By Jiri Strasky
'Stress-ribbon bridges' is the time period used to explain buildings shaped by way of a really slim concrete deck within the form of a catenary. they are often designed with a number of spans and are characterised by way of successive and complementary delicate curves. those curves mix into the normal setting and their varieties, the most straightforward and easy of structural recommendations, sincerely articulate the move of inner forces that are erected with no undue strain at the atmosphere. "Stress Ribbon and Cable-supported Pedestrian Bridges" seems at how narrow concrete decks are utilized in the layout of suspension and cable stayed buildings. It appears to be like at their attribute function; their stress, that is generally given through the strain stiffness of prestressed concrete decking, rather a lot in order that circulation attributable to pedestrians or wind doesn't sign in as pain via clients. beginning with a quick historical past the name describes structural forms, addresses normal layout standards, present expertise, static and dynamic research and discusses the result of the static and dynamic loading checks. Illustrated all through, "Stress Ribbon and Cable-Supported Pedestrian Bridges" presents examples of exceptional buildings, which were lately accomplished. This booklet should be of price to practising engineers who desire to comprehend the premises upon which the foundations are established and researchers who desire to increase the topic extra and scholars who desire to delve into the historical past in the back of the present loading ideas.
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Extra resources for Stress Ribbon and Cable-supported Pedestrian Bridges
9 Typical natural modes (a) (b) (c) 35 Copyright © ICE Publishing, all rights reserved. 2 Pedestrian bridges: results of analysis Bridge, structural type and date of completion/design Cross-section, reference depth and dead load 1. 0 kN/m 2. 087 3. 8 kN/m 4. 863 (C) Stress ribbon suspended on arch 2007 36 Copyright © ICE Publishing, all rights reserved. 6 kN/m 7. 8 kN/m 6. 3 kN/m 5. 2 Continued Bridge, structural type and date of completion/design Natural frequency (Hz) and mode shape Checking 8.
2 EI2 n2 l4 L: m Mp,a Mp,b Hq Mp,a Mp,b Beam (MNm) Beam (MNm) Stress ribbon (MN) Stress ribbon (MNm) Stress ribbon (MNm) 52 Copyright © ICE Publishing, all rights reserved. 57) describes the bending stiffness of the cable which, in engineering calculations, is insigniﬁcant. Natural modes of vibrations are deﬁned as: l i x ÿ n X 2 Ai cosð2fi Þt þ Bi sinð2fi Þt sin wðx; tÞ ¼ l i¼1 Cable analysis where Ai, Bi are determined by the progression of the right-hand side of equations: wðx; 0Þ ¼ gðxÞ Strasky J and Pirner M (1986) DS-L Stress ribbon footbridges.
L 2 Q ðxÞ dx 0 2H l cos2 þ D ¼ EA cos cos 2H 2 cos 2H l : sÿ ¼ EA cos 2 cos ! ð4:24Þ 45 Copyright © ICE Publishing, all rights reserved. 2(b)) is ! 4(b)) is deﬁned: Lni ¼ si ÿ Ási ð4:26Þ 0 where the temperature change Áti ¼ ti ÿ t0 and i is a coefﬁcient of thermal expansion. 3 Influence of deformation of supports and elongation of the cable at the anchor blocks In actual structures it is necessary to include possible deformations of supports and elongations of the cable at the anchor blocks.
Stress Ribbon and Cable-supported Pedestrian Bridges by Jiri Strasky