摘要
目前,随着一大批形式多样的复杂体型结构的不断涌现,钢筋混凝土(RC)框架异型中节点(下文称“异型梁-柱组合体”)得到大量应用。异型梁-柱组合体节点薄弱环节多、承载能力低和变形能力差。
本文共对8个1／3比例的变梁异型梁-柱组合件进行了梁式加载伪静力试验,用解析方法完成了异型梁-柱组合件变形能力计算方法的推导。主要结论如下：
①分析了轴压力、核心区配箍率、左右两侧梁截面尺寸变化、大小核心区面积比(A大／A小)、不同加载方式等对异型梁-柱组合体节点抗震性能的影响。
②合理、系统地建立了发生大核心剪切破坏的异型梁-柱组合体节点抗裂、通裂和极限承载力公式。
③研究比较了各种节点核心区有效抗剪高度(hbo)取值与实际情况的关系,最终确定了满足程度最好的hbo取值,较精确地确定了hbo取值的临界点区域。
④在本文解析分析及前人研究成果的基础上,提出了异型梁-柱组合件各种成分变形能力的计算方法,把组合件的变形能力和整个RC框架的变形能力建立起了联系。
⑤研究了各种因素对异型梁-柱组合件各种成分变形能力、刚度及抗震性能的影响,研究了组合件在三个受力阶段中各种变形成分引起的柱顶水平位移在柱顶总水平位移中所占的比例及规律性,并指出了框架结构在地震作用下层间位移验算时主要的变形成分。
⑥研究取得了异型梁-柱组合件的理论开裂、理论通裂及理论极限位移角。
综上所述,本文通过对RC框架变梁异型梁-柱组合体试件变形能力及抗震性能的试验和解析研究,可为有关行业的规范、规程的制订和修改提供试验和理论参考资料。
At present,with the proliferation of various kinds of complex structures,RC frame interior abnormal joints (here in after called abnormal beam-column subassemblages) has a wide rage of application abnormal beam-column subassemblages, with many drawbacks, lower bearing capacity and bad deformation capacity.
Based on beam load pseudo-static test of eight 1/3-scale abrupt beam abnormal beam-co-lumn subassemblages, the paper accomplish the numerical method deduce about this subassemblage's deformation capacity by analyzing. The main results are as following:
①The paper analyses such aspects as axial compressive force, the volumetric percentage of the stirrups in the joint core, the changes of beam sections for two sides, the size of the core area ratio,different loading methods, etc. Also, their affections on abnormal beam-column subassemblage's seismic behavior.
②The rational systerm sets up formula for first cracking, full cracking and ultimate in the subassemblage to bear the forces form big core shear failure.
③The paper conerns comparesion between different kinds of the joint core effective anti-shear high value and the practical situasituations. Finally, determines the hbo values with the highest satisfactory, and also, determines the hbo value more precisely and its critical point region in the core of the joint.
④Based on the research results of the pioneers the author made a lot of analyses and put forward numerical methods about deformation capacity of all sorts of elements in abnormal beam-column subassemblages.Moreover, the author made a connection between the deformation capacity of subassemblage and the whole RC frame subassemblage.
⑤The paper also analysized the affections of all factors to different constituents in abnormal beam-column subassemblages, such as deformation capacity, stiffness and seismic behavior. At the same time, during there stages, in subassemblage due to a variety of factors deformation, capitals level displacement occurs. The paper discussed the ratio and laws of this kind of displacement in the whole capital level displacement. Meanwhile, it point out the main deformational componets of frame structure under the seismic influence in the process of lower class interstory check.
⑥After a series of tests, the paper get the deformability of abnormal beam-column subassemblages in three stages:theorical first cracking, theorical full cracking and theorical ultimate.
In conclusion, according to the experimental and theorical analysis on deformation capacity and seismic behavior of RC frame structure abnormal beam-column subassemblages joints, in the hope of supplying experimental reference and theorical reference for the formulation and modification of rules or standards in other related fields.
引文
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