bridge failure.

UAV Based Multi-Hazard Vulnerability Assessment System for Bridges Exposed to Scour

2020 ◽  
Author(s):  
Okan Özcan ◽  
Orkan Özcan
Keyword(s):  
Load Capacity ◽  
Time History ◽  
Element Model ◽  
Lateral Load ◽  
Assessment System ◽  
Bridge Piers ◽  
Scour Depth ◽  
River Bed ◽  
Principal Axes

<p>Evaluating the multi-hazard performance of river crossing bridges under probable earthquake, flood, and scouring scenarios is a cumbersome task in performance-based engineering. The loss of lateral load capacity at bridge foundations may induce bridges to become highly vulnerable to failure when the effects of scour and floods are combined. Besides, the assessment of local scouring mechanism around bridge piers provides information for decision‐making regarding the pile footing design and for predicting the safety of bridges under critical scoured conditions. Thereby, accurate high-resolution Digital Elevation Models (DEMs) are critical for many hydraulic applications such as erosion, hydraulic modelling, sediment transport, and morphodynamics. In the present study, an automated unmanned aerial vehicle (UAV) based multi-hazard performance assessment system was developed to respond to rapid performance evaluation and performance prediction needs for river crossing reinforced concrete (RC) bridges. The Bogacay Bridge constructed over Bogacay in Antalya, Turkey was selected as the case study. In the developed system, firstly the seasonally acquired UAV measurements were used to obtain the DEMs of the river bed from 2016 to 2019. The transverse cross sections of the river bed that were taken close to the inspected bridge were used to measure the depth of the scoured regions along the bridge piles under the present conditions. Separately, in conjunction with the flood simulation and validation with 2003 flood event (corresponds to Q<sub>50</sub>=1940 m<sup>3</sup>/s), the scour depth after maximum probable flood load according to the return period of 500 years (Q<sub>500</sub>=2560 m<sup>3</sup>/s) were predicted by HEC-RAS software. Afterwards, the 3D finite element model (FEM) of the bridge was constituted automatically with the developed code considering the scoured piles. The flood loads were exerted on the modeled bridge with regard to the HEC-RAS flood inundation map and relevant water depth estimations around the bridge piers. For the seismic evaluation, nonlinear time history analyses (THA) were conducted by using scaled eleven scaled earthquake acceleration records that were acting in both principal axes of the bridge simultaneously by considering maximum direction spectra (SaRotD100) as compatible with the region seismicity. In the analyses; as the scour depth increased, the fundamental periods, shear forces and the bending moments were observed to increase while the pile lateral load capacities diminished. Therefore, the applicability of the proposed system was verified using the case study bridge.</p>

Deformation Monitoring of Railway Bridge Group Influenced by Construction of Metro Tunnel

2013 ◽  
Vol 405-408 ◽  
pp. 1810-1814
Author(s):  
Liang Hong Shi ◽  
Chuan Bao Feng ◽  
Tong Gang Zhang ◽  
Shang Dian Sha ◽  
You Wei Su ◽  
...  
Keyword(s):  
High Speed ◽  
Horizontal Displacement ◽  
Deformation Monitoring ◽  
Bridge Piers ◽  
Railway Bridge ◽  
Time Deformation ◽  
Bridge Group ◽  
Nanjing City ◽  
Metro Tunnel ◽  
The Stability

With the development of the high-speed railway (HSR) and metro, the metro crossing the HSR in operation usually happened in metropolis. Considering the stability of railway bridge foundation is very critical to the safety of HSR in operation, it is very important to monitor the influence of the construction of metro tunnel. The no.6 metro line of Nanjing city is crossing the railway bridge group, including three HSR lines, Beijing-Shanghai HSR, Nanjing-Anqing intercity railway, and Shanghai-Wuhan-Chengdu railway. A real-time deformation system using sensors with high accuracy and wireless network is designed to monitor the bridge piers, which are adjacent to the metro tunnel and may be affected in the bridge group. The tilt and settlement of bridge piers and horizontal displacement of pier head are considered in this system. The monitoring results show the feasibility of the system and grantee the operation and bridge engineerings safety.

scholarly journals Evaluasi Perencanaan Jembatan Kereta Api Rangka Baja Double Track Tipe Welded Through Truss Bentang 50 meter

2021 ◽  
Vol 6 (3) ◽  
pp. 132
Author(s):  
Badriana Nuranita ◽  
Erma Desmaliana ◽  
Kenny Gesa
Keyword(s):  
Stress Ratio ◽  
Steel Frame ◽  
Bridge Structure ◽  
Railway Bridge ◽  
Cross Sectional ◽  
Technical Requirements ◽  
Result Show ◽  
Cross Sectional Profile ◽  
Sectional Profile ◽  
Double Track

ABSTRAKPenelitian ini menganalisis perencanaan struktur atas jembatan kereta api rangka baja double track tipe Welded Through Truss (WTT) dengan bentang jembatan 50 m melalui Gambar Standar Tipikal Jembatan yang ada di lapangan. Analisis dan pembebanan jembatan sesuai kriteria teknis yang mengacu pada Lampiran Peraturan Menteri Perhubungan No. 60 Tahun 2012 tentang Persyaratan Teknis Jalur Kereta Api. Hasilnya dievaluasi dalam nilai tegangan dan defleksi. Hasil analisis menunjukan bahwa terdapat beberapa batang diagonal yang menghasilkan angka rasio tegangan > 1, sehingga perlu dilakukan penambahan tebal profil penampang atau juga menambahkan stiffener pada elemen-elemen jembatan yang kritis. Namun demikian nilai lendutan aktual di tengah bentang sebesar 46,651 mm masih memenuhi syarat karena kurang dari lendutan ijin 50 mm.Kata kunci: jembatan kereta api, welded through truss, PM 60 Tahun 2012, rasio tegangan dan defleksi ABSTRACTThis study analyzed the performance design about the uper structure of typical railway bridge for the 50 m WTT (Welded Through Truss) steel frame railway bridge with double track. Planning criteria refer to Attachment to the Minister of Transportation Regulation No. 60 of 2012 for Technical Requirements for Railroad. The results are evaluated in terms of stress ratio and deflection. The analysis result show that the 50 m WTT (Welded Through Truss) steel frame railway bridge has several diagonal bars that produce a stress ratio > 1, so it is necessary to add the thickness of the cross sectional profile or also to add a stiffener to the bridge structure. However the actual deflection value in the middle of the span of 46.651 mm still meets the requirements because it is less than the allowable deflection of 50 mm.Keywords: railway bridge, welded through truss, PM 60 of 2012, stress ratio and deflection

scholarly journals Effect of spatial variability of ground motion on non-linear dynamic behavior of cable stayed bridges

2018 ◽  
Vol 149 ◽  
pp. 02044
Author(s):  
Mouloud Ouanani ◽  
Boualem Tiliouine ◽  
Malek Hammoutene
Keyword(s):  
Spatial Variability ◽  
Dynamic Behavior ◽  
Ground Motion ◽  
Temporal Variations ◽  
Bridge Piers ◽  
Linear Dynamic ◽  
Cable Stayed Bridge ◽  
Non Linear ◽  
Bridge Responses ◽  
Cable Stayed Bridges

This present paper summarizes the main results of incoherence of Spatial Variability of Ground Motion (SVGM) component on the non-linear dynamic behavior of a Mila cable stayed bridge. The Hindy and Novack coherence model is developed for the present study in order to examine the SVGM on bridge responses, Nonlinear bridge responses are investigated in terms of transverse displacements and bending moments along the superstructure and substructure of the study bridge, as well as temporal variations of rotational ductility demands at the bridge piers ends under the incoherence SVGM component. The results are systematically compared with those obtained assuming uniform ground motion. As a general trend, it may be concluded that incoherence component of SVGM should be considered for the earthquake response assessments of cable-stayed bridges.

scholarly journals Local Scour of Bridge Pier Sited on a Multi-Layered Sedimentary Bed in Rivers

2020 ◽  
Vol 144 ◽  
pp. 01008
Author(s):  
Shaolin Yue ◽  
Huan Zhou ◽  
Wenlong Zhu ◽  
Minxi Zhang
Keyword(s):  
Local Scour ◽  
Bridge Pier ◽  
Maximum Depth ◽  
Bridge Piers ◽  
Scour Depth ◽  
Bridge Safety ◽  
Particle Sorting ◽  
River Bed ◽  
Weihe River ◽  
Sediment Particles

The riverbeds or sea beds are usually composed of multi-layers of sediments. The scour around bridge piers sited on such beds is vital to the bridge safety, but is still very difficult to be predicated as its complicated interaction between the flow and bed layers. A simple model is proposed in this study for calculating the local scour maximum depth around bridge piers sited on multi-layer of sedimentary bed, which is based on HEC-18 formula revised by Richardson and Davis (2001) and the formula of the repose angle of sediment particles proposed by Cheng (1993). This model considers the particle sorting when the scour proceeds. An application of the model into the local scour depth of Guopan bridge pier sited on the Weihe River bed in Baoji city of China preliminarily demonstrates its reliability to calculate the local scour maximum depth around bridge piers sited on multi-layer of sedimentary bed.

Field observations of river bed scour on the Peace River near Fort Vermilion, Alberta

1984 ◽  
Vol 11 (4) ◽  
pp. 782-797 ◽  
Author(s):  
R. Alex Harrington ◽  
D. G. McLean
Keyword(s):  
Field Measurements ◽  
Local Scour ◽  
Bridge Structure ◽  
Pier Scour ◽  
Box Girder ◽  
Peace River ◽  
River Bed ◽  
Predicted Values ◽  
Girder Bridge ◽  
Bed Scour

The results of field measurements of general and local scour on the Peace River at Fort Vermilion, Alberta are presented. The Peace River, the largest sand bed river in Alberta, has been regulated by the W. A. C. Bennett Dam since 1968, resulting in a general reduction in spring and summer discharges. Between 1971 and 1974 a 532 m twin box girder bridge structure, supported on steel H piles, was constructed at Fort Vermilion. A number of channel surveys have been carried out at the site at various discharges, providing considerable data with which to evaluate scour formulae used in practice. Comparison of measured results with predicted values of general scour indicates that most equations provide results in general agreement with the observed data, even though some of the regime equations may not be appropriate to sites with significant contractions. Computed local pier scour was generally greater than that measured at the site, although this is partly because of the nature of the pier footing configuration, which tended to arrest local scour. Key words: hydraulics, regime, rivers, sediment, scour.

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