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我县于1979年设计建造了一座20米变截面孤形刚架农村公路桥,通车已有两年多时间,至今未发现异常,使用情况良好。这种变截面孤形刚架桥(下称刚架拱桥)具有以下特点:第一、刚架拱的立柱直接支承在桥台底板上,立柱与上横梁连结在一起,使上横梁产生轴力,整个刚架拱片均为压弯构件,比较充分地利用了材料的抗压性能;第二、桥面结构与刚架片相结合,形成了共同作用的组合截面,利用桥面的抗弯性能分担了刚架拱片的部分弯矩;第三、刚架立柱略有倾斜,倾角为76°26′,并在立柱间搁置横向微弯板,代替了桥
My county in 1979 designed and built a 20-meter variable cross-section of the bridge frame road bridge, opened to traffic for more than two years, so far found no abnormalities, the use of good. This kind of variable cross-section arch-shaped rigid frame bridge (hereinafter referred to as rigid frame arch bridge) has the following characteristics: First, the column of rigid frame arch is directly supported on the platform of the abutment, the columns are connected with the upper beam to make the upper beam produce axial force , The entire rigid frame arch are bending members, more fully utilize the compressive properties of the material; second, the deck structure and rigid frame piece combined to form a combined effect of the combined cross-section, the use of bridge bending Performance sharing part of the bending moment of rigid frame arch; Third, the rigid frame column slightly inclined, inclination of 76 ° 26 ’, and placed between the columns horizontal micro-bent plate, instead of the bridge