复合配筋混凝土预制方桩型钢插接焊接复合接头受剪和受弯性能试验研究  

Experimental study on shear and flexural performance of section steel plug-in welding composite joint for composite reinforcement concrete prefabricated square piles

作　　者：徐铨彪[1,2] 薛超悦 陈刚 张旭伟[3] 龚顺风 XU Quanbiao;XUE Chaoyue;CHEN Gang;ZHANG Xuwei;GONG Shunfeng(Center for Balance Architecture,Zhejiang University,Hangzhou 310028,China;Architectural Design&Research Institute of Zhejiang University Co.,Ltd,Hangzhou 310028,China;Department of Civil Engineering,Zhejiang University,Hangzhou 310058,Chin)

机构地区：[1]浙江大学平衡建筑研究中心,浙江杭州310028 [2]浙江大学建筑设计研究院有限公司,浙江杭州310028 [3]浙江大学土木工程学系,浙江杭州310058

出　　处：《建筑结构学报》2024年第12期236-245,共10页Journal of Building Structures

基　　金：国家自然科学基金项目(52071290);浙江省重点研发计划(2018C03033-1)。

摘　　要：为提高混凝土预制桩的连接性能,研发了一种混凝土预制方桩型钢插接焊接的复合连接接头。通过对截面边长为300、450、600 mm的13个复合配筋混凝土预制方桩复合接头和桩身分别进行受剪和受弯性能试验,对比研究型钢插接焊接复合接头和桩身的受剪承载力、受弯承载力、变形能力及破坏特征。结果表明:桩身受剪破坏形态为弯剪段斜截面剪切破坏,接头受剪破坏形态为弯剪段斜截面剪切破坏和接头处钢棒墩头被拉脱;桩身受弯破坏形态主要为截面受拉区钢棒被拉断,接头受弯破坏形态主要为接头处钢棒墩头被拉脱;受剪试件纯弯段竖向裂缝较多,弯剪段出现腹剪斜裂缝;受弯桩身竖向裂缝较多且分布均匀,有分叉现象;截面边长为300 mm和450 mm方桩接头的受剪、受弯承载力和变形能力与桩身的相近,截面边长为600 mm方桩接头在接头处端板增设锚固筋可以有效提高接头的受弯承载力和变形能力。A composite connection joint for section steel plug-in welding of concrete prefabricated piles was designed to improve the connection performance of concrete prefabricated piles.The shear and flexural experiments of thirteen composite joints and pile bodies of composite reinforcement concrete prefabricated square piles with section side lengths of 300mm,450mm and 600mm were conducted to compare the shear and flexural bearing capacities,deformation capacity and failure characteristics of the section steel plug-in welding composite joints and pile bodies.The results show that the shear failure mode for the pile bodies is the oblique section shear failure in the flexural shear section,and for the joints is the oblique section shear failure in the flexural shear section and the steel bar pier heads being pulling off at the joint.The main flexural failure mode for the pile bodies is the tensile fracture of the steel bars in the tensile zone of the section,and for the joints is the steel bar pier heads being pulled off at the joint.For the shear specimens,many vertical cracks are observed in the pure flexural section,along with an obvious oblique abdominal shear crack in the flexural shear section.While for the flexural specimens,the vertical cracks in the pile bodies are numerous and evenly distributed,with bifurcation phenomena.The shear and flexural bearing capacities,and deformation capacity of 300mm and 450mm square pile joints are close to those of the pile bodies.For the 600 mm square pile joint,adding anchoring rebars to the end plate at the joint can effectively enhance the flexural bearing capacity and deformation capacity of the joint.

关 键 词：混凝土预制方桩 复合配筋 型钢插接焊接复合接头 单调加载试验 受剪性能 受弯性能 

分 类 号：TU473.13[建筑科学—结构工程] TU317.1[建筑科学—土工工程]