【摘要】：為改善已有灌漿套筒施工的便利性,提出了一種新型套筒約束漿錨搭接接頭,研究了該接頭的力學性能.進行了不同搭接長度下16個該搭接接頭的拉伸試驗,研究了接頭的破壞形態(tài)、力-位移曲線、承載力、延性、鋼筋應變、套筒環(huán)向應變等,并基于試驗數(shù)據(jù)及平截面假定對套筒截面的內(nèi)力進行分析,解釋了隨搭接長度變化套筒環(huán)向(拉、壓)應變的變化過程.由于套筒的約束,接頭的搭接長度大大減小;試驗中套筒的偏轉(zhuǎn)導致試件的剛度、延性小于對應鋼筋的剛度、延性;搭接接頭套筒中部拉力比對接接頭小,對套筒材料抗拉性能要求低,搭接接頭鋼筋通過灌漿料傳遞到套筒上的剪應力比對接接頭小,對套筒與灌漿料的界面粘結(jié)性能要求低.當套筒長度短時,鋼筋與灌漿料間出現(xiàn)滑移,使得套筒中部鋼筋的拉力變大,套筒與灌漿料合力為壓力,反之,套筒與灌漿料合力為拉力;隨著搭接長度的增加,加載過程中套筒中部近鋼筋側(cè)環(huán)向最大壓應變增大;極限荷載時,隨著搭接長度增加,套筒各測點環(huán)向拉應變總體呈降低的趨勢.
[Abstract]:In order to improve the convenience of existing grouting sleeve construction, a new type of jacketed grouting anchor lapping joint is proposed, and the mechanical properties of the joint are studied. The tensile tests of 16 lap joints with different lapping lengths were carried out, and the failure mode, force displacement curve, bearing capacity, ductility, reinforcement strain, annular strain of sleeve, etc., were studied. Based on the experimental data and the assumption of plane section, the internal force of the sleeve section is analyzed, and the variation process of the circumferential (tensile, compressive) strain of the sleeve with the length of the lap joint is explained. Because of the constraint of the sleeve, the length of lap joint is greatly reduced; the deflection of the sleeve in the test results in the stiffness of the specimen, the ductility is less than that of the corresponding steel bar, and the tensile force in the middle of the sleeve of the lap joint is smaller than that of the butt joint. The tensile property of the sleeve material is low, the shear stress of the steel bar of the lap joint is smaller than that of the butt joint, and the interfacial bond property between the sleeve and the grouting material is lower than that of the butt joint. When the length of sleeve is short, slippage appears between steel bar and grouting material, which makes the tensile force of steel bar in the middle of sleeve become larger, and the resultant force of sleeve and grouting material is pressure, conversely, the resultant force of sleeve and grouting material is tension force; with the increase of lap length, In the process of loading, the maximum compressive strain of the central part of the sleeve near the side of the reinforcing bar increases, and under the limit load, with the increase of the length of the lap joint, the total circumferential tensile strain of each measuring point of the sleeve tends to decrease.
【作者單位】： 同濟大學結(jié)構(gòu)工程與防災研究所;
【基金】：國家自然科學基金資助項目(51322803)~~
【分類號】：TU758.12

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本文編號：2230146