本文選題：鋼筋搭接連接 + 極限搭接長度　； 參考：《哈爾濱工業(yè)大學(xué)》2014年碩士論文

【摘要】：預(yù)制混凝土結(jié)構(gòu)關(guān)鍵在于解決預(yù)制構(gòu)件之間的鋼筋連接和混凝土界面連接，只有預(yù)制構(gòu)件之間的連接得到保證，結(jié)構(gòu)才能做到良好的整體性。哈爾濱工業(yè)大學(xué)課題組自主研發(fā)了約束漿錨鋼筋搭接連接，并將其應(yīng)用到預(yù)制混凝土剪力墻結(jié)構(gòu)的鋼筋連接中，形成了約束漿錨預(yù)制混凝土剪力墻結(jié)構(gòu)體系，這種體系在工程應(yīng)用中取得了良好的效果。從2008年起，哈爾濱工業(yè)大學(xué)課題組對約束漿錨鋼筋搭接連接方法做了大量試驗和理論研究，確定鋼筋的搭接長度為1.0倍的基本錨固長度。前期試驗表明增大螺旋箍筋配箍率可以減小鋼筋搭接長度，但未能確定最短搭接長度，鋼筋搭接長度越短，，越有利于工程使用以及預(yù)制構(gòu)件運輸和安裝，但搭接長度越短，搭接性能越不能得到保證，存在更大的安全隱患，在使用之前必須驗證其搭接性能。 本文在前期研究成果的基礎(chǔ)上，研究約束漿錨鋼筋搭接連接的極限搭接長度，極限搭接長度是指合理配箍構(gòu)造下的鋼筋最短搭接長度。本文設(shè)計了一系列試件進(jìn)行探索不同直徑鋼筋的極限搭接長度，以鋼筋直徑、螺旋箍筋配箍率、搭接長度為參數(shù)，共完成54個搭接連接試件。試驗加載方法參考《鋼筋機械連接通用技術(shù)規(guī)程》（JGJ107），并將試驗方法加以改進(jìn)。對直徑、、縱筋，改變搭接長度和配箍率，通過試件破壞現(xiàn)象和試驗數(shù)據(jù)確定三種直徑鋼筋的極限搭接長度，最終給出了三種直徑鋼筋的極限搭接長度。 將極限搭接長度研究試驗結(jié)果應(yīng)用到預(yù)制混凝土剪力墻結(jié)構(gòu)中，來驗證剪力墻鋼筋搭接連接的性能。本文設(shè)計了三片邊緣約束區(qū)縱筋直徑分別為、、 的足尺約束漿錨預(yù)制混凝土剪力墻試件，縱筋搭接長度根據(jù)極限搭接長度來確定，并按照現(xiàn)行規(guī)范來配筋。同時制作三片與預(yù)制剪力墻對應(yīng)的現(xiàn)澆混凝土剪力墻試件，鋼筋配筋、試件尺寸、加載工況均與對應(yīng)的預(yù)制剪力墻相同。通過對試件進(jìn)行擬靜力試驗，得出預(yù)制試件滯回曲線、骨架曲線、退化剛度、延性和耗能等指標(biāo)，并與現(xiàn)澆試件進(jìn)行對比。通過滯回曲線、骨架曲線發(fā)現(xiàn)，承載力方面，預(yù)制試件與現(xiàn)澆試件幾乎相同，而在延性以及耗能方面，預(yù)制試件要優(yōu)于現(xiàn)澆試件，表現(xiàn)出良好的抗震性能。試驗證明了鋼筋搭接性能良好，同時表明了鋼筋采用極限搭接長度是安全可行的。在極限搭接長度試驗和預(yù)制剪力墻擬靜力試驗的基礎(chǔ)上，并結(jié)合理論分析，給出了鋼筋極限搭接長度的設(shè)計建議使用公式。
[Abstract]:The key of precast concrete structure is to solve the connection of steel bar and concrete interface between prefabricated members. Only when the connection between prefabricated members is ensured can the structure achieve good integrity. The project team of Harbin University of Technology has independently developed the restrained mortar anchor steel bar lap connection, and applied it to the steel bar connection of the precast concrete shear wall structure, and formed the restrained slurry anchor precast concrete shear wall structure system. The system has achieved good results in engineering application. Since 2008, the research group of Harbin University of Technology has done a lot of experiments and theoretical studies on the method of lapping connection of restrained grouted anchor bars, and determined the basic anchoring length of steel bar with lapped length of 1.0 times. The preliminary tests show that increasing the ratio of screw stirrups can reduce the length of the lapped steel bar, but the shortest lapping length can not be determined. The shorter the lapping length of the steel bar is, the more favorable it is to the engineering use and the transportation and installation of the prefabricated members, but the shorter the lapping length is, the shorter the lapping length is. The more the lapping performance can not be guaranteed, the greater the safety risk exists, and the lapping performance must be verified before use. On the basis of the previous research results, this paper studies the limit lapping length of restrained grouted anchor bars, which refers to the shortest lapped length of steel bar under reasonable collocation structure. In this paper, a series of specimens are designed to explore the ultimate lap length of steel bars with different diameters. Taking the diameter of steel bar, the ratio of spiral stirrups and the length of lap joint as parameters, 54 lap joint specimens are completed. The test loading method refers to the General Technical Specification for reinforcement Mechanical connection and improves the test method. The ultimate lap length of three kinds of diameter steel bar is determined by the failure phenomenon of specimen and the test data. Finally, the ultimate lap length of three kinds of diameter steel bar is given. The experimental results of the ultimate lap length are applied to the precast concrete shear wall structure to verify the performance of the shear wall reinforced lap connection. In this paper, the diameter of the longitudinal stiffeners in the three edge restraint zones is designed respectively. The length of longitudinal reinforcement lapping is determined according to the limit length of concrete shear wall, and the reinforcement is made according to the current code. At the same time, three cast-in-place concrete shear wall specimens corresponding to prefabricated shear walls, reinforced bars, specimen sizes and loading conditions are all the same as the corresponding precast shear walls. The hysteretic curve, skeleton curve, degenerative stiffness, ductility and energy dissipation of prefabricated specimens were obtained by quasi-static test, and compared with cast-in-place specimens. From the hysteretic curve and skeleton curve, it is found that the prefabricated specimen is almost the same as the cast-in-place specimen in terms of bearing capacity, while the prefabricated specimen is superior to the cast-in-situ test piece in ductility and energy dissipation, showing good seismic performance. The test results show that the lapping performance of steel bar is good, and it is safe and feasible to use the ultimate lapping length of steel bar. On the basis of ultimate lap length test and pseudo-static test of precast shear wall and theoretical analysis, the formula for the design of ultimate lap length of steel bar is given.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU375

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本文編號：1888726