連梁式多層鋼板剪力牆耐震行為研究

Seismic Responses of Multi Story Coupled Steel Plate Shear Wall System

張景棠(Jing-Tang Chang)

指導教授 ： 蔡克銓

國立臺灣大學/工學院/土木工程學研究所/碩士(2009年)

https://doi.org/10.6342/NTU.2009.01848

摘要

鋼板剪力牆系統近年來逐漸受到重視，使用此系統之建築案例日益增加。鋼板剪力牆系統中，須選用尺寸足夠的邊界束制構件，本研究承接過去鋼板剪力牆系統在耐震設計上的研究成果，提出放寬柱容量設計需求之方法。並在兩道鋼板剪力牆之間，用連梁固接的方式，使兩道鋼板剪力牆一起作用，共同抵抗地震側力，如此不但可以有較高的強度，還可使內柱軸力需求降低。其中連梁亦可使用剪力連桿的設計方式，以提供穩定的耐震消能機制。
本研究探討連梁式鋼板剪力牆的設計細節，與允許柱底塑角產生在距離柱底四分之一樓高處，以放寬柱容量設計需求的方法。以台灣及美國現行耐震設計法規為本，設計6層樓連梁式鋼板剪力牆原型結構。並建立結構模型進行一連串的有限元素法彈性與塑性分析，亦以工程應用之角度，思考連梁式鋼板剪力牆系統之耐震設計流程。用結構分析方式探討耐震設計流程與結構耐震行為。
除了探討設計流程外，本研究亦將設計之原型結構進行子結構實驗，以驗證擬建議之設計方法。此實驗利用國家地震中心MATS設施，使用多自由度的控制方法，對此原型結構的1與2樓0.4比例縮尺的子結構進行反復載重試驗，其中垂直方向採用固定之力量控制，水平方向採用位移控制，另由水平方向剪力反應即時運算後，施加高層傳遞至之傾倒力矩。
由理論分析與實驗結果，可有以下幾點較重要之結論：
1. 試驗結果發現，允許柱底塑角產生在距離柱底四分之一樓高處之設計，使試體在樓層側位移角達2%弧度前，試體耐震性能良好。而在更大樓層側位移角之下，試體發生柱內縮現象，但其變形量亦屬可接受範圍。
2. 兩道鋼板剪力牆之間以剪力連梁相連，連梁確能提供穩定之消能行為，而在樓層側位移角5%弧度時，其剪變形約為4%弧度。
3. 試驗所採用之控制方法達即時運算，成功施加穩定之傾倒力矩。

關鍵字

鋼板剪力牆 ； 連梁式鋼板剪力牆 ； 剪力連桿 ； 容量設計法 ； MATS

並列摘要

In recent years, the steel plate shear wall system has gradually gained recognition and acceptance. Both research and construction involving this system has increased. In the steel plate shear wall system, the designer must choose strong boundary elements for the tension field. The purpose of this research is to investigate the effectiveness of a reduced column capacity design requirement by allowing the plastic hinge to form at approximately one quarter column high above the column base. Moreover, this research adopts the moment connection details for the link beam between the two steel plate shear wall systems, know as a coupled steel plate shear wall (C-SPSW). In this system, two steel plate shear walls can work together to resist the lateral force. Therefore, the C-SPSW system will not only have higher stiffness, strength and greater energy dissipation ability, but will also reduce the axial force in the internal columns.
In this research, the author followed the current Taiwan and AISC seismic steel building code to design a six-story prototype building to study the flowing two topics: the capacity design procedure of a coupled steel plate shear wall system, and the effects of the relaxed column capacity. Extensive finite elements analysis has been conducted to analyze the building’s elastic and inelastic responses.
This research also includes a cyclic test of a reduced scale, sub-structure of the prototype C-SPSW at NCREE using the Multi-axial Testing System (MATS) facility, applying constant force control in the vertical direction, cyclic displacement control in the horizontal direction. Assuming the building’s lateral force distribution is like an inverted triangle, the overturning moment from the third story was computed on line from the horizontal actuator force feedback. The cyclic overturning moments were satisfactorily applied using MATS controller.
From this research, the following conclusions can be drawn:
1. The test results confirm that by allowing the plastic hinge to form at 1/4 high above the column base, the size of the column can be reduced. Before the overall story drift reached 0.02 radian, the C-SPSW specimen performed very well. When the overall story drift reached 0.05 radian, the inward deformations of the two columns became evident, but the lateral force resisting performance of the C-SPSW specimen remained satisfactory.
2. The shear link beam design for the C-SPSW specimen is found effective. The 2nd-story shear link deformations reached 0.04 radian when the overall story drift reached 0.05 radian.
3. The MATS controller allows the constant axial loads, cyclically increasing lateral displacements, and the corresponding overturning moments successfully applied on the C-SPSW substructure specimen.

並列關鍵字

steel plate shear wall ； coupled steel plate shear wall ； shear link ； capacity design ； MATS

參考文獻

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