本文關(guān)鍵詞：輸電鐵塔應(yīng)力測試實驗研究　出處：《廣西大學》2015年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 輸電鐵塔 應(yīng)力測試 防水防潮 時效性 可重復性

【摘要】：輸電線路(塔)是電力工業(yè)系統(tǒng)的大動脈,研究其結(jié)構(gòu)內(nèi)力情況,保證其安全、可靠、穩(wěn)定運行是關(guān)系國計民生的重大問題。鑒于鐵塔實際結(jié)構(gòu)形狀、受載及變形等比較復雜,采用理想化、簡化結(jié)構(gòu)模型等方法進行分析校核比較困難,且得出的結(jié)果可能與工程實際不符合的情況。本文研究某送變電公司SJ331A-18雙回路塔和2B-GJ31-18單回路塔的應(yīng)力測試方法,評價SJ331A-18型塔在各種載荷工況下的應(yīng)力變化特征。本文的研究成果及結(jié)論如下：1.根據(jù)《架空線路桿塔結(jié)構(gòu)荷載試驗》DL/T899-2012要求,制定合理、安全的實驗加載步驟和方法；結(jié)合鐵塔實際運行情況確定了符合工程實際的4種模擬實驗工況：正常運行工況、模擬覆冰15mm工況、斷線工況和破壞工況；在此基礎(chǔ)上計算給出了各工況、各百分比所需的加載載荷。2.進行應(yīng)變片防水、防潮實驗。實驗結(jié)果表明,石蠟合劑防護層在戶外高溫日曬時會溶化流失,失去對應(yīng)變片的保護作用；而采用三防漆防護,在模擬野外長達30天高溫日曬、水潮浸襲等條件下,應(yīng)變片絕緣電阻500MΩ,即使將測點直接浸入水中,也不會發(fā)生零飄等問題,且三防漆的使用比石蠟合劑更方便。3.進行應(yīng)變片測量時效性和加載可重復性實驗。實驗結(jié)果表明,采用三防漆進行防護的應(yīng)變片,在模擬野外高溫日曬、水、潮浸襲等條件下,30天之內(nèi)得到的測量結(jié)果與理論計算值最大相差4.4%,重復加載時最大相差4.3%；能夠滿足戶外長時應(yīng)力測試要求。4.進行輸電鐵塔應(yīng)力測試。測試鐵塔塔高分別為36.6m、27.5m,兩塔跨度73.32m,塔身共布置96個應(yīng)變測點,掛有48條模擬荷載拉線；如此大規(guī)模同步、實時群測在廣西尚屬首例。實驗中,通過采用三防漆解決了應(yīng)變片長時防護問題；通過自制拉力計連接應(yīng)變儀解決了拉線荷載同步、實時監(jiān)控問題；通過采用分組群測,降低導線長度及合理布線等消除了工頻、靜電及地電干擾等問題。5.鐵塔測試結(jié)果表明,正常荷載工況下,雙回路塔最大應(yīng)力出現(xiàn)在第二層橫擔下方主材上,為滿載壓應(yīng)力179.1MPa,遠小于設(shè)計值31 OMPa；覆冰加載到75%時,此處應(yīng)力仍然最大,為壓應(yīng)力290.33MPa,超過了其計算穩(wěn)定許用值275.199MPa；表明鐵塔第二層橫擔下方的主材是整個結(jié)構(gòu)的薄弱環(huán)節(jié),在設(shè)計和運行維護中要重點關(guān)注。
[Abstract]:Transmission line (tower) is the main artery of the electric power industry system, study the structure internal force, ensure its safe, reliable and stable operation is of great significance. In view of the actual structure is beneficial to the people's livelihood tower shape, loading and deformation is more complex, the idealized and simplified structure model analysis and checking is difficult. The results may be related to engineering practice does not meet the situation. This paper studies the stress test method of a power transmission company SJ331A-18 Double Circuit Tower and 2B-GJ31-18 single circuit tower, SJ331A-18 tower in the evaluation of various loading conditions. The stress characteristics of research results and conclusions of this paper are as follows: 1. according to the requirements of the overhead line load test of >DL/T899-2012 tower structure reasonable, experimental steps and methods of loading safety; combined with the actual operation of the tower was determined 4 kinds of simulation experiments and practical conditions In normal operating conditions, the simulation of ice break condition and 15mm condition, the failure condition; on the basis of this calculation are given in different working conditions, the percentage of.2. load required for strain gauge waterproof, moisture-proof experiment. Experimental results show that the wax mixture protective layer in the outdoor temperature on the sun will melt loss, lose corresponding protective effect change sheet; and the use of three paint protection, in the simulation field up to 30 days of high temperature water tide sun, invasion and other conditions, the insulation resistance strain gauge 500M, even if the measuring point is directly immersed in water, does not occur zero drift and other issues, and the use of three paint than paraffin mixture more convenient.3. measurement time loading and repeatability of the experiment strain. The experimental results show that the strain gauge has a conformal coating for protection, in the simulation field high temperature sun, water, tide invasion and other conditions, the measurement results obtained within 30 days and the theoretical The maximum value is 4.4%, the maximum difference between the repeated loading 4.3%; can meet the test requirements of outdoor long time stress.4. transmission tower stress test tower tower are respectively 36.6m, 27.5m, the two tower span 73.32m, the tower is arranged 96 strain measuring point, hanging 48 simulation load pull; synchronization such a large-scale, real-time monitoring is the first case in Guangxi. In the experiment, by using the conformal coating to solve the protection problem when using the self-made film strain; strain gauge tension meter connection solves the load pull synchronization, real-time monitoring; by means of grouping group measurement, reduce the wire length and reasonable wiring to eliminate static electricity and electrical power, some problems in.5. tower test results show that the normal load conditions, double the maximum stress appears in the second layer below the main cross arm, for the full stress 179.1MPa, far less than the design value of 31 OMPa; icing Loading to 75%, the maximum stress is compressive stress, 290.33MPa, exceeds the allowable value of 275.199MPa stability calculation show that the second layer tower; the cross arm below the principal is the weak link of the whole structure, to focus on design and operation and maintenance.

【學位授予單位】：廣西大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM753

【參考文獻】

相關(guān)期刊論文 前2條

1 朱召泉;;鋼結(jié)構(gòu)構(gòu)件穩(wěn)定性問題淺析[J];鋼結(jié)構(gòu);2011年03期

2 魏巍;對梁柱分析中變形增量計算模型的評述[J];重慶建筑大學學報;1999年02期

相關(guān)博士學位論文 前1條

1 趙滇生;輸電塔架結(jié)構(gòu)的理論分析與受力性能研究[D];浙江大學;2003年

相關(guān)碩士學位論文 前1條

1 高超;鋼結(jié)構(gòu)穩(wěn)定性的數(shù)值分析研究[D];武漢理工大學;2011年

，

本文編號：1357428