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首页> 外文会议>Structural Engineers Association of California(SEAOC) Convention; 20050928-1001; San Diego,CA(US) >Buckling Restrained Braced Frames Strengthen A Non-Ductile Concrete High-Rise Tower
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Buckling Restrained Braced Frames Strengthen A Non-Ductile Concrete High-Rise Tower

机译：屈曲约束支撑框架加固了非韧性混凝土高层塔

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摘要

This paper describes the innovative seismic retrofit of the Webb Tower located on the campus of the University of Southern California in Los Angeles. The existing 14-story residential structure was constructed circa 1972 using light-weight concrete and has a plan dimension of approximately 75 ft x 105 ft. The lateral system for the building consists of perimeter non-ductile post-tensioned concrete moment frames supported on isolated spread footings. A preliminary evaluation of the building revealed seismic deficiencies, including the following: (1) non-ductile detailing, such as lack of column and beam confinement reinforcement and (2) excessive building deflections. In addition to addressing the structural seismic deficiencies of the existing building, the University required that a seismic retrofit solution be developed that is: (1) aesthetically acceptable, since it is one of the taller buildings on campus, (2) non-intrusive, (3) minimizes interior construction work, and (4) allows open views for the student residents. After considering several alternate retrofit schemes, which included adding exterior and/or interior concrete shear walls and exterior conventional steel braced-frames, a unique seismic retrofit scheme was developed utilizing a single bay of buckling-restrained steel braces in combination with a reinforced concrete beam-column frame on each side of the building. The braced-frames are intended to be the primary lateral-force resisting system and are supplemented by the existing moment frames. The retrofit scheme was designed and evaluated according to a two-level performance-based approach that meets the following objectives: (1) "Life Safety" performance for a Design-Basis (475-yr) earthquake and (2) "Collapse Prevention" performance for a Maximum Considered (2500-yr) earthquake level. A three-dimensional nonlinear computer model was developed capable of capturing the nonlinear behavior of the buckling-restrained braces, the existing concrete beams and columns with consideration for the post-tensioning effect, and the new concrete beams and columns. The seismic performance of the retrofitted building was investigated by time history analyses using seven sets of ground motion time history records. The selection of the buckling-restrained braced-frame system provides several advantages for this project over other retrofit schemes, including: (1) Provides partial views from the existing windows, (2) requires significantly less demolition than an interior scheme, (3) more cost-effective than an interior solution, (4) reduces building drift and demands on the non-ductile moment frames, and (5) buckling-restrained braces do not exhibit strength degrading and aesthetically unacceptable post-buckling deformations.
机译：本文介绍了位于洛杉矶南加州大学校园内的韦伯大厦的创新抗震改造。现有的14层住宅结构是在1972年左右使用轻质混凝土建造的，平面尺寸约为75英尺x 105英尺。该建筑的侧向系统由周向非延性后张拉混凝土矩框架组成，并支撑在独立的框架上。扩大基础。对建筑物的初步评估显示出地震方面的缺陷，其中包括：（1）非延展性细部，例如缺少柱和梁约束加固，以及（2）建筑物挠度过大。除了解决现有建筑在结构上的地震缺陷外，大学还要求开发一种地震翻新解决方案，该解决方案是：（1）在美学上可以接受，因为它是校园中较高的建筑物之一；（2）非侵入式， （3）尽量减少内部建筑工作，（4）允许学生居住者打开视野。在考虑了几种替代改造方案后，包括增加外部和/或内部混凝土剪力墙以及外部常规钢制支撑框架后，开发了一种独特的抗震改造方案，该方案利用屈曲约束钢制支撑的单个托架与钢筋混凝土梁的组合建筑物各侧的柱形框架。支撑框架旨在作为主要的横向力抵抗系统，并由现有的力矩框架进行补充。根据两阶段基于性能的方法设计和评估了改造方案，该方法满足以下目标：（1）设计基准（475年）地震的“生命安全”性能和（2）“防塌”最大考虑地震级别（2500年）的性能。建立了三维非线性计算机模型，该模型能够捕获屈曲约束支撑，考虑后张效应的现有混凝土梁和柱以及新的混凝土梁和柱的非线性行为。通过使用七组地面运动时程记录进行时程分析，研究了翻新建筑物的抗震性能。相对于其他改造方案，屈曲约束支撑框架系统的选择为该项目提供了多个优势，其中包括：（1）提供现有窗户的局部视图；（2）与内部方案相比，拆卸所需的时间明显更少；（3）比内部解决方案更具成本效益，（4）减少了建筑物漂移，并增加了对非延性弯矩框架的要求；（5）屈曲约束的支撑架没有出现强度下降和美学上不可接受的屈曲后变形的情况。

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