【作者】 李龙；

【导师】 尚守平；

【作者基本信息】 湖南大学 ， 土木工程， 2015， 硕士

【摘要】 近年来的地震灾害统计表明,我国广大农村地区的砌体房屋有一大部分抗震能力不足,这也导致了砌体结构在地震作用下受损比其他结构严重的多。针对传统砌体结构所采用混凝土圈梁、构造柱繁琐的施工工序,本文提出了用砌体与HPFL组合圈梁构造柱,抗震性能好且施工简单。多层砌体结构所受的水平地震作用主要由墙体及高性能水泥复合砂浆钢筋网薄层(HPFL)条带与砖砌体组合而成的圈梁构造柱弱框架体系两部分承担,当地震作用足够大时,中间的墙体会产生交叉斜裂缝甚至倒塌,剩下周边的HPFL条带与砖砌体组合成的圈梁构造柱结构体系单独来承担地震作用。本文通过足尺寸模型的砌体与HPFL组合圈梁构造柱的振动台试验,来分析组合结构的抗震能力。试验结果表明,当荷载取为一层荷载,砌体与HPFL组合圈梁构造柱结构加固条带宽度为240mm时,抵抗变形能力比加固宽度为180mm宽提高了将近三成,以此相同条件下加固条带的抗震效果与宽度成正比。与单面加固相比,双面加固的抗震效果更好,其抗震承载能力有大幅提高,最高可以提高将近六成。砌体与HPFL组合圈梁构造柱有着良好的抗震性能,既可以对已有砌体房屋进行加固也适合新建砌体房屋,砌体与HPFL组合圈梁构造柱可以代替传统的砖混结构。根据试验结果和理论分析,本文提出了HPFL窄条带抗震计算公式,可供工程结构设计时参考使用。对本次试验,当抗震设防烈度为6度时,HPFL条带宽度宜取180mm,并当为一种构造措施;当抗震设防烈度为7度时,HPFL条带宽度宜取240mm;当抗震设防烈度为8度时,HPFL条带宽度宜取360mm。更多还原

【Abstract】 Previous earthquake experience shows that, Damage under seismic action to rural low-rise masonry buildings mostly lacking of seismic capacity considering seismic fortification is the most common and serious compare to other structure forms.Setting reinforced structural concrete column and ring beam is an effective measure to improve the seismic capacity of masonry structure. In view of the complex process of the traditional structural concrete column and ring beam, the simple form of HPFL and brick masonry combined ring beam and structural column was proposed. Horizontal seismic action on multistory masonry structures is assumed by two parts to share: walls and weak frame combined ring beam and structural column. When the earthquake is large enough,the wall will have cross-diagonal cracks even collapse, Remaining HPFL Strip weak frame combined ring beam and structural column with brick masonry structure system alone to take the role of seismic. In this paper, through HPFL narrow strip combined brick of circle beam and structural column full-scale model shaking table test to observe and analyze its aseismic ability. Experimental results show that, resistance capability to deformation of one layer load “weak framework” model that strengthened with 240 mm wide HPFL is higher than 180 mm width by 30%,but also the maximum acceleration is 1.8 times the 180 mm wide HPFL’s, so the larger the HPFL reinforcement width, the better the seismic effects. Seismic bearing capacity of two sides HPFL stripe reinforcement is higher than single side’s, with the increase exceeding 60%, two sides HPFL stripe reinforcement has more obvious anti-seismic effects than single side’s. Strengthening brick ring beam and brick structural column with HPFL narrow stripe can improve the cracking load of the structure, seismic effects of HPFL-Brick ring beam and structural column composite structure is obvious. Therefore it can completely substitute for the RC ring beam and structural column. HPFL narrow strip combined brick of ring beam and structural column has obviously seismic effect, Not only can strengthen brick masonry buildings which are existing but also suitable for new housing. Using HPFL ring beam and structural column to replace traditional concrete ring beam and structural column is feasible. According to the analysis of the experiment results and theories, a calculation method is proposed for predicting the seismic capacity of perforated brick masonry strengthened by HPFL, which is a reference for the strengthening engineering design.This paper then, based on the analysis of the test data, puts forward some suggestions about how to choose the HPFL reinforcement width in engineering. When the seismic fortification intensity is 6 degree below, the recommended reinforcement width of HPFL is 180 mm,and as a construction measures. When the seismic fortification intensity is 7 degree, you can choose the HPFL reinforcement width of 240 mm. while fortification of 8 degree, you’d better use the double-sided HPFL of 360 mm width.更多还原