本文選題：活性粉末混凝土 + T形疊合梁　； 參考：《天津大學學報(自然科學與工程技術版)》2017年03期

【摘要】：通過12片T形活性粉末混凝土(RPC)-普通混凝土(NC)疊合梁試件和1片NC整澆梁試件的靜載試驗,研究RPC受拉區(qū)高度、NC強度等級、受拉縱筋配筋率對組合梁抗彎靜載力學性能的影響.結(jié)果表明:隨RPC受拉區(qū)高度增加,疊合梁的受彎開裂形態(tài)從接合面處NC先裂轉(zhuǎn)變?yōu)榱旱識PC先裂,且開裂荷載增加,但最終受彎破壞形態(tài)與整澆梁一致;疊合梁抗彎承載力隨縱筋配筋率的提高而增大;提高NC強度等級對疊合梁抗彎承載力有一定提高作用.提出疊合梁開裂彎矩的計算方法,計算結(jié)果與試驗吻合良好.使用有限元軟件OpenSEES對RPC-NC疊合梁正截面抗彎破壞全過程進行分析,并基于擴展有限元理論(XFEM)對OpenSEES進行二次開發(fā),分析疊合梁受彎開裂裂紋擴展全過程,分析結(jié)果與試驗吻合良好,為進一步分析RPC-NC疊合梁開裂行為提供了理論應用基礎.
[Abstract]:Based on the static load tests of 12 T-shaped reactive powder concrete (RPC-normal concrete) composite beams and 1 NC cast-in-situ beam, the effects of the tensile zone height of RPC on the strength grade of NC and the ratio of tensile longitudinal reinforcement on the mechanical properties of composite beams under flexural loading were studied. The results show that with the increase of the height of RPC tensile zone, the flexural cracking morphology of the composite beam changes from the NC crack at the junction plane to the RPC crack at the bottom of the beam, and the cracking load increases, but the ultimate bending failure pattern is the same as that of the cast-in-place beam. The flexural bearing capacity of composite beams increases with the reinforcement ratio of longitudinal reinforcement, and the improvement of NC strength grade can improve the flexural capacity of composite beams to some extent. The calculation method of cracking moment of composite beam is put forward, and the calculated results are in good agreement with the test. The whole process of flexural failure of RPC-NC composite beams is analyzed by using the finite element software OpenSEES. Based on the extended finite element theory, OpenSEES is redeveloped to analyze the whole process of crack propagation of composite beams subjected to bending cracking. The results are in good agreement with the test results. It provides a theoretical basis for further analysis of the cracking behavior of RPC-NC composite beams.
【作者單位】： 北京交通大學土木工程學院;
【基金】：國家自然科學基金資助項目(51278040)~~
【分類號】：TU37

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本文編號：1996558