000218811 001__ 218811
000218811 005__ 20180317094251.0
000218811 020__ $$a978-1-329150-30-0
000218811 037__ $$aCONF
000218811 245__ $$aPure geometrical consideration for bridge design in the early 20th century
000218811 269__ $$a2015
000218811 260__ $$aChicago$$bConstruction History Society of America$$c2015
000218811 336__ $$aConference Papers
000218811 520__ $$aBy reviewing some of the reinforced-concrete structures built in the early 20th century, this paper questions the geometrical aspects surrounding their design. It is well established that in the case of Robert Maillart’s designs, he relied on the logic of thrust lines, as was the case for masonry bridges that were provided by funicular polygons and graphic statics. Maillart also relied on trial sketches to define the mechanical features of successive sections of the bridge and on geometrical considerations to define the line of his bridges. In the case of his stiffened arch bridges, geometrical considerations were confined to following with almost regular thickness the trajectory of the thrust line. However, for some of them and for the whole family of three-hinged arch bridges, formal and geometrical considerations applied, for which some rules are presented here, and their evolution can be seen over time. The challenge in the geometrical organization of concrete around the thrust line is to equilibrate the stresses and manage the group of possible thrust lines depending on various loading cases. A well-designed concrete geometry avoids tensile stresses, which guarantees relatively long-lasting structures. With Maillart’s approach, an almost completely geometrical approach to design is encountered, since forces are also managed by geometry within the scope of graphic statics. Regular geometries and isostatic and symmetrical structures guarantee the possibility of undertaking a complete analysis using graphical approaches. However, when hyperstaticity or lateral forces are taken into account, the analysis is not as straightforward. This paper examines the extent to which the geometrical approach provides answers to these issues, with various hypotheses such as elastic analysis or a plastic lower-bound approach. The paper concludes by questioning this approach to the design of concrete structures in the early 20th century and its relative interest for structural design today.
000218811 6531_ $$adevelopment of structural forms (morphogenesis)
000218811 6531_ $$ageometry
000218811 6531_ $$adesign methods
000218811 6531_ $$astructural morphology
000218811 6531_ $$aconcretegraphic statics
000218811 6531_ $$aRobert Maillart
000218811 700__ $$aZastavni, Denis
000218811 700__ $$0250066$$aFivet, Corentin$$g265224
000218811 7112_ $$a5th International Congress on Construction History$$cChicago, Illinois, USA$$dJune 3-7, 2015
000218811 720_1 $$aBowen, Brian$$eed.
000218811 720_1 $$aFriedman, Donald$$eed.
000218811 720_1 $$aLeslie, Thomas$$eed.
000218811 720_1 $$aOchsendorf, John$$eed.
000218811 773__ $$j3$$q637-644$$tProceedings of the 5th International Congress on Construction History
000218811 909CO $$ooai:infoscience.tind.io:218811$$pENAC$$pconf
000218811 909C0 $$0252578$$pSXL$$xU13216
000218811 917Z8 $$x265224
000218811 937__ $$aEPFL-CONF-218811
000218811 973__ $$aOTHER$$rREVIEWED$$sPUBLISHED
000218811 980__ $$aCONF