工程科学与技术2025，Vol.57Issue(5)：52-63,12.DOI:10.12454/j.jsuese.202500050
套筒灌浆缺陷对装配式剪力墙抗震性能的影响
Effects of Grout Defects on Seismic Behavior of Precast Concrete Shear Wall
摘要
Abstract
Objective Precast concrete structure has obvious advantages such as improving production efficiency,saving energy and green environmental protection.Precast concrete shear wall is widely used in high-rise residential buildings,which plays an important role in promoting the industrial-ization of housing.The reliability of the vertical connection of precast concrete shear walls is very important to ensure the mechanical perfor-mance of the structural system.The seismic behavior of precast concrete shear wall with grout defects were analyzed.This paper study the effect of sleeve grouting defects on the seismic performance of precast concrete shear wall,and provides a reference for the performance evaluation and subsequent treatment of sleeve grouting defects. Methods Seven prefabricated concrete shear walls(six test specimens with grouting defects and one test specimen with full grouting)connected by reinforcement sleeve grouting were designed for low cycle repeated loading tests.The main designed parameters of the specimens in the tests were the number of sleeves with grouting defects and the length of grouting defects that reduced the anchorage lengths between upper reinforcements and grout.The design anchorage length of reinforcement bar and grout material was 8D(D is the nominal diameter of reinforcement bar).By setting rubber plugs of different lengths outside the upper reinforcement bar,the grout defects in the sleeve were accurately simulated.The anchorage length of upper reinforcement bar and grout material in the sleeve of specimens was 4D and 5D.The grouting defect was set in the sleeve of the edge members of shear wall.The number of sleeve joints with grouting defect is 4,8 and 12 in three cases.The design axial compression ratio of the specimens was 0.35.First,vertical pressure was applied to the top of the wall to a predetermined value,keeping the vertical pressure unchanged,and then horizontal recipro-cating force was applied to the top of the wall.The vertical pressure was provided by hydraulic jack at the top of loading beam,and horizontal force was applied by the electro-hydraulic servo actuator.The loading system of displacement control was adopted in the test.The failure process and final failure mode were observed.The hysteretic curves of horizontal force-displacement were obtained.The hysteresis loops,bearing capacity,deformation,stiff-ness degradation,ductility and energy dissipation capacity of specimens were analyzed. Results and Discussions The test results indicated that the failure mode of precast concrete shear wall with grouting defects was the same as that of the specimen with no defects.The final failure modes of walls could be characterized as the outside longitudinal reinforcements of edge mem-bers yielded even broke because of inclined sleeve,and concrete cover outside the sleeve crushed and peeled in the corner of wall.Compared with full grouting specimen,the horizontal crack of grouting defect specimen appeared slightly earlier.As the number of grouting defect sleeves in the wall in-creased,crushing height of concrete outside corner sleeve decreased gradually.The hysteretic curves of load-displacement of specimens with grouting defects look like bow or reversed S-shape,and the pinching effect of curves showed more obvious with the increase of the number of defective grout sleeves.The load-displacement skeleton curve of precast concrete shear wall with sleeve grouting defects was divided into three stages:elastic section,elastoplastic section and falling section.At the initial stage of loading,the curves of the specimens had good coincidence,and the grouting defects had little influence on the mechanical performance of the precast shear wall in elastic stage.When the skeleton curve entered the nonlinear stage,the slope of the upward section of the skeleton curve of different grouting defect specimens was different.Compared with full grouting specimen,the peak bear-ing capacity of grouting defect specimens decreased,the slope of the upward section of the skeleton curve became smaller,and tended to be flat with the increase of grouting defect sleeves.With the increase of number of sleeve grouting defects,the bearing capacity of specimens gradually decreased.The bearing capacity of specimen with all grouting defect sleeves of edge member decreased obviously,and the peak bearing capacity decreased by about 40%of full grouting specimen.The influence of different grouting defect lengths on the peak bearing capacity was not significant.Compared with full grouting specimen,the displacement at crack point,yield point and peak point of grouting defect specimens decreased more,but the displacements at failure point decreased less.With the increase of sleeve grouting defects,the displacement of feature points gradually decreased,and the more grouting defects,the worse the overall deformation performance of specimen.The ductility coefficient of all specimens was less than 3,and the ductility coeffi-cient of grouting defect specimen was larger than that of grouting full specimen.The stiffness of specimen decreased gradually with the increase of load-ing displacement.When the displacement was small,the grouting defect has little influence on the stiffness.With the increase of displacement,the stiff-ness degradation of the grouting defect specimen accelerates.The stiffness degradation of specimen with grouting defects in all the sleeves of edge members was significantly faster than that of other specimens.Compared with grouting specimen,the energy dissipation of grouting defect specimen re-duced.Before the yield displacement of specimen,the energy dissipation coefficient changed little.With the increase sleeve grouting defects,the energy dissipation of specimen decreased. Conclusions The failure mode of precast concrete shear wall with grouting defects was the same as that of specimen with no defects.The hyster-etic curves of load-displacement with grouting defects look like bow or reversed S-shape,and the pinching effect of curves showed more obvious with the increase of the number of defective grout sleeves.The bearing capacity,deformation and energy dissipation capacity reduced with the ef-fects of grout defects,while the effect of grout defects on initial stiffness was slight.The bearing capacity,peak deformation and energy dissipa-tion capacity reduced with the increase of the number of defective grout sleeves.The stiffness reduced with the increase of the number of defec-tive grout sleeves and the length of grouting defects.关键词
装配式剪力墙/套筒灌浆连接/灌浆缺陷/抗震性能/拟静力试验Key words
precast shear wall/grout sleeve splicing/grout defects/seismic behavior/quasi-static tests分类
建筑与水利引用本文复制引用
郑巍,张士前,马明磊,阴光华,陈少军..套筒灌浆缺陷对装配式剪力墙抗震性能的影响[J].工程科学与技术,2025,57(5):52-63,12.基金项目
国家重点研发计划项目(2022YFC3801400 （）
22dz1203104) （）
