Effects of connection flexibility in steel-concrete composite beams due to live loads

The paper describes the girders of bridges made of steel beams connected in a flexible way with a concrete deck slab. There are analyzed internal forces and displacements versus the changes in the connection degree that are due to variable cyclic loads occurring in bridges. The analysis of the problem is based on a classical parameter characterizing the connection flexibility C z and supplied with the coefficients μ and β defined by authors. They allow the connection degree of a combined girder to be estimated. There are analyzed two solutions to the problem of partial interaction in composite steel and concrete girder: a linear one based on the solution of analytical form (differential equations) and a non-linear one based on mechanics of clearances. The latter solution accurately shows the work of connectors in bridge spans. The analysis is illustrated by numerical examples of a real composite bridge. The attention is focused on the diagrams showing various shapes of curves representing the coefficients μ and β.

[1]  R. P. Johnson,et al.  Design of composite steel and concrete structures , 1993 .

[2]  Akinori Nakajima,et al.  Cyclic shear force–slip behavior of studs under alternating and pulsating load condition , 2003 .

[3]  Jian-Sheng Fan,et al.  STIFFNESS AND DEFLECTION OF STEEL-CONCRETE COMPOSITE BEAMS UNDER NEGATIVE BENDING , 2004 .

[5]  Neil M. Hawkins,et al.  Seismic Response of Composite Shear Connections , 1984 .

[6]  Paul Grundy,et al.  Incremental slip of stud shear connectors under repeated loading , 1997 .

[7]  Steel-Concrete Composite Beams under Repeated Load , 2002 .

[8]  Arkadiusz Madaj.  Doraźna nośność i sztywność na zginanie zespolonych belek stalowo-betonowych , 2005 .

[9]  Gaetano Manfredi,et al.  Analysis of Continuous Composite Beams Including Partial Interaction and Bond , 2000 .

[10]  Czesław Machelski,et al.  Influence of live loads on the soil-steel bridges , 2004 .

[11]  J. Y. Richard Yen,et al.  Composite Beams Subjected to Static and Fatigue Loads , 1997 .

[12]  Ezio Giuriani,et al.  LOW-CYCLE FATIGUE TEST ON STUD SHEAR CONNECTORS , 1997 .

[13]  R. G. Slutter,et al.  Fatigue Strength of Shear Connectors , 1966 .

[14]  D. Oehlers,et al.  The shear stiffness of stud shear connections in composite beams , 1986 .

[15]  Ezio Giuriani,et al.  Experimental study on stud shear connectors subjected to cyclic loading , 1996 .

[16]  L. An,et al.  Push-out tests on studs in high strength and normal strength concrete , 1996 .

[17]  Scott A. Civjan,et al.  Behavior of shear studs subjected to fully reversed cyclic loading , 2003 .

[18]  Francisco Virtuoso,et al.  Time dependent behaviour of continuous composite beams with flexible connection , 2004 .