基于数据库的配筋砌体剪力墙受剪承载力可靠度研究

发布时间：2018-06-22 19:42

本文选题：试验数据库 + 砌体剪力墙　；参考：《湖南大学》2015年硕士论文

【摘要】：本文对中国、美国和新西兰三国现行的砌体规范中有关配筋砌块砌体剪力墙受剪承载力的设计公式进行了横向的对比,对比发现,中国规范的设计公式相比美国和新西兰规范的设计公式在考虑砌体对墙体受剪承载力的贡献时更加保守,而在考虑水平钢筋对墙体受剪承载力的贡献有所高估。本文收集了国内外有关配筋砌块砌体剪力墙受剪试验的试验数据,建立了一个共计118片试验墙体的数据库。利用数据库对三国规范的设计公式进行偏差计算和可靠度计算,并进行对比分析。结果表明,中国规范的设计公式在计算体对墙体受剪承载力的贡献时过于保守,而在计算水平钢筋对墙体受剪承载力的贡献时略有高估。从总体看,三国规范的设计公式均满足可靠度的要求,其中中国规范设计公式留有的安全裕度最多,设计偏于保守,而美国规范的设计公式较为合理,新西兰规范的设计公式介于两者之间。参考对比分析的结果并利用数据库进行拟合分析,对中国规范的平均值计算公式的相关参数进行调整,对修改后的平均值计算公式进行偏差计算并对比原平均值计算公式的偏差计算结果。对比发现修改后的平均值计算公式能够更加准确、合理的反映配筋砌块砌体剪力墙受剪承载力。基于修改后的平均值计算公式建立一个新的设计公式,通过偏差计算和可靠度计算与原设计公式做对比。结果表明新设计公式在可靠度比原设计公式可靠度有所减少(仍满足规范可靠度的要求)的情况下,在一定程度上解决了原设计公式在计算砌块对墙体受剪承载力的贡献时偏于保守,而在计算水平钢筋对墙体受剪承载力的贡献时略有高估的问题。使其在设计上变得更为合理。
[Abstract]:In this paper, the design formulas of shear capacity of reinforced block masonry shear walls in the current masonry codes of China, the United States and New Zealand are compared horizontally. The design formula of the Chinese code is more conservative than that of the American and New Zealand codes in considering the contribution of masonry to the shear bearing capacity of the wall, while the contribution of horizontal reinforcement to the shear bearing capacity of the wall is overestimated. In this paper, the experimental data of shear test of reinforced block masonry shear wall at home and abroad are collected, and a database of 118 test walls is established. The deviation calculation and reliability calculation of the design formulas of the three countries' specifications are carried out by using the database, and the results are compared and analyzed. The results show that the design formula of the Chinese code is too conservative in calculating the contribution of the body to the shear bearing capacity of the wall, but slightly overestimated in the calculation of the contribution of horizontal reinforcement to the shear capacity of the wall. On the whole, the design formulas of the codes of the three countries all meet the requirements of reliability. The Chinese code design formula has the most safety margin and the design is conservative, while the design formula of the American code is more reasonable. The design formula of the New Zealand Code is somewhere in between. Referring to the results of comparative analysis and using the database for fitting analysis, the relevant parameters of the formula for calculating the average value of the Chinese standard are adjusted. The deviation calculation of the modified average value calculation formula is carried out and the results of deviation calculation of the original average value calculation formula are compared. It is found that the modified formula can reflect the shear capacity of reinforced block masonry shear wall more accurately and reasonably. A new design formula is established based on the modified formula of mean value. The deviation calculation and reliability calculation are compared with the original design formula. The results show that when the reliability of the new design formula is less than that of the original design formula, the reliability of the new design formula still meets the requirements of the specification reliability. To some extent, the original design formula is conservative in calculating the contribution of block to shear capacity of wall, but slightly overestimated in calculating the contribution of horizontal reinforcement to shear capacity of wall. Make it more reasonable in design.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU364

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