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在优化结构方案的基础上采用有限元方法进行结构分析,这样就提出选择无粘结预应力砼技术设计桁架杆件截面。在施工中考虑分批择期张拉预应力筋的工艺,在施工现场跟踪检测桁架杆件关键受力部位的应力状态,以便与设计相互认证,这两项研究成果在同类工程研究中尚未同时采用。从结构形式的确定到结构实现过程采用优选的技术与方法,针对多高层建筑对底层大空间越来越多的需求,研究成果可为同类工程提供借鉴,有广泛的推广应用前景。为此要设置结构转换层,目前国内外已有一些工程实践。针对工程中采用的大跨度无粘结预应力砼转换桁架的受力状态进行了有限元分析,结果完成结构设计,为实现结构设计对“转换层”提出的更高要求作了有益的尝试。
Based on the optimized structure scheme, the finite element method is used to analyze the structure. Thus, the design of truss member section with no bond prestressed concrete technology is proposed. Considering the process of tensioning prestressed tendons in batches in construction, the stress state at key stress sites of truss members is tracked at the construction site so as to be mutually authenticated with the design. These two research results have not been used in the same kind of engineering studies at the same time . From the determination of the structure form to the realization of the structure, the preferred techniques and methods are adopted. According to the increasing demand of multi-high-rise buildings on the large-scale underground space, the research results can provide reference for similar projects and have a wide range of application prospects. To this end, we have to set up a structural transformation layer. At present, there are some engineering practices both at home and abroad. The finite element analysis of the stress state of the long-span unbonded prestressed concrete truss used in the project has been carried out. As a result, the structural design is completed, which is beneficial for the structural design to meet the higher requirements of the “conversion floor” try.