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在分析了工程广泛应用的预应力锚固结构传力特征基础上,基于粗糙面接触的法向应力与切向刚度存在正比增加的规律,视预应力锚固结构的预应力筋、锚具、非张拉锚固端相对锚垫板为一个广义质量系统;视锚具与锚垫板的切向联系为切向刚度的弹簧,建立了预应力锚固结构接触面广义质量单自由度模型,建造了与实际预应力锚固结构尺寸一致、锚固对象为混凝土的试验模型,获得了预应力锚固结构锚具相对锚垫板接触面切向振动信号。以建立的单自由度模型为依据,最小二乘法识别切向刚度,所识别的切向刚度与静载试验变化规律、量值基本一致,为有效检测锚固结构锚固力、仪器研发、标准制定提供了理论与试验依据。
Based on the analysis of the transmission force characteristics of prestressed anchorage structures widely used in engineering, there is a regular increase of normal stress and tangential stiffness based on rough surface contact. As prestressed tendons, anchors, The anchorage end is a generalized mass system relative to the anchor plate. The generalized mass one-degree-of-freedom model for the contact surface of the prestressed anchorage structure is established according to the tangential relation between the anchor and the anchor plate. The size of the prestressed anchoring structure is the same, and the anchoring object is the test model of the concrete. The tangential vibration signal of the anchor surface of the prestressed anchoring structure relative to the contact surface of the anchor plate is obtained. Based on the established model of single-degree-of-freedom, the least square method is used to identify the tangential stiffness, and the identified tangential stiffness and static load test are basically the same. For effective detection of the anchoring force of the anchoring structure, the R & D and standard setting are provided The theory and experimental basis.