2014年5月下 施工技术 第43卷第10期 CONSTRUCTION TECHNOLOGY 55 D0I:10.7672/sgj2014100055 体外预应力法在某框架承重墙拆除改造中的应用* 李果，刘斌，杨坤，姚峰 (中国矿业大学江苏省土木工程环境灾变与结构可靠性重点实验室，江苏徐州221116) [摘要]某多层混凝土框架结构由于使用用途的改变，需要对部分地下室混凝土承重墙拆除.为保证原结构的受 力安全，在综合考虑使用要求、变形性能以及抗震承载力安全的基础上，采用体外有黏结预应力和U形增大截面相 结合的方法进行了改造加固设计与施工.施工安全监测结果表明：在预应力筋张拉和承重墙拆除过程中，结构的 应变发展符合理论预期值，结构的整体挠度变形很小，且没有裂缝出现.结构的改造和加固是安全的，实现了预期 的改造目的. [关键词]改造；加固；框架结构；体外预应力法；拆除 [中图分类号]TU746.3 [文献标识码]A [文章编号]1002-8498(2014)10-0055-04 Application of External Prestressing Strengthening Method in a Bearing Walls Demolition and Reconstruction Project Li Guo Liu Bin Yang Kun Yao Feng Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering of China University of Mining Technology Xuzhou Jiangsu 221116 China Abstract:Due to changes of service purposes some basement bearing walls in a multilayer concrete frame structure need to be reconstructed.To ensure the safety of the original structure considering the service requirements deformation performances and anti-seismic capacity a reconstruction and strengthening design was made with external bonded prestressed strengthening and U-shaped cross section enlargement method together and a detailed construction scheme was also made.Results of construction safety monitoring show that during the pre-stressing tensioning and removing of the bearing walls the strain developments of the structure are consistent with analysis results by theory and the whole deflection deformation of the structure is very small an...
体外预应力法在某框架承重墙拆除改造中的应用.pdf
