【作者】 张伟；

【导师】 韦锋； 朱袓敬；

【作者基本信息】 华南理工大学 ， 建筑与土木工程（专业学位）， 2016， 硕士

【摘要】 推广应用高强钢筋是贯彻落实科学发展观,促进经济发展方式转变,实现绿色发展的重要举措,而在推广应用高强钢筋的过程中还有不少问题有待分析和研究。国内已有不少学者针对高强钢筋应用性能的不同方面做过相关试验和理论分析,而其中对于配置高强钢筋结构的抗震性能理论研究还相对缺乏。为此,本文基于OpenSEES分析平台,完成了位于7、8、9度三个抗震设防烈度区,分别配置HRB400、HRB500及HRB600级钢筋的空间框架结构在双向地震动输入下的弹塑性地震反应分析,从整体位移反应和局部构件层次两个角度系统的总结了不同设防烈度区配置不同强度等级钢筋框架结构的地震反应规律。同时针对空间框架柱端出铰数量较多且有出现层侧移趋势的情况,采用等面积代换的原则仅在框架柱中配入高强钢筋以实现对结构屈服机制的控制,得到以下结论:(1)在位移反应方面,采用整体等强代换配置HRB500及HRB600级钢筋空间框架结构在双向地震输入下表现出与配置HRB400级钢筋的框架相似的反应特征,结构顶点位移及层间位移角均有所增大,但增大幅度较小且满足《规范》对于位移限值的要求。在局部反应方面,随着配筋强度等级的提高,结构杆端最大转角呈增大趋势,杆端出铰率显著下降,梁柱端转角延性需求均有所减小。总体上看,配置高强钢筋的框架结构抗震性能良好。(2)框架结构在双向罕遇地震作用下柱端出铰数量、转角延性需求及最大转角均明显大于梁端。虽然整体等强代换高强钢筋能够减少空间框架梁柱端的出铰数量,但整体上依然形成的是以柱铰为主的梁柱铰混合耗能机制,未能形成抗震设计所预期的“强柱弱梁”屈服机制。(3)采用等面积代换原则在柱中配置高强钢筋的方法虽无法完全避免柱端出铰,但能够显著的改善结构的屈服机制。结构柱端出铰数量显著降低梁端延性需求增加,表明空间框架梁将更多的参与地震耗能,使得结构因柱端出铰而形成的倒塌破坏几率大为减小,提高了结构的抗震能力。同时,柱中配置高强钢筋的框架结构其整体位移响应并未出现较大变化,进一步说明该思路可实现高强钢筋的优化配置,提高框架柱的安全储备。更多还原

【Abstract】 Promoting the application of high strength steel is an important measure to implement the scientific development concept, promote the transformation of economic development mode, realize green development, and in the process of promoting the application of high strength steel, there are still a lot of problems to be analyzed and studied. In China, many scholars have done a lot of experiments and theoretical analysis on the different aspects of the application performance of high strength steel, which is relatively lack of theoretical research on the seismic performance of high strength reinforced structure. Therefore, this paper analyzes the inelastic seismic response of concrete frame structure reinforced with high strength steel bars of HRB400、HRB500、HRB600 in the intensity region 7、8 and 9 under bi-directional earthquake motions based on OpenSEES framework. Meanwhile, as a lot of plastic hinges develop in the space frame column and story side-sway mechanism develops, the analysis adopts uniform section substitution principle by using high strength reinforcements in columns in order to control the structure yielding mechanism and get the following conclusions:(1)In the displacement response, the HRB500 and HRB600 steel frame structures using overall equal strength substitution show similar response characteristics of those using HRB400 under bi-directional earthquake motions, and structure maximum top displacement and story drift have increased limitedly, meet the requirements of the standard for the displacement limit. In the local reaction, with the increase of the strength grade of reinforcement, the maximum rotation angle of the structural member is increasing, the output of hinge is decreased, and the angle ductility demand of the beam and column end has both decreased. On the whole, high strength steel bars concrete frame structure has a great seismic performance.(2)The number of joints, the ductility demand and the maximum rotation angle of the column end are significantly larger than that of the beam end, which indicates that the bi-directional seismic action intensified the elastic plastic damage of the column. Although the overall strength of high-strength steel can reduce the substitution of hinge number space frame beam and column end, but still formed on the whole a column hinge dominated beam column hinge hybrid energy dissipation mechanism, failed to form the expected seismic design of "strong column weak beam" yield mechanism.(3)Using the method of uniform section substitution principle in column with high strength steel bars cannot completely avoid column hinges, but can significantly improve the the yield mechanism of the structures. The number of hinges at column end is significantly reduced, and the ductility demand of the beam is increased, which indicates that the space frame beam will be more involved in seismic energy consumption, which can greatly reduce the collapse probability of the structure caused by the hinges at column end. At the same time, the frame structure of high strength steel in the column has not changed greatly, and it is further explained that this method can realize the optimal allocation of high strength steel and improve the safety reserve of the frame column.更多还原