(1 同济大学建筑工程系, 上海 200092； 2 上海建筑设计研究院有限公司, 上海 200041)

［摘要］上海旗忠网球中心预应力混凝土看台结构体系新颖，施工工艺复杂。应用Bragg光栅光纤应变传感器、振弦式智能钢筋应力计以及混凝土应变计等先进传感器件，对看台结构在混凝土浇筑、预应力张拉以及钢屋盖吊装等关键施工阶段控制截面的混凝土、钢筋和预应力筋应力，整体与局部变形等进行了监测与研究。研究表明：在施工全过程中结构基本处于弹性工作状态，控制截面应力与结构变形均处于安全范围内；在预应力张拉前部分截面混凝土出现了较大的拉应力，但在张拉后结构基本处于全截面受压状态；对于预应力混凝土空间结构体系，宜采用先径向后环向的预应力张拉顺序；Bragg光栅光纤应变传感器、振弦式智能钢筋应力计以及混凝土应变计的工作性能稳定且精度较高，可应用于重大工程结构的施工过程监测。

［关键词］预应力混凝土；看台结构；施工监测；Bragg光栅

Study on construction monitoring for prestressed concrete stand of Shanghai Qizhong Tennis Center

Xue Weichen¹, Jiang Dongsheng¹, Xu Zhuangtao¹, Chen Yiyi¹, Lin Yingru²(1 Department of Building Engineering, Tongji University, Shanghai 200092, China; 2 Shanghai Institute of Architectural Design & Research Co., Ltd., Shanghai 200041, China)

Abstract:The structural system of Shanghai Qizhong Tennis Center is novel, and the construction is complicated. Fiber Bragg grating strain sensors, intelligent concrete sensors and steel bar sensors were used to monitor stresses of concrete, steel bars and prestressing tendons at the important sections of the prestressed concrete stand during the key construction stages, such as concrete casting, prestress stretching and the steel roof lifting and installing. Observations and investigations indicate that this structure is mainly in elastic range and the stresses and deformations remain in safety ranges during the global construction process; the tensile stresses of concrete in partial sections are relatively large before prestress stretching, but after prestress stretching the sections are all in compression; the radial tendons should be stretched prior to the circumferential tendons. It can be observed that fiber Bragg grating strain sensors, intelligent concrete sensors and steel bar sensors have stable behavior and high precision during prestress detecting, which are alternatives to be used in construction monitoring of important engineering structures.

Keywords:prestressed concrete; stand structure; construction monitoring; Bragg

上海旗忠森林体育城网球中心重点科研项目。

作者简介：薛伟辰，教授，博导,Email: Xuewc@tongji.edu.cn

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