题目1：Topology Optimization Procedures for the Design of Reinforced Concrete and Prestressed Concrete
主讲人1：Dr. Oded Amir, Assistant Professor, Technion - Israel Institute of Technology
题目2：Optimization-based seismic retrofitting with viscous dampers
主讲人2：Dr. Nicolo Pollini, Postdoc, Technical University of Denmark
This seminar presentation exposes two topology optimization procedures that are intended for the design of reinforced concrete and prestressed concrete structures. In the former case, the distribution of both concrete and reinforcement bars is optimized simultaneously. Concrete is modeled as a continuum exhibiting damage, into which reinforcement bars are embedded. In the latter case, the distribution of concrete and the shape of the post-tensioning tendon are optimized simultaneously. The two procedures are strongly related as they both utilize special filtering techniques that couple the optimized distribution of continuum material (concrete) to that of discrete members or segments (rebars or tendons). Finally, the challenges of practical implementation in construction and the possible extension of these topology optimization procedures to other design problems, will be discussed.
Biography of Oded Amir:
Oded Amir is an Assistant Professor at the Faculty of Civil & Environmental Engineering, Technion – Israel Institute of Technology. He obtained his B.Sc. and M.Sc. degrees at the Technion, specializing in Structural Engineering. Oded received his Ph.D. degree from DTU – Technical University of Denmark at 2011, after which he stayed for another year as a post-doctoral fellow at the same university. He joined the Technion at 2012 and his main research field is structural optimization, with particular focus on topology optimization techniques. He is currently a visiting scholar at UCSD, while on sabbatical from Technion.
We present an optimization-based approach for minimum-cost seismic retrofitting of hysteretic frames with nonlinear fluid viscous dampers.
The proposed approach accounts also for moment-axial interaction in the structural elements, to consider a more realistic coupling between added dampers and retrofitted structure. The design variables of the problem are the damping coefficients of the dampers. Indirectly, the design involves also the stiffness coefficients of the supporting braces. In the optimization analysis, we minimize a realistic retrofitting cost function with constraints on inter-story drifts under a suite of ground motion records. The cost function includes costs related to the topological and mechanical properties of the dampers' designs. The structure is modeled with a mixed finite element approach, where the hysteretic behavior is defined at the beams' and columns' cross sections level. We consider damper-brace elements with a viscoelastic behavior characterized by the Maxwell model. The dampers' viscous behavior is defined by a fractional power law. Promising results are presented and discussed.
Biography of Nicolo Pollini:
Nicolo Pollini obtained his BSc and MSc degrees in civil engineering at the Politecnico di Milano in 2009 and 2012, and PhD degree in structural engineering at the Technion - Israel Institute of Technology in 2018. He is currently a post-doctoral researcher at the Technical University of Denmark. His research interests include topology optimization of conjugate heat transfer problems, optimal seismic retrofitting, and lightweight cable structures.
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