Rui Simões

Experimental behaviour of end-plate beam-to-column composite joints under monotonical loading

An experimental research program on end-plate beam-to-column composite joints under monotonical loading is presented. The major focus relates to the identification of the contribution of the concrete confinement in composite columns to the behaviour of the joint, coupled with a thorough assessment of the various loading possibilities, ranging from symmetric and anti-symmetric loading on internal nodes to external nodes under hogging and sagging moments, typical in seismic regions. Comparison with current methodologies in the analysis of composite joints is also presented.

Database for the semi-rigid behaviour of beam-to-column connections in seismic regions

The behaviour of steelwork connections has long been recognised as complex. A database of test results for connection behaviour constitutes an essential step towards the development of design methodologies, allowing more researchers to investigate in this field without the financial burden of carrying out experimental work, avoiding being misled by incomplete or incorrect data, and opening the way to design assisted by testing. A database of experimental results for steel and steel-concrete composite connections is presented which encompasses graphical treatment of data, numerical manipulation and statistical treatment of groups of results, allowing easy comparison of connection behaviour. Simplified constitutive models for the hysteretic behaviour of connections are presented and included in the database for comparison and calibration with experimental results. The database SERIWWW was developed according to the following specifications: Possibility to introduce test results for any type of connection in free form format, irrespective of the type of connection (existent or not); Possibility to deal with any material; Possibility to deal with dynamical tests; Possibility to deal with numerical simulations; Easy interchange (import-export) with any commercial program (EXCEL, ACCESS, etc.); INTERNET on-line implementation. and implemented as independent modules which correspond to different levels of utilisation, as shown in Table 1. An experimental project of beam-to-column composite connection cyclic and dynamic tests currently under execution is presented where both con

Probabilistic models for mechanical properties of concrete, reinforcing steel and pre-stressing steel

This paper presents probabilistic models for mechanical properties of pre-cast and cast-on-site concrete as well as of reinforcing and pre-stressing steel. An extended review of models available in the literature is made and new probabilistic models are developed based on a significant amount of data collected by the authors. New probabilistic models are proposed for concrete ultimate strength (separately for precast and cast-in-place concretes), for yield and ultimate strength of reinforcing steel and for proportionality limit and ultimate strength of pre-stressing steel. The new models account for a recent improvement of production and are more appropriate for the probabilistic assessment of modern concrete structures then the models available in the literature.

Design of Steel Structures: Eurocode 3: Design of steel structures, Part 1-1 - General rules and rules for buildings

INTRODUCTION General Observations Codes of Practice and Normalization Basis of Design Ultimate limit states Serviceability limit states Durability Sustainability Materials Material specification Mechanical properties Toughness and through thickness properties Fatigue properties Corrosion resistance Geometric Characteristics and Tolerances STRUCTURAL ANALYSIS Structural Modelling, Worked Examples Global Analysis of Steel Structures, Worked Examples Classification of Cross Sections DESIGN OF MEMBERS Tension, Worked Examples Laterally Restrained Beams, Worked Examples Torsion, Worked Examples Compression, Worked Examples Laterally Unrestrained Beams, Worked Examples Beam-Columns, Worked Examples ELASTIC DESIGN OF STEEL STRUCTURES Simplified Methods of Analysis Amplified sway-moment method Sway-mode buckling length method Worked Example Member Stability of Non-prismatic Members and Components Non-prismatic members Members with intermediate restraints General method Worked Example Design Example 1: Elastic Design of Braced Steel-Framed Building PLASTIC DESIGN OF STEEL STRUCTURES 345 General Rules for Plastic Design Plastic limit analysis: method of mechanisms Code requirements for plastic analysis Methods of Analysis Approximate methods for pre-design Computational analysis 2nd order effects Worked Example Member Stability and Buckling Resistance General criteria for the verification of the stability of members with plastic hinges Bracings Verification of the stability of members with plastic hinges Worked Examples Design Example 2: Plastic Design of Industrial Building REFERENCES

Numerical implementation and calibration of a hysteretic model with pinching for the cyclic response of steel and composite joints

Publisher Summary The chapter presents a hysteretic model with pinching that is able to reproduce the cyclic response of steel and composite joints. The computer implementation and adaptation of the model in a spring element within the computer code Seismosoft is described in the chapter. The model is subsequently calibrated using a series of experimental test results for steel and composite joints subjected to cyclic loading. The chapter also proposes typical parameters for various joint configurations. The behavior of steel or composite joints under cyclic loading is characterized by hysteretic loops with progressive degradation of strength and stiffness that eventually leads to the joint failure. A typical natural event is usually approximated by cyclic loading is an earthquake. Usually, seismic events provoke relatively high amplitudes of rotation in the joint area so that steel repeatedly reaches the plastic range, and the joint fails after a relatively small number of cycles.

High-strength tower in steel for wind turbines (Histwin) : Final report

Innovative solutions for assembling joints of a tubular tower for wind turbines were studied and the project provides a background for design. This solution is simpler to produce and 80 % less expe ...