Abstract
The article deals with two spans steel split-type one band pedestrian suspension bridge structure. Structural behaviour of such suspension member subjected to asymmetrical load has been discussed under the condition of temporary load influence imposed on one span out of two. Two structural solutions of one band suspension bridges have been considered: with completely flexible retaining elements, and in case of bending rigid. The article provides analytical expressions for calculations of the displacements of these asymmetrically loaded suspended elements, thrust forces and bending moments. Simplified analytical method accuracy of one band bridges is illustrated on the basis of performed numerical experiment Performed numerical experiment shows the resulting basis of simplified analytical method accuracy of one band bridges.
Highlights
Suspension bridges, due to their technical performance and excellent architectural appearance are widely used both for large and small spans to overlap (Gimsing 1997; Ryall et al 2000; Troyano 2003)
According to the operational requirements sag values of such bridge suspension carrying elements are relatively mean (Schlaich et al 2005). It induces high tensile forces formed inside load-carrying structures, requiring great steel rates and conditions the anchored foundation mass of such bridges (Katchurin 1969; Kulbach 2007)
One of the most serious drawbacks of the suspension bridges is their excessive deformations caused by the impact of asymmetric loads (Juozapaitis, Norkus 2004; Katchurin 1969; Kulbach 1999; Moskalev 1981; Wollmann 2001)
Summary
Suspension bridges, due to their technical performance and excellent architectural appearance are widely used both for large and small spans to overlap (Gimsing 1997; Ryall et al 2000; Troyano 2003). The article describes pedestrian two-span suspension split-type steel stress-ribbon bridges with a bending stiffness, analyzes the behaviour of such structures under the asymmetric load It deals with kinematic displacements of bearing suspension cable of such bridges, and provides them in the form of displacement calculation analytic expressions. Simplified engineering method (estimated) has been developed for the analysis of kinematic displacements of suspension split-type steel stress-ribbon bridge (Tarvydaitė, Juozapaitis 2010) It is assumed, that axial stiffness of the cable is equal to and the kinematic displacements caused by asymmetric load will be considered to the assumption. In order to obtain simplified engineering (estimated) expressions of suspension bridge displacements applying Eq (9) and taking into account Eq (10), the simplified formula to be applied for the calculation of the general displacement of the left cable will be as follows: This formula allows, at a known horizontal displacement of a standing pier to reduce the volume of the iterative calculation. That in this case the horizontal displacement of the standing pier is calculated according to the Eq (16)
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