新型自复位约束砌体墙力学及抗震性能研究

The self-centering structure is characterized by its minimal residual deformation after unloaded completely. It can resume normal service after strong earthquake with little or no rehabilitation. This type of structure has been given more and more emphasis in performance-based seismic design. Based on the previous studies by other researchers, a new type of self-centering confined masonry wall (SCCMW) with low cost is developed in this proposal considering the current situation in our country. After the mechanical behavior of the new type of SCCMW is explored thoroughly, its seismic performance is further studied by way of shake-table test and numerical analysis. The studies involved in this proposal mainly include: developing a new type of SCCMW; establishing the mechanical analysis model for the new type of SCCMW considering the influence of both unbonded prestressed tendon and damping device and investigating its mechanical behavior; studying comparatively the seismic performance of SCCMW and monolithic confined masonry wall (MCMW) by way of shake-table test and investigating the influence of various damping device schemes on the seismic performance of the new type of SCCMW; setting up the simplified and practical numerical analysis model based on the shake-table test results and studying the influence of various design parameters on its seismic performance. Currently the study and application associated with the self-centering structure especially for SCCMW is very insufficient in our country, therefore the research in this proposal has very important theoretical meaning and engineering application merit.

自复位（Self-centering）结构卸载后残余变形很小，震后无需或经少量修复即可恢复正常使用，这种新型结构在基于性能的抗震设计中越来越受到重视。本项目在前人研究的基础上，结合我国的国情，提出一种低成本的新型自复位约束砌体墙，在探明其力学机理的基础上，进一步通过振动台试验及数值分析研究其抗震性能。本项目的主要研究内容包括：研制新型自复位约束砌体墙；考虑无粘结预应力筋和阻尼器的影响，建立新型自复位约束砌体墙的力学分析模型，研究其力学性能；基于振动台试验，对比研究新型自复位约束砌体墙试件及底部嵌固约束砌体墙试件的抗震性能，研究不同阻尼器方案对新型自复位约束砌体墙抗震性能的影响；基于振动台试验结果，建立新型自复位约束砌体墙简化实用的数值分析模型，研究不同设计参数对其抗震性能的影响。自复位结构特别是自复位约束砌体墙在我国的研究和应用目前还很少，因此本项目的研究具有重要的理论意义和工程应用价值。

自复位（Self-centering）抗震结构卸载后残余变形很小，震后无需或经少量修复即可恢复正常使用，这种新型的结构在地震工程界越来越受到重视。本项目提出了二种低成本的新型自复位约束砌体墙，重点研究了其力学及抗震性能。本项目的主要研究内容及成果如下：分别研制了外置摩擦阻尼器及金属阻尼器的新型自复位约束砌体墙，提出了相应的构造措施；考虑预应力筋和阻尼器的影响，建立了往复荷载作用下新型自复位约束砌体墙的理论分析模型，通过理论推导得出了水平力－转角曲线，探明了其受力机理及滞回性能；基于拟静力试验，研究了新型自复位约束砌体墙的抗震性能，重点考察了预应力筋及阻尼器设计参数对其滞回性能的影响；基于试验结果，建立了新型自复位约束砌体墙简化实用的数值分析模型。自复位抗震结构目前在我国的研究和应用还较少，本项目的研究能为自复位约束砌体墙在我国抗震设计及加固中的应用提供理论依据和重要参考。