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介绍加拿大魁北克省舍布鲁克市的一座跨度为 6 0 m的预制预应力人行 /自行车桥的设计、施工及监测情况。该桥在材料选用和结构设计上都有创新 ,它采用无普通钢筋的后张预应力空腹空间桁架取代了腹板 ,并将全桥分为 6个预制节段 ,用匹配法浇注施工。该桥的特点是采用了活性粉掺合料混凝土 (Reactive Powder Concrete,以下简称活性粉混凝土 ) ,其上下弦杆的活性粉混凝土的抗压强度达到了 2 0 0 MPa。斜腹杆由不锈钢管构成 ,管内填充活性粉混凝土以提高韧性 ,其抗压强度达到了 35 0 MPa。舍布鲁克人行桥的实践表明 ,活性粉混凝土的优良特性使其在桥梁工程方面有着极其广泛的应用前景
Describe the design, construction and monitoring of a 60m precast prestressed pedestrian / bicycle bridge in Sherbrooke, Québec, Canada. The bridge is innovative in material selection and structural design. It replaces the web with the post-tensioned prestressed fasting space trusses without ordinary steel and divides the full bridge into 6 prefabricated sections, which are cast by matching method. The bridge is characterized by the use of reactive powder concrete (Reactive Powder Concrete, hereinafter referred to as reactive powder concrete), the upper and lower chords of activated powder concrete compressive strength reached 200 MPa. Diagonal web consists of stainless steel tube filled with activated powder concrete to improve toughness, the compressive strength reached 35 0 MPa. The practice of the Sherbrooke footbridge shows that the excellent properties of the activated powder concrete make it has a very broad application prospect in bridge engineering