Topology Optimization of Bridges Supported by a Concrete Shell

Briseghella, Bruno; Fenu, Luigi; Feng, Yulin; Mazzarolo, Enrico; Zordan, Tobia

doi:10.2749/101686613x13363929988214

Cited by 25 publications

(7 citation statements)

References 2 publications

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“…For a design of rectilinear floors in the beam-slab layout, a genetic algorithm-based technique was proposed by Nimtawat and Nanakorn [15,16]. Briseghella et al [17] emphasized that the tension zone inevitable stresses could be taken care of by material-removing from the shell regions in which bending occurs. This creates voids in concrete that satisfy conditions of topology optimization.…”

Section: Introductionmentioning

confidence: 99%

Impact Response of Hammerhead Pier Fibrous Concrete Beams Designed with Topology Optimization

Salaimanimagudam

Suribabu

Murali

et al. 2020

Period. Polytech. Civil Eng.

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Reducing the weight of concrete beams is a primary (beyond strength and durability) concern of engineers. Therefore, this research was directed to investigate the impact response of hammerhead pier concrete beams designed with density-based method topology optimization. The finite element topology optimization was conducted using Autodesk fusion 360 considering three different mesh sizes of 7 mm, 10 mm, and adaptive meshing. Three optimized hammerhead beam configurations; HB1, HB2, and HB3, respectively, with volume reductions greater than 50 %. In the experimental part of this research, nine beams were cast with identical size and configuration to the optimized beams. Three beams, identical to the optimized beams, were tested under static bending for verification purposes. In comparison, six more beams, as in the preceding three beams but without and with hooked end steel fibers, were tested under repeated impact load. The test results revealed that the highest flexural capacity and impact resistance at crack initiation and failure were recorded for the adaptive mesh beams (HB3 and HB3SF). The failure impact energy and ductility ratio of the beam HB3SF was higher than the beams HB1SF and HB2SF by more than 270 %. The results showed that the inclusion of steel fiber duplicated the optimized beam’s impact strength and ductility several times. The failure impact resistance of fibrous beams was higher than their corresponding plain beams by approximately 2300 to4460 %, while their impact ductility ratios were higher by 6.0 to 18.1 times.

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Section: Introductionmentioning

confidence: 99%

Impact Response of Hammerhead Pier Fibrous Concrete Beams Designed with Topology Optimization

Salaimanimagudam

Suribabu

Murali

et al. 2020

Period. Polytech. Civil Eng.

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“…A new technique for column design for orthogonal structures was developed by Shaw et al [10]. Briseghella et al [11] emphasized that the tension zones inevitable stresses could be taken care of by material-removing from the shell regions in which bending occurs. This produces more voids in concrete, which satisfy the conditions of topology optimization.…”

Section: Introductionmentioning

confidence: 99%

Study of Topology Optimized Hammerhead Pier Beam Made with Novel Preplaced Aggregate Fibrous Concrete

Karthikeyan

2020

Period. Polytech. Civil Eng.

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This study aims to study topology Optimized Hammerhead Pier Beam (TOHPB) designed with a density-based technique. TOHPB is made with Preplaced Aggregate Fibrous Concrete (PAFC), which comprises two main preparation processes. First, the fibers and coarse aggregates filled into empty formwork to develop a skeletal system. Second, voids in the skeletal system are filled with cement grout; hence a type of PAFC was obtained. Besides, alleviating the self-weight of the concrete beam is a top priority of design engineering without compromising its strength and durability. The effect of topology optimization in association with the safety of factors and elastic design case is considered in this study. Explicitly, (i) compliance is scaled down to a minimum under a perimeter on the utilized material (ii) the principle Drucker-Prager is employed to impose the stress limitations even though utilization of material is minimized. The problem is designed with imposed stress limitation and generates keys that involve an essential part of post-processing before fabrication. In total, ten TOHPB were prepared with and without the combined shape of crimped-hooked end steel fiber. Two different types of fiber reinforcement schemes were used; first, the fibers were reinforced to full beam cross-section; then, the fibers were reinforced to the top half of the beam cross-section. Results revealed that the TOHPB beam reinforced full cross-section exhibited better ultimate load performance than that of the beam with half reinforced cross-section.

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“…It is well known that structural optimization is an important tool, both for sizing structure members and for helping the designer find the most suitable structural form [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. Today, structural optimization is common in mechanical and aeronautical engineering, and in recent years it has been progressively adopted for structural-engineering applications, such as sizing building and bridge members [29][30][31][32][33][34][35][36], detailing reinforced concrete structures [37][38][39][40][41][42][43][44][45], shaping bridges [46][47][48][49][50], domes [51][52][53][54], and other threedimensional structures [55].…”

Section: Introductionmentioning

confidence: 99%

A Heuristic Approach to Identify the Steel Grid Direction of R/C Slabs Using the Yield‐Line Method for Analysis

Fenu

Colasanti

Congiu

et al. 2019

Advances in Civil Engineering

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In the last few years, nonregular reinforced concrete (R/C) slabs have become more popular in buildings and bridges due to architectural or functional requirements. In these cases, an optimum design method to obtain the ultimate load capacity and the minimum reinforcement amount should be used. For simple R/C slabs, the yield-line method is extensively used in engineering practice. In addition to strength, the “true” failure mechanism is also obtained by identifying the parameters that define it and minimizing the collapse load. Unfortunately, when the mechanism is too complicated to be described or defined by several parameters (e.g., in slabs with complicated geometry), the method becomes more difficult because the system of nonlinear equations becomes harder to solve through traditional methods. In this case, an efficient and robust algorithm becomes necessary. In this paper, a structural analysis of R/C slabs is performed by using the yield-line method in association with a zero-th order optimization algorithm (the sequential simplex method) to avoid calculating gradients as well as any derivatives. The constraints that often limit these parameters are taken into account through the exterior penalty function method, leading to a successful solution of the problem. Considering that the direction of each yield-line is sought by minimizing the ultimate load and finding the parameters defining the collapse mechanism, another parameter concerned with the direction of an orthotropic reinforcement grid is introduced. In this way, the number of unknown parameters increases, but aside from obtaining the ultimate load and the parameters defining the collapse mechanism, the solution also finds both best and worst reinforcement orientations.

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Topology Optimization of Bridges Supported by a Concrete Shell

Cited by 25 publications

References 2 publications

Impact Response of Hammerhead Pier Fibrous Concrete Beams Designed with Topology Optimization

Impact Response of Hammerhead Pier Fibrous Concrete Beams Designed with Topology Optimization

Study of Topology Optimized Hammerhead Pier Beam Made with Novel Preplaced Aggregate Fibrous Concrete

A Heuristic Approach to Identify the Steel Grid Direction of R/C Slabs Using the Yield‐Line Method for Analysis

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