预应力对PC梁动静刚度影响的试验分析

发布时间：2018-04-02 05:13

本文选题：有效预应力　切入点：动刚度　出处：《东北林业大学》2014年硕士论文

【摘要】：预应力混凝土桥梁中的有效预应力是决定预应力混凝土桥梁能否安全运营的主要因素之一。在桥梁的使用阶段,由于荷载、疲劳、腐蚀、老化及环境因素等不利条件和因素的综合影响,桥梁中的有效预应力必将发生一定的损失。预应力的设计值和实际的有效预应力之间的差异将影响桥梁的服务能力,甚至会导致桥梁事故,因此,检测桥梁的有效预应力十分重要。本文通过对4片预应力筋布置形式和混凝土强度不同的试验梁模型进行室内试验研究。对试验梁在不同等级的预加力和竖向荷载条件下,进行自振频率、挠度和应变数据采集,进而发现动刚度(自振频率)、静刚度(挠度、钢筋、混凝土应变)等参数与有效预应力之间关系,确定预加力变化对预应力筋布置形式和混凝土强度等级不同的梁的影响效果。实测值与理论计算值和有限元数值进行对比分析,并从理论分析,在不同加载方式、约束条件、支撑间距、截面性质下,预加力对预应力混凝土梁挠度、频率的影响,以及对何种预应力筋布置形式的梁的挠度、频率影响最显著。本文对混凝土梁有效预应力的检测方法进行了积极的探索,对预应力混凝土桥梁结构静、动性能评定方法的研究起到一定的促进作用,为桥梁结构快速评定方法提供参考。
[Abstract]:The effective prestress in the prestressed concrete bridge is one of the main factors determining whether the prestressed concrete bridge can be safely operated . In the use stage of the bridge , the effective prestress in the bridge will be lost due to the comprehensive influence of load , fatigue , corrosion , aging and environmental factors . The difference between the design value of the prestress and the actual effective prestress will affect the service ability of the bridge and even lead to the bridge accident , so it is very important to detect the effective prestress of the bridge .

In this paper , the effect of pre - stress on the deflection and frequency of prestressed concrete beams and the effect of pre - stress on the deflection and frequency of prestressed concrete beams and the effect of pre - stressing on the deflection and frequency of prestressed concrete beams and the effect of pre - stressing on the deflection and frequency of prestressed concrete beams are studied .

In this paper , the method of detecting the effective prestress of concrete beam has been actively explored , and the research on the method of evaluating the static and dynamic performance of the prestressed concrete bridge plays a certain role , which provides a reference for the quick assessment method of the bridge structure .

【学位授予单位】：东北林业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.35;U441

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