基于性能的既有砌体结构抗震加固及优化研究

发布时间：2018-04-21 22:49

本文选题：基于性能的抗震设计 + 既有砌体结构　；参考：《中国石油大学（华东）》2013年硕士论文

【摘要】：我国既有砌体结构数量较多，材料本身的强度低、延性差，再加上设计的低标准、施工的不规范操作、老龄化以及对性能要求的提高，使得既有砌体结构的安全性不能得到保证，由于昂贵的拆建费用、拆除对正常生活秩序和环境的严重影响以及抗震性能设计方法的发展，使得对既有砌体结构进行基于性能的抗震加固研究很有必要。本文对建筑抗震性能设计、既有砌体结构的地震时程分析、既有砌体结构加固以及加固优化等问题进行了深入地研究，为工程实际应用和相关规范规程的修订提供可靠的技术资料，主要研究了以下几个方面： 1．总结归纳了既有砌体结构在检测、鉴定和加固方面的一些问题，分析了现行规范规程和计算软件在既有砌体结构的检测、鉴定和加固中存在的不足和矛盾，并提出了相应的解决方案。 2．根据新建结构的地震水平，提出了后续使用年限为30年和40年的结构在多遇地震、抗震设防地震和罕遇地震的地震水平；考虑结构重要性、社会影响、人员伤亡、结构损伤、内部设施损伤、直接经济损失、间接经济损失等影响建筑抗震性能水平的因素，对每一个因素划分等级后评分，使抗震性能水平得到量化；将结构性能目标连续化，提出了性能水平分值与层间位移角限值的关系式。 3．根据场地条件和结构条件对多条强震记录波和人工拟合波进行筛选，天津波、迁安波和一条人工地震波能够较好的与实际条件相吻合；根据当地的地震水平，对天津波、迁安波和人工地震波在多遇地震、抗震设防地震和罕遇地震的峰值加速度调整；分析有效持续时间，最终得到合适的地震波时程加速度。 4．对实际工程简化建立有限元模型，对结构1和结构2用处理后的天津波、迁安波和人工波进行动力时程分析，在结构每一层读取相对应的3个节点最大位移值，取平均值作为反映该楼层位移的代表值，将层间位移角最大值与性能目标相比较，，结果表明，结构1和结构2都不满足抗震性能要求，需要对其加固。 5．根据当地情况，对结构1和结构2的加固方法进行比选优化，对采用钢筋网片水泥砂浆加固法的面层位置和厚度进行优化，最后分析加固结果并评价加固效果。
[Abstract]:There are many masonry structures in our country, the strength of the material is low, the ductility is poor, plus the low standard of design, the nonstandard operation of construction, the aging of the masonry structure, and the improvement of the performance requirements. The safety of existing masonry structure can not be guaranteed, because of the high cost of demolition and construction, the serious impact of demolition on normal living order and environment, as well as the development of seismic performance design method, It is necessary to conduct performance-based seismic reinforcement of existing masonry structures. In this paper, the problems of seismic performance design, seismic time history analysis of masonry structure, reinforcement and optimization of masonry structure are studied. To provide reliable technical data for practical engineering application and revision of relevant specifications, the following aspects are mainly studied: 1. This paper summarizes some problems in the inspection, appraisal and reinforcement of existing masonry structures, and analyzes the shortcomings and contradictions existing in the inspection, appraisal and reinforcement of existing masonry structures by the current code and calculation software. And put forward the corresponding solution. 2. According to the earthquake level of the newly built structure, the earthquake level of the structure with the following service life of 30 years and 40 years is put forward in the frequent earthquake, seismic fortification and rare earthquake, considering the importance of the structure, the social impact, the casualties, the damage of the structure, Internal facility damage, direct economic loss, indirect economic loss and other factors affecting the seismic performance level of buildings, each factor is graded to make the seismic performance level quantifiable, and the structure performance goal is continuous, The relationship between the level of performance and the limit of the displacement angle between the floors is presented. 3. According to site conditions and structural conditions, several strong earthquake recorded waves and artificial fitting waves were screened. Tianjin wave, Qian'an wave and an artificial seismic wave can be well matched with actual conditions; according to the local earthquake level, the Tianjin wave, The peak acceleration adjustment of Qian'an wave and artificial seismic wave is obtained by analyzing the effective duration of earthquake fortification earthquake and rare earthquake. Finally the appropriate time-history acceleration of seismic wave is obtained. 4. The finite element model is established for the simplification of practical engineering. The dynamic time history analysis of Tianjin wave, Qian'an wave and artificial wave after structure 1 and structure 2 is carried out, and the corresponding maximum displacement values of three nodes are read in each layer of the structure. Taking the average value as the representative value to reflect the displacement of the floor, the maximum displacement angle of the floor is compared with the performance target. The results show that both structure 1 and structure 2 do not meet the requirements of seismic performance and need to be strengthened. 5. According to the local conditions, the reinforcement methods of structure 1 and structure 2 are compared and optimized, and the position and thickness of surface layer are optimized by using reinforced mesh cement mortar reinforcement method. Finally, the reinforcement results are analyzed and the reinforcement effect is evaluated.
【学位授予单位】：中国石油大学（华东）
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU364;TU352.11

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