开合结构（Retractable Structures）的出现与人类体育事业的发展密切相关，是当代人类物质文化生活水平发展到相当程度，人们对体育比赛场院馆功能要求日益完美的结果。
开合结构在大型体育馆、多用途体育场得到广泛应用。
Retractable structures have been widely adopted in large-sized palaestra and multipurpose buildings.
与传统的开合结构相比，构思独特，形式新颖，应用前景广泛。
Comparing with the traditional ones, it is imaginative, original, and has a widely application prospect.
由于开合结构的特殊性决定这类工程的设计不同于常规结构，存在较大难度。
Due to the particularity of retractable structure, design of this type of project must greatly differ from that of normal structure and be more difficult than the latter.
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