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予应力钢结构由于采用了高强度钢材做为予应力杆件,并对结构施加予应力,因而可以取得节约钢材(20～30)%的经济效果. 我国自六十年代开始,这种结构较为广泛地在输煤栈桥中得到了推广采用,取得了较好的效果.但是所有已建成的予应力钢栈桥都是采用二级或三级粗钢筋做予应力筋.由于这些钢筋的强度并不很高,因而取得的经济效果并不显著,同时也限制了予应力钢结构向大跨度的方向发展. 西北电力设计院为大武口发电厂设计了60米跨的予应力钢栈桥,第一次采用了抗拉强度高达16000公斤/平方厘米的钢铰线做予应力杆件,用铰JM12-6型锚具进行锚固.和普通钢栈桥相比,取得了节均钢材31%的良好效果.不但为提高予应力钢结构的经济效果创造了条件,而且也为这种结构向更大跨度的方向发展开辟了新的途径. 高强度钢铰线及铰JM12-6型锚具早已成功地应用于予应力钢筋混凝土结构中,并且有了较为成熟的经验.但把它们应用于予应力钢结构时,由于受力状况的不同,并无任何经验可循.为了掌握这种予应力钢结构的工作性能,验证这类结构的设计方法,以及为了今后能进一步推广这种结构,因而进行了1/12(1/2)的模型试验. 实验结果证明:整个结构包括予应力钢铰线和锚具的工作是可靠的,设计方法是正确的,结构的安全度达1.866,完全符合设计要求.
The prestressed steel structure adopts high-strength steel as the prestressing rod member, and exerts prestress on the structure, so the economic effect of saving steel (20-30%) can be achieved. This structure has been comparatively developed in China since the 1960s. Widely used in the coal conveyor trestle, it has been widely used and has achieved good results. However, all prestressed steel trestles have been constructed using secondary or tertiary steel reinforcements. The strength of these reinforcements is not Very high, so the economic effect achieved is not significant, but also limits the development of the prestressed steel structure in the direction of large spans. The Northwest Electric Power Design Institute designed a 60-meter-span prestressed steel trestle for the Dawukou power plant for the first time. A steel hinge line with a tensile strength of up to 16,000 kg/cm2 was used as a prestressing member and anchored with a hinged type JM12-6 anchor. Compared with the ordinary steel trestle, 31% of the average steel was obtained. Not only has created conditions for improving the economic effects of prestressed steel structures, but it has also opened up new avenues for the development of this structure in the direction of greater span. High-strength steel hinges and hinges JM12-6 type anchors have already been successfully applied. Stress Reinforced concrete structures have relatively mature experience. However, when they are applied to prestressed steel structures, there is no experience to follow because of different stress conditions. In order to grasp the working performance of such prestressed steel structures, To verify the design method of this type of structure and to further promote this structure in the future, a 1/12 (1/2) model test was conducted. The experimental results show that the entire structure includes the work of the prestressed steel hinge line and the anchorage device. It is reliable, the design method is correct, and the safety of the structure is 1.866, which fully meets the design requirements.