# STEPS IN ANALYSING A BRIDGE

STEPS IN ANALYSING A BRIDGE The analytical process for structure of bridges can be broken down to six main steps: Idealise the structure Form a model Idealise the loading in a form suitable for the model Solve the resulting equation Interpret the idealized results Check these results so that they comply with initial assumptions and(…)

# METHODS OF BRIDGE CONSTRUCTION

METHODS OF BRIDGE CONSTRUCTION: Before a bridge can be built an appropriate method of construction must be chosen. The decision is made by the design team. The principle factors considered by the design team when chosing a suitable method of construction are given below: The scale of the bridge The obstacles to be crossed The(…)

# ADVANTAGE OF CONTINUOUS OVER SIMPLY SUPPORTED MULTI-SPAN DECK

Advantages of continuous multiple-span deck over simply supported multiple-span deck Movement joints are normally added to bridge structures to accommodate movements due to dimensional changes arising from temperature variation, shrinkage, creep and effect  of prestress. However, the provision of excessive movement joints should be avoided in design because movement joints always encounter problems giving rise(…)

# INSPECTION OF A BRIDGE STRUCTURE

INSPECTION OF A BRIDGE STRUCTURE: Once a bridge is opened for use, management begins and carries on for the life of the bridge. Hence, the bridge must be regularly inspected and maintained for the benefit of its users. There are three levels of inspection: 1. General inspection: Usual inspection of representative parts of a structure.(…)

# CAST-IN-SITU METHOD OF BRIDGE CONSTRUCTION

Cast-in-situ Method of Bridge Construction: Cast-in-situ method of construction of bridges is a flexible method in which the demands of more unusual geometrical shapes can be easily coped with. This method is commonly used for short span bridges for the cost effective construction of solid, voided or ribbed reinforced concrete slab bridges. Each bridge type(…)

# BALANCED CANTILEVER METHOD OF BRIDGE CONSTRUCTION

Balanced Cantilever method of Bridge Construction: Balanced cantilever method of bridge construction is chosen where a bridge has few spans which range from 50 to 250m. Construction begins at each bridge pier. Special formwork is positioned and cast-in-situ pier segment is begun. The complete pier segment is then used as an erection platform and launching(…)

# PRECAST METHOD OF BRIDGE CONSTRUCTION

Precast Method of Bridge Construction: (i) Precast Beams: Precast beam decks are generally used for short span bridges ranging between 5m to 50m – these may be railway or motorway bridges. Standard inverted tee beams or M-beams are chosen and positioned by crane. Where precast beams are considered for a motorway bridge construction, the bridge(…)

# SPAN BY SPAN CASTING METHOD OF BRIDGE CONSTRUCTION

Span by Span Casting method of Bridge Construction: Span by span is a relatively new construction technique historically associated with cantilever construction but the advancement in external prestressing has enabled its own potential use to grow. Today it is considered to be the most economic and rapid method of construction available for long bridges and(…)