Nonlinear analysis of masonry structures using fiber-section line elements     

Matteo Peruch  Enrico Spacone  Guido Camata 《地震工程与结构动力学》2019,48(12):1345-1364

For seismic analysis of unreinforced masonry (URM) buildings characterized by a box-like behavior, a widely accepted model is based on the equivalent frame idealization of walls. The equivalent frame model uses 1D elements to represent the vertical piers and horizontal spandrels which are connected by rigid nodes. The mechanical characterization of the elements is one of the crucial aspects to predict reasonably the building seismic behavior. Through the comparison with pseudo-static and dynamic experimental tests performed on two-story full-scale buildings, this paper validates the frame modeling in the OpenSees framework, which includes a fiber-section force-based beam element for the axial-flexural behavior, coupled with a cyclic shear-deformation phenomenological law.  相似文献   

Nonlinear modeling of the seismic response of masonry structures: critical review and open issues towards engineering practice     

Cattari  Serena  Calderoni  Bruno  Cali&#;  Ivo  Camata  Guido  de Miranda  Stefano  Magenes  Guido  Milani  Gabriele  Saetta  Anna 《Bulletin of Earthquake Engineering》2022,20(4):1939-1997

Bulletin of Earthquake Engineering - This paper provides a comphrensive review of the critical aspects of nonlinear modeling for evaluating the seismic response of masonry structures, emphasizing...  相似文献   

Advanced frame element for seismic analysis of masonry structures: model formulation and validation          下载免费PDF全文

Eva Raka  Enrico Spacone  Vincenzo Sepe  Guido Camata 《地震工程与结构动力学》2015,44(14):2489-2506

This paper presents a masonry panel model for the nonlinear static and dynamic analysis of masonry buildings suitable for the seismic assessment of new and existing structures. The model is based on an equivalent frame idealization of the structure and stems from previous research on force‐based frame elements. The element formulation considers axial, bending, and shear deformations within the framework of the Timoshenko beam theory. A phenomenological cyclic section law that accounts for the shear panel response is coupled, through equilibrium between shear and bending forces along the element, with a fiber‐section model that accounts for the axial and bending responses. The proposed panel model traces with a low computational burden and numerical stability the main aspects of the structural behavior of masonry panels and is suitable for analyses of multi‐floor buildings with a relatively regular distribution of openings and with walls and floors organized to grant a box‐like behavior under seismic loads. The model capabilities are validated though analyses of simple unreinforced masonry panels and comparisons with published experimental results. The model accuracy is strongly dependent on the fiber and shear constitutive laws used. However, the formulation is general, and laws different from those employed in this study are easily introduced without affecting the model formulation. Copyright © 2015 John Wiley & Sons, Ltd.  相似文献   

A comparative study on a complex URM building: part II—issues on modelling and seismic analysis through continuum and discrete-macroelement models     

Castellazzi  G.  Pant&#;  B.  Occhipinti  G.  Talledo  D. A.  Berto  L.  Camata  G. 《Bulletin of Earthquake Engineering》2022,20(4):2159-2185

Bulletin of Earthquake Engineering - The paper presents the comparison of the results obtained on a masonry building by nonlinear static analysis using different software operating in the field of...  相似文献   

Uncertainty quantification in numerical simulation of particle-laden flows     

Gabriel M. Guerra  Souleymane Zio  Jose J. Camata  Jonas Dias  Renato N. Elias  Marta Mattoso  Paulo L. B. Paraizo  Alvaro L. G. A. Coutinho  Fernando A. Rochinha 《Computational Geosciences》2016,20(1):265-281

Numerical models can help to push forward the knowledge about complex dynamic physical systems. Modern approaches employ detailed mathematical models, taking into consideration inherent uncertainties on input parameters (phenomenological parameters or boundary and initial conditions, among others). Particle-laden flows are complex physical systems found in nature, generated due to the (possible small) spatial variation on the fluid density promoted by the carried particles. They are one of the main mechanisms responsible for the deposition of sediments on the seabed. A detailed understanding of particle-laden flows, often referred to as turbidity currents, helps geologists to understand the mechanisms that give rise to reservoirs, strategic in oil exploration. Uncertainty quantification (UQ) provides a rational framework to assist in this task, by combining sophisticated computational models with a probabilistic perspective in order to deepen the knowledge about the physics of the problem and to access the reliability of the results obtained with numerical simulations. This work presents a stochastic analysis of sediment deposition resulting from a turbidity current considering uncertainties on the initial sediment concentrations and particles settling velocities. The statistical moments of the deposition mapping, like other important features of the currents, are approximated by a Sparse Grid Stochastic Collocation method that employ a parallel flow solver for the solution of the deterministic problems associated to the grid points. The whole procedure is supported and steered by a scientific workflow management engine designed for high performance computer applications.  相似文献