- 摘 要
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(1 上海天華建筑設(shè)計有限公司, 上海 200235; 2 同濟大學土木工程學院, 上海 200092;
3 中冶建筑研究總院有限公司, 北京 100088)
摘要: 通過進行 4 個配置高強度、高延性、低彈性模量的不銹鋼鋼筋和 2 個配置普通鋼筋的框架節(jié)點擬靜力試驗,研究了配置不銹鋼鋼筋對中間層中節(jié)點和頂層端節(jié)點的破壞形態(tài)、滯回曲線、骨架曲線、位移延性等抗震性能的影響,分別分析了軸壓比和節(jié)點構(gòu)造對兩種節(jié)點抗震性能的影響。 結(jié)果表明:不銹鋼鋼筋混凝土試件均發(fā)生梁端彎曲破壞,但塑性鉸集中在梁端較小范圍內(nèi);不銹鋼鋼筋混凝土試件的滯回曲線形狀與普通鋼筋混凝土試件相近,不銹鋼鋼筋混凝土試件的位移延性系數(shù)、最大層間位移角、極限承載力計算值與試驗值之比均和普通鋼筋混凝土試件相近;中間層中節(jié)點試件的軸壓比越大,抗震性能越低,但能有效約束節(jié)點核心區(qū)混凝土,避免剝落;采用梁面縱筋彎折至柱底與柱內(nèi)縱筋搭接并用錨固板進行錨固連接的頂層端節(jié)點區(qū),能有效保證節(jié)點的抗震性能。
關(guān)鍵詞: 不銹鋼鋼筋; 混凝土框架節(jié)點; 擬靜力試驗; 抗震性能
中圖分類號:TU317+.1, TU375?? 4 文獻標志碼:A 文章編號:1002?848X(2022)12?0049?07
DOI:10. 19701 / j. jzjg. LS220025
Experimental research on seismic performance of concrete frame joint withstainless steel reinforcement
XU Weidong1, WANG Han2, WANG Xiaofeng3
(1 Shanghai Tianhua Architecture Planning & Engineering Ltd., Shanghai 200235, China; 2 School of Civil Engineering,Tongji University, Shanghai 200092, China; 3 Central Research Institute of Building and Construction Co., Ltd.,MCC Group, Beijing 100088, China)Abstract: The quasi?static tests of four joints with high strength, high ductility and low elastic modulus stainless steelreinforcement and two joints with ordinary steel reinforcement were carried out to study the influence of stainless steelreinforcement on the seismic performance of middle layer joints and corner joints, such as failure mode, hysteretic curve,skeleton curve and displacement ductility. The influence of axial compression ratio and node formation on the seismicperformance of the two joints were analyzed. The results show that all the stainless steel specimens have bending failure atthe beam end, but the plastic hinge is concentrated in the small range of the beam end. The shape of hysteretic curve on stainless steel reinforced concrete specimens is similar to ordinary reinforced concrete specimens. The displacement ductility coefficient, the ultimate displacement angle and the ratio of the calculated value of ultimate bearing capacity to the test of specimens with stainless steel reinforcement are all similar to ordinary reinforced concrete specimens. The larger axial compression ratio, the worse seismic performance of middle layer joints, but it can restrain the concrete in the joint core area effectively and avoid spalling. The corner joints area which longitudinal reinforcement on the beam surface is bent to the bottom of the column and overlapped with the longitudinal reinforcement of the column and all the longitudinal reinforcement is anchored with anchor plate can ensure the seismic performance of the joints effectively.
Keywords:stainless steel reinforcement; joint of concrete frame; quasi?static test; seismic performance
∗國家高技術(shù)研究發(fā)展計劃基金項目(2015AA03A502)。第一作者:徐偉棟,碩士,高級工程師,一級注冊結(jié)構(gòu)工程師,主要從事混凝土結(jié)構(gòu)、裝配式建筑研究,Email: witten_shu@163.com。[引用本文] 徐偉棟,王涵,王曉鋒. 不銹鋼鋼筋混凝土框架節(jié)點抗震性能試驗研究[J]. 建筑結(jié)構(gòu),2022,52(12):49?55. XU Weidong,WANG Han,WANG Xiaofeng. Experimental research on seismic performance of concrete frame joint with stainless steel reinforcement[J]. Building Structure,2022,52(12):49?55.