- 摘 要
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（1 清華大學(xué)建筑設(shè)計研究院有限公司， 北京 100084;2 清華大學(xué) 土木工程安全與耐久教育部重點實驗室， 北京 100084）
［摘要］進行了4個大尺寸鋼筋混凝土T形墻試件（TSW1～TSW4）在恒定軸壓力和平行于腹板方向的往復(fù)水平力作用下的擬靜力試驗，對比分析約束邊緣構(gòu)件的不同設(shè)計方法，研究T形墻抗震性能。所有試件剪跨比均為2.5，設(shè)計軸壓比均為0.4。結(jié)果表明，所有T形墻試件均發(fā)生腹板自由端部混凝土壓潰的壓彎破壞，而翼緣損傷輕微；規(guī)程JGJ 3—2010正截面承載力計算方法和XTRACT截面分析均能準(zhǔn)確計算T形墻的壓彎承載力；按規(guī)范GB 50011—2010設(shè)計的試件TSW1在位移角超過1%后，腹板自由端受壓方向承載力迅速下降，延性差；僅增加腹板自由端約束邊緣構(gòu)件的長度（即試件TSW3），不能顯著改善T形墻延性；按照改進方法設(shè)計邊緣構(gòu)件的試件TSW4的延性和抗震性能顯著提高，變形能力與按美國規(guī)范ACI 318-14設(shè)計的試件TSW2相近，極限位移角均超過2%。最后根據(jù)試驗分析，提出了T形墻約束邊緣構(gòu)件的設(shè)計建議。
［關(guān)鍵詞］T形墻； 抗震性能； 約束邊緣構(gòu)件長度； 配箍特征值； 延性； 擬靜力試驗
中圖分類號：TU375文獻標(biāo)識碼：A文章編號：1002-848X(2020)12-0108-08
Experimental study on design methods of special boundary elements of T-shaped RC walls
JIANG Zao1, JI Xiaodong2, WANG Shuo2, XU Mengchao2, HE Xiaogang1
(1 Architecture Design and Research Institute of Tsinghua University Co., Ltd., Beijing 100084， China; 2 Key Laboratory of Civil Engineering Safety and Durability of China Ministry of Education, Tsinghua University, Beijing 100084, China)
Abstract:Quasi-static tests were conducted on four large-scale T-shaped reinforced concrete (RC) wall specimens（TSW1～TSW4） subjected to axial compressive force and lateral cyclic loading parallel to the wall web. Various design methods on the special boundary elements of T-shaped walls were compared, and the seismic behavior of T-shaped walls was investigated. All specimens had a shear-to-span ratio of 2.5, and designed axial force ratio of 0.4. The results show that all specimens failed in flexural mode, characterized by crushing of concrete at the free end of wall web， and only slight damage occurred at the flange end. Both the flexural strength calculation method specified in JGJ 3—2010 and XTRACT cross-sectional analysis provide accurate estimates of flexural strength of the wall specimens. Specimen TSW1 that was designed per the GB 50011—2010 provisions showed inadequate ductility with sudden strength drop after 1% drift in the flange-in-tension loading direction. Specimen TSW3 in which only the extent of special boundary element at the free end of the web was increased did not show higher ductility relative to specimen TSW1. Specimen TSW4 designed by an improved method, exhibited improved seismic performance and ductility, and had similar deformation capacity as specimen TSW2 designed by American specification ACI 318-14, with the ultimate drift larger than 2%. Based on the experimental tests and analysis, the recommendations were proposed for design of the special boundary elements of T-shaped walls.
Keywords:T-shaped wall; seismic behavior; extent of special boundary element; characteristic value of transverse reinforcement; ductility; quasi-static test
*北京市自然科學(xué)基金杰出青年科學(xué)基金項目（JQ18029），國家自然科學(xué)基金國際（地區(qū)）合作與交流項目（51811540032）。
通訊作者：紀曉東，博士，副教授，博士生導(dǎo)師，Email:jixd@mail.tsinghua.edu.cn。
