Seismic Resistance of Composite Coupled Walls

WPC 2 Y B Z V#|x U^x@X@Courier 10 PitchZ N x U^x@X@2 Z快递10螺距#|x 2：F R 12-21-93 03：46p Dana Brigham Dana Brigham3‘3’标准3‘3’标准X`h p x(#%‘0*，.81 3 5@8：H？A 4 D L 3尺3寸标准版3‘3’标准3‘3’标准3‘3’标准3‘3’标准3尺3寸标准#x\P C U^X P#9319838巴拉姆·沙赫鲁兹这个项目进行了基础研究，考察了采用混合钢混凝土结构的结构的基本性能，这些结构一直处于滞后状态。在建立全面的设计规定以推进工程实践之前，需要扩大现有的知识库，特别是关于大类混合结构的抗震性能的知识库。混凝土墙或核心经常由钢梁连接，钢周边框架通常通过加强梁连接到中央混凝土核心。一个主要的问题是从钢连梁或支腿梁向墙或核心传递的力，特别是超过正常使用极限状态的力。对钢-组合梁连体混凝土墙体的基本抗震性能进行了试验和分析研究。这项研究的实验阶段包括测试代表半比例部件的六个独立连接。试件包括钢筋混凝土墙的一部分和短钢梁(无论是封闭的还是未封闭的)，模拟连梁的一半。将研究的参数包括：(A)连梁上方和下方的施工缝的影响；(B)连接区的边界单元横向配筋；(C)在连梁上增加面板以调动连接区的0*0*0*受压支柱；(D)钢连梁的尺寸设计原理，即设计为偏心支撑框架中的连梁或作为“常规受弯”构件，以便在发展塑性弯矩能力之前防止腹板屈服；(E)外包钢连梁与非外包钢连梁的性能；及。(F)防止翼缘和腹板过早屈曲的要求。该项目将为为这种耦合结构体系制定适当的设计模型和抗震准则提供基本输入。

WPC 2 Y B Z V #| x U^ x @ X @ Courier 10 Pitch z N x x x U^ x @ X @ 2 Z Courier 10 Pitch #| x 2 : F R 12-21-93 03:46p Dana Brigham Dana Brigham . 3 ' 3 ' Standard 3 ' 3 ' Standard X ` h p x (# % '0* , .81 3 5@8 : H? A 4 D L ! 3 ' 3 ' Standard 3 ' 3 ' Standard 3 ' 3 ' Standard 3 ' 3 ' Standard 3 ' 3 ' Standard 3 ' 3 ' Standard # x \ P C U^X P# 9319838 Bahram Shahrooz This project conducts basic research examining fundamental behavior of structures employing mixed steel concrete construction which has been lagging. The existing knowledge base, particularly for seismic performance of a large class of mixed constructions needs to be expanded before comprehensive design provisions can be established to advance engineering practice. Concrete walls or cores have been frequently coupled by steel beams, and steel perimeter frames are commonly attached to central concrete cores through outrigger beams. A major concern is the transfer of forces from steel coupling beams or outrigger beams into the walls or cores, particularly beyond the serviceability limit state. An experimental and analytical study of the fundamental seismic performance of concrete walls coupled through steel or composite beams is undertaken. The experimental phase of the research includes testing of six isolated connections representing half scale subassemblies. The specimens comprise a portion of a reinforced concrete wall and stub steel beams (either encased or unencased) simulating one half of a coupling beam. The parameters that will be investigated include: (a) effects of construction joints above and below coupling beams; (b) boundary element transverse reinforcement in the connection region; (c) addition of face bearing plates to the coupling beam as an effort to mobilize h) 0*0*0* compression struts in the connection region; (d) philosophies for sizing steel coupling beams, i.e. design as link beams in eccentrically braced frames or as "regular flexural" members such that web yielding will be prevented prior to development of plastic moment capacity; (e) performance of encased versus unencased steel coupling beams; and (f) requirements for preventing premature flange and web buckling. The pr oject will provide basic input for developing appropriate design model and seismic guidelines for such coupled structural systems.