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  本文關(guān)鍵詞： 張弦梁結(jié)構(gòu) 半波法 索力測試 有限元模型　出處：《遼寧工程技術(shù)大學》2015年碩士論文　論文類型：學位論文

【摘要】：張弦梁結(jié)構(gòu)是近十幾年發(fā)展起來的一種新型的結(jié)構(gòu)形式,因其具有良好的受力性能,拉索高強度的抗拉性能,優(yōu)美的造型及制作施工方便等優(yōu)點在目前的建筑結(jié)構(gòu)中得到了廣泛的應用。拉索作為張弦梁結(jié)構(gòu)的重要受力構(gòu)件,其在役期間的受力狀態(tài)關(guān)系到整個結(jié)構(gòu)的安全及正常的運行,索力測試精度和實用性也直接影響著大跨度張弦梁結(jié)構(gòu)健康監(jiān)測的應用,因此能夠準確的測出拉索在役期間的索力具有重要的現(xiàn)實意義。頻率法是目前索力測試的主要方法,對于多撐桿的張弦梁結(jié)構(gòu)而言,由于索段連接條件及環(huán)境因素會對測量的精度產(chǎn)生影響。針對多撐桿的張弦梁結(jié)構(gòu)索段約束復雜和索力識別精度等問題,本文采用一種新的索力識別方法—半波法對索力進行識別,半波法是基于頻率法的基礎(chǔ)上而應用的一種方法,半波法的關(guān)鍵就是對高階振型的識別,通過高階進行索力的計算。首先,通過對張弦梁模型的試驗研究,證明了半波法在張弦梁下弦拉索中進行索力測試的可行性。在兩撐桿的張弦梁縮尺模型的中間跨布置傳感器,通過人工激勵局部索的振動來測量高階振型半波長,利用簡支單索模型識別整體張弦梁的拉索的索力,對高階振型的測量可以得到更精確的拉索的索力。通過試驗研究結(jié)果表明,利用半波法對張弦梁拉索進行索力測試是可行的,當測出4階及以上振型時,可以得到更精確的索力。其次,根據(jù)黃河口模型試驗廳現(xiàn)場實際結(jié)構(gòu)建立有限元模型,通過施加應變的方式對拉索施加預應力,取其中一跨進行模態(tài)分析,通過高階振型的半波長及相應頻率計算索力。通過有限元分析可以看出,當取高階振型時,其索力越接近拉索的真實的索力。并且半波法計算索力的原理簡單,通過等效單索建立索力分析,也避免了復雜索的建模。
[Abstract]:The beam-string structure is a new type of structure developed in the past ten years. Because of its good mechanical properties and tensile properties of high tensile strength, The advantages of beautiful modeling and convenient construction have been widely used in the present building structure. As an important force member of the beam string structure, the stress state of the cable during service relates to the safety and normal operation of the whole structure. The accuracy and practicability of cable force test also directly affect the application of health monitoring of long-span beam string structure. Therefore, it is of great practical significance to accurately measure the cable force during the period of service. The frequency method is the main method of cable force testing at present. For the multi-braced beam string structure, the cable connection conditions and environmental factors will affect the accuracy of the measurement. In view of the complex constraints of the cable segment and the precision of cable force identification of the multi-braced beam structure, In this paper, a new method of cable force identification, the half wave method, is used to identify the cable force. The half wave method is based on the frequency method. The key of the half wave method is to recognize the high order modes. First of all, through the experimental research on the beam string model, it is proved that the semi-wave method is feasible to test the cable force in the string cable of Zhang Xian beam, and the sensor is arranged in the middle span of the scale model of the string beam with two strands. The vibration of local cables is artificially excited to measure the half-wavelength of high-order modes, and the simply supported single cable model is used to identify the cable force of the whole beam string. A more accurate cable force can be obtained from the measurement of high order modes. The experimental results show that it is feasible to test the cable force by using the half wave method, and when the fourth or more modes are measured, A more accurate cable force can be obtained. Secondly, according to the actual structure of the Huanghe Estuary Model Test Hall, the finite element model is established, and the prestressing force is applied to the cable by applying strain, and one of the spans is taken for modal analysis. Through finite element analysis, it can be seen that the cable force is closer to the real cable force when the higher-order mode is taken, and the principle of calculating cable force by half-wave method is simple. The cable force analysis is established by equivalent single cable, and the complex cable modeling is avoided.
【學位授予單位】：遼寧工程技術(shù)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU399

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本文編號：1546026