翼缘宽度对预期损伤部位采用FRC增强的梁柱组合件破坏机制影响的试验研究及数值模拟

发布时间：2018-01-09 05:22

本文关键词：翼缘宽度对预期损伤部位采用FRC增强的梁柱组合件破坏机制影响的试验研究及数值模拟　出处：《土木工程学报》2016年12期 　论文类型：期刊论文

【摘要】：为研究现浇板翼缘宽度和纤维增强混凝土(FRC)材料对框架结构破坏机制的影响,设计制作一组纵梁腹板两侧各6倍和8倍板厚翼缘宽度,且带有横交梁的梁柱组合件,试件的预期损伤部位采用FRC材料,柱梁抗弯承载力比分别取1.2和1.4;对试件进行拟静力试验,考察试件的破坏过程和破坏形态,分析其破坏机制和翼缘板内钢筋的应变分布,研究试件的变形和耗能能力、强度和刚度退化等抗震性能。在试验研究基础上,对试件原型破坏过程进行数值模拟,并进行了参数分析。结果表明,预期损伤部位范围内的梁、柱和板采用FRC材料,在一定程度上可以减小板对梁抗弯承载力影响的范围,易于实现"强柱弱梁"的破坏机制;考虑8倍板厚翼缘宽度的梁柱组合件更易于实现"强柱弱梁"的破坏机制,并且能显著降低其强度退化系数,提高其耗能能力。
[Abstract]:In order to study the influence of flange width of cast-in-place slab and fiber reinforced concrete (FRC) material on the failure mechanism of frame structure, a set of longitudinal beam webs were designed and fabricated, which were 6 and 8 times thick flange width respectively. The expected damage site of Liang Zhu composite with cross beam is FRC material, the ratio of bending capacity of column beam is 1. 2 and 1. 4, and the bending capacity ratio of column beam is 1. 2 and 1. 4 respectively. The quasi-static test was carried out to investigate the failure process and failure form of the specimen, to analyze the failure mechanism and the strain distribution of the steel bar in the flange plate, and to study the deformation and energy dissipation capacity of the specimen. Based on the experimental study, the failure process of the prototype is simulated and the parameters are analyzed. The results show that the beam is in the range of expected damage. The FRC material used in columns and slabs can reduce the range of the influence of plates on the flexural capacity of beams to some extent, and it is easy to realize the failure mechanism of "strong columns and weak beams". The failure mechanism of "strong column and weak beam" can be realized more easily by taking into account 8 times the width of thick flange of plate, and the strength degradation coefficient can be significantly reduced and the energy dissipation capacity can be improved.
【作者单位】：西安建筑科技大学;
【基金】：国家自然科学基金(51278402,51078305)
【分类号】：TU37
【正文快照】： 引言现浇楼板对框架结构“强柱弱梁”破坏机制有明显的影响。震害调查显示[1-2],忽略现浇楼板影响而设计的框架结构多数未能达到预期的破坏机制,表现为“强梁弱柱”的破坏机制。由于现浇楼板能够提高框架梁的抗弯刚度和抗弯承载力,因此对柱梁抗弯承载力比会产生影响[3],而柱梁

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