预应力螺栓连接钢板约束混凝土圆柱轴压性能研究  

Study on axial compression behavior of pre⁃stressed circular concrete columns confined by bolted steel tube

作　　者：赵华[1] 徐浩 张文[2] ZHAO Hua;XU Hao;ZHANG Wen(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China;Institute of Prospecting Technology,Chinese Academy of Geological Sciences,Chengdu 611734,China)

机构地区：[1]地质灾害防治与地质环境保护国家重点实验室(成都理工大学),成都610059 [2]中国地质科学院探矿工艺研究所,成都611734

出　　处：《建筑结构》2024年第16期32-38,13,共8页Building Structure

基　　金：西藏自治区自然资源厅项目(藏财采20200890⁃1);自然资源部丘陵山地地质灾害防治重点实验室/福建省地质灾害重点实验室自主课题(KLGHZ202101)。

摘　　要：螺栓连接钢板(BST)约束混凝土圆柱,由于钢板可拆卸及更换,较钢管约束混凝土具有更好的可恢复性。以BST约束混凝土圆柱为研究对象,提出在两片拼装钢板间预留间隙,并拧紧螺栓而对其施加预压应力的方法。以施加的预压应力和径厚比为参数,对6根BST约束混凝土圆柱及1根无约束混凝土圆柱进行轴心受压试验。结果表明,预留间隙并拧紧螺栓的方法能对核心混凝土有效施加预压应力,使钢板在加载前即对核心混凝土形成有效约束。相较于无约束混凝土圆柱,同条件的施加预压应力的BST约束混凝土圆柱峰值应力最大提高74.5%,且残余强度最大能保持在峰值应力的92.3%。相较于未施加预压应力的BST约束混凝土圆柱,施加预压应力的BST约束混凝土圆柱预压应力越大,峰值应力越大,最大可提高18%;径厚比越小,BST约束混凝土圆柱峰值应力越大,但随着预压应力增大,峰值应力提高的幅度降低。Bolted steel tube(BST)confined concrete columns offer the advantage of easy disassembly and replaced of the steel plates,better recoverability than the concrete columns confined by steel tube.Taking the BST confined concrete column as the research object,the method of applying pre⁃compressive stress to it by reserving a gap between two assembled steel plates and tightening the bolts was proposed.Axial compression tests were conducted on six BST confined concrete columns and one unconfined concrete column,with parameters including the magnitude of applied pre⁃compressive stress and the diameter⁃to⁃thickness ratio.The results indicate that the method of reserving a gap and tightening the bolts can effectively apply pre⁃compressive stress to the core concrete,thereby steel plate can form effective confinement to core concrete prior to loading.Compared to unconfined concrete columns,the peak stress of BST confined concrete columns with pre⁃compressive stress under the same condition can increase by up to 74.5%,while the residual strength after the peak can be maintained at 92.3%of the peak stress.Compared to BST confined concrete columns without pre⁃compressive stress,the larger the pre⁃compressive stress of BST confined concrete columns with pre⁃compressive stress,the higher the peak stress,which can be increased by a maximum of 18%.The smaller the diameter⁃to⁃thickness ratio is,the higher the peak stress of the BST confined concrete columns is,but the magnitude of the peak stress increase decreases with the increase of the pre⁃compressive stress.

关 键 词：螺栓连接钢板 预应力 钢板约束混凝土 轴心受压试验 力学性能 

分 类 号：TU318.1[建筑科学—结构工程]