發(fā)布時(shí)間：2018-01-17 18:07

  本文關(guān)鍵詞：不同疲勞加載頻率下植筋混凝土梁疲勞性能的試驗(yàn)研究　出處：《河北工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 植筋梁 承載力 頻率 剛度

【摘要】：本文主要對3根試驗(yàn)梁進(jìn)行分析(共設(shè)計(jì)7根),植筋深度均為20d=500mm,試驗(yàn)材料均相同。首先對一根植筋梁進(jìn)行靜力試驗(yàn),得出試驗(yàn)梁跨中段在同時(shí)承受彎矩和剪力情況下的極限承載力,并將其與規(guī)范規(guī)定的計(jì)算公式相互對比,驗(yàn)算整澆梁公式是否適用于植筋梁。然后根據(jù)靜載試驗(yàn)的極限承載力對兩根同樣的植筋梁進(jìn)行疲勞試驗(yàn),分析不同階段時(shí)的各材料性能變化規(guī)律,對比其經(jīng)過不同頻率的疲勞循環(huán)荷載后的極限承載力、撓度和剛度的變化規(guī)律。本文的研究結(jié)論如下:1、通過靜載試驗(yàn)的極限承載力和整澆通筋梁的設(shè)計(jì)值對比。植筋深度為20d時(shí),植筋梁受彎承載力滿足要求。2、疲勞加載試驗(yàn)對植筋梁的極限承載力影響不大,但使其破壞機(jī)制由跨中正截面受彎破壞變?yōu)橹步疃祟^處斜截面彎剪破壞,因此,在進(jìn)行受彎植筋梁承載力計(jì)算時(shí),除考慮植筋抗拔承載情況外,尚應(yīng)對植筋端頭處混凝土彎剪破壞引起足夠重視。3、疲勞加載對植筋梁造成的疲勞累積損傷集中在前50萬次的疲勞加載過程。4、在一定頻率范圍內(nèi),低頻加載對植筋梁造成的累積損傷要大于頻率稍高時(shí)疲勞加載對植筋梁造成的疲勞累積損傷。
[Abstract]:In this paper, three test beams are analyzed (7 of them are designed, the depth of planting tendons is 20 days or 500mm, and the test materials are the same. First, a static test of one beam is carried out. The ultimate bearing capacity of the mid-span of the test beam under the condition of both bending moment and shear force is obtained, and the calculation formula is compared with the formula specified in the code. Check whether the formula of cast-in-place beam is suitable for planting steel beam. Then according to the ultimate bearing capacity of static load test carry on the fatigue test to two same beam-planting beam and analyze the change law of material performance at different stages. The variation of ultimate bearing capacity, deflection and stiffness after fatigue cyclic loading with different frequencies is compared. The conclusions of this paper are as follows: 1. The ultimate bearing capacity of static load test is compared with the design value of cast-in-place beam. When the depth of planting steel bar is 20 days, the flexural capacity of the beam meets the requirement of .2. Fatigue loading test has little effect on ultimate bearing capacity of reinforced beam, but the failure mechanism is changed from flexural failure of normal section of span to bending shear failure of oblique section at the end of reinforcement. In the calculation of flexural beam bearing capacity, in addition to taking into account the pull-out load, it is necessary to pay enough attention to the flexural shear failure of concrete at the end of the planting bar. The fatigue cumulative damage caused by fatigue loading is concentrated in the first 500,000 times of fatigue loading process. 4, in a certain frequency range. The cumulative damage caused by low frequency loading is greater than that by fatigue loading at higher frequency.
【學(xué)位授予單位】：河北工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU377.9

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