【摘要】：橋面鋪裝層的耐久性是大跨徑鋼橋建設(shè)中的一項(xiàng)高難度的關(guān)鍵技術(shù)，防水粘結(jié)層是確保其結(jié)構(gòu)耐久性的重大措施之一，一些研究者甚至指出，防水粘結(jié)層的剪切破壞是造成橋面鋪裝損壞的根本原因。所以，全面系統(tǒng)地研究大跨徑鋼橋橋面鋪裝層粘結(jié)強(qiáng)度檢測技術(shù)，對大跨徑橋梁的設(shè)計(jì)和維護(hù)具有重要的意義。然而，現(xiàn)有粘結(jié)強(qiáng)度檢測方式主要為有損檢測，不允許用在實(shí)際鋼橋面板與鋪裝層間粘結(jié)強(qiáng)度檢測中，實(shí)際中，該粘結(jié)強(qiáng)度往往不得而知。因此，研究無損檢測技術(shù)在此處的適用性非常必要。 本文用超聲反射法從鋼板一側(cè)對該粘結(jié)強(qiáng)度進(jìn)行了試驗(yàn)研究，主要工作如下：（1）對四種波形在此處的適用性進(jìn)行了分析，選擇縱波進(jìn)行試驗(yàn)；（2）用超聲檢測常用頻率探頭0.5-10MHz對純鋼板進(jìn)行試驗(yàn)，根據(jù)試驗(yàn)回波峰值包絡(luò)曲線的衰減指數(shù)及包絡(luò)面積選擇5MHz大探頭作為檢測用探頭；（3）根據(jù)聲學(xué)邊界條件及工程經(jīng)驗(yàn)，對試驗(yàn)?zāi)Ｐ瓦M(jìn)行了簡化并制作了三種缺陷界面；（4）通過現(xiàn)有聲學(xué)參數(shù)、聲學(xué)知識及后續(xù)選探頭的試驗(yàn)研究，提出用回波峰值包絡(luò)曲線的衰減指數(shù)及包絡(luò)面積進(jìn)行各界面區(qū)分的方法；（5）利用室外試樣試驗(yàn)結(jié)果給出了鋼-氣、鋼-水、鋼-土三種缺陷界面衰減指數(shù)及包絡(luò)面積均值，初步分析該方法可用于甄別三種缺陷界面；（6）對室內(nèi)試樣初步判斷粘結(jié)良好區(qū)域，選擇了141個(gè)測點(diǎn)，初步給出了該試樣粘結(jié)良好界面的衰減指數(shù)范圍；（7）分析了人手力對試驗(yàn)結(jié)果的影響，，指出人手力非直接影響結(jié)果因素，并給出了后續(xù)試驗(yàn)應(yīng)注意事項(xiàng)；（8）給出了無損有損檢測測試布點(diǎn)圖，供后續(xù)試驗(yàn)進(jìn)行。
[Abstract]:The durability of deck pavement is a very difficult key technology in the construction of long span steel bridge. Waterproofing and bonding layer is one of the most important measures to ensure the durability of bridge deck pavement, and some researchers even point out that, The shear failure of waterproof adhesive layer is the root cause of bridge deck pavement damage. Therefore, it is of great significance for the design and maintenance of long span steel bridge to study comprehensively and systematically the detection technology of bond strength of deck pavement of long span steel bridge. However, the existing bond strength detection methods are mainly lossy detection, which is not allowed to be used in the actual steel bridge deck and pavement bond strength detection, in practice, the bond strength is often unknown. Therefore, it is necessary to study the applicability of NDT technology here. In this paper, the bond strength is tested from one side of the plate by ultrasonic reflection method. The main work is as follows: (1) the applicability of the four waveforms here is analyzed, and the longitudinal wave is selected to test; (2) the pure steel plate is tested with frequency probe 0.5-10MHz, and the large 5MHz probe is selected as the detector according to the attenuation index and envelope area of the peak envelope curve of the test echo, (3) according to the acoustic boundary condition and engineering experience, The test model is simplified and three defective interfaces are made. (4) through the existing acoustic parameters, acoustic knowledge and subsequent probe selection test, In this paper, the attenuation index and envelope area of echo peak envelope curve are used to distinguish each interface. (5) based on the test results of outdoor samples, the attenuation index and the mean value of envelope area of three kinds of defects, steel gas, steel water and steel soil, are given. The method can be used to identify three kinds of defect interfaces. (6) 141 measuring points are selected to determine the good bonding area of indoor samples, and the attenuation index range of the good bond interface of the samples is given preliminarily. (7) analyzing the influence of manual force on test results, pointing out that manual force does not directly affect the results, and giving the points needing attention in subsequent tests, and (8) giving the layout diagram of nondestructive testing for subsequent tests.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U443.33;U446

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