In the present study, the failure of cable stayed bridge across Chambal River (Kota) will be discussed. The causes of its collapse and detail study of the cable stayed bridge cross Chambal River will be done. The static and dynamic modeling of cable stayed bridge is also done. At the end, the measure to repair and rehabilitation cable stayed is discussed.
Cable stayed bridge has become one of the most frequently used bridge system throughout the world because of their aesthetic appeal, structural efficiency, enhanced stiffness compared with suspension bridge, ease of construction and small size of substructure. Over past 40 years, rapid developments have been made on modern cable stayed bridge. With main span length increasing , more shallow and slender stiffness girders used in modern cable stayed bridge, the safety of whole bridge under service loading and environmental dynamic loading such as impact , wind and earthquake loadings , presents increasingly important concern in design , construction and service
In India the first cable stayed bridge was AKKAR BRIDGE, SIKKIM (1985) Constructed by Gammon India limited. The other cable stayed bridge are Vidhya sagar Setu (1992) Kolkata, Bandra – worli sea link (Mumbai), Cable stayed bridge across Chambal river (Kota) etc.
Table of Contents
1. INTRODUCTION
1.1 General Remarks
1.1.1 History of cable stayed bridge
1.1.2 First cable stayed bridge
1.1.3 First cable stayed bridge in U.S.A.
1.1.4 Comparison with suspension bridge
1.1.5 Key advantages of cable stayed bridge
1.1.6 Types of cable stayed bridge
1.1.7 Parts of cable stayed bridge
1.1.7.1 Deck
1.1.7.2 Box girder
1.1.7.3 Prestressing concrete
1.1.7.4 Foundation
1.1.7.5 Pylon
1.1.7.6 Stay cables
1.1.8 Designing
1.1.9 Construction
1.1.10 Test on stay cables
1.1.11 Cable stayed bridge across Chambal river
1.1.12 General details of the project
1.2 LITRATURE RIVEW
1.2.1 General remarks
1.2.2 Review of work done in this field
1.2.3 Objective of the study
2. MODELING OF CABLE STAYED BRIDGE
2.1 General remark
2.2 Static modeling
2.2.1 Governing equation for deflected shape
2.2.2 Cables under its own weight
2.2.3 Cable subjected to UDL
3. CABLE STAYED BRIDGE ACROSS CHAMBAL RIVER: CASE STUDY
3.1 Silent features of the bridge
3.1.1 General arrangement
3.1.2 Deck section
3.1.3 Pylon
3.1.4 Piers
3.1.5 Foundation
3.2 Main span erection
3.3 Bearing
3.4 Mode of construction
3.5 Comparison with general mode of construction
3.6 Comparison with span-by –span mode of construction
3.7 Bearing support during failure
3.8 Detail of collapse
3.9 Causes of collapse
3.10 View of various agencies about mechanism of collapse
3.11 View of committee
4. REPAIR AND REHABILITAION
4.1 General Remarks
4.2 Design requirements
4.3 Factor of strength (limit state)
4.4 Cable condition rating
4.5 Rehabilitation strategy and cost rating
4.6 Replacement Cable Design
4.7 Super structure modification
4.8 Corrosion protection
4.9 Wind load consideration
4.10 Temporary cable design
4.11 Security and antivandalism
4.12 Major construction faults in Chambal bridge
Objectives and Topics
This dissertation examines the structural characteristics and construction failure of the cable-stayed bridge across the Chambal River in Kota, India. The work provides a comprehensive overview of cable-stayed bridge engineering, details a static and dynamic modeling analysis, and evaluates repair and rehabilitation strategies for structural integrity.
- Cable-stayed bridge design principles and structural components.
- Static and dynamic modeling techniques for bridge structures.
- Case study analysis of the Chambal River bridge collapse.
- Repair strategies, rehabilitation, and corrosion protection of stay cables.
- Evaluation of safety, redundancy, and quality control during bridge construction.
Excerpt from the Book
3.9Causes of collapse:
As per the construction methodology, a tower crane of about 110 m height was attached to the pylon P4 at three places. [6] The tower crane was attached to the pylon resting on bearings whereas there was no attachment of the tower crane with the pier itself. Such an arrangement could result in unaccounted forces being transferred from the tower crane to the pylon of the unfinished structure at P4.
There is no construction joint either vertical or horizontal. Thus, the actual construction was a clear departure from the drawings and method statement. The implication of this change should have been carefully examined and reflected in revised drawings and method statement. It was informed that vertical construction joints were introduced in the superstructure as continuous concreting was not possible because of the limited capacity of the batching plant available at site.
During inspection of later span P5-P6, cracks separation was observed at the horizontal construction joint in the web of the box girder. This indicates that the treatment of construction joint might not have been carried out to the required specification. Patchwork repair was also observed at several places indicating that there had been leakage of slurry at joints of formwork.
The several important operations to be carried out on pier cap P4 such as installation of longitudinal restraining devices, installation of 60 numbers of temporary mechanical jacks and temporary concrete blocks for prevention of rotation of the pier segment P4 of the superstructure. Although regular drawings are available for the construction of the longitudinal restraining device, it is surprising that arrangements for preventing rotation at pier P4 have been carried out without formal detailing and sequencing given by the designer and approved by the Proof Checker. A method statement for this activity proposed by the Contractor and duly approved by the Supervision Consultant is also not available.
Summary of Chapters
INTRODUCTION: Provides an overview of cable-stayed bridge types, components, and historical context, leading to the specific focus on the Chambal River bridge project.
MODELING OF CABLE STAYED BRIDGE: Details the theoretical framework for the static and dynamic analysis of cable-stayed structures, including load modeling and cable behavior.
CABLE STAYED BRIDGE ACROSS CHAMBAL RIVER: CASE STUDY: Analyzes the design features, construction methodology, and the root causes of the structural collapse of the Chambal River bridge.
REPAIR AND REHABILITAION: Discusses the maintenance, corrosion protection, and rehabilitation strategies essential for ensuring the service life and integrity of cable-stayed bridge systems.
Keywords
Cable-stayed bridge, Chambal River bridge, structural failure, bridge collapse, pylon, stay cables, construction methodology, static modeling, dynamic modeling, rehabilitation, structural integrity, corrosion protection, load-bearing structure, segmental construction, bridge design.
Frequently Asked Questions
What is the primary focus of this dissertation?
The dissertation focuses on the engineering analysis and the investigation of the construction failure of the cable-stayed bridge across the Chambal River in Kota, India.
What are the central themes discussed in this work?
The work covers structural modeling, design optimization for cable-stayed bridges, site investigation, failure mechanism analysis, and strategies for repair and rehabilitation.
What is the primary research objective?
The objective is to analyze the causes of the Chambal River bridge collapse through a detailed case study and provide a framework for static/dynamic modeling and structural rehabilitation.
What scientific methods were employed?
The study utilizes finite element modeling concepts, static analysis of catenary cable elements, and comparative forensic analysis of construction methodologies against design specifications.
What is covered in the main body of the work?
The main body includes a thorough description of the Chambal bridge components, the sequence of construction, an examination of the failure mechanisms, and various repair methodologies for stay cables.
Which keywords best describe this study?
Key terms include Cable-stayed bridge, structural failure, bridge collapse, pylon, stay cables, and bridge rehabilitation.
What role did the tower crane play in the collapse?
The study notes that the tower crane was attached to the pylon without proper connection to the pier, potentially transferring unaccounted forces to the unfinished structure.
How did the lack of redundancy contribute to the accident?
The lack of temporary stability devices and the removal of mechanical jacks before the bridge had reached sufficient self-stabilizing capacity created a lack of redundancy, rendering the structure vulnerable during its critical construction stage.
- Quote paper
- Rajshree Charan (Author), 2011, Repair and rehabilitation of a cable stayed bridge, Munich, GRIN Verlag, https://www.grin.com/document/462112
