【摘要】：HRB500鋼筋作為一種綜合性能優(yōu)良的高強熱軋帶肋鋼筋,其抗拉強度高,在混凝土結(jié)構(gòu)中推廣應(yīng)用HRB500級鋼筋可顯著減少鋼筋用量,取得良好的經(jīng)濟效益和社會效益。因此,在橋墩中采用高強鋼筋替換縱筋和箍筋,來改善橋墩在強地震作用下的抗震能力具有十分重要的理論和工程實際意義。對8根配置HRB500鋼筋的混凝土橋墩的抗震性能進行擬靜力試驗的研究和數(shù)值模擬,對其在低周往復(fù)荷載作用下的破壞特征、承載能力及位移延性、滯回曲線、骨架曲線、剛度退化、耗能能力進行分析,研究剪跨比、鋼筋強度、箍筋間距、軸壓比對橋墩抗震性能的影響規(guī)律。結(jié)果表明,高強鋼筋的配置可以明顯改善試件的滯回性能,使試件滯回曲線更加飽滿,使試件的承載能力和初始剛度顯著提高,但會降低試件耗能能力。在軸壓比較小的情況下,箍筋間距的減小使剪跨比較小試件的滯回曲線更加飽滿,試件位移延性得到改善,但會降低試件的耗能能力,對試件的極限承載能力影響不大。減小箍筋間距對剪跨比較大試件的極限承載能力、位移延性的提高作用有限,但會使試件的耗能能力減弱。在配箍率較大,核心混凝土得到充分約束的情況下,軸壓比的增大可以顯著提高試件的初始剛度和極限承載能力,但會使試件位移延性明顯減弱,對試件耗能能力的影響不顯著�；贏NSYS有限元軟件,對試驗各工況進行了數(shù)值模擬及非線性分析,并通過ANSYS有限元分析結(jié)果與實測結(jié)果進行對比發(fā)現(xiàn)兩者吻合程度較高,證明了試驗結(jié)論的正確性、可靠性和模型建立的合理性。為今后ANSYS對橋墩抗震性能的模擬提供參考。
[Abstract]:As a kind of high strength hot rolled ribbed steel bar with good comprehensive properties, HRB500 steel bar has high tensile strength. The application of HRB500 grade steel bar in concrete structure can significantly reduce the amount of steel bar, and obtain good economic and social benefits. Therefore, it is of great theoretical and engineering significance to replace longitudinal reinforcement and stirrups with high strength steel bar in pier to improve the seismic capacity of pier under strong earthquake. The quasi static test and numerical simulation of the seismic behavior of 8 concrete piers with HRB500 reinforcement were carried out. The failure characteristics, load-carrying capacity and displacement ductility, hysteretic curve, skeleton curve under low cycle reciprocating load were studied. The effects of shear span ratio, reinforcement strength, stirrups spacing and axial compression ratio on seismic behavior of piers are studied. The results show that the high strength steel bars can obviously improve the hysteretic properties of the specimens, make the hysteretic curves of the specimens more full, increase the load-bearing capacity and initial stiffness of the specimens, but reduce the energy dissipation capacity of the specimens. Under the condition of small axial compression, the hysteretic curve of shear span is more full and the displacement ductility of specimen is improved, but the energy dissipation capacity of specimen will be reduced with the decrease of stirrups spacing, which has little effect on the ultimate load-bearing capacity of the specimen. Reducing the space between stirrups has a limited effect on the ultimate bearing capacity of the specimens with large shear span and the improvement of the displacement ductility is limited, but it will weaken the energy dissipation capacity of the specimens. When the hoop ratio is large and the core concrete is fully restrained, the initial stiffness and ultimate bearing capacity of the specimen can be significantly increased by increasing the axial compression ratio, but the displacement ductility of the specimen will be weakened obviously. The effect on the energy consumption capacity of the specimen is not significant. Based on ANSYS finite element software, numerical simulation and nonlinear analysis are carried out on each condition of the test. By comparing the results of ANSYS finite element analysis with the measured results, it is found that the two conclusions are in good agreement with each other, which proves the correctness of the test results. Reliability and rationality of modeling. It provides a reference for the future ANSYS simulation of pier seismic performance.
【學(xué)位授予單位】：河北工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U442.55

【參考文獻】

相關(guān)期刊論文 前2條

1 賈金青,趙國藩;高強混凝土短柱的軸壓比限值[J];工業(yè)建筑;2002年06期

2 鞠彥忠,閻貴平,劉林;低配筋大比例尺圓端型橋墩抗震性能的試驗研究[J];土木工程學(xué)報;2003年11期

相關(guān)碩士學(xué)位論文 前1條

1 徐偉棟;配置高強鋼筋的混凝土柱抗震性能研究[D];同濟大學(xué);2007年

，

本文編號：2197544