- 摘 要
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(1 中國礦業(yè)大學(xué)力學(xué)與土木工程學(xué)院, 徐州 221116; 2 東南大學(xué)交通學(xué)院, 南京 211189;3 江蘇省土木工程環(huán)境災(zāi)變與結(jié)構(gòu)可靠性重點實驗室, 徐州 221116;4 江蘇建筑節(jié)能與建造技術(shù)協(xié)同創(chuàng)新中心, 徐州 221116)
摘要: 提出兩種預(yù)制底板不伸出鋼筋的新型拼縫,即階梯拼縫和弧形螺栓拼縫,并針對兩種新型拼縫和后澆帶拼縫開展了混凝土疊合板試件的靜力加載試驗. 通過試件的破壞過程和形態(tài)、應(yīng)變分布特征、荷載-撓度曲線、特征荷載值的對比,研究了后澆層厚度、拼縫附加鋼筋的配筋設(shè)置、拼縫形式對疊合板受彎性能的影響. 結(jié)果表明:兩種新型拼縫可以防止拼縫處的裂縫沿疊合面橫向發(fā)展而過早破壞;抗彎剛度和承載力隨鋼筋屈服強度的增大及后澆層厚度的增大而增大;階梯拼縫板可以達到與后澆帶拼縫板一樣的受彎性能. 結(jié)合試驗數(shù)據(jù),提出了兩種新型拼縫的配筋設(shè)計方法.
關(guān)鍵詞: 混凝土疊合板; 拼縫; 靜力試驗; 承載力
中圖分類號:TU375. 2 文獻標志碼:A 文章編號:1002-848X(2023)05-0083-07
DOI:10. 19701 / j. jzjg. 20201318
Experimental study on bending performance of concrete composite slabs using new connection joints without extended bars
XIAO Yu1,2, LI Xian1,3,4
(1 School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China;2 School of Transportion, Southeast University, Nanjing 211189, China; 3 Jiangsu Key Laboratory of EnvironmentalImpact and Structural Safety in Civil Engineering, Xuzhou 221116, China; 4 Jiangsu Collaborative Innovation Centerfor Building Energy Saving and Construction Technology, Xuzhou 221116, China)
Abstract: Two new connection joints that do not extend the reinforcement on the prefabricated slabs, namely stepped jointand arc bolt joint, were proposed, and the static loading tests of concrete composite slab specimens with two new connectionjoints and post-pouring belt joints were carried out. By the comparison of the failure process and damage states, straindistribution characteristics, load-deflection curves and characteristic load values of the specimens, the influences of thethickness of post-pouring layer, the setting of the additional reinforcement at joints and the form of the joint on the bendingperformance of composite slabs were studied. The results show that the two new connection joints avoid the early failureresult from cracks along the transverse direction at laminated face. The bending stiffness and bearing capacity increase withthe increase of yield strength of reinforcement and the thickness of post-cast layer. The slab with stepped joint can achievethe same bending performance as the slab with post-cast joint. Based on the test data, the reinforcement design methods oftwo new connection joints were proposed.
Keywords:concrete composite slab; connection joint; static test; bearing capacity
∗國家自然科學(xué)基金面上項目(51978656),江蘇建筑節(jié)能與建造技術(shù)協(xié)同創(chuàng)新中心開放基金( SJXTLX1704),徐州重點研發(fā)項目(KC19207).
第一作者:肖宇,博士研究生,主要從事結(jié)構(gòu)工程和地下工程研究,Email: 1105160506@ qq. com.
[引用本文] 肖宇,李賢. 新型不出筋拼縫混凝土疊合板受彎性能試驗研究[ J]. 建筑結(jié)構(gòu),2023,53(5):83-89.XIAO Yu,LI Xian. Experimental study on bending performance of concrete composite slabs using new connection jointswithout extended bars[J]. Building Structure,2023,53(5):83-89.
