【作者】 任杰；

【导师】 郑山锁；

【作者基本信息】 西安建筑科技大学 ， 结构工程， 2009， 硕士

【摘要】 型钢高强高性能混凝土(SRHSHPC)组合结构作为一种新型的结构形式,充分发挥了钢与高强高性能混凝土两种材料的优良特性,逐渐成为了高层和超高层建筑的主要结构形式之一。本文对SRHSHPC框架节点进行了受力性能研究,主要研究内容如下:1、通过5榀SRHSHPC框架节点试件的低周反复加载试验,探讨了节点的受力性能,包括裂缝开展、受力机理、破坏形态,分析了轴压比、混凝土强度对节点承载力、骨架曲线、滞回曲线的影响。2、采用ANSYS有限元程序对节点试件的受力过程进行了数值模拟,得到了节点在单调荷载作用下的荷载—位移曲线。与试验结果对比分析表明,本文所采用的分析模型基本合理,可以客观地反映节点的受力性能。在此基础上,进一步探讨了含钢率变化对SRHSHPC框架梁柱节点受力性能的影响,分析了节点核心区型钢的应力分布以及节点范围纵筋和箍筋的受力状况。3、基于已有单、双参数损伤模型,引入破坏比及累积塑性损伤参数,得出适用于SRHSHPC框架梁柱节点的损伤模型,并通过试验结果回归确定了模型中损伤参数。最后,基于节点损伤指数的变化规律,研究混凝土强度、轴压比对节点损伤性能的影响。更多还原

【Abstract】 The steel reinforced high strength and high performance concrete(SRHSHPC) structure as a new type of structural form,can play fully excellent features of steel and high strength high performance concrete,so it gradually become one of the primary structures for the high-rise and supper high-rise buildings.In this paper,the mechanical behavior of SRHSHPC frame joints is studied,and the main research contents are as follows:Based on the test results of 5 SRHSHPC frame joints under low cyclic loading,the mechanical behaviors of frame joints is discussed,including crack development,the stress mechanism and the failure modes.The effect of the axial compression ratio,concrete strength on the carrying capacity,the skeleton curve,as well as the hysteresis curve of joints is respectively analyzed.ANSYS finite element program is used to perform the numerical simulation of loading process of the joint,and the load-displacement curve under monotonic axial load is obtained.Comparison of numerical analysis results with the experimental results indicates that the model is basically reasonable and can impersonally reflect the mechanical behavior of the joint.On the basis of the mentioned above,the effect of steel ratio on the mechanical performance of SRHSHPC frame joints is further discussed.The stress distribution of steel as well as the stress situation of longitudinal steel and hoop steel in the point area are analyzed.Based on the single,two-parameter damage model,the failure ratio and the cumulative plastic damage parameters are introduced,and the damage model for SRHSHPC frame joints is obtained,furthermore the damage parameters are ascertained by the regression of the experimental results.Finally,according to the change law of damage index,the effect of concrete strength and axial compression ratio on the damage performance of joint is studied.更多还原