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空冷支架结构属电厂新型结构体系,结构体形相对复杂,下部为大直径混凝土管柱群,上部为设置挡风墙的空间平台,平台支撑着冷却设备。目前,仅DL 5022—2012《火力发电厂土建结构设计技术规程》给出了挡风墙的体型系数,其他部位风参数取值国家规范尚未涉及。由于平台上部A型布置的冷凝器属多孔透气构造,其表面风载体型系数取值无参考可言,抗风设计时有的风参数取值甚至不合理。通过刚性模型风洞试验及数值模拟,研究了冷凝器表面风压分布规律,获取了不同工况下冷凝器表面的风载体型系数,为空冷支架结构抗风设计提供基础资料。
Air-cooled stent structure is a new type of power plant structure system, the body shape is relatively complex, the lower part of the large-diameter concrete column group, the upper part of the installation of wind wall space platform, the platform supports the cooling equipment. At present, only DL 5022-2012 “Technical Code for Design of Civil Structure of Thermal Power Plants” gives the body coefficient of the wind wall, and the national norms for the value of other wind parameters have not been covered yet. Since the condenser arranged at the upper part of platform A is porous and breathable, the value of the surface wind-load coefficient is not referenced, and the wind parameters at wind-proof design are even unreasonable. Through the rigid model wind tunnel test and numerical simulation, the air pressure distribution on the condenser surface was studied. The wind load coefficient of the condenser surface under different conditions was obtained, which provided the basic data for the wind-resistant design of the air-cooled scaffolding structure.