【作者】 黄晶；

【导师】 郑建岚；

【作者基本信息】 福州大学 ， 结构工程， 2004， 硕士

【摘要】 钢筋混凝土扁梁框架结构作为一种新型结构体系，可有效降低建筑物的层高和总高度，减小由于风荷载和地震力作用产生的结构内力，节省工程造价，尤其在建筑物总高度受限制的情况下更具有显著的技术与经济效益。但是由于扁梁的刚度小，往往需要在扁梁中配置预应力筋，以控制扁梁的挠度和裂缝宽度，同时也带来了位移反应较大、结构耗能较低、延性能力较差的弱点。近年来国内已经开始在实际工程中采用无粘结部分预应力混凝土扁梁框架结构，但是目前对这种结构形式的抗震研究工作还不完善，理论研究已滞后于工程应用的需要，因此深入进行扁梁框架结构的研究，在经济合理的情况下确保该结构的抗震安全性具有重要的理论意义和应用价值。本文总结了国内外对钢筋混凝土扁梁框架结构、预应力混凝土结构和钢纤维混凝土的研究，概括了钢纤维混凝土的性能及其对框架抗震性能的影响。在总结前人工作的基础上，主要进行了两榀单层单跨的扁梁框架结构的拟静力抗震性能试验研究，对强度等级相同、尺寸一样的钢纤维混凝土框架和普通混凝土框架进行低周反复加载试验，分析比较两榀框架在模拟地震作用下的破坏形态、承载力、延性和耗能能力，研究掺入钢纤维对预应力扁梁框架的抗震性能的影响，同时用ADINA非线性有限元分析软件进行计算机模拟,与试验结果进行比较并研究不同预应力度、钢纤维掺量对扁梁框架受力性能的影响。研究结果表明：将钢纤维掺入混凝土中用于框架结构，能使预应力扁梁框架具有足够好的抗震性能，只要设计得当，可以形成梁铰耗能机构及整体破坏机制，且具有较好的耗能及抵抗强震的能力。计算机仿真模拟结果和试验结果的比较发现，在框架的开裂破坏形态、极限承载力等方面基本吻合。该研究成果可为扁梁框架结构体系的设计和有关规范的增补提供依据，具有很好的应用前景。更多还原

【Abstract】 As a new kind of structure, the reinforce concrete flat-beam frame structure reduces the floor height and totle height of building efficiently, cuts down the internal force of structures caused by wind load and seismic effect, economizes the building costs. Especially, at the condition of the totle height of building being controlled, this structure is still provided with notable technology and economic benefit. But because the rigidity of the flat-beam is small, sometimes we need to use the prestressed steel to control the flexibility of the flat-beam and the width of the crack. At the same time, it brings the greater displacement reaction, lower energy-dissipation capacity and badly ductility ability etc. The unbonded partially prestressed concrete flat-beam frame structure has been used in the practice project in our country, but the aseismatic study of this structure is not perfect at present, study on theory is lagged behind the demand of engineering apply. It has important theoretic meaning and applied value to go deep into the examinational study about the prestressed concrete flat-beam frame structures.This thesis sums up the study of the RC flat-beam frame structure, the PC frame structure, the steel-fiber concrete, the performance of the steel-fiber concrete and its influence to the seismic resistance of the frame. Based on the previous research results, the test study on quasi-static seismic resistance behavior of the monolayer and single-stride prestressed concrete flat-beam frame structures are mostly carried through. The low-cyclic reversed loading test of two frames with the same size and the same intension grade are conducted. One frame is made of ordinary concrete, the other is made of steel-fiber concrete. The aseismatic behaviors of the two frames are analyzed and compared, with emphases on failure mechanism, hysteretic property, displacement ductility, energy-dissipation capacity as well as stiffness degeneration, etc, to find the influence of steel-fiber concrete to the aseismatic behaviors of the prestressed concrete flat-beam frame structures. At the same time, computer simulation of the structures<WP=4>with the non-linearity finity element software ADINA is carried out to compare with the result of the examination, study the influence of behaviors of the flat-frame because of the different prestressing ratio(PPR) and the dosage of steel-fiber.The results show, when steel-fiber concrete is used in the frame structure, the PC concrete flat-beam frames can have the more satisfiable aseismatic behaviors. When designed rationally, the frames can form beam hinge energy-dissipation machine and total destroy mechanism. The structural system have considerable energy-dissipation capacity and the strong seismic resistance behavior, so can be generalized and used in medium seismic zones. Through the compare of the resule of computer simulation and the examination, we can fine that the craze destroy form and the failure load etc. of the frame are inosculate basically. This fruit of the study can provides new methods to the supplement of concerned criterion and the design about the flat-beam frame structure更多还原