Behaviour and evaluation of pin-connected steel truss bridges

1987 ◽  
Vol 14 (3) ◽  
pp. 327-335 ◽  
Author(s):  
Baidar Bakht ◽  
Leslie G. Jaeger
Keyword(s):  
Key Words ◽  
Experimental Procedure ◽  
Truss Bridges ◽  
Bridge Testing ◽  
Bridge Evaluation ◽  
Steel Truss ◽  
Steel Truss Bridges ◽  
Steel Trusses

Two posted bridges, with pin-connected steel trusses, were recently proof tested in Ontario. This paper presents some results of the tests and draws conclusions, which are also applicable to other similar structures. It is concluded that, unlike other bridge types, this type of bridge does not possess reserve strengths beyond those ascertained analytically. An experimental procedure is given in the paper using which the ratio of dead loads in the two components of a tension chord can be readily determined. This paper also describes a procedure by which equivalence between the test and design vehicles is established, thereby providing a basis for determination of the posting loads. Key words: bridge evaluation, bridge testing, pin-connected truss, posting load, proof test, through truss, steel truss, tension chord.

In-plane buckling of steel trusses

1978 ◽  
Vol 5 (4) ◽  
pp. 533-541 ◽  
Author(s):  
Paul F. Csagoly ◽  
Baidar Bakht
Keyword(s):  
Approximate Methods ◽  
Buckling Loads ◽  
Truss Bridges ◽  
Compression Members ◽  
Steel Truss ◽  
Full Capacity ◽  
Computer Based ◽  
The Individual ◽  
Steel Truss Bridges ◽  
Steel Trusses

The usual method for determining the in-plane buckling strength of steel trusses consists of determining the buckling loads for the individual compression members with an assumed degree of fixity at the ends of each member. The paper shows that a steel truss can buckle not only through the buckling of one of its compression members but also through the instability of one of its joints. It also shows that the end fixities of various members of a truss, which are functions of applied loads, cannot be determined in isolation, i.e., without considering the whole truss.A computer based iterative technique is presented for determining values of rotational restraints at the ends of truss members, and also for determining the buckling loads for individual compression members and joints of the truss. The method, which is implemented through a computer program, has been validated against model test results. It is expected that by using this method the reserve of strength in existing steel truss bridges, which results from designs based on approximate methods of analysis, could be realistically evaluated and utilized to allow the bridges to be used to their full capacity.

Structural Health Indices for Steel Truss Bridges

2011 ◽  
pp. 391-398 ◽  
Author(s):  
Ryan Kent Giles ◽  
Robin Kim ◽  
Billie F. Spencer ◽  
M. Nathan ◽  
Anne M. Newmark ◽  
...  
Keyword(s):  
Structural Health ◽  
Truss Bridges ◽  
Health Indices ◽  
Steel Truss ◽  
Steel Truss Bridges

Study on Dynamic Characteristic of 64m Railway Steel Truss Bridge on Expanding Heavy-Load Transport Condition

2011 ◽  
Vol 90-93 ◽  
pp. 1100-1105
Author(s):  
Zhi Jie Sun ◽  
Jun Min Shen ◽  
Jian Bin Zhao ◽  
Zhong Ming Su
Keyword(s):  
Dynamic Performance ◽  
Load Condition ◽  
Vertical Acceleration ◽  
Performance Parameters ◽  
Heavy Load ◽  
Double Line ◽  
Truss Bridges ◽  
Conventional Condition ◽  
Steel Truss ◽  
Steel Truss Bridges

Through theoretical calculation, systemic analysis of dynamic performance of the 64m single and double line railway steel truss bridges on the expanding condition and conventional condition. Contrast and analysis the main dynamic performance parameters of bridges on the two kinds of operating condition. In 64m steel truss bridges of Shuozhou-Huanghuagang Railway application practice proves that on expanding heavy-load condition, the main dynamic performance parameters of bridges are slightly larger than conventional condition, but the variation law of vertical acceleration of mid-span is different.

Study on Dynamic Characteristic of 64m Railway Steel Truss Bridge on the Different Speed of Train Loads

2012 ◽  
Vol 204-208 ◽  
pp. 2135-2138 ◽  
Author(s):  
Zhi Jie Sun
Keyword(s):  
Dynamic Performance ◽  
Load Condition ◽  
Vertical Acceleration ◽  
Double Line ◽  
Truss Bridges ◽  
Steel Truss Bridge ◽  
Systemic Analysis ◽  
Light Load ◽  
Steel Truss ◽  
Steel Truss Bridges

Through theoretical calculation, systemic analysis of dynamic performance of the 64m single and double line railway steel truss bridges on the different speed of train loads. Contrast and analysis the main dynamic performance parameters of bridges on the differend speed. In 64m steel truss bridges in Heavy-Haul Coal Line application practice proves that the deflection of the bridge to the speed is insensitive. The vertical acceleration and horizontal acceleration is sensitive to speed. The speed 80km/h is the speed which lead to the maximum vertical acceleration of the single line and double line in light-load condition.

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