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目的为了解决通廊稳定性不足等问题,找出巩固通廊的优化方案.方法对运输通廊结构进行现场检测,采用增大截面法制定三种加固方案,运用PKPM对通廊进行模拟计算,对比加固方案后通廊的内力、应力比和长细比的变化.结果通廊杆件锈蚀严重,承载力不足,部分杆件已变形.对比加固后的通廊进行分析:方案一对上下弦杆加固,加固后上弦杆内力减小31%,下弦杆内力减少25%;方案二对顶面桁架和底面桁架加固,加固后顶面桁架应力比减小23%,底面桁架应力比减少17%;方案三对上弦杆、顶面桁架和底面桁架进行加固,加固后上弦杆内力减小21.7%,顶面桁架应力比减小18.1%,底面桁架应力比减小13.9%.结论三个方案都能使结构更稳定,经对比分析可知,采用方案三可以使结构最平稳,承载力最高,故选方案三加固.
Objective To find out the optimization scheme for consolidating corridors in order to solve the problems such as lack of stability of corridors.Methods Field inspection of transport corridor structure was carried out and three reinforcement schemes were formulated by increasing cross section method and the corridor was simulated by using PKPM, The comparison of the internal force, the stress ratio and the slenderness ratio of the corridor after the reinforcement project was carried out.Results The corrosion of the corridor corridor was severe, the bearing capacity was not enough, some of the members had been deformed.Compared with the reinforced corridor, After the reinforcement, the internal force of the upper chord is reduced by 31% and the internal force of the lower chord is reduced by 25%. The second one is the reinforcement of the top truss and the bottom truss, the stress ratio of the top truss is reduced by 23% and the stress ratio of the bottom truss is reduced by 17% In the third scheme, the upper chord, the top truss and the bottom truss are reinforced, the internal force of the upper chord is reduced by 21.7% after reinforcement, the stress ratio of the top truss is reduced by 18.1% and the stress ratio of the bottom truss is reduced by 13.9% .Conclusion All three schemes Can make the structure more stable, the comparative analysis shows that the use of program three can make the most stable structure, the highest bearing capacity, so the election program three reinforcement.