本文選題：HRB500鋼筋 + 輕骨料混凝土　； 參考：《蘇州科技大學(xué)》2017年碩士論文

【摘要】：輕骨料混凝土結(jié)構(gòu)自重輕、保溫性能好、耐火抗震,但與國外相比,我國輕骨料混凝土結(jié)構(gòu)中所配鋼筋強度等級較低,會引起構(gòu)件中配筋密集,施工難度加大,用鋼量增多等問題,同時也會造成資源的浪費,與我國的“可持續(xù)發(fā)展戰(zhàn)略”背道而馳。本文通過試驗研究9根HRB500鋼筋輕骨料混凝土軸心受壓構(gòu)件和1根HRB400鋼筋輕骨料混凝土軸心受壓構(gòu)件,9根HRB500鋼筋輕骨料混凝土偏心受壓構(gòu)件和1根HRB400鋼筋輕骨料混凝土偏心受壓構(gòu)件,觀察試件的破壞形態(tài),并且根據(jù)試驗數(shù)據(jù)分析試件承載力的影響因素,提出HRB500鋼筋輕骨料混凝土軸心和偏心受壓構(gòu)件計算公式,以及偏壓構(gòu)件二階效應(yīng)計算的建議公式,并且通過ABAQUS來模擬構(gòu)件的極限承載力和各個參數(shù)對其的影響規(guī)律。具體內(nèi)容如下:1.對于軸心受壓構(gòu)件,其承載力隨著輕骨料混凝土強度、配筋率、配箍率的提高而提高,隨著構(gòu)件長細比的提高而減小,但是配箍率對極限承載力的提高作用較小;軸心受壓構(gòu)件破壞時輕骨料混凝土的峰值壓應(yīng)變經(jīng)過測量分析,仍然建議按原規(guī)范取值;根據(jù)現(xiàn)行規(guī)范計算的軸壓構(gòu)件承載力,試驗值與計算值之比為1.05,可按原規(guī)范設(shè)計計算,結(jié)果偏于安全,也可按本試驗給定公式計算。2.對于偏心受壓構(gòu)件,通過數(shù)據(jù)的對比分析,配有HRB500鋼筋的輕骨料混凝土偏心受壓構(gòu)件受力性能與普通鋼筋混凝土偏壓構(gòu)件一致,跨中輕骨料混凝土截面在每級荷載下同樣能滿足平截面假定。試驗值與按照我國規(guī)范公式計算的承載力數(shù)值之比平均值為1.157,且具有一定的安全儲備。3.通過近似撓度法和擴大偏心距法推導(dǎo)了HRB500鋼筋輕骨料混凝土偏心受壓構(gòu)件二階效應(yīng)計算公式,通過公式分別計算偏壓構(gòu)件承載力與本次試驗值所對比,研究表明:采用近似撓度法推導(dǎo)的二階效應(yīng)計算公式與普通混凝土一樣,按照此法的計算值與試驗值較為接近,且有一定的安全儲備;采用擴大偏心距法推導(dǎo)的二階效應(yīng)在計算時,雖能夠反映出與普通混凝土偏壓柱之間的區(qū)別,但計算比較繁瑣,且對于大偏心受壓破壞,計算過于安全。4.基于試驗的基礎(chǔ)上,通過ABAQUS建立軸心受壓構(gòu)件和偏心受壓構(gòu)件模型,通過非線性分析計算,并且與試驗結(jié)果相比較。研究表明:軸壓構(gòu)件模型和偏壓構(gòu)件模型的破壞形態(tài)與試驗結(jié)果相類似;最終的模擬極限承載力與試驗結(jié)果基本吻合,ABAQUS能較好的模擬HRB500鋼筋輕骨料混凝土受壓構(gòu)件的受力特征且可以反應(yīng)各個設(shè)計參數(shù)對受其極限承載力的影響規(guī)律。
[Abstract]:Lightweight aggregate concrete structure has light weight, good insulation performance and fire resistance, but compared with foreign countries, the strength of reinforced concrete in the lightweight aggregate concrete structure is low, which will cause the intensive reinforcement of the components, the increase of construction difficulty, the increase of steel quantity, and the waste of resources, and the "sustainable development strategy" of our country. In this paper, 9 HRB500 reinforced lightweight aggregate concrete axle compression members and 1 HRB400 reinforced lightweight aggregate concrete axle compression members, 9 HRB500 reinforced lightweight aggregate concrete eccentric compression members and 1 HRB400 reinforced lightweight aggregate concrete eccentric compression members were studied in this paper, and the failure modes of the specimens were observed and the test number was determined according to the test number. According to the analysis of the influencing factors of the bearing capacity of the specimen, the formula for calculating the axial and eccentric compression members of HRB500 reinforced lightweight aggregate concrete and the formula for calculating the two order effect of the eccentric compression members are proposed. The ultimate bearing capacity of the components and the influence rules of each parameter are simulated by ABAQUS. The concrete contents are as follows: 1. for the axial compression structure The bearing capacity increases with the strength of the lightweight aggregate concrete, the ratio of reinforcement and the stirrup, and decreases with the increase of the ratio of the length and fineness of the components, but the ratio of the hoop to the ultimate bearing capacity is less. The peak pressure strain of the lightweight aggregate concrete is measured and analyzed when the axial compression member is destroyed. The ratio of the bearing capacity of the axial compression member calculated by the current standard is 1.05, which can be calculated according to the original specification. The result is partial to safety, and the formula of.2. for eccentric compression members can be calculated according to the given formula of this test. Through the comparison and analysis of data, the mechanical properties of the eccentric compression members with HRB500 steel reinforced lightweight aggregate concrete and ordinary steel can be obtained. The concrete cross section of reinforced concrete is consistent, and the cross section of medium light aggregate concrete can also satisfy the assumption of flat section under each load. The average value of the test value and the calculation of the bearing capacity of our country's standard formula is 1.157, and a certain safety reserve.3. is derived from the approximate deflection method and the extended eccentricity method to deduce the HRB500 reinforced lightweight aggregate. The formula for calculating the two order effect of concrete eccentric compression member is compared with that of this test. The study shows that the two order effect formula derived from the approximate deflection method is the same as that of the ordinary concrete, and the calculated value is close to the test value according to the method, and there is a certain safety reserve. The two order effect derived from the extended eccentricity method can reflect the difference between the eccentric compression column and the ordinary concrete, but the calculation is more complicated. On the basis of the large eccentricity compression failure, the calculation is too safe.4. based on the test, and the model of the axial compression member and the eccentric compression member is established by ABAQUS. The analysis shows that the failure mode of the axial compression member model and the partial pressure component model is similar to the test result, and the ultimate simulated ultimate bearing capacity is basically consistent with the test results, and ABAQUS can better simulate the stress characteristics of the HRB500 reinforced lightweight aggregate concrete compression member and can react to each design. The influence of the parameters on its ultimate bearing capacity.

【學(xué)位授予單位】：蘇州科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU375

【參考文獻】

相關(guān)期刊論文 前10條

1 龍莉;羅安智;;國內(nèi)外高強鋼筋發(fā)展和現(xiàn)狀分析[J];冶金管理;2012年11期

2 劉立新;杜朝華;;500MPa級鋼筋混凝土柱受壓性能試驗研究[J];公路交通科技(應(yīng)用技術(shù)版);2011年10期

3 劉曉紅;;輕骨料混凝土偏心受壓柱試驗與計算分析[J];四川建筑科學(xué)研究;2011年04期

4 付達新;;輕骨料混凝土的研究現(xiàn)狀與展望[J];中國建材科技;2009年06期

5 王信君;;高強鋼筋的研究及使用現(xiàn)狀[J];四川建筑;2009年03期

6 馬曉霞;;淺談輕骨料混凝土的應(yīng)用研究[J];今日科苑;2008年14期

7 向曉峰,郭志昆,劉峰,馬津渤;高強輕骨料混凝土的應(yīng)用與研究現(xiàn)狀[J];工業(yè)建筑;2005年S1期

8 邵永健,朱聘儒;輕骨料混凝土應(yīng)力-應(yīng)變曲線的研究[J];混凝土與水泥制品;2005年01期

9 王志軍,白紹良,高曉莉;對鋼筋混凝土偏壓桿件偏心距增大系數(shù)中截面曲率修正系數(shù)的討論[J];重慶建筑大學(xué)學(xué)報;1999年05期

10 受壓構(gòu)件專題研究組;;鋼筋輕骨料混凝土受壓構(gòu)件試驗研究[J];建筑結(jié)構(gòu);1983年02期

，

本文編號：1869033