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Curved footbridges supported by a shell obtained through thrust network analysis

Journal of Traffic and Transportation Engineering(English Edition) 2019年第1期6卷 65-75页

作者： luigi fenu Eleonora Congiu Davide Lavorato Bruno Briseghella Giuseppe Carlo Marano Department of Civil and Environmental Engineering and Architecture University of Cagliari Department of Architecture University of Roma Tre College of Civil Engineering Fuzhou University Department of Sciences of Civil Engineering and Architecture Polytechnic University of Bari

After Maillart's concrete curved arch bridges were built before the Second World War, in the second half of the past century and this century, many curved bridges have been built with both steel and concrete. Conversely, since the construction of Musmeci's shell supported bridge in Potenza, few shell bridges have been constructed. This paper explains how to design a curved footbridge supported by an anticlastic shell by shaping the shell via a thrust network analysis(TNA). By taking advantage of the peculiar properties of anticlastic membranes, the unconventional method of shaping a shell by a TNA is illustrated. The shell top edge that supports the deck has an assigned layout, which is provided by the road curved layout. The form of the bottom edge is obtained by the form-finding procedure as a thrust line, by applying the thrust network analysis(TNA) in a non-standard manner,shaping the shell by applying the boundary conditions and allowing relaxation. The influence of the boundary conditions on the bridge shape obtained as an envelope of thrust lines is investigated. A finite element analysis was performed. The results indicate that the obtained shell form is effective in transferring deck loads to foundations via compressive stresses and taking advantage of concrete mechanical properties.

关键词： Shell footbridges Cantilevered deck Anticlastic shell Thrust network analysis(TNA) Concrete

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维普期刊数据库

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Fully Stressed Piles and Beams in a Winkler's Medium,End-loaded by an Orthogonal Force,and with Optimum Length

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施工技术 2010年第3期39卷 110-115页

作者： luigi fenu Department of Structural Engineering University of Cagliari

A simplified method of designing fully stressed piles and beams with optimum length in a Winkler's medium,end-loaded by an orthogonal force and without any point constraint,is proposed. A numerical algorithm distributing the mass by means of the Fully Stressed Design ( FSD) method and updating the moment by finite elements has been first implemented. The use of the FSD method is in general quite simple,and allows to obtain optimum,or close to the optimum,solutions. After having distributed the mass through the FSD method,the length has been finally optimised by means of a heuristic procedure.

关键词：建筑施工施工技术质量管理地基

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维普期刊数据库

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The optimal shapes of piles in integral abutment bridges

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Journal of Traffic and Transportation Engineering(English Edition) 2017年第6期4卷 576-593页

作者： Cheng Lan Bruno Briseghella luigi fenu Junqing Xue Tobia Zordan Bolina Ingegneria Ltd Venezia 30174Italy College of Civil Engineering Fuzhou UniversityFuzhou 350108China Department of Civil Engineering Envronmental Engineering and AchitectureUniversity of CagliariCagliari 09124Italy

Integral abutment bridges （IABs） can be used to avoid the durability issues associated with bearings and expansion joints. For this type of bridge, the design of the optimal pile foundation, especially with respect to the horizontal stiffness, is a challenging issue. A structural optimization approach is proposed in this paper to optimize the pile foundation shape in integral abutment bridges. A procedure was implemented based on linking MATLAB, where an optimization code was developed, and OpenSees, which was used as the finite element solver. The optimization technique was compared with other techniques developed in previous researches to verify its reliability; the technique was then applied to a real 400 m-long IAB building in Verona, Italy, as a case study. The following two possi- bilities were considered and compared：（a） a pile with two different diameters along the depth and Co） a pile with a pre-hole. In fact, to increase the lateral and rotational flexibilities of the pile head, piles for an integral abutment bridge foundation are often driven into pre- deep holes filled with loose sand. Finally, the case of super-long integral abutment bridges （L = 500 m） with a corresponding displacement on one bridge end of approximately 50 mm was analysed. The following four pile design optimization eases were considered with similar study criteria as the Isola della Scala Bridge：（a） a pinned pile head for semi-integral abutment, Co） a fixed pile head without a pre-hole, （c） a fixed pile head with a pre-hole of any depth, （d） a fixed pile head of a pre-hole with a depth limit （〈 2 m） allowing for enoughembedded length for the friction pile. The case studies confirmed the potential of the proposed optimization techniques for finding the optimal shape of piles in integral abut- ment bridges.

关键词： Integral abutment bridgesStructural optimizationConcrete pilesFEM simulation

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维普期刊数据库

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一种新型张拉整体桥梁结构——张弦梁人行桥结构设计与分析

一种新型张拉整体桥梁结构——张弦梁人行桥结构设计与分析

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第二十届全国桥梁学术会议

作者：谢志涛谢成新黄文金 fenu luigi 福建农林大学交通学院意大利卡利亚里大学

张拉整体结构具有材料利用率高,构造简单,施工方便,较高的建筑美学价值等特点,近年来广泛应用于大跨穹顶结构中。为了促进张拉整体结构在桥梁工程中的应用,设计了一座简支单跨30m张弦梁结构人行桥,并对其结构性能进行了有限元分析。人... 详细信息

张拉整体结构具有材料利用率高,构造简单,施工方便,较高的建筑美学价值等特点,近年来广泛应用于大跨穹顶结构中。为了促进张拉整体结构在桥梁工程中的应用,设计了一座简支单跨30m张弦梁结构人行桥,并对其结构性能进行了有限元分析。人行桥上部结构由预应力钢绞线主缆、钢管撑杆、钢拉杆、矩形钢管混凝土纵梁（拱形或直梁）和压型钢板—混凝土组合桥面板构成。有限元分析结果表明,拱形或直梁桥面人行桥均具有较好的适用性。在最不利荷载工况作用下,拱形桥面较直梁桥面具有更大的刚度,有利于减小桥面变形;两种形式人行桥的主要自振模态均为扭转和面内弯曲,但拱形桥面人行桥具有更高的频率值,有利于提高行人舒适性。

关键词：张弦梁结构人行桥结构设计结构分析

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