The moment-rotation curves of the tests demonstrated that this connection shows hollow sections), to date there has been no investigation of connections for. To date, Egyptian steel structure design codes ECP-ASD  and ECP-LRFD  do not Researches in end plate moment connection have been initiated in the last . The initial rotational stiffness defined as the slope of moment-rotation curve. MOMENT-ROTATION CHARACTERISTICS OF SHEAR CONNECTIONS OF THE EXPERIMENTS, THE EFFECT OF VARIATION OF EACH PARTICULAR PARAMETER ON THE MOMENT-ROTATION CURVE. Publication Date:
Meanwhile, the rate of the increase in the initial stiffness to the post-limit stiffness for the Hmax model increased by about Generally, the rate of the increase in the initial stiffness to the post-limit stiffness decreased with an increase in the thickness of the web and flange in the T to T T-stub joints.
Meanwhile, the maximum rotation for the Hmin model increased by about Generally, the maximum rotation increased with an increase in H from Hmin to Hmax.
Moment rotation curves for bolted connections
Meanwhile, the rotation capacity for the T model decreased by about The moment—strain responses for the nine full-scale specimens of steel-bolted connections with T-stub joints in the three groups are reported in Figure 5. These curves show that there is also a correlation between the moment—rotation and moment—strain plots of these two completely different tools, which can be taken as further proof of the installation and measurement precision.
As can be observed in Figure 5, at the point of failure for each specimen, all of the strains changed from elastic to plastic for the three groups of specimens. Figure 5 Moment—strain curves.
Three collapse modes were observed during the tests: The failure modes of the specimens appeared after necking positions on the beam of the T-stub connection, shear of bolts on the column of the T-stub connection, or rupture of the T-stub connection on the beam Figure 6b.
Furthermore, after the collapse, a V-shape appeared between the T-stub and column in the beam-to-column connection location. The maximum V-shape appeared in all three groups. In the design of steel frame structure, engineers design the beam-column connection as so called rigid joint or pinned connection to resist the lateral and reduce the lateral displacement efficiently of structures usually, but both types are the artificial assumptions, in practical engineering, all of the connections are the semi-rigid connections.
The investigation on the behavior of semi-rigid connection began in [ 1 F. Wu, Semi-rigid Connection in Steel Frames. Yee, "Moment-rotation curves for bolted connections", J. Chen, "A design model for semi-rigid connections", Eng.
The plastic hinge method has been widely used in nonlinear analysis of semi-rigid steel frame.
Experimental Behavior of Bolted T-Stub Connections with IPE Standard Profile
Liew and Kim [ 4 J. Chen, "Second-order refined plastic hinge analysis for frame design: Chen, "Practical advanced analysis for braced steel frames design", J. Yau, "Inelastic and stability analysis of flexibly connected steel frames by springs-in-series model", J. Hu shu-jun [ 7 S. Hu, "An efficient computational method for semi-rigid steel frame with elements of internal plastic hinge", J. A Saritas et al.
Ozel, "Modeling of the nonlinear behavior of steel framed structures with semi-rigid connections", In: The formulation of the element also considers the presence of linear or nonlinear behavior of semi-rigid connection behavior without additional nodes and degrees of freedom.
While the experimental and theoretical modeling of semi-rigid connections have been performed by researches, they are almost based on the assumption that the variables of structures are completely determined, which means evaluating the effects of variables on the structures by varying input parameters one at a time then holding other parameters at determined values with ignoring the relationship among these variables [ 9 C.
Gertner, "Uncertainty and sensitivity analysis for models with correlated parameters", Reliab.
The structure contains many parameters in the analysis of semi-rigid connections, there may be correlations between each parameter. These correlations impacted largly on the final output responses of the structures.