scholarly journals Assessment on the Progressive Collapse Resistance of a Long-Span Curved Spatial Grid Structure With Main Trusses

2021 ◽  
Author(s):  
Guangpan Zhou ◽  
Qianen Song ◽  
Aiqun Li ◽  
Shungao Shen ◽  
Qing Zhou ◽  
...  
Keyword(s):  
Progressive Collapse ◽  
Nonlinear Dynamic Analysis ◽  
Grid Structure ◽  
Load Path ◽  
Cross Sectional ◽  
Safety Control ◽  
Initial Failure ◽  
Long Span ◽  
Collapse Resistance ◽  
Spatial Grid

Abstract The present work is aimed at studying the progressive collapse resistance of the terminal building of Zhongchuan Airport in Lanzhou, China, which is a long-span curved spatial grid structure with main trusses. Firstly, the finite element model was built using MSC.Marc software. The alternate load path method (AP method) was used to simulate the initial failure of component. An improved method of zoned concept judgment and sensitivity analysis was proposed to determine the key components. Then, the initial failure components were removed individually on the course of analyzing. The responses of remaining structure were calculated using nonlinear dynamic analysis method. According to the results, the structure has a strong ability of resisting progressive collapse, though the structural responses are significant when removing the concrete filled steel tubular column directly supporting the roof at cantilever end. The maximum vertical displacement reaches 10 m. Moreover, the proposed method can avoid omitting the key components having significant influence on structural progressive collapse resistance. In addition, the influences brought by the cross-sectional sizes of chord and web members were investigated through conducting parametric analysis. The research can provide references for the structural optimization and safety control of similar long-span spatial structures.

Numerical Simulation of Progressive Collapse and Study of Resisting Progressive Collapse of Spatial Grid Structures Based on ANSYS/LS-DYNA

2011 ◽  
Vol 243-249 ◽  
pp. 6202-6205 ◽  
Author(s):  
You Liang Fang ◽  
Zhen Zong Zhao
Keyword(s):  
Numerical Simulation ◽  
Numerical Analysis ◽  
Design Method ◽  
Progressive Collapse ◽  
Reference Value ◽  
Grid Structure ◽  
Alternate Path Method ◽  
Spatial Grid

In this paper, different destruction forms of spatial grid structure are analyzed based on LS-DYNA. The key members of structure are studied and the collapsing processes of spatial grid structure caused by different failure members are simulated numerically. By comparing the results of numerical analysis, divisional design method is proposed based on the alternate path method (AP method). The divisional design method can improve resistance to progressive collapse obviously and is of certain reference value for engineering.

scholarly journals The Performance of Resistance Progressive Collapse Analysis for High-Rise Frame-Shear Structure Based on OpenSees

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Qiang Zhang ◽  
Yaozhuang Li
Keyword(s):  
Finite Element ◽  
Progressive Collapse ◽  
Shear Wall ◽  
Vertical Line ◽  
Initial Failure ◽  
Shear Structures ◽  
Collapse Resistance ◽  
Collapse Analysis ◽  
Shear Structure ◽  
The Impact

A finite element model (FEM) of frame-shear structure was constructed using OpenSees program based on the nonlinear flexibility theory and multi-vertical-line theory that considered bending-shear coupling, and its progressive collapse resistance under abnormal conditions was analyzed. Flexibility-based method for modeling shear wall finite element and multi-vertical-line element (SFI-MVLEM) was proposed. Method of deleting failure component elements was presented, as well as the model solving algorithm. The FEM was validated by the completed structure test. On these bases, 3 groups of typical frame-shear structure systems were designed to perform nonlinear dynamic collapse analysis under different initial failure conditions, in order to study the impact of the number of floors and earthquake resistant design on the progressive collapse resistance of frame-shear structures. Analysis results showed that, at initial failure of frame column, the residual shear wall element can well complete the internal force redistribution of structure to provide alternative force transmission path, thereby forming antiprogressive collapse force. In the case of initial failure of shear wall, C-shaped shear wall can form alternative path to diminish the vertical deformation of frame-shear structures. Final comparison shows that the structural seismic design can effectively improve their anticollapse performance.

scholarly journals Progressive Collapse Analysis of Latticed Telecommunication Towers under Wind Loads

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Shan Gao ◽  
Sheliang Wang
Keyword(s):  
Wind Direction ◽  
Progressive Collapse ◽  
Nonlinear Dynamic Analysis ◽  
High Standard ◽  
Wind Loads ◽  
Sensitivity Index ◽  
Load Path ◽  
Collapse Analysis ◽  
Telecommunication Towers ◽  
Progressive Collapse Analysis

As the antenna-supporting structures, latticed telecommunication steel towers are considered as critical members of telecommunication infrastructures. It is necessary to perform progressive collapse analysis of lattice telecommunication towers under wind loads. The present study conducts a nonlinear dynamic analysis on 50 m high typical standard latticed telecommunication tripole tower and angle tower by alternative load path method. The finite element models for two towers subjected to design wind loads are developed by ABAQUS. The analysis results show that, for 50 m high standard tripole tower, the member failure in the first three tower sections from tower top would not trigger the collapse of the tower. From the fourth tower section to tower bottom, the member failure at certain wind direction may cause a collapse. For 50 m high standard angle tower, the single member failure in any tower section would not cause the collapse of the tower. A dynamic sensitivity index is proposed to identify the most unfavorable wind direction for tripole tower and angle tower. A progressive collapse fragile curve based on collapse probability of telecommunication tower under wind loads is proposed to assess the anticollapse performance of the towers.

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