本文選題：三級配大骨料混凝土 + 二級配濕篩混凝土　； 參考：《大連理工大學(xué)》2015年碩士論文

【摘要】：大壩、港口等水工混凝土結(jié)構(gòu),體積大,長期處于復(fù)雜的荷載作用下,采用大骨料混凝土。目前對于大骨料混凝土的試驗研究比較少,并且其中大部分的試驗為靜態(tài)多軸強度試驗,不能有效模擬實際的混凝土結(jié)構(gòu)的受力性能。因此,進行大骨料混凝土在地震條件下的雙軸拉壓試驗研究,對水工混凝土結(jié)構(gòu)的非線性分析、抗震設(shè)計有必要的理論和實用價值。同時進行濕篩二級配混凝土試驗,通過和大骨料混凝土試驗對比分析,得到兩者之間存在的差異,為以后實際應(yīng)用中采用濕篩混凝土試驗提供依據(jù)。本試驗為三級配大骨料混凝土動態(tài)雙軸拉壓力學(xué)性能試驗和濕篩二級配混凝土雙軸拉壓動態(tài)力學(xué)性能試驗,依托國家自然科學(xué)基金“大骨料混凝土多軸動態(tài)強度試驗和八面體空間動態(tài)破壞準(zhǔn)則研究”(編號：51079019),利用大型液壓伺服靜動三軸試驗系統(tǒng)而進行。應(yīng)變率為10-5/s～10-2/s,應(yīng)力比為-0.05,-0.1,-0.25,-0.5。具體內(nèi)容和結(jié)論如下：(1)進行了混凝土動態(tài)單軸拉伸試驗,獲得混凝土的動態(tài)拉伸強度和破壞形態(tài),得到了應(yīng)變率對混凝土強度的影響規(guī)律。(2)進行了三級配大骨料和濕篩二級配混凝土動態(tài)雙軸拉壓試驗,研究了不同應(yīng)變率、應(yīng)力比下的混凝土強度、破壞形態(tài)、應(yīng)力應(yīng)變關(guān)系。(3)建立了三級配大骨料、濕篩二級配混凝土在主應(yīng)力空間破壞準(zhǔn)則。
[Abstract]:Large aggregate concrete is used in hydraulic concrete structures such as dams and harbors, which are large in volume and under complex loads for a long time.At present, there are few experimental studies on large aggregate concrete, and most of the tests are static multiaxial strength tests, which can not effectively simulate the actual mechanical performance of concrete structures.Therefore, the experimental study of biaxial tension and compression of large aggregate concrete under earthquake conditions is necessary for the nonlinear analysis and seismic design of hydraulic concrete structures.At the same time, through the comparison and analysis between the wet sieve two-stage concrete distribution test and the large aggregate concrete test, the difference between them is obtained, which provides the basis for the practical application of the wet sieve concrete test in the future.This test is about the dynamic biaxial tensile and compression mechanical properties of three-stage concrete with large aggregate and the dynamic mechanical properties of two-stage wet sieve concrete under biaxial tension and compression.Based on the National Natural Science Foundation of China "large aggregate concrete multi-axial dynamic strength test and octahedron spatial dynamic failure criteria" (No.: 51079019), the large hydraulic servo static and dynamic triaxial test system was used.The strain rate is 10 ~ (-5) / s ~ (-2) / s, and the stress ratio is -0.05 ~ (-1) -0.1 ~ (-1) -0.25 ~ (-0.5).The concrete dynamic uniaxial tensile test was carried out, and the dynamic tensile strength and failure form of concrete were obtained.The effect of strain rate on concrete strength is obtained. (2) the dynamic biaxial tensile compression test of three-stage aggregate and wet sieve concrete is carried out, and the strength and failure form of concrete under different strain rate and stress ratio are studied.Stress-strain relation. 3) the failure criterion of three-stage aggregate and wet sieve secondary concrete in principal stress space is established.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU528

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本文編號：1751178