【摘要】：鋼筋混凝土梁的抗剪承載力研究是混凝土結構基本理論中的一個重要問題,各國學者對此問題做了廣泛而深入的探索和試驗研究。但是由于抗剪問題的影響因素眾多且相互作用復雜,至今學術界尚未對剪切破壞機理得出一個統(tǒng)一的理論和計算模型。隨著試驗和理論的發(fā)展,提出的計算模型趨于合理,但包括我國規(guī)范在內(nèi)的大部分國家的混凝土結構設計規(guī)范給出的受剪承載力計算公式仍是基于試驗結果統(tǒng)計分析的具有一定保證率的半理論半經(jīng)驗公式。雖然我國現(xiàn)行規(guī)范公式的計算可靠度有了一定程度的提高,但箍筋用鋼量比之前使用的規(guī)范計算值可能增加約25%。因此,我國規(guī)范需要一個更加合理有效的既可以保證承載力又能夠合理配筋的新理論。壓力路徑理論認為,處于極限狀態(tài)的鋼筋混凝土梁對抗剪的主要受力區(qū)域位于壓力路徑上,這也導致該截面成為梁的危險截面,在這些位置加強箍筋配置可以提高梁的抗剪承載力。本文依據(jù)壓力路徑理論,設計了6組不同剪跨比的鋼筋混凝土梁,每組2個試件,對比壓力路徑法配筋和我國現(xiàn)行規(guī)范方法配筋的效果。通過試驗,分析極限荷載、試驗梁的破壞過程和破壞模式、荷載-撓度曲線、荷載-應變曲線等力學性能。通過對壓力路徑法配筋梁的受剪機理的分析,驗證壓力路徑法在實際應用中的有效性、安全性,研究不同剪跨比對壓力路徑配筋方法的影響,并與傳統(tǒng)規(guī)范配筋梁的抗剪性能進行對比。試驗結果表明:試件沿壓力路徑傳遞的應力是影響抗剪強度的主要因素,按照壓力路徑法配筋不但可以提高梁的抗剪強度,而且其配箍率也要低于我國傳統(tǒng)方法。綜合分析我國現(xiàn)行規(guī)范配筋方法的優(yōu)缺點、實際應用中存在的不足和壓力路徑理論的適用性,提出安全性高、配筋合理的鋼筋混凝土梁配筋計算方法及其受剪破壞機理,為我國鋼筋混凝土梁的配筋計算方法研究和相關規(guī)范編制提供參考。
[Abstract]:The research of shear bearing capacity of reinforced concrete beams is an important problem in the basic theory of concrete structures. Scholars from all over the world have made extensive and in-depth exploration and experimental research on this problem. However, due to the large number of factors affecting shear failure and the complexity of interaction, the academic community has not yet come up with a unified theoretical and computational model for the shear failure mechanism. With the development of experiment and theory, the proposed calculation model tends to be reasonable. However, the calculation formula of shear capacity given by the code of concrete structure design in most countries, including the code of our country, is still a semi-theoretical and semi-empirical formula with certain guarantee rate based on the statistical analysis of test results. Although the calculation reliability of the current code formula in China has been improved to a certain extent, the amount of steel used for stirrups may increase by about 25% compared with the calculated value of the code used before. Therefore, China's code needs a more reasonable and effective new theory, which can guarantee both bearing capacity and reinforcement. According to the theory of pressure path, the main force area of reinforced concrete beam in ultimate state is located on the pressure path, which leads to the section becoming the dangerous section of the beam. Strengthening stirrups in these positions can improve the shear capacity of beams. Based on the theory of pressure path, six groups of reinforced concrete beams with different shear span ratios are designed. The ultimate load, failure process and failure mode, load-deflection curve, load-strain curve and so on are analyzed. Through the analysis of shear mechanism of reinforced beam with pressure path method, the effectiveness and safety of pressure path method in practical application are verified, and the influence of different shear span ratio on the reinforcement method of pressure path is studied. The shear behavior of reinforced beams is compared with that of traditional reinforced beams. The test results show that the stress transmitted by the specimen along the pressure path is the main factor affecting the shear strength. The reinforcement with the pressure path method can not only improve the shear strength of the beam, but also its hoop ratio is lower than that of the traditional method in China. Based on the comprehensive analysis of the advantages and disadvantages of the current code reinforcement methods in China, the shortcomings in practical application and the applicability of the pressure path theory, this paper puts forward the calculation method and shear failure mechanism of reinforced concrete beams with high safety and reasonable reinforcement. It provides a reference for the research of reinforcement calculation method and the compilation of relevant codes of reinforced concrete beams in China.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU375.1

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