【摘要】：高強(qiáng)鋼筋的使用對于節(jié)約鋼材,促進(jìn)可持續(xù)發(fā)展有積極的意義,但是高強(qiáng)鋼筋的應(yīng)用也意味著正常使用狀態(tài)下鋼筋應(yīng)力和應(yīng)變的增加,構(gòu)件裂縫寬度將增大,有可能由承載能力控制配筋設(shè)計變?yōu)橛墒褂眯阅芤罂刂?這將限制鋼筋強(qiáng)度的發(fā)揮,浪費(fèi)鋼材的良好性能。本文對HTRB600鋼筋作為主要受力鋼筋的高強(qiáng)混凝土受彎性能進(jìn)行了研究,包括承載能力、裂縫、剛度等,為HTRB600鋼筋在實(shí)際工程中的應(yīng)用提供依據(jù)。本文通過對5根配HRB400鋼筋和5根配HTRB600鋼筋的高強(qiáng)混凝土受彎構(gòu)件進(jìn)行試驗(yàn),詳細(xì)觀測記錄了試驗(yàn)過程中裂縫的出現(xiàn)與開展、撓曲變形、破壞特征和極限承載力情況,進(jìn)行對比分析。試驗(yàn)表明,HTRB600鋼筋的強(qiáng)度設(shè)計值可取為500MPa,根據(jù)現(xiàn)行規(guī)范《混凝土結(jié)構(gòu)設(shè)計規(guī)范》(GB50010-2010)的公式計算其極限承載能力,有足夠的安全儲備。試驗(yàn)中獲得了大量的裂縫觀測數(shù)據(jù),結(jié)合以往關(guān)于400MPa級和500MPa級鋼筋混凝土受彎構(gòu)件的試驗(yàn)數(shù)據(jù)在規(guī)范的計算模式基礎(chǔ)上,對計算公式進(jìn)行分析,結(jié)果表明,對于鋼筋應(yīng)力較低的情況,規(guī)范推薦的短期最大寬度裂縫計算值與實(shí)測值比較吻合,但是在鋼筋應(yīng)力較高的情況下,規(guī)范公式對裂縫寬度的計算明顯過于保守,因此建議在裂縫寬度計算中對鋼筋正常使用情況下的應(yīng)力設(shè)置限值。同樣,根據(jù)試驗(yàn)中獲得數(shù)據(jù)并結(jié)合以往的大量數(shù)據(jù)對規(guī)范短期剛度公式進(jìn)行了分析,發(fā)現(xiàn)規(guī)范的剛度公式偏不安全,對其進(jìn)行了修正。通過有限元軟件ABAQUS進(jìn)行數(shù)值分析,考察了鋼筋強(qiáng)度等級對普通鋼筋混凝土受彎構(gòu)件截面延性的影響,以三個不同的指標(biāo)進(jìn)行對比。同時,考慮對強(qiáng)度較高的高延性鋼筋如HTRB600鋼筋施加一定的預(yù)應(yīng)力,研究了有效預(yù)應(yīng)力對構(gòu)件受彎截面延性的影響。從能量的角度出發(fā),分析鋼筋強(qiáng)度等級對于構(gòu)件耗能能力的影響,結(jié)合鋼筋進(jìn)入塑性階段后的加載卸載準(zhǔn)則,考察預(yù)應(yīng)力對構(gòu)件耗能性能的影響。從減小預(yù)制混凝土實(shí)心方樁運(yùn)輸和使用過程中開裂現(xiàn)象的需求出發(fā),在混凝土預(yù)制方樁中使用HTRB600鋼筋,對其施加一定的預(yù)應(yīng)力。對兩根預(yù)應(yīng)力混凝土方樁進(jìn)行了抗彎性能的試驗(yàn),結(jié)果表明,預(yù)應(yīng)力有效改善了其開裂性能,上述方法解決預(yù)制方樁易出現(xiàn)裂縫的問題效果明顯。模擬設(shè)計了不同配筋情況的5個混凝土預(yù)制方樁,分析預(yù)應(yīng)力張拉后的預(yù)應(yīng)力損失,結(jié)果表明鋼筋的預(yù)拉應(yīng)力不宜過小,利用Fortran 90編制了計算機(jī)程序,以一些合理的基本假設(shè)為基礎(chǔ),考慮材料的非線性本構(gòu)關(guān)系,用數(shù)值迭代的方法求解5根構(gòu)件的開裂彎矩。利用Opensees對混凝土方樁進(jìn)行耗能分析,研究鋼筋強(qiáng)度等級對構(gòu)件耗能能力的影響,結(jié)果表明高強(qiáng)鋼筋的使用對樁的耗能性能的影響并不明顯。
[Abstract]:The use of high strength steel bar is of positive significance for saving steel and promoting sustainable development, but the application of high strength steel bar also means that with the increase of stress and strain of steel bar in normal use, the crack width of component will increase, which may change from the design of bearing capacity control reinforcement to the control of performance requirements, which will limit the strength of steel bar and waste the good performance of steel. In this paper, the bending behavior of high strength concrete with HTRB600 steel bar as the main stress steel bar is studied, including bearing capacity, crack, stiffness and so on, which provides the basis for the application of HTRB600 steel bar in practical engineering. In this paper, five high strength concrete members with HRB400 steel bar and 5 high strength concrete members with HTRB600 steel bar are tested, and the occurrence and development of cracks, deflection, failure characteristics and ultimate bearing capacity during the test are observed and recorded in detail, and the comparative analysis is carried out. The test results show that the strength design value of HTRB600 steel bar is 500 MPA, and the ultimate bearing capacity is calculated according to the formula of the current code "Code for Design of concrete structures" (GB50010-2010), and there is enough safety reserve. A large number of crack observation data are obtained in the test. Combined with the previous test data of 400MPa grade and 500MPa grade reinforced concrete bending members, on the basis of the calculation model of the code, the calculation formula is analyzed. The results show that for the case of low steel bar stress, the calculated value of short-term maximum width crack recommended by the code is in good agreement with the measured value, but when the steel bar stress is high, The calculation of crack width by the code formula is obviously too conservative, so it is suggested that the stress limit value should be set in the calculation of crack width under the condition of normal use of steel bar. Similarly, according to the experimental data and combined with a large number of previous data, the short-term stiffness formula of the code is analyzed, and it is found that the stiffness formula of the code is not safe, and it is modified. Through the numerical analysis of finite element software ABAQUS, the influence of reinforcement strength grade on the section toughness of ordinary reinforced concrete members subjected to bending is investigated, and three different indexes are compared. At the same time, considering the application of certain prestress to the high ductile steel bar such as HTRB600 steel bar, the influence of effective prestress on the toughness of the bending section of the member is studied. From the point of view of energy, the influence of steel bar strength grade on the energy consumption capacity of members is analyzed, and the influence of prestress on the energy consumption performance of members is investigated in combination with the loading and unloading criterion of steel bar entering the plastic stage. In order to reduce the demand of cracking in the transportation and use of precast concrete solid square pile, HTRB600 steel bar is used in concrete precast square pile to apply certain prestress to it. The bending behavior of two prestressed concrete square piles is tested. The results show that prestress can effectively improve their cracking performance, and the above methods are effective in solving the problem that prefabricated square piles are prone to cracks. Five concrete precast square piles with different reinforcement conditions are simulated and designed, and the prestress loss after prestress tension is analyzed. the results show that the pretension stress of steel bar should not be too small. A computer program is compiled by using Fortran 90. Based on some reasonable basic assumptions, considering the nonlinear constitutive relation of materials, the cracking bending moment of five members is solved by numerical iteration method. The energy consumption of concrete square pile is analyzed by Opensees, and the influence of steel bar strength grade on the energy consumption capacity of members is studied. the results show that the effect of high strength steel bar on the energy consumption performance of pile is not obvious.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU375

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本文編號：2503293