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北京图书馆新馆13个栋号中有3个栋号为四坡型现浇钢筋混凝土椽式大屋顶,其余10个栋号为盝顶形式,其中最有代表性的是社会科学阅览楼的双重挑檐四坡大屋顶和报库的盝顶。社会科学阅览楼大屋顶最高点32.17m,图1为其平面分区示意,该屋顶结构采用现浇钢筋混凝土屋架与预制构件相结合的施工工艺。两翼Ⅰ、Ⅲ区屋顶梁的形式为实心的12m跨现浇混凝土的三角形屋架梁和跨度18m的斜梁。Ⅱ区屋架分为上、下两层,下层屋架长32m,宽31m;上层屋架长30m,宽22m。上层屋架有横梁5根,纵梁
Three of the 13 buildings in the new library of the Beijing Library have four-slope cast-in-situ reinforced concrete roofs. The remaining ten buildings are in the form of domes, the most representative of which is the social science reading building. Double provokes the dome of the four-slope roof and the library. The social sciences read the highest point of the roof of the building, which is 32.17m. Figure 1 shows the plane partition. The roof structure uses the construction technology of the combination of cast-in-place reinforced concrete roof truss and prefabricated components. The two-wing roof beams in the I and III areas are in the form of solid 12m-span truss girders with cast-in-place concrete and 18m-span oblique beams. The truss in Zone II is divided into two levels, the upper truss is 32m long and 31m wide. The upper truss is 30m long and 22m wide. Upper roof truss with 5 beams, longitudinal beams