钢筋混凝土高层建筑结构基于位移的抗震设计方法研究  

Research on Displacement-based Seismic Design Method of RC High-rise Structure

作　　者：梁兴文[1] 邓明科[1] 李晓文[1] 李方圆[1] 

机构地区：[1]西安建筑科技大学,710055

出　　处：《建筑结构》2006年第7期15-20,共6页Building Structure

基　　金：陕西省教育厅专项基金项目(01JK169);陕西省自然科学基金项目(2001C26)。

摘　　要：将钢筋混凝土高层建筑结构的性能划分为三个水平,即使用良好、人身安全和防止倒塌,并用层间侧移角限值予以量化。选作用倒三角形分布荷载的等截面悬臂杆的侧移曲线,作为框架结构、剪力墙结构和框架剪力墙结构的初始侧移模式,对于使用良好性能水平,由性能水平和初始侧移模式确定其目标侧移曲线,然后确定等效单自由度体系的等效参数以及原多自由度体系的基底剪力和各质点的水平地震作用,进而进行构件截面承载力设计。对按此设计的结构进行推覆分析,校核结构的侧移形式与所采用的初始侧移曲线是否一致,并用相应的推覆曲线作为修正后的目标侧移曲线重新计算,直至满足为止。对于人身安全和防止倒塌性能水平,直接用达到其相应性能水平的推覆曲线作为目标侧移曲线,计算相应的等效位移和基底剪力,并绘出需求曲线,根据需求曲线与推覆曲线的关系调整设计结果。算例表明方法简单实用。According to the characteristic of high-rise structure, its seismic performance level is divided into three levels： serviceability, life-safety, and collapse protection. The three levels are qualified with story drift angles. Applying the inverted triangular distribution of lateral force to the cantilever member with identical section, the displaced shape of it is regarded as the initial lateral displacement mode of the frame structure, shear wall structure and frame-shear wall structure. In the serviceability performance level, the target lateral displacement is determined by the performance level and initial lateral displacement mode of the structure. Afterward, the equivalent parameters of single-degree-of-freedom system and the base shear and horizontal earthquake action of every mass of multi-degree-of-freedom system can be determined, and then the structural members can be designed. Finally, the designed structure is analyzed with pushover method. If the drift curve is not identical with the initial assumed shape, then the pushover drift curve is regarded as the modified drift shape to recalculate till it is required. In the life-safety and collapse protection performance level, the pushover drift curve reached the corresponding performance level is regarded as the target lateral displacement curve. Then the equivalent displacement and the base shear can be calculated, and the required curve can be drawn. The result of calculation is adjusted according to the relationship of the required curve and pushover curve.

关 键 词：钢筋混凝土结构 基于位移的抗震设计 性能水平 侧移模式 

分 类 号：TU352[建筑科学—结构工程] TU973