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三角刚架是连续刚架拱桥最为重要的结构之一,通过广州新光大桥1∶10缩尺模型试验,研究三角刚架在施工及运营荷载作用下的应力发展和分布规律、抗裂性及承载能力。试验结果表明三角刚架在施工阶段以斜腿顶部拉应力控制设计,运营阶段以斜腿根部压应力控制设计,在正常使用荷载作用下三角刚架具有足够的抗裂安全性和承载力储备。
Triangular rigid frame is one of the most important structures of continuous rigid frame arch bridge. Through the 1:10 scale model test of Guangzhou Xinguang Bridge, the stress development and distribution law, crack resistance and bearing capacity of the triangular frame under construction and operation load are studied. ability. The test results show that the triangular frame is designed to control the tensile stress at the top of the slanting leg during the construction stage and is controlled by the compressive stress at the root of the slanting leg in the operating phase. The triangular frame has sufficient safety against cracking and the carrying capacity reserve under normal service load.