INELASTIC RESPONSE OF A MOMENT-RESISTING REINFORCED CONCRETE FRAME BUILDING SUBJECTED TO MULTI-COMPONENT STRONG GROUND MOTIONS

对一种抗弯矩弱梁强柱钢筋混凝土建筑结构体系的抗震问题进行了探讨。采用了解析模型，计算了非弹性地震反应。近年来，随着高强混凝土和钢筋的发展，高层钢筋混凝土建筑结构可以设计得具有较高的抗震性能。在设计中，规定了一个理想的屈服机构，可以预期大量的能量耗散。屈服铰产生于梁构件的两端。不应在柱构件的末端生产屈服铰链。柱被设计得很坚固，因此在强烈的地震作用下不应产生塑性铰。在这种设计理念下，应该对抗弯矩框架规定一定程度的强度。由于框架的强度不会太大，所以在框架内有更多的梁构件，当建筑物遭受强烈地震作用时，就会产生屈服铰链。当建筑物受到多分量地震作用时，这些问题是重要的。在车架的纵向和横向上，都会产生屈服机制。在本文的研究中，研究了以下两个具体问题：一是梁、梁均产生屈服铰时对柱的双轴弯矩作用；二是梁、梁两侧沿横向和纵向均产生屈服铰机构时，柱，尤其是位于建筑物角落处的柱，可能会产生较大的轴向荷载波动。生成了代表60层高层建筑的分析模型。分析中采用了一组强运动记录。强地面运动的多分量由沿地面运动过程的主轴计算得到的主分量来表示。通过定量的分析研究，验证了所定义的屈服柱强度的双轴效应系数。少

Seismic resisting issues on a moment-resisting weak-beam strong-column reinforced concrete building structural system are examined and discussed. An analytical model is employed, and inelastic seismic responses are evaluated.Recently, with the development of high strength concrete and reinforcing steel bars, high-rise reinforced concrete building structures can be well designed with high seismic resisting performance. Within the design, a desirable yielding mechanism is prescribed with which a large amount of energy dissipation can be expected. Yielding hinges are generated at the ends of beam members. Yielding hinges should not be produced at the ends of column members. Columns are designed strong so as plastic hinges should not be generated during an intense seismic action. With this design concept, a certain level of strength should be specified to the moment-resisting frames. Since the amount of frame strength would not be so great not to generating hinges at the ends of constituen … More t beam members within the frame, yielding hinges are produced when the building suffers from an intense seismic action. The issues are of significant when the building is subjected to a multi-component seismic action. Within the frame in both longitudinal and transverse direction, yielding mechanisms would be generated.Within the study presented herein, the following two specific issues are examined : the first is that on the bi-axial moment action on the coltumns when the yielding hinges are generated at both girders and beams, and the second is that a large amount of axial load fluctuation can be expected for the column, especially that placed at the corner of the building, when the yielding hinge mechanism are produced at both frames positioned along the transverse and longitudinal directions.Analytical models are generated representing a 60-story high-rise building. A set of strong motion records are utilized in analysis. The multi-component of strong ground motions are expressed by the so-defined principal components obtained along the principal axes evaluated for ground motion processes. The so-defined bi-axial effect coefficients to yield the column strengrth great are examined through the analytical study in a quantitative manner. Less