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由贵州工学院勘察设计院与清远市建筑设计院合作设计的清远市体育馆屋盖结构,采用了组合式预应力三向双曲扭网壳钢结构,对角线跨度达93米,在国内外尚属首例。对网壳进行六边同步张拉施加预应力,可节省钢材约25%,获得显著经济效益。由于影响因素众多,结构受力十分复杂,为确保预应力适当和实施过程安全可靠,采用UCAM-70A多通道应变仪对网壳结构进行了应力应变静态测试和动态监测。实践表明,测试对修正预应力张拉力,指导结构补强,验证理论计算的准确性,评定结构的可靠性起到了很好的作用,并为今后类似结构的设计和施工获得了宝贵的数据资料。
The Qingyuan Gymnasium roof structure designed by the Cooperation Institute of Survey and Design of Guizhou Institute of Technology and the Architectural Design Institute of Qingyuan City adopts a combined prestressed three-way hyperbolic twisted shell steel structure with a diagonal span of 93 meters at home and abroad. This is the first case. Six-sided simultaneous tensioning of the reticulated shells exerts prestressing, which can save about 25% of the steel and obtain significant economic benefits. Due to the large number of influencing factors, the structural stress is very complex. In order to ensure the proper prestress and the safety and reliability of the implementation process, the UCAM-70A multi-channel strain gage is used for the static and dynamic stress and strain monitoring of the lattice shell structure. Practice shows that the test has played an important role in correcting prestressed tension, guiding structural reinforcement, verifying the accuracy of theoretical calculations, and assessing structural reliability, and has obtained valuable data for the design and construction of similar structures in the future. .