HRB500钢筋轻骨料混凝土受压构件力学性能研究

发布时间：2018-05-10 10:59

本文选题：HRB500钢筋 + 轻骨料混凝土　；参考：《苏州科技大学》2017年硕士论文

【摘要】：轻骨料混凝土结构自重轻、保温性能好、耐火抗震,但与国外相比,我国轻骨料混凝土结构中所配钢筋强度等级较低,会引起构件中配筋密集,施工难度加大,用钢量增多等问题,同时也会造成资源的浪费,与我国的“可持续发展战略”背道而驰。本文通过试验研究9根HRB500钢筋轻骨料混凝土轴心受压构件和1根HRB400钢筋轻骨料混凝土轴心受压构件,9根HRB500钢筋轻骨料混凝土偏心受压构件和1根HRB400钢筋轻骨料混凝土偏心受压构件,观察试件的破坏形态,并且根据试验数据分析试件承载力的影响因素,提出HRB500钢筋轻骨料混凝土轴心和偏心受压构件计算公式,以及偏压构件二阶效应计算的建议公式,并且通过ABAQUS来模拟构件的极限承载力和各个参数对其的影响规律。具体内容如下:1.对于轴心受压构件,其承载力随着轻骨料混凝土强度、配筋率、配箍率的提高而提高,随着构件长细比的提高而减小,但是配箍率对极限承载力的提高作用较小;轴心受压构件破坏时轻骨料混凝土的峰值压应变经过测量分析,仍然建议按原规范取值;根据现行规范计算的轴压构件承载力,试验值与计算值之比为1.05,可按原规范设计计算,结果偏于安全,也可按本试验给定公式计算。2.对于偏心受压构件,通过数据的对比分析,配有HRB500钢筋的轻骨料混凝土偏心受压构件受力性能与普通钢筋混凝土偏压构件一致,跨中轻骨料混凝土截面在每级荷载下同样能满足平截面假定。试验值与按照我国规范公式计算的承载力数值之比平均值为1.157,且具有一定的安全储备。3.通过近似挠度法和扩大偏心距法推导了HRB500钢筋轻骨料混凝土偏心受压构件二阶效应计算公式,通过公式分别计算偏压构件承载力与本次试验值所对比,研究表明:采用近似挠度法推导的二阶效应计算公式与普通混凝土一样,按照此法的计算值与试验值较为接近,且有一定的安全储备;采用扩大偏心距法推导的二阶效应在计算时,虽能够反映出与普通混凝土偏压柱之间的区别,但计算比较繁琐,且对于大偏心受压破坏,计算过于安全。4.基于试验的基础上,通过ABAQUS建立轴心受压构件和偏心受压构件模型,通过非线性分析计算,并且与试验结果相比较。研究表明:轴压构件模型和偏压构件模型的破坏形态与试验结果相类似;最终的模拟极限承载力与试验结果基本吻合,ABAQUS能较好的模拟HRB500钢筋轻骨料混凝土受压构件的受力特征且可以反应各个设计参数对受其极限承载力的影响规律。
[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.

【学位授予单位】：苏州科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU375

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