- 摘 要
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(1 大連民族學(xué)院土建系，大連 116622； 2 大連理工大學(xué)海岸及近海工程國家重點(diǎn)實(shí)驗(yàn)室，大連 116024； 3 日本京都大學(xué)土建系，京都 606-8501)
［摘要］對鋼筋混凝土框架頂層L形邊節(jié)點(diǎn)及T形中節(jié)點(diǎn)的抗震性能進(jìn)行了試驗(yàn)研究。根據(jù)節(jié)點(diǎn)裂縫特征、荷載-變形滯回曲線、梁柱縱筋應(yīng)變曲線及節(jié)點(diǎn)核心區(qū)周圍諸力分布特點(diǎn)等試驗(yàn)結(jié)果，分析了節(jié)點(diǎn)的各種破壞模式及不同破壞模式對節(jié)點(diǎn)強(qiáng)度的影響。比較了中日兩國規(guī)范節(jié)點(diǎn)強(qiáng)度設(shè)計(jì)值與試驗(yàn)結(jié)果的吻合性。結(jié)果表明：在滿足節(jié)點(diǎn)內(nèi)構(gòu)件縱筋錨固充分的前提下，L形節(jié)點(diǎn)在梁柱相對關(guān)閉方向的傳力機(jī)構(gòu)為扇形斜壓桿機(jī)構(gòu)，難以被“剪壓”壞，節(jié)點(diǎn)抗剪強(qiáng)度在混凝土圓柱體抗壓強(qiáng)度的0.2倍以上；張開方向的節(jié)點(diǎn)強(qiáng)度由受彎傳力機(jī)構(gòu)決定，節(jié)點(diǎn)強(qiáng)度為關(guān)閉方向的0.7倍左右。T形節(jié)點(diǎn)的抗剪強(qiáng)度在混凝土圓柱體抗壓強(qiáng)度的0.2倍左右，梁筋在節(jié)點(diǎn)內(nèi)粘結(jié)性能的顯著衰減使節(jié)點(diǎn)強(qiáng)度低于├形中間層邊節(jié)點(diǎn)。
［關(guān)鍵詞］框架頂層節(jié)點(diǎn)；破壞形式；抗剪強(qiáng)度；抗彎強(qiáng)度；粘結(jié)衰減
Experimental study on seismic performance of reinforced concrete joints on frame top story
Cui Jianyu1，Sun Jiangang1，Song Yupu2，Watanabe Fumio3(1 Department of Civil Engineering, Dalian Nationalities University, Dalian 116622, China;2 State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology, Dalian 116024, China;3 Department of Civil Engineering, Kyoto University, Kyoto 606-8501, Japan)
Abstract:The experimental study on seismic performance of reinforced concrete L-shaped and T-shaped joints on frame top story was carried out. Various failure modes of joints and the influence of different failure modes on joint strength were analyzed based on the test results such as crack patterns of joints, load-displacement hysteresis loops, strain curves of beam bars and column bars. Anastomosis of test results and design values calculated by China code and Japan code on joint strength was compared. The results showed that when having enough anchorage of structure component bars passing through joints, force resisting mechanism of L-shaped joint subject to loading in closing direction is sector and hard to fail in due to shear compression, the joint shear strength is larger than 0.2 times of concrete cylinder compressive strength, and the joint strength in opening direction is governed by moment resisting mechanism, the joint strength is 0.7 times of that in closing direction. The shear strength of T-shaped interior joint is about 0.2 times of concrete cylinder compressive strength, and the joint strength is smaller than that of ├shaped exterior joints due to the significant bond deterioration of beam bars passing through joints.
Keywords:joints on frame top story; failure modes; shear strength; bending strength; bond deterioration
作者簡介：崔建宇，日本京都大學(xué)博士，副教授，Email:jianyucui2005@yahoo.com.cn。
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