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北京南河沿食品街商业楼和上海铁路新客站宾馆、公寓的裙房结构工程中采用了无粘结预应力悬挑梁,解决了由于跨度过大而产生的刚度不足的问题,改善了结构的受力状态和使用功能。悬挑梁最长为5.1m,梁高为0.8m,梁宽为0.3m,梁上线荷载约为4t/m,为加强悬臂梁的刚度,对每根挑出5.1m的悬臂梁内加配4φ~J15(总面积为5.72cm~2)无粘结预应力钢绞线。混凝土强度等级为C30,这样预应力筋将可平衡梁上线荷载约1.1
The non-bonded prestressed cantilever beam was used in the podium structure engineering of Beijing Nanheyan Food Street Commercial Building and Shanghai Railway New Passenger Station Hotel and Apartment to solve the problem of insufficient rigidity due to excessive span and improved the structure. Stress status and usage features. The longest cantilever beam is 5.1m, the beam height is 0.8m, the beam width is 0.3m, and the upper beam load of the beam is about 4t/m. To strengthen the stiffness of the cantilever beam, add 4φ to the cantilever beam with 5.1m of each pick. ~J15 (with a total area of 5.72cm~2) No bonded prestressed steel strands. The concrete strength grade is C30, so that the prestressed tendons will balance the beam load on the beam about 1.1