配置加强箍筋混凝土短柱力学性能研究-结构工程专业论文.docx

配置加强箍筋混凝土短柱力学性能研究-结构工程专业论文.pdf摘 要
本文在 S-Clip 加强钢筋构造方法的研究基础上,对 S-Clip 构造配筋进行了理论分分析。根据实验结果,研究了构造钢筋对角隅混凝土的约束作用,克服了角部缺陷,在确保钢筋混凝土短柱承载能力的前提下,加强短柱或加强柱端部的配筋构造,以提高短柱和柱端部的变形能力,为高层建筑中底层短柱和普通钢筋混凝土柱端的加强方法提供参考,是一种有效提高抗震性能的配筋构造措施。
为确定这种新型配筋方式的有效性,按照混凝土等级、箍筋截面形式和纵筋配筋率的不同制作了 30 根钢筋混凝土短柱试件。通过对这 30 根试件的轴压加载试验,可直观的看到钢筋混凝土短柱的受力破坏过程,及裂缝的开展情况,通过整理采集到的数据, 可以得到短柱的荷载-位移全曲线和纵筋、箍筋的荷载-应变曲线,对比分析了配置井字复合箍筋,大 S-Clip 钢筋,及井字复合箍筋与小 S-Clip 钢筋配筋相结合的短柱的抗震性能。通过试验研究表明,新型配筋方式能更好约束了角部纵筋,为角部纵筋提供有效的支撑作用,同时使角隅混凝土处于三向受力状态,有效约束混凝土的横向变形,推迟了裂缝的开展,试件表现出良好的延性。
研究中采用 ANSYS 有限元分析软件,对其中的一组钢筋混凝土短柱进行模拟,通过静力非线性分析,可以得到极限承载力,并定量的观测到试件在不同受力阶段中纵筋、箍筋、混凝土的应力分布情况,得到了荷载-位移全过程曲线,通过与试验所得的荷载- 位移曲线作对比,二者吻合较好,验证了试验结果的可靠性,为全面地进行构造配筋的有效性研究和工程应用提供依据。
本文通过对试验数据的研究和理论分析,得出了新型约束配筋方式能有效的改善短柱的延性的结论。
关键词:S-Clip 筋;抗震性能;轴压加载试验;荷载-位移曲线;荷载-应变曲线; 延性;非线性分析
Abstract
Based on the study of S-Clip reinforcing steel construct ion met hod, theoret ica l analysis on S-Clip reinforcement is presented in this paper. The constraint of reinforcement on the corner concrete is studied and it es the corner defects. In the condition of guara nteeing capacity of reinforced concrete short columns, the deformability of short columns and ends of columns can be improved by reinforcement strengthening, and it provide s a reference for the strengthening met hods of short columns in ground floor s and ends mon reinforced concrete columns of high - rise build ings. It is an effective met hod of reinforcement construct ion measure to improve columns' anti-seismic performa nce.
According to the differences of concrete grade, cross-section of stirrup and tensile ratio of reinforcement, 30 reinforced concrete short column specimens were made to determine the effectivity of this new type of reinforcement. The process pression failure and crack propagation of short columns can be seen directly through axia pression test on 30 specimens. In addition, load-displacement curves of short columns and load-st rain curves of stirrups and longitudina l bars can also be obtained by analyzing data collected. Com