张清允 ,陈志华,刘红波
AuthorsHTML:张清允 ^{1, 2}，陈志华 ¹ ，刘红波 ¹
AuthorsListE:Zhang Qingyun,Chen Zhihua,Liu Hongbo
AuthorsHTMLE:Zhang Qingyun^{1, 2}，Chen Zhihua¹，Liu Hongbo¹
Unit:1. 天津大学建筑工程学院，天津 300072；
2. 同济大学建筑设计研究院(集团)有限公司，上海 200092

Unit_EngLish:1. School of Civil Engineering，Tianjin University，Tianjin 300072，China；
2. Tongji Architectural Design，Shanghai 200092，China

Abstract_Chinese:双向索桁架屋盖结构是为实现超大跨空间而发展出的新结构形式，由空腹桁架与悬索的组合结构和索桁架 正交而成，分别为整体结构的主、次受力方向．对于大跨空间钢结构，具有非均匀性和时变性的环境作用影响其在 役期间实际的结构响应规律．以石家庄国际会展中心屋盖为例，基于双向索桁架屋盖结构的受力特点，设计了合理 的监测方案，对结构各构件的应力、索力、位移进行长期实测．以大量的服役期监测数据为依据，研究分析温度作 用及雨荷载作用下双向索桁架屋盖结构的构件应力、索力、位移响应规律，对比分析各构件的温度敏感性、雨荷载 敏感性．研究发现温度是双向索桁架屋盖结构在役期间影响其结构响应的关键因素．经过对比，发现主悬索桁架上 弦杆的温度敏感性最高，应力变化幅度最大可达设计值的 78%，位移变化幅值约为对应位置下弦杆的 1.5 倍．主悬 索桁架自锚杆与主悬索及横向索桁架的拉索温度敏感性相近，其中除柱侧一端受温度影响较小外，其余部位相应的 应力、索力变化幅度为设计值的 22%～32%．此外，通过对集中降雨时间段构件应力响应的计算分析，表明主悬索 桁架上弦杆对雨荷载的敏感性最高，应力变化最大幅度可达相应应力设计值的 20.6%．
Abstract_English:The bidirectional cable truss structure is a new form developed to realize a super-large span space. A combination of the vierendeel truss and suspension cable forms the structure of the main force direction，while the structure of the secondary force direction consists of the cable truss. Heterogeneous and time-varying environmental loads influence the structural performance of the large-span spatial steel structure. Taking the roof of Shijiazhuang International Convention and Exhibition Center as an example，a reasonable monitoring program was designed to record the law of stress，cable force，and displacement development on the account of mechanical characteristics. According to numerous monitoring data，the law under environment load was studied and temperature sensitivity and rain force sensitivity were analyzed. Temperature was observed to be a vital element. Through comparison，it is concluded that the temperature sensitivity of the upper chord of the main cable truss is the highest，the amplitude of stress variation is up to 78% of the designed value，and the amplitude of displacement variation is about 1.5 times than that of the lower chord of the corresponding position. Furthermore，the sensitivity of the self-anchored member and cable performed similarly with 22%—32% amplitude variation besides those located nearby the columns. These upper chords also showed higher sensitivity under the rain load，with the amplitude variation reaching up to 20.6%.
Keyword_Chinese:双向索桁架结构；监测；环境作用；结构响应；敏感性
Keywords_English:bidirectional cable truss structure；monitoring；environmental load；structure performance；sensitivity

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