Analytical and Experimental Analysis of the Use of Wide Beam Frames in Active Seismic Zones

抗弯矩R/C框架，如果设计得当和详细，它们是非常延展性的系统，能够承受最强烈的地震输入运动。已经有大量的研究R/C梁与柱的连接，但至少有一个常见的连接问题没有得到充分的研究，即由宽浅梁和“正常”柱组成的框架系统的连接。在过去的十年中，它们也在有限的程度上用于中度到高度地震风险的地区。由于缺乏对这些框架系统的实验研究，相互矛盾的设计建议已经发展。由于宽梁连接在混凝土框架结构中并不罕见，并且由于缺乏关于包含这种连接的混凝土框架的行为和由此产生的地震反应的信息，因此显然需要对包含这种连接的钢筋混凝土框架进行精心规划的分析和实验调查。本研究项目的目标是将先前的试验结果与有限数量的新试验结果结合起来，生成模拟宽梁框架结构地震反应的分析模型。然后，结合分析和实验研究，制定详细的要求以及适当使用宽梁框架的建议，即，在哪些地震带，多少层数以及与其他哪些抗侧荷载系统相结合。本研究将通过实验室试验和有限元分析，对宽梁连接钢筋混凝土框架的抗震性能得出结论，并为更新此类连接的抗震设计规定提供依据。

Moment resisting R/C frames if properly designed and detailed they are very ductile systems capable of enduring the most severe earthquake input motions. There has been a substantial number of investigations of R/C beam to column connections, but at least one common connection problem has not been adequately researched, namely, connections in frame systems composed of wide shallow beams and `normal` columns. Over the last decade they have also been used to a limited extent in regions of moderate to high seismic risk. Due to the lack of experimental studies for these frame systems, conflicting design recommendations have been developed. Because wide beam connections are not uncommon in concrete frame construction, and because there is a lack of information on the behavior and resulting seismic response of concrete frames that contain such connections, there is a clear need for a well planned analytical and experimental investigation of reinforced concrete frames that contain such connections. The goal of this research project is to combine prior experimental results with a limited number of new test results to generate analytical models for simulating the seismic response of wide beam frame structures. Then, combine the analytical and experimental studies to develop detailing requirements as well as recommendations for the proper use of wide beam frames, i.e., in what seismic zones, for what number of stories and in combination with what other lateral load resisting systems. This study will draw conclusive understanding to the seismic behavior of reinforce concrete frame with wide beam connections through laboratory experiments and finite element analysis and the results could form the basis for updating seismic design provisions for such connections.