Abstract
The progressive collapse resistance of the terminal building of Zhongchuan Airport in Lanzhou, China was studied, which is a long-span curved spatial grid structure with main trusses. Firstly, the finite element model was built using MSC. Marc software adopting the fiber model based on material. Secondly, an improved method of zoned concept judgment and sensitivity analysis was proposed to determine the key components. Thirdly, the initial failure components were removed individually based on the alternate load path method (AP method). The responses of remaining structure were calculated using nonlinear dynamic analysis method. Lastly, the influences brought by the cross-sectional sizes of grid members were investigated through conducting parametric analysis. According to the results, the proposed selection method can avoid omitting the key components. The structural responses are significant when removing the concrete filled steel tubular (CFST) column SC14 directly supporting the front middle part of the roof, with a maximum vertical displacement of 10 m at cantilever end, which should be focused on for this kind of large-span spatial structure. In addition, the tensile strength and cross-sectional area of the upper and lower chords should be increased by 20% to enhance the progressive collapse resistance of the structure, and the changes of axial compression ratios of the columns supporting the roof have little effects.
Highlights
Nowadays, the structural collapse accidents occur frequently in China, resulting in huge casualties and economic losses, especially the collapses of public buildings with large pedestrian flow and complex structural forms, such as airport terminal buildings, railway station buildings, etc
The cross-sectional sizes and material parameters of the preliminarily selected columns are shown in Table 2, which were numbered as SC1~SC16, including circular concrete filled steel tubular (CFST) columns and square steel pipe columns
We focused on the progressive collapse resistance of the terminal building of Lanzhou Zhongchuan Airport in China, which is a large-span curved spatial grid structure with main trusses
Summary
The structural collapse accidents occur frequently in China, resulting in huge casualties and economic losses, especially the collapses of public buildings with large pedestrian flow and complex structural forms, such as airport terminal buildings, railway station buildings, etc. The researches on the progressive collapse of building structures began from the collapse of Ronan Point Apartment Building in England in 1968, caused by the gas pipe explosion. Building in America caused by the terrorist attack of car bomb in 1995 marked the beginning of the second research stage of progressive collapse. Corley et al (1998) studied the collapse mechanism of Murrah Building and the measures that should be taken, and summarized the structural design process for reference. Longinow and Mniszewski (1996) discussed the damage mechanism of Murrah Building under the explosion, and put forward that the load can be redistributed to effectively prevent the continuous damage of statically indeterminate structure under bomb attack, such as steel frame and cast-in-place concrete frame. The third research stage of progressive collapse began from the 9/11
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