渭城中学体育馆新型预应力拉索-钢筋混凝土组合大跨度梁设计

Design of new prestressed cable-reinforced concrete composite large-span beam of Weicheng Middle School Gymnasium

渭城中学体育馆位于高烈度区且场地类别为Ⅲ类,抗震设防类别为重点设防类,地震作用是该结构的控制作用,减小结构重量成为了总体设计的关键。鉴于上述因素,针对本工程,提出了新型预应力拉索-钢筋混凝土组合大跨度梁,该梁由钢筋混凝土梁、竖向V形撑杆、预应力拉索组成,能充分发挥拉索和混凝土材料的特性,其中钢筋混凝土梁的跨高比仅有1/29。重点介绍了该梁几何构成、平面布置、设计方法和原则,并对大跨度预应力楼盖的舒适度进行了评估。结果表明,在大跨度预应力楼盖中,采用钢筋混凝土与预应力拉索共同受力的大跨度结构,可以实现楼盖较大的高跨比,经济性较好,楼盖竖向振动舒适度较高。相比普通预应力混凝土梁,采用该梁能大幅度降低了结构自重,同时降低了地震作用。

Weicheng Middle School Gymnasium is located in high-intensity area, the site category is Ⅲ, the seismic fortification category is the key fortification category, and the earthquake action is the controlling action of the structure, and structural weight reduction is key to the overall design. In view of the above factors, new prestressed cable-reinforced concrete composite large-span beam was proposed for this project, the beam consists of reinforced concrete beams, vertical V-shaped struts, and prestressed cables, which can give full play to the characteristics of cables and concrete materials, and the span-to-height ratio of reinforced concrete beam is only 1/29. The geometrical composition, plan layout, design method and principle of the beam were mainly introduced. And the comfort of large-span prestressed floor was evaluated. The results show that using a large-span structure coupled with reinforced concrete and prestressed cables in a large-span floor can achieve a larger height-span ratio of the floor and economy is better, and vertical vibration comfort of the floor is higher. Compared with ordinary prestressed concrete beams, the self-weight of the structure is greatly reduced by adopting the beam, and the earthquake action is reduced.