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Evaluation system of details of reinforcement arrangement and reinforcing method on seismic performance of RC columns

钢筋布置细节及加固方法对钢筋混凝土柱抗震性能评价体系

基本信息

批准号：
08555109
负责人：
MAEKAWA Koichi
金额：
$ 11.71万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

项目摘要

(1) Constitutive model for multi-cracked reinforced concreteConstitutive model for reinforced concrete with four independent fixed crack was developed. And its effectiveness has been verified by the experiment under reversed cyclic actions. As a result, the application of FEM analysis can be extended up to the complex loading conditions such as multi-directional forces or seismic actions coupled with dead load.(2) Details of reinforcement arrangement and zoning method for RC/PL zoneThe simple method to determine the zone with bond stress transfer mechanism (defined as RC zone) and the other zone (defined as PL zone) applicable for large scale RC columns or beams reinforced partially has been proposed based on the details of reinforcement arrangement. The shear capacity and the ductility of RC columns can be, regardless of reinforcement ratio and scale, predicted by applying constitutive model mentioned at (1) for RC zone and tension softening model for PL zone.Three dimensional analysis for RC columns and response of multi-directional forcesThe size effect on shear strength prior to yielding has been confirmed by numerical analysis of the short columns subjected to multi-directional forces for shear capacity and deformability and the RC beams with deferent scale subjected to flexural/shear forces. It is furthermore confirmed that the ductility of RC member without side rebars can be predicted appropriately by verification of shear failure after yielding.(4) Proposal of check system of seismic performance for RC framed structuresFor RC framed structures, the system for safety has been proposed by comparing two directional shear forces induced to the members computed by three dimensional nonlinear dynamic analysis with its capacity described at (3). And the validity of proposed system has been verified by applying to framed structures for railway damaged on the Great Hanshin Earthquake 1995.

(1)多裂纹钢筋混凝土本构模型建立了具有四条独立固定裂纹的钢筋混凝土本构模型。并通过反复荷载作用下的试验验证了该方法的有效性。因此，有限元分析的应用可以扩展到复杂的加载条件，如多向力或地震作用耦合恒载。(2)钢筋混凝土/预应力混凝土区域的配筋方式和分区方法根据配筋方式，提出了适用于大尺寸钢筋混凝土柱或梁的粘结应力传递区（定义为钢筋混凝土区域）和非粘结应力传递区（定义为预应力混凝土区域）的简单划分方法。钢筋混凝土柱的抗剪承载力和延性，无论配筋率和规模，本文通过对钢筋混凝土短柱的三维分析及多向力作用下的响应分析，验证了屈服前抗剪强度的尺寸效应，并对受拉构件的抗剪强度进行了数值模拟，得到了钢筋混凝土短柱屈服前抗剪强度的尺寸效应曲线。方向力的抗剪承载力和变形能力，以及不同比例的钢筋混凝土梁承受弯/剪力。进一步证实了无侧筋钢筋混凝土构件的延性可以通过屈服后剪切破坏的验证得到较好的预测。(4)钢筋混凝土框架结构抗震性能验算体系的建议对于钢筋混凝土框架结构，通过将三维非线性动力分析计算的作用在构件上的双向剪力与（3）中描述的承载力进行比较，提出了安全性验算体系。并通过对1995年神户大地震中受损铁路框架结构的应用，验证了该体系的有效性。