PERFORMANCE OF LONG-SPAN BRIDGE STRUCTURES: THE EAST RIVER BRIDGES AT NEW YORK

1980 ◽  
Vol 352 (1) ◽  
pp. 133-141 ◽  
Author(s):  
Blair Birdsall
Keyword(s):  
New York ◽  
Long Span ◽  
East River ◽  
Long Span Bridge ◽  
Bridge Structures

Fire of steel and composite beam bridges

2019 ◽  
Author(s):  
Henryk Zobel ◽  
Wojciech Karwowski ◽  
Agnieszka Golubińska ◽  
Thakaa Al-Khafaji
Keyword(s):  
Fire Resistance ◽  
Composite Beam ◽  
Structural Integrity ◽  
Bridge Structure ◽  
Long Span ◽  
Long Span Bridge ◽  
Bridge Structures ◽  
Fire Scenarios ◽  
Design Construction ◽  
Cable Stayed Bridges

<p>The problem of bridge fires is growing. Because of a bad experience in Poland, it was decided to improve fire resistance of long span bridge structures, and of cable-stayed bridges in particular. Statistics shows that fire is a real threat to this kind of structure. They also confirm that the worst results of fire are for those with an orthotropic deck rather than with a concrete one. The basic problems to solve are how to predict fire resistance of a particular bridge and how to ensure safety and structural integrity of the bridge structure. Taking into account the fact that bridge standards do not include information relating to fire protection, and fire standards do not determine rules for design, construction and maintenance of such structures, there are no regulations for this problem. Fire scenarios are devoted to buildings, but the thermo-structural behavior of bridges is different.</p>

Random Seismic Response Analysis of Long-Span Bridge Structures

2012 ◽  
Vol 204-208 ◽  
pp. 2157-2161 ◽  
Author(s):  
Zhang Jun Liu ◽  
Yan Fu Xing ◽  
Yong Wan
Keyword(s):  
Seismic Response ◽  
Independent Random Variables ◽  
Response Analysis ◽  
Orthogonal Expansion ◽  
Bridge Structure ◽  
Seismic Response Analysis ◽  
Long Span ◽  
Long Span Bridge ◽  
Bridge Structures ◽  
Random Seismic Response

Based on the orthogonal expansion method of stochastic processes, seismic acceleration processes can be represented as a linear combination of deterministic functions modulated by a set of mutually independent random variables. In conjunction with the probability density evolution method, the random seismic response of bridge structures can be successfully researched. A long-span bridge structure is taken as an example. The probabilistic information of the response of a long-span bridge structure in different control under earthquake excitations is investigated. The investigation provides a new approach to the random seismic response analysis of long-span bridge structures.

Incorporation of Stress Time Dependence into Failure Projection Modeling of Corroding Bridge Post-Tensioning Tendons

CORROSION ◽  
10.5006/3607 ◽  
2020 ◽  
Vol 76 (11) ◽  
pp. 1088-1091
Author(s):  
William H. Hartt ◽  
Teddy S. Theryo
Keyword(s):  
Time Dependence ◽  
Analytical Modeling ◽  
Initial Value ◽  
Long Span ◽  
Long Span Bridge ◽  
Bridge Structures ◽  
Post Tensioning ◽  
Wire Strand ◽  
Creep And Shrinkage

Post-tensioning (PT) has evolved to become an important technology for designing long span bridge structures. However, tendon failures resulting from wire/strand corrosion have been reported as early as 2 y post construction. In response to this, a recent study introduced and evaluated an analytical modeling approach that projects corrosion-induced wire and strand fractures and tendon failures, given statistics that characterize wire corrosion rate. This past modeling effort assumed that tensile stress in tendons was constant with time at 63% of the guaranteed ultimate tensile strength (GUTS); however, in actuality this stress decreases with time over an assumed 10,000 d (approximately 27 y) from an initial value of about 70% of GUTS to a long-term value in the range 60% to 63% of ultimate at mid-span for a simply supported beam as a consequence of long-term concrete creep and shrinkage and strand relaxation. The present study builds upon this model by incorporating this time dependence of tendon stress into the failure projection modeling. Results are discussed within the context of better understanding bridge tendon integrity issues and corrosion related failure concerns.

Experimental Study on the Constitutive Relation of SPHSC under Uniaxial Compression Loading

2015 ◽  
Vol 782 ◽  
pp. 227-234
Author(s):  
Hao Zhou ◽  
Pei Yan Huang ◽  
Xin Yan Guo ◽  
Xiao Hong Zheng
Keyword(s):  
Composite Material ◽  
Uniaxial Compression ◽  
Steel Fiber ◽  
High Strength ◽  
Stress Strain ◽  
Theoretical Derivation ◽  
Long Span ◽  
Long Span Bridge ◽  
Bridge Structures ◽  
New Material

Steel fiber reinforced polymer high strength structural concrete (SPHSC) is a new composite material which is used in long-span bridge structures invented by this research team. Based on the new composite material, the experiments of stress-strain full curves under uniaxial compression were carried out. The stress-strain full curves were achieved from the simple improved method. By the method of theoretical derivation and experimental data fitting, the constitutive equation of SPHSC which contains only two undetermined parameters of compressive strength and parameter of steel fiber was obtained. The study is the theoretic basis of the new material which was widely use in civil engineering.

Application of Precast UHPC Web Members for Long-Span Bridge Structures

2017 ◽  
Vol 259 ◽  
pp. 140-145
Author(s):  
Vladimír Příbramský ◽  
Michaela Kopálová
Keyword(s):  
Cross Section ◽  
Theoretical Background ◽  
Modern Material ◽  
Long Span ◽  
Steel Members ◽  
Long Span Bridge ◽  
Bridge Model ◽  
Structural Applications ◽  
Bridge Structures ◽  
Alternative Approaches

UHPC is a modern material with great characteristics and shows all important properties for efficient structural design and construction process. Its applications lead to optimization of structures and to minimization of material consumption. The paper focuses on the application of slender precast UHPC slabs, which lighten monolithic bridges constructed by free cantilever method. The principle comes from constructed bridge: Takubogawa Bridge, Japan. The aim of this paper is to present basic theoretical background behind the structural applications of UHPC webs. Additionally, 3D bridge model of composite system with box cross section was created with application of UHPC precast webs and monolithic upper and lower slab. The behavior of the structure was analyzed and compared to conventional monolithic bridge model constructed by free cantilever method. The focus lies with detailed analysis of behavior of the UHPC webs. The paper also describes alternative approaches of lightening webs of box cross-section using steel members such as webs from corrugated steel sheet or steel truss.

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