Wind pressures in framed structures with semi-rigid connections

Abstract

In the analysis and design of framed structures, the traditional methods are based on the simplified assumption that the joints are completely either pinned or rigid. However, the experimental investigations show that the frame connections present an intermediate behaviour between these two extreme cases. The present work is concerned with the dynamic elastic analysis of semi-rigid plane frames subjected to wind pressures. The dynamic excitation induced by the wind is estimated by adopting the simulation method of Monte Carlo. The wind flutuation pressures are decomposed into a limited quantity of harmonic components that are then combined many times, making possible the accomplishment of a probabilistic analysis and the choice of a characteristic response. The frame is considered as a set of contiguous bar elements, connected to each other at the nodes, and the connections are modelled as zero-length rotational springs. A nodal description of the kinetic and kinematic laws is given under the restriction of small displacements. The behaviour of the frame material and connections is described by linear elastic moment-rotation relationships, which are presented in the stiffness form. In order to take into account the effect of the semi-rigid behaviour of beam-to-column connections, the mass and stiffness matrices are developed as the sum of the conventional finite element matrices and correction matrices that incorporate the flexibility of the end joints. The problem of forced vibrations is then solved by means of the numerical integration of the motion equations

Strain‐based joint damage estimation approach robust to unknown non‐stationary input force

“…With this definition of joint stiffness, several studies 1,7,60 developed the model of an Euler-Bernoulli beam supported on two semi-rigid joints e and f with end fixity factors P e and P f , respectively (cf. Figure 1).…”

Teaching-learning-based optimization of unbraced steel frames with semi-rigid connections and column bases

“…For simple models, Simoes [14] indicated a linear representation of spring in the analyses of semi-rigid frames. Moreover, Filho et al [15] adopted a linear approach and studied a 20-story steel frame using linear static analysis. In reality, the behavior of the connections along all moment-rotation curves is nonlinear [21].…”

“…His research showed a linear description of the spring for frames with semi-rigid connections. Soares Filho et al [15] explored the behavior of frame material and connections represented by linear elastic moment-rotation relationships in stiffness form. Choi and Kim [16] employed non-linear inelastic analysis to optimize the design of semi-rigid steel frames.…”

Finite Element Modeling of Fiber Reinforced Polymer-Based Wood Composites Used in Furniture Construction Considering Semi-Rigid Connections

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