本文關(guān)鍵詞：橋梁后錨固節(jié)點試驗研究及有限元分析　出處：《沈陽工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 預(yù)埋波紋管混凝土 內(nèi)聚力單元 凍融循環(huán) 鋼筋 粘結(jié)強度

【摘要】：隨著城市基礎(chǔ)建設(shè)的日新月異的飛速發(fā)展,為了縮短工期盡快緩解交通壓力將整體高架橋改為預(yù)制拼裝。根據(jù)要求,將其橋梁的部分下部結(jié)構(gòu)(蓋梁及墩柱)改用預(yù)制拼裝方案施工,而預(yù)制方案采用的是預(yù)埋波紋管的形式然后進行澆筑,在我國北方由于長期處于寒冷與溫暖交替狀態(tài),常常導(dǎo)致鋼筋銹蝕,混凝土強度下降,結(jié)構(gòu)發(fā)生耐久性損壞。研究鋼筋與混凝土在凍融循環(huán)作用下的粘結(jié)性能,對混凝土結(jié)構(gòu)研究中的耐久性在理論和應(yīng)用上具有至關(guān)重要的意義與價值。本文針對裝配式橋墩后錨固節(jié)點在凍融循環(huán)作用下的的耐久性能進行了相關(guān)的試驗與研究。主要有以下內(nèi)容:(1)適應(yīng)嚴(yán)寒地區(qū)凍融環(huán)境裝配式橋墩后錨固節(jié)點預(yù)留孔道內(nèi)壓漿材料-改性砂漿的試驗研究。通過該試驗選擇適合凍融環(huán)境的后錨固節(jié)點改性砂漿;(2)縮尺后錨固節(jié)點試件制作所需耐凍融環(huán)境的C40混凝土材料的性能試驗。通過該試驗確定裝配式節(jié)點混凝土的材料配比,防止后續(xù)的凍融拉拔試驗中出現(xiàn)混凝土試件首先破壞的情況;(3)后錨固節(jié)點不同凍融次數(shù)后拉拔試驗。本文主要采用C40混凝土200×200×350的橋墩裝配式節(jié)點縮尺試件,預(yù)埋波紋管作為鋼筋預(yù)留孔道,待試件養(yǎng)護28天后將鋼筋放入波紋管中灌入各種注漿材料,在不同凍融次數(shù)情況下對試件進行拉拔試驗,分析凍融循環(huán)對后錨固節(jié)點粘接強度的影響。(4)基于abaqus有限元模擬試驗分析。試驗結(jié)果表明,凍融循環(huán)次數(shù)對混凝土試件以及注漿試件的相對彈性模量和抗壓強度有相當(dāng)大的影響;對鋼筋、與預(yù)埋波紋管混凝土的粘結(jié)強度和滑移影響也比較明顯,且隨著凍融循環(huán)次數(shù)的增加,試件整體的粘結(jié)強度有明顯的下降趨勢;利用內(nèi)聚力單元和CZM本構(gòu)模型模擬預(yù)埋置波紋管混凝土總體上來講有一定可行性。
[Abstract]:With the rapid development of urban infrastructure, in order to shorten the construction period and relieve traffic pressure as soon as possible, the whole viaduct will be replaced by prefabricated assembly. The partial substructure of the bridge (capping beam and pier column) is replaced by the prefabricated assembly scheme, and the prefabricated scheme adopts the form of pre-buried bellows and then pouring. In the north of China, due to the cold and warm alternating state for a long time, it often leads to the corrosion of steel bar, the decline of concrete strength, and the durability damage of structure. The bond behavior of steel bar and concrete under the action of freeze-thaw cycle is studied. It is of great significance and value in theory and application to study the durability of concrete structure. In this paper, the durability of post-anchoring joints of prefabricated bridge piers under freeze-thaw cycle is tested and tested. The main contents of the study are as follows:. (. 1) the experimental study of modified mortar, which is suitable for freezing and thawing environment, is carried out to select the modified mortar which is suitable for freezing and thawing environment. (2) performance test of C40 concrete material which needs freeze-thaw environment for the manufacture of Anchorage joints after scaling. The material ratio of prefabricated joint concrete is determined by this test. To prevent the concrete specimen from first destroying in the subsequent freeze-thaw drawing test; In this paper, the preburied corrugated pipe is used as the reserved hole of steel bar, which is composed of C40 concrete 200 脳 200 脳 350 piers. After 28 days of maintenance, the steel bar was poured into the bellows with various grouting materials, and drawing tests were carried out under different freezing and thawing times. The influence of freeze-thaw cycle on the bonding strength of post-anchoring joints is analyzed. (4) based on abaqus finite element simulation test, the experimental results show that. The number of freeze-thaw cycles has a great influence on the relative elastic modulus and compressive strength of concrete specimens and grouting specimens. The bond strength and slip of steel bar and pre-buried bellows concrete are also obvious, and with the increase of freeze-thaw cycle times, the bond strength of the whole specimen has an obvious downward trend. It is feasible to simulate embedded bellows concrete by cohesive force element and CZM constitutive model.
【學(xué)位授予單位】：沈陽工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U446

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