Influence of Composite Slab on the Nonlinear Response of Extended End-Plate Beam-to-Column Joints

2018 ◽  
Vol 763 ◽  
pp. 818-825 ◽  
Author(s):  
Roberto Tartaglia ◽  
Mario D'Aniello ◽  
Gian Andrea Rassati ◽  
James A. Swanson ◽  
Raffaele Landolfo
Keyword(s):  
Concrete Slab ◽  
Lateral Loads ◽  
Building Frames ◽  
Beneficial Effects ◽  
End Plate ◽  
Composite Joint ◽  
Extended End Plate ◽  
Plate Connections ◽  
Seismic Area ◽  
Steel Joints

Extended stiffened end-plate connections are widely used in seismic area due to their good performance in terms of both resistance and ductility. The most of existing studies focused on the all-steel behavior of these joints, disregarding the composite action of the concrete slab that is generally disconnected. However, the presence of the concrete slab can have beneficial effects on the structural stiffness for both gravity and lateral loads. Hence, most of the building frames are usually designed considering steel-concrete composite solution. However, the slab can strongly influence the hierarchy between beam and column and the ductility of the joint. In this paper the influence of composite deck on the response of extended stiffened end-plate joins has been investigated by means of finite element analyses (FEAs). In particular, the following details have been investigated: (i) all steel joints without slab; (ii) steel joint with disconnected slab; (iii) composite joint.

scholarly journals Numerical testing of steel beam-to-column bolted extended end-plate connection with haunches

2019 ◽  
Vol 29 ◽  
pp. 02008
Author(s):  
Dominiq Jakab ◽  
Aurel Stratan ◽  
Dan Dubina
Keyword(s):  
Material Model ◽  
Tensile Tests ◽  
End Plate ◽  
Numerical Testing ◽  
Experimental Campaign ◽  
Moment Resisting ◽  
Extended End Plate ◽  
Plate Connections ◽  
Plate Connection ◽  
Steel Joints

During the European research project entitled EQUALJOINTS (European pre-Qualified steel JOINTS) [1], which recently concluded, the matter of providing a set of pre-qualification procedures for moment resisting beam-to-column connections which are currently used in Europe has been addressed. During the experimental campaign 24 specimens with bolted extended end-plate connections with haunches were tested. The current paper presents the numerical model which has been developed such that numerical testing may be performed to further investigate specific details. In what concerns the material, an isotropic material model has been calibrated and used based on tensile tests of coupons extracted from the specimens to model the actual plastic behaviour. Moreover, the imperfections of the beam have been taken into account using a bucking analysis to model as accurate as possible the specimens tested. The interaction between parts has been modelled using contacts with different interaction laws. The model used for the bolt has been calibrated such that the preloading and failure replicate the behaviour of the actual bolts used in the experiments.

scholarly journals Experimental Investigation on the Mechanical Behavior of Semi-Rigid Composite Joints Loaded along the Minor-Axis

2015 ◽  
Vol 9 (1) ◽  
pp. 12-20
Author(s):  
Shizhe Chen ◽  
Zhan Wang ◽  
Chao Zhou ◽  
Panyuan Chen
Keyword(s):  
Mechanical Behavior ◽  
Concrete Slab ◽  
Minor Axis ◽  
Composite Joints ◽  
Composite Joint ◽  
Seat Angle ◽  
Bare Steel ◽  
Plate Connections ◽  
Rigid Joints ◽  
Steel Joints

Today’s design of spatial steel frames requires beam-to-column connections to be checked in the direction of the minor-axis of inertia of beam section. The mechanical behavior of minor-axis connections for bare steel joints and composite joints has been investigated by experiments. A comparison of the experimental results between the bare steel joints and composite joints shows that the mechanical behavior of the minor-axis composite joint is obviously effected by the reinforcing concrete slab, which is transversely reinforced for bending and is connected to the steel beam via shear studs, this is more in line with the mechanical behavior of the frame joint. The investigation indicates that: (1) Minor-axis joints with flush end-plate connections and seat angle with double web angles connections are all typical semi-rigid joints. The bearing capacity and the rotation ability of the joints cannot be ignored in the design. (2) Due to the composite effects of the reinforcing concrete slab, sagging moment and hogging moment must be taken into consideration when the mechanical model is established using component method.

scholarly journals Numerical model of beem-to-column joint finite stifness

Vestnik MGSU ◽  
2019 ◽  
pp. 179-187
Author(s):  
Ruslan I. Bagautdinov ◽  
Zaur S. Daurov ◽  
Yuriy P. Komarov ◽  
Nikolaiy N. Mostovskiy
Keyword(s):  
Numerical Modeling ◽  
Design Procedure ◽  
Steel Structures ◽  
End Plate ◽  
Seat Angle ◽  
Secant Stiffness ◽  
Extended End Plate ◽  
Plate Connections ◽  
The Moment ◽  
Steel Joints

Introduction. One of the greatest accents in the steel structures researches is the optimization of the design model. It is possible to reduce the cost of steel structures, optimize moment distribution and dynamic characteristics of the frame using the finite secant stiffness, which can be obtained by the described in the paper numerical modeling method. There are a lot of perspectives for the engineer in the field of numerical modeling. Most of them are possible to implement in the design procedure nowadays, but it is important to develop methods and standards for numerical modeling, in order to obtain convenient tools and reliable results. In order to study this issue in more depth, the “moment - turn” curve was studied, maximum stress values were determined, and rigidity and strength characteristics were prepared for each type of joint for structural analysis. Materials and methods. In the program Ansys was modelling three types of steel joints: end-plate connections, double web-angle connections and top and seat angle connections. Results. For three types of joints was obtained ultimate moment, location of destruction and moment-rotation curve. For extended end-plate connections was comparison of the obtained curve with experimental data. Conclusions. Three types of steel joints were modeled in the paper. The numerical modeling results show good correlation with the experimental ones. The data about the behavior of the joints were extracted and analyzed. As result, “moment-angle of rotation” curves were obtained. Finite secant stiffness of the joints for considering steel structures was obtained in the analysis. The resulting finite secant stiffness can be used in the steel frames design procedure.

Analysis on the Seismic Behavior of Extended End-Plate Connections of Steel Frame Structure

2012 ◽  
Vol 193-194 ◽  
pp. 1405-1413 ◽  
Author(s):  
Zhu Ling Yan ◽  
Bao Long Cui ◽  
Ke Zhang
Keyword(s):  
Finite Element ◽  
Cyclic Loading ◽  
Seismic Performance ◽  
Seismic Behavior ◽  
Frame Structure ◽  
End Plate ◽  
Rigid Connection ◽  
Extended End Plate ◽  
Plate Connections ◽  
Steel Frame Structure

This paper conducts analysis on beam-column extended end-plate semi-rigid connection joint concerning monotonic loading and cyclic loading of finite element through ANSYS program, mainly discussed the influence of parameters such as the form of end plate stiffening rib on anti-seismic performance of joint.

scholarly journals Experimental assessment of the ductility of extended end plate connections

2004 ◽  
Vol 26 (9) ◽  
pp. 1185-1206 ◽  
Author(s):  
Ana M. Girão Coelho ◽  
Frans S.K. Bijlaard ◽  
Luís Simões da Silva
Keyword(s):  
Experimental Assessment ◽  
End Plate ◽  
Extended End Plate ◽  
Plate Connections

Sustainable and Deconstructable Semi-Rigid Flush End Plate Composite Joints

2014 ◽  
Vol 553 ◽  
pp. 557-563 ◽  
Author(s):  
Abdolreza Ataei ◽  
Mark A. Bradford
Keyword(s):  
Concrete Slab ◽  
Load Capacity ◽  
Steel Beam ◽  
Composite Joints ◽  
Fe Modelling ◽  
Shear Connectors ◽  
End Plate ◽  
Composite Systems ◽  
Composite Joint ◽  
Non Linear

Composite construction is a popular and effective method of construction, exploiting the strengths of both reinforced concrete and structural steel in building construction in a complementary fashion. Within paradigms related to minimisation of emissions and maximisation of product recycling, these composite systems are problematic on a number of fronts. Firstly, common and traditional composite systems utilise ordinary Portland cement, which is known to be a very large contributor to atmospheric CO2 emissions. Secondly, for typical construction practices for steel-concrete composite systems, casting of the concrete onto profiled steel decking and conventional reinforcement placing are undertaken on-site, which is time consuming and labour intensive, and which can increase the cost of construction. Thirdly, composite action between the steel beam and the concrete slab is usually achieved by using headed shear studs. The headed shear studs connect these two elements permanently, which leads to much waste at the end of the service life of the building when it is demolished. This paper models a sustainable semi-rigid beam-to-column composite blind bolted connection with deconstructable bolted shear connectors using ABAQUS finite element (FE) software. In this “green” system, precast geopolymer concrete (GPC) slabs are attached compositely to the steel beam via pretensioned bolted shear connectors and the composite beam is connected to GPC-filled square columns using blind bolts. Non-linear material properties and non-linear geometric effects are considered in the simulation of a connection in hogging bending. Based on the FE modelling, using pretensioned bolts as shear connectors with GPC can improve the behaviour of semi-rigid flush end plate composite joints in terms of ductility and load capacity. Moreover, the behaviour of the bolted shear connectors should be considered in composite joint design as being very different to headed stud connectors.

Experimental Investigation of Retrofitted Extended End-Plate Connections

2013 ◽  
Vol 284-287 ◽  
pp. 1330-1333
Author(s):  
Poi Ngian Shek ◽  
M.Md. Tahir ◽  
Cher Siang Tan ◽  
Arizu Sulaiman
Keyword(s):  
Experimental Tests ◽  
Horizontal Shear ◽  
Initial Stiffness ◽  
Component Method ◽  
End Plate ◽  
Theoretical Predictions ◽  
Extended End Plate ◽  
Plate Connections ◽  
The Moment ◽  
Plate Connection

A series of retrofitted extended end-plate connections have been tested experimentally and evaluated using the component method specified in Eurocode 3. The component method decomposed the end-plate connection into several components, including the tension zone, compression zone, vertical and horizontal shear zone that occurred at the bolt, end-plate, beam and column. Based on the theoretical model, the moment resistance and the initial stiffness of a connection can be predicted. Four experimental tests on the retrofitted extended end-plate connections have been conducted to verify the proposed design method. From the experiment tests, all moment resistance of the connections showed good agreement with theoretical predictions, which establish a reliable foundation to predict the moment resistance of the retrofitted end-plate connection. All initial stiffnesses calculated from theoretical predictions do not represent the actual behaviour of tested connection. All tested connections can be classified as partial strength based on EC 3: Part 1.8, in condition the welding capacity is at least 50% higher than the capacity calculated from the component method.

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