Efficient semi-analytical generator of initial stiffness designs for steel frames under seismic loading. Part 2: Slender frame

1997 ◽  
Vol 6 (2) ◽  
pp. 163-170 ◽  
Author(s):  
Izuru Takewaki
Keyword(s):  
Steel Frames ◽  
Seismic Loading ◽  
Initial Stiffness

scholarly journals Studi Eksperimental: Perilaku Siklik Anticompression Split-K Braced Steel Frame

2020 ◽  
Vol 14 (2) ◽  
pp. 143-153
Author(s):  
Oksa Eberly ◽  
◽  
Sri Murni Dewi ◽  
Wisnumurti Wisnumurti ◽  
◽  
...  
Keyword(s):  
Steel Frames ◽  
Cyclic Strength ◽  
Steel Frame ◽  
Lateral Loads ◽  
Cyclic Tests ◽  
Initial Stiffness ◽  
Loading Tests ◽  
Quasistatic Loading ◽  
Cyclic Loading Tests ◽  
Good Behaviour

This paper presents an experimental study on the behaviour of a braced steel frame with a proposed system: anticompression brace system (ABS) subjected to cyclic lateral loads. The ABS is proposed to deal with common brace buckling problems. In the study, split-K braced steel frames: with ABS and with ordinary brace system (OBS) were used as speciments. Cyclic loading tests were conducted to evaluate the performance of the proposed system in preventing the brace to buckle and to obtain the behaviour of the frame with ABS compared to the frame with OBS under cyclic quasistatic loading. From the cyclic tests, it was observed that the proposed system worked in preventing the braces to buckle, hence, the aimed state, “buckling prevention” was achieved. The results of the study also show that the frame with ABS had a lower initial stiffness compared to the frame with OBS, nevertheless, after exceeding drift ratio of 0.85% based on raw data or 0.64% based on fitted-curves, the frame with ABS exhibited good behaviour through lower degradations in stiffness and cyclic strength relative to the frame with OBS that experienced sudden and greater degradations.

Analytical Models for Determining Rotational Capacity of Clip-Angle Connections under Seismic Loading

2014 ◽  
Vol 1025-1026 ◽  
pp. 979-986
Author(s):  
Jong Wan Hu ◽  
Hong Min Son
Keyword(s):  
Mathematical Models ◽  
Curve Fitting ◽  
Steel Frames ◽  
Seismic Loading ◽  
Full Scale ◽  
Analytical Models ◽  
Cyclic Loads ◽  
Structural System ◽  
Ductile Behavior ◽  
Partially Restrained

This paper explores rotational capacities and demands in thick top-and-seat (cleated) angle partially restrained connections subjected to monotonic and cyclic loads. The results of test on full-scale angle connections are described first, and are then compared to published curve-fitting models for these types of connections. The data indicates that the curve-fitting constants of some existing mathematical models cannot be extrapolated to thick angles. The results indicate that these connections are capable of providing very ductile behavior and constitute an ideal back-up structural system in steel frames.

Parameter Analysis for the Beam-to-Column Minor Axis Connections of Steel Frames

2013 ◽  
Vol 639-640 ◽  
pp. 155-159
Author(s):  
Xi Bing Hu ◽  
Da Chen ◽  
Guo Jing He
Keyword(s):  
Steel Frames ◽  
Internal Force ◽  
Minor Axis ◽  
Parameter Analysis ◽  
Engineering Practice ◽  
The Finite Element Method ◽  
Initial Stiffness ◽  
Traditional Assumption ◽  
The Relationship ◽  
Force Displacement

Base on the traditional assumption, beam-to-column minor axis connections are usually considered either as perfectly rigid or as nominally pinned. In fact, many researches show that beam-to-column minor axis connections are often semi-rigid, and their performance greatly effects the internal force, displacement, and ultimate bearing capacity of the steel frames, which cannot be neglected. Welded joint, one type of beam-to-column minor axis connections, which is widely used in the engineering practice is researched. The finite element method was used to analysis the relationship between the parameter variation and the rotational initial stiffness of the connections. The results can be used as a reference to the designs of steel frames.

Force-displacement relationship modelling of masonry infilled walls with openings in hinged steel frames

2021 ◽  
Author(s):  
Haoran Zuo ◽  
Weiping Zhang ◽  
Baotong Wang ◽  
Xianglin Gu
Keyword(s):  
Three Dimensional ◽  
Steel Frames ◽  
Structural Response ◽  
Displacement Curve ◽  
Initial Stiffness ◽  
Seismic Behaviour ◽  
Infilled Frames ◽  
Aspect Ratios ◽  
Three Dimensional Finite Element ◽  
Force Displacement

Abstract Seismic behaviour of masonry infilled frames has attracted extensive attentions from researchers, and it was found that infills normally experienced a diagonal compression under lateral loading. Infill was therefore assumed as an equivalent diagonal strut in structural response estimations of infilled frames, and a force-displacement curve was adopted to describe the mechanical properties of the strut. However, the influences of infill aspect ratio, vertical load acting on the surrounding frames, and opening were not systematically addressed in establishing the force-displacement relationship of infills. To investigate the effects of these influential parameters on the lateral responses of infilled walls including initial stiffness and strength, detailed three-dimensional finite element (FE) models of masonry infilled hinged steel frames are developed in ABAQUS in the present study, and a wide parametric study with respect to various aspect ratios, vertical loads, and opening sizes and locations is performed. A generalized force-displacement relationship model of infilled walls is proposed based on regression analyses of numerical results. The efficacy of the proposed model is examined by using the existing experimental test results, and it shows that the model can accurately predict the lateral stiffness and load carrying capacity of infilled walls and thus has great potential applications in structural designs and analyses for masonry infilled steel frames.

Behaviour of masonry infilled steel frames

1989 ◽  
Vol 16 (6) ◽  
pp. 865-876 ◽  
Author(s):  
J. L. Dawe ◽  
C. K. Seah
Keyword(s):  
Key Words ◽  
Ultimate Strength ◽  
Large Scale ◽  
Steel Frames ◽  
Shear Capacity ◽  
Test Series ◽  
Interface Conditions ◽  
Initial Stiffness ◽  
Roof Level ◽  
Major Crack

Masonry shear panels used as infilling in steel frames are investigated experimentally. Twenty-eight large-scale specimens were tested to ultimate panel strength under in-plane, horizontal loading applied at roof level. Of the parameters varied in the test series, interface conditions between panel edges and frame were found to significantly affect the strength and behaviour. Column-to-panel ties were found to be ineffective in increasing ultimate strength while initial stiffness was only marginally increased. A 20 mm gap between the upper edge of a panel and roof beam was particularly detrimental to the system shear capacity. While panel openings reduced initial major crack load, the same was not necessarily true for their effect on ultimate strength. Reinforced bond beams at one third and two thirds of the panel height forced initial major cracking to occur quite close to ultimate, which itself was only marginally increased. The lowest initial major cracking and ultimate loads were recorded for those specimens consisting of a panel in a hinge frame with a 20 mm gap between the upper edge of the panel and roof beam. Key words: masonry, infilled panel, steel frame, experimental, in-plane, behaviour, strength.

Cyclic testing and parametric analyses of the fabricated steel frames infilled with autoclaved aerated concrete panels

2016 ◽  
Vol 20 (4) ◽  
pp. 629-640 ◽  
Author(s):  
Cao Zhenggang ◽  
Du Peng ◽  
Fan Feng ◽  
Fang Ming
Keyword(s):  
Mechanical Properties ◽  
Numerical Models ◽  
Peak Load ◽  
Steel Frames ◽  
Cyclic Loads ◽  
Initial Stiffness ◽  
Concrete Panels ◽  
Autoclaved Aerated Concrete ◽  
Aerated Concrete ◽  
Beam Height

The influence of autoclaved aerated concrete panels on the mechanical properties of fabricated steel frames was experimentally investigated. Two fabricated steel frame specimens, which were with and without autoclaved aerated concrete panels, respectively, were tested under reversed cyclic loads. They were 1/2-scale, two-storey, and single-bay steel frames that were assembled by bolted beam-height adjustable steel beam-to-column connections. The effect of autoclaved aerated concrete panel dimensions on the mechanical behavior of infilled frames was also parametrically analyzed with the proposed numerical models which were verified on the basis of experimental data. The results indicate that the fabricated steel frames, assembled by beam-height adjustable connections, could behave in a ductile manner with sufficient stiffness and strength under cyclic loads; compared with bare steel frames, autoclaved aerated concrete panels could postpone the failure of structures and increase their initial stiffness, peak load, and energy dissipation capacity; moreover, the geometric details of autoclaved aerated concrete panels could significantly change the mechanical properties of infilled steel frames.

Sign in / Sign up

Export Citation Format

Share Document