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隔震结构的基础对上部结构的水平位移和抗转动约束力较弱,施工建造阶段的受力性能具有特殊性。对超长复杂隔震钢筋混凝土结构体系而言,叠层橡胶隔震支座在施工阶段出现了较大侧向位移的现象。施工方案考虑不周全时,隔震层大梁在施工阶段混凝土甚至会出现裂缝。该文介绍了课题组针对平面不规则超长复杂隔震结构建造过程施工力学分析。将施工过程中的时变结构体系分析问题采用离散性的时间冻结来近似处理,将它当作一序列物性时不变、拓扑关系在各个预定的时间点上变化的结构体系分析。数值分析表明,SCS方式是一种宜用于隔震结构的安全经济的施工方式;隔震层大梁出现裂缝主要是由施工荷载、温度剧烈变化、混凝土收缩及过早拆模等综合因素引起的;分析了由施工建造引起的非载荷变形对隔震支座变形位移、底板的变形和内力的影响;分析了最不利温差作用下的隔震支座位移及施工阶段梁挠度的变化规律,初步给出了后浇带的合理布置方案。通过对实际隔震工程的施工期及服役期的现场监测,验证了超长隔震结构的非载荷变形特征与环境荷载的相关性。
The foundation of the isolation structure has a weak horizontal displacement and anti-rotation restraint on the superstructure, and the bearing capacity of the construction phase is special. For the long and complex isolated structure of reinforced concrete structure, laminated rubber bearing stand in the construction phase of a larger lateral displacement phenomenon. When the construction plan is not considered properly, the concrete girders of the seismic isolation girders may even show cracks in the construction phase. This paper introduces the construction mechanics analysis of the project team for the construction of plane irregular long and extremely complex isolation structure. The problem of time-varying structural system analysis in construction process is approximated by discrete time-freezing. It is treated as a structural system analysis that the invariance of topological relations does not change in a sequence of physical properties and at various predetermined time points. Numerical analysis shows that the SCS method is a safe and economical construction method that is suitable for the isolation structure. The cracks in the isolation girder are mainly caused by the comprehensive factors such as construction load, drastic temperature change, concrete shrinkage and premature demolition The influence of non-load deformation caused by construction on the deformation and displacement, the deformation and internal forces of the isolated bearing was analyzed. The displacement of the isolated bearing under the most unfavorable temperature difference and the variation of beam deflection during the construction stage were analyzed. The reasonable arrangement of post-pouring belt is given. Through the on-site monitoring of the construction period and service period of the actual seismic isolation project, the correlation between non-load deformation characteristics and environmental load of the ultra-long isolation structure was verified.