Experimental study on seismic behavior of semi-rigid connection between steel beam and concrete wall

Beam-column or beam-wall connections are an important problem in high-rise buildings. In this study, based on the analysis of an example structure, an analytical model for design of the semi-rigid connections between steel beams and RC walls in high-rise hybrid buildings is proposed. Also, the mechanical characteristics of these connections subjected to low-reversed cyclic loading are investigated through comparison of experimental results from three semi-rigid connections and two rigid connections. Moreover, some latent problems for design of these connections as well as the corresponding solutions are discussed. The results from the experiments and analyses indicate that semi-rigid connections exhibit satisfactory capacity and seismic performance, and the proposed design can be used in practice.

高压旋喷桩止水帷幕在人民日报社报刊综合业务楼中的应用

人民日报社报刊综合业务楼深基坑止水采用在基坑外侧喷射注浆形成一道连续防水墙,连续止水帷幕和护坡桩相结合的方法,在基坑四周封堵。经严格控制,取得了良好的施工效果,有效地控制了地下水,保证了基坑的安全和后续施工的顺利进行。具体阐述了止水帷幕技术要求及施工方法,总结了施工质量的控制要点。

钢筋冷挤压技术在超长混凝土灌注桩施工中的应用

人民日报社报刊综合业务楼工程采用钢筋冷挤压技术对钢筋笼空中对接工艺进行调整,减少工序交接时间从而减少工程质量问题。指出工程桩施工的难点,提出采用钢筋冷挤压技术进行灌注桩施工。具体讲述了桩基施工步骤、施工要求及施工中的注意事项,极大地降低了由于钢筋对接时间过长而引起的成桩质量问题的概率。