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在建筑结构改造加固中,由于要拆除局部钢筋混凝土柱子和楼板,以形成无柱大空间尺寸,对大跨度梁的改造加固成为主要的难点。若单纯采用目前规范中提到的加固方法,很难有效解决问题。本文提出了单层钢筋混凝土桁架梁的形式,并简述了其几种结构形式,对其受力性能进行了对比分析,并分析了竖腹杆和斜腹杆的布置及其截面尺寸对桁架受力性能的影响,总结出钢筋混凝土桁架的受力特征。结合工程改造加固实例,提出合理布置斜腹杆和竖腹杆的钢筋混凝土桁架结构,并在改造加固中提出设计要点和建议。
In the structural transformation and reinforcement, due to the removal of local reinforced concrete pillars and slabs, to form a large column-free space size, the transformation of large-span beam reinforcement become the main difficulty. It is difficult to effectively solve the problem if only the reinforcement method mentioned in the current specification is adopted. In this paper, the form of single-story reinforced concrete truss girder is proposed and its structure types are briefly described. The mechanical properties of the single-layer reinforced concrete truss girder are compared and analyzed. The arrangement of the vertical web and the diagonal webs and the cross-sectional dimension of the truss Mechanical properties of the impact, summed up the reinforced concrete truss force characteristics. Combining with the examples of engineering reinforcement and reinforcement, the reinforced concrete truss structure with rational arrangement of diagonal webs and vertical webs is put forward and the design points and suggestions are put forward in the reformation and reinforcement.