Steel Staggered-truss System Research Articles

Analysis and Design of Multi-Storey Steel Staggered-Truss System

A Staggered Truss System (STS) is a brand-new idea in the construction of high-rise buildings. It is an effective design technique to improve efficiency in building construction. It was initially created in the 1960s at the Massachusetts Institute of Technology. By providing STS we can increase the strength and ductility of the building. It helps to cut down the number of interior columns and thereby reduce the cost of the building construction. This project involved using the ETAB software to undertake an analytical investigation into the seismic behaviour of a 16-storey steel staggered-truss system. The structural shape of the trusses was varied, and their influences on the seismic behaviours of the system were studied. The seismic performance of STS structures by varying the Vierendeel panel width was also evaluated. Time history analysis was used to analyse the models. From the analysis result maximum storey displacement, maximum storey drift and base shear are extracted. From the result, it was found that the model with warren trusses showed the highest strength and stiffness to the corresponding earthquake but all other truss shapes also achieved the target performance level and also the model with less Vierendeel panel width shows higher base shear and lower inter storey drift and displacement.

Experimental behaviors of steel staggered-truss system exposed to fire under lateral force

This paper presents an experimental investigation on structural behaviors of a six-storey steel staggered-truss system model with a scale of 1/10 under lateral force and fire exposure. Pan fire with the fuel of methanol was used to simulate a natural fire. The vertical and lateral loads were applied to tested model using counterweights. Temperatures, deformations and strains of the structure were measured. And probable failure mode of the system was obtained. The results indicate that it is hard to predict the failure of components in fire purely according to the load design of the structure at ambient temperature, due to the complicated redistribution of the internal force and the non-uniform temperature distribution. The mid-span of the top chord and the vertical web members at the center panel at the fire storey presented an obvious deformation during the test, while the components in the truss show a good compatibility. The impact of high temperature on lateral stiffness of the structure mainly concentrated on the storey exposed to fire, but rarely on the adjacent truss and the storey not exposed to fire.

Investigation on the Effect of Infilled Walls Utilizing Response Spectrum Analysis for Steel Staggered-Truss System

Considering the structure type of the steel staggered-truss (SST) system, the effect of infilled walls will be major and need to be studied amply, some scientific design regulations need to be found for referrence. Based on two different 3D models considering or ignoring the stiffness of infilled walls (SIW), a numerical investigation is presented on the structural behaviors of the SST system utilizing the finite element 3D simulation analysis soft ware ETABS. The longitudinal structure is asymmetrical due to the SIW, it causes the torsion forces in the building. Comparing to the different results of response spectrum analysis, including storey drift and equivalent base shear under frequent earth quake and rare earth quake, some conclusions were made, including the capacity of the SST system under seismic load and the effect of the SIW for SST system. The increased base shear force factors due to the effect of the SIW were suggested for SST structure design, it is different from the other steel structure types.

Dynamic Time History Analysis of the Effect of Infilled Walls on the Steel Staggered-Truss System

A structure with steel staggered-truss (SST) system is numerically investigated in this paper, utilizing the finite element 3D simulation analytial soft ware ETABS. Two different 3D models considering or ignoring the stiffness of infilled walls (SIW) are analyzed with Dynamic Time History method including storey drift and equivalent base shear force under frequent earth quake and rare earth quake. Results indicate that the effect of the SIW is prominent and should be considered.

Dynamic Time History Analysis of the Effect of Infilled Walls on the Steel Staggered-Truss System

A structure with steel staggered-truss (SST) system is numerically investigated in this paper, utilizing the finite element 3D simulation analytial soft ware ETABS. Two different 3D models considering or ignoring the stiffness of infilled walls (SIW) are analyzed with Dynamic Time History method including storey drift and equivalent base shear force under frequent earth quake and rare earth quake. Results indicate that the effect of the SIW is prominent and should be considered.

Investigation on Steel Staggered-Truss System RC Slab

For steel staggered-truss (SST) system, RC slabs are the main structure members to make the whole building work together beside to take the vertical load. There are openings in the RC slabs due to requirement of staircases、lift wells and other services, these openings will reduce the stiffness of RC slab and make stress concentration. Usually, the RC slab is designed under vertical load only, this will lead to the design defect and building calapse for SST structure. There are few research for SST RC slab are presented untill now. In the paper, based on two different 3D models considering or ignoring the stiffness of infilled walls (SIW), a numerical investigation is presented on the structural behaviors of the SST system utilizing the soft ware ETABS. As a finite element analysis method, the shell element is adopted for RC slab & infilled wall, the beam element is adopted for beam、colum and truss members. The structure is asymmetrical due to the SIW, it causes the torsional forces in the building and the extra stresses in the RC slabs, the additional reinforcement need to be provided to strengthen the high stress areas. Comparing with the results of response spectrum analysis under the combination with earth quake load, we make some conclusions, including the capacity of anti-seismic and the effect of the SIW for SST system RC slab，that could be a reference for SST structure design.

Investigation on Steel Staggered-Truss System RC Slab

Investigation on Steel Staggered-Truss System RC Slab

Investigation of the Plane Model of Steel Staggered Truss System

Steel Staggered Truss System (SSTS) is a new structural system with flexible arrangement, superior performance and good economy. A plane model was established with SAP2000 and the feasibility of the plane model to study the dynamic characteristics of SSTS under horizontal earthquake was discussed through performing modal analysis and pushover analysis to the space model and the plane model of SSTS. By comparing the response of models, it showed that the plane model changed the mechanical characteristics of SSTS, and there existed errors using the plane model to research on the dynamic characteristics of SSTS under horizontal earthquake

A Pseudo-Space Model of Steel Staggered Truss System

A pseudo-space model as a new model of Steel Staggered Truss System was proposed to assess the transverse seismic performance of the structure. Modal analysis and pushover analysis were performed on the space model and the pseudo-space model of SSTS with SAP2000. Through comparing the results of models, it showed that the pseudo-space model reflected the lateral force characteristics of the original structure, and could simulate the stress mechanism of the structure under transverse seismic.

Experimental study of the mechanical behavior of steel staggered truss system under pool fire conditions

Experimental research has been conducted to study the mechanical behavior and failure mode of a 6-storey steel staggered truss system (SSTS) model made in 1/8 scale without fire-proof coating exposed to pool fire. The data of temperature distribution, displacements and strains of typical members were obtained. The results indicate that with the increase in temperature, local buckling appeared primarily on vertical web members of the Vierendeel panel of the truss directly exposed to fire, which contributed to the destruction of the original balance of the internal force. Afterwards, several joints of the truss exposed to fire, which connected diagonal web members with chords, were fractured. Catastrophic destruction of the truss exposed to fire was then observed. It can be inferred that the destruction of the truss exposed to fire may lead to the collapse of the two storeys supported by the truss, which would present a huge threat to the whole structure for the potential progressive collapse might be aroused.

Simplified Model for Fire Resistance Analysis on Steel Staggered-truss System under Lateral Force

In order to investigate the simplified method for the fire resistance analysis on the steel staggered-truss system (SSTS) under the lateral force, a three-dimensional (3-D) model, a plane cooperative (PC) model and a planar model are established by the finite element method respectively. The effect of slabs is considered in the models. The mechanical performances of SSTS at elevated temperature were analyzed and the interaction characteristics between the truss exposed to fire and its adjacent trusses are studied. The results obtained by the above different models were comparatively investigated to explore the applicability of different models for the analysis of SSTS under lateral force and high temperature. The results indicate that the adjacent trusses in SSTS under lateral force could keep good coordination at elevated temperature. When applied to the analysis for SSTS under lateral force at elevated temperature, the 3-D model is the best in accord with actual situation while it is complicated and the computation is time-consuming, and the planar model is simple and convenient while it may cause some considerable deviation, and the PC model could simulate the interactions between adjacent frame truss and the truss under fire effectively in the SSTS, whose result is in the propinquity of 3-D model and has an acceptable accuracy. The PC model without rigidly hinged bars (RHB) on the fire floor is recommended to analyze the fire response behaviors of staggered-steel truss system under lateral force.

Experimental study and numerical analyses on seismic behaviors of staggered-truss system under low cyclic loading

An experimental investigation on the behavior of an 8-storey steel staggered-truss system with a 1 8 -scaled model under reversed low cyclic loading is presented in this paper. In the experiment, the hysteretic curves, skeleton curve as well as other related deformations are measured. And based on the test results, some indices of seismic behaviors of the system, such as yield load, deformation, ductility, energy dissipation, strength, and rigidity degeneration, are analyzed. However, due to the diversity of parameters of the steel staggered-truss system and the unique features of the tested model, the experimental study is not comprehensive enough. Therefore, an analytical investigation based on the finite element (FE) models using the ANSYS software is also presented. The FE models, in which both the material and geometric nonlinearity is considered, are validated using the experimental results. Then the parameters, such as the structural height and height–width ratio, truss type, arrangement of the ground floor trusses, truss span–depth ratio and open-web panel length, are varied, and their influences on seismic behaviors of the system are studied by the verified FE method. Based on the experimental and FE analytical results, some suggestions are presented for design of staggered-truss system.