地震作用设计参数调整对框架结构抗震设计及安全性的影响

发布时间：2018-04-17 12:40

本文选题：地震作用 + 钢筋混凝土框架　；参考：《工程力学》2017年04期

【摘要】：汶川、芦山等大地震震害经验表明:地震中建筑遭受的实际烈度经常远高于规范规定的设防烈度,这导致建筑结构在地震中受到非常严重的破坏。虽然随着规范的改进和新的设防区划图的提出,我国建筑抗震的安全水准在不断提升,但是很多专家仍认为目前建筑结构的抗震安全储备偏低。因此,确定合理的地震作用对保证建筑结构的抗震安全性有重要意义。该文以基于2010版《建筑抗震设计规范》设计的一系列钢筋混凝土框架结构为研究对象,通过调整地震动力放大系数、地震作用和荷载分项系数等参数的取值,对框架进行重设计,并对框架结构进行倒塌分析,研究地震作用设计参数调整对框架结构的设计控制指标、地震力、材料用量和抗震安全性造成的影响。研究结果表明:调整措施将使底层柱轴压比增大约8%;楼板和框架梁的钢筋用量提高约6%;对初始破坏始于底层的倒塌模式,调整措施能明显提高结构的抗震安全性,但随着设防烈度提高,地震下抗倒塌能力的提高程度略有降低。
[Abstract]:Wenchuan, Lushan earthquake disaster experience show that the actual intensity of building earthquake fortification intensity is much higher than that of the current standard, which leads to the building structure very serious damage in the earthquake. Although with the normative improvement and new fortification zoning map, security level of our building aseismic was on the rise, but many experts still believe that the low reserves of seismic safety of building structure at present. Therefore, to determine the proper earthquake action is important to ensure the seismic safety of building structures. The 2010 edition of < seismic design specification design based on a series of reinforced concrete frame structure as the research object, by adjusting the seismic amplification coefficient and the value of earthquake action and partial load coefficient, re design of the frame, and the frame structure collapse analysis, research on seismic design parameters adjustment The design of the whole control index of frame structure seismic force, influence of material dosage and seismic safety caused. Research results show that the adjustment measures will make the bottom column axial compression ratio is about 8%; the floor and frame beam of steel consumption increased by about 6%; the initial damage began in the bottom of the collapse mode, adjustment measures can significantly improve the seismic the safety of the structure, but with the increasing degree of seismic fortification intensity, improve the anti collapse ability decreased slightly.

【作者单位】：北京交通大学土木建筑工程学院;清华大学土木工程系;中国建筑设计院有限公司;北京建筑大学土木与交通工程学院;
【基金】：国家自然科学基金项目(51408034,51378299) 中央高校基本科研业务费专项资金项目(2015RC057)
【分类号】：TU352.11

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