【摘要】：增大截面加固法是加固鋼筋混凝土結(jié)構(gòu)常用而有效的方法,大量運用于剪力墻結(jié)構(gòu)加固工程中,通常有單面增大截面和雙面增大截面兩種方式。由于兩種加固方法的傳力途徑、受力特點不同,加固剪力墻的抗震性能會受到相應(yīng)的影響,但是兩者在破壞形態(tài)、滯回特性、承載力、延性、剛度及耗能能力等方面存在的具體差異尚不清楚。因此研究單、雙面增大截面法加固剪力墻的抗震性能,探究兩者的加固效果,將完善我國剪力墻抗震加固領(lǐng)域的研究內(nèi)容。本文根據(jù)現(xiàn)有的相關(guān)研究成果與規(guī)范,設(shè)計制作了未加固剪力墻、單面增大截面加固剪力墻與雙面增大截面加固剪力墻3片一字型剪力墻試件,各試件的軸壓比、剪跨比、配筋率均相同,通過擬靜力試驗對三者的抗震性能進(jìn)行了研究,對比分析了單、雙面增大截面加固剪力墻試件的加固效果。試驗結(jié)果表明:(1)增大截面法加固一字型剪力墻試件的滯回特性、承載能力、延性、剛度及耗能能力與未加固一字型剪力墻試件相比均有一定幅度的提升,抗震性能得到明顯改善,加固效果良好,單、雙面增大截面加固法均能有效運用在剪力墻抗震加固工程中;(2)雙面與單面增大截面加固一字型剪力墻試件的抗震性能存在一定的區(qū)別,具體比值如下:初始剛度基本相等,極限承載力比值為1.26,破壞荷載比值為1.21,峰值點位移比為1.04,極限位移比值為1.01,位移延性系數(shù)比值為1.05,等效粘滯阻尼系數(shù)比值為1.09,可見雙面增大截面加固法對一字型剪力墻的抗震加固效果優(yōu)于單面增大截面加固法。在試驗研究的基礎(chǔ)上,采用有限元分析軟件ABAQUS對建立的3片剪力墻模型進(jìn)行了低周反復(fù)加載全過程的數(shù)值模擬,得到了墻體的破壞形態(tài)、應(yīng)力分布、滯回曲線與極限承載力,將所得結(jié)果與試驗結(jié)果進(jìn)行對比分析,驗證了單、雙面增大截面加固法的加固效果和有限元模擬的可靠性。在此基礎(chǔ)上,對加固截面厚度不同的3片單面增大截面加固一字型剪力墻試件進(jìn)行有限元拓展分析,研究了不同的加固截面厚度對單面增大截面加固一字型剪力墻抗震性能的影響規(guī)律。研究結(jié)果表明:(1)模擬結(jié)果的破壞形態(tài)特征與試驗相符,極限承載力誤差均在10%以內(nèi),有限元分析結(jié)果與試驗結(jié)果基本吻合,驗證了本文所建立的有限元模型與分析過程是合理可靠的,具有較高的準(zhǔn)確性。(2)隨著加固截面厚度的增大,單面增大截面加固一字型剪力墻試件的承載能力與延性整體上呈現(xiàn)不斷上升的發(fā)展趨勢,增長幅度逐漸降低。且加固截面厚度為85mm的單面增大截面加固一字型剪力墻試件的抗震加固效果與加固截面厚度為70mm的雙面加固試件基本接近。綜上所述,增大截面加固法能夠顯著提高一字型剪力墻的抗震性能,是適用于剪力墻抗震加固的有效方法,而雙面增大截面加固法的抗震加固效果優(yōu)于單面增大截面加固法,可以通過增大加固截面厚度的方式使單面增大截面加固一字型剪力墻的抗震性能達(dá)到同樣的效果。本文對于增大截面法加固一字型剪力墻抗震性能的初步研究,將為實際剪力墻結(jié)構(gòu)的合理加固提供參考,并為進(jìn)一步探究增大截面法加固剪力墻的抗震性能,優(yōu)化剪力墻增大截面的加固方式奠定理論基礎(chǔ),具有重要的研究價值。
[Abstract]:Increased cross-section reinforcement is a common and effective method to reinforce reinforced concrete structures. It is widely used in shear wall structures. There are usually two ways to increase the cross-section on one side and double sides. However, the specific differences between the two methods in failure mode, hysteretic behavior, bearing capacity, ductility, stiffness and energy dissipation capacity are still unclear. Therefore, the study on the seismic performance of shear walls strengthened by single-side and double-side enlarged cross-section method, and the study on the reinforcement effect of the two methods will improve the research content in the field of seismic strengthening of shear walls in China. Relevant research results and codes have been designed and manufactured. Three one-piece shear wall specimens are designed and manufactured. The axial compression ratio, shear span ratio and reinforcement ratio of each specimen are the same. The results show that: (1) The hysteretic behavior, bearing capacity, ductility, stiffness and energy dissipation capacity of the shear wall strengthened by enlarging section method are improved to a certain extent compared with those of the shear wall strengthened by non-strengthening section method. Double-sided enlarged cross-section reinforcement method can be effectively used in shear wall seismic reinforcement engineering; (2) There are some differences between double-sided and single-sided enlarged cross-section reinforcement of a zigzag shear wall specimen seismic performance, the specific ratio is as follows: the initial stiffness is basically equal, the ultimate bearing capacity ratio is 1.26, the failure load ratio is 1.21, the peak displacement ratio is 1.0. 4. The ultimate displacement ratio is 1.01, the displacement ductility ratio is 1.05, and the equivalent viscous damping ratio is 1.09. It can be seen that the seismic strengthening effect of double-sided enlarged section reinforcement method is better than that of single-sided enlarged section reinforcement method. The failure modes, stress distributions, hysteretic curves and ultimate bearing capacity of the wall are obtained by numerical simulation of the whole process of cyclic loading. The results are compared with the experimental results, which verify the reinforcement effect and the reliability of finite element simulation of the single-side and double-side enlarged section reinforcement method. Three specimens of one-way shear wall strengthened with one-way enlarged cross-section are analyzed by finite element method, and the influence of different thickness of strengthened cross-section on the seismic performance of one-way enlarged cross-section shear wall is studied. The results of finite element analysis are in good agreement with the test results, which proves that the finite element model and analysis process established in this paper are reasonable and reliable, and have high accuracy. (2) With the increase of the thickness of the reinforced section, the bearing capacity and ductility of the strengthened shear wall specimens with one-sided section increase gradually. In conclusion, the method of enlarging the cross-section can significantly improve the seismic performance of the I-shaped shear wall and is suitable for shear. The seismic strengthening effect of double-side enlarged section reinforcement method is better than that of single-side enlarged section reinforcement method. The seismic performance of single-side enlarged section reinforced I-shaped shear wall can achieve the same effect by increasing the thickness of reinforcement section. The preliminary study on seismic performance will provide reference for the reasonable reinforcement of shear wall structure, and lay a theoretical foundation for further study on the seismic performance of shear wall strengthened by enlarged section method, and optimize the reinforcement method of shear wall enlarged section, which has important research value.
【學(xué)位授予單位】：西南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU398.2;TU352.11

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本文編號：2247013