冲击荷载下圆孔蜂窝梁动力响应及孔间腹板屈曲研究  

Study on dynamic responses and buckling of web-post of castellated beam with circular web openings under impact load

作　　者：罗才松[1,2] 王枫轩 付朝江 陈华艳[1] 陈国灿[2] LUO Caisong;WANG Fengxuan;FU Chaojiang;CHEN Huayan;CHEN Guocan(Fujian Provincial Key Laboratory of Advanced Technology and Informatization in Civil Engineering,Fujian University of Technology,Fuzhou 350118,China;Fujian University Engineering Research Center for Disaster Prevention and Mitigation of Southeast Coastal Engineering Structure,Putian 351100,China)

机构地区：[1]福建工程学院福建省土木工程新技术与信息化重点实验室,福建福州350118 [2]东南沿海工程结构防灾减灾福建省高校工程研究中心,福建莆田351100

出　　处：《建筑结构学报》2023年第1期132-142,共11页Journal of Building Structures

基　　金：国家自然科学基金项目(51378124);福建省自然科学基金项目(2020J01885);东南沿海工程结构防灾减灾福建省高校工程研究中心基金(2019001);校基金(GY-Z160134)。

摘　　要：为了研究圆孔蜂窝梁在非常规荷载作用下的动力响应,对9根圆孔蜂窝梁进行落锤冲击试验,探究冲击速度、冲击质量、孔间距、孔高等4个参数对其动力响应和孔间腹板屈曲的影响。试验过程中采集锤头冲击力、梁的位移和加速度以及圆孔周围的应变,并通过高速摄像机拍摄冲击过程。试验结果表明:冲击持续时间随着冲击速度和质量的增加而增加;梁的位移响应受与冲击区域的距离、冲击能量、孔间距和孔高的影响;梁的平均能量吸收率为57.63%,并随着孔间距的增大而减小,随着孔高的增大而增加;加速度沿梁跨中到支座呈“两折线”衰减;冲击作用位置处圆孔的投影面积减小率与冲击能量表现为近似指数增长的趋势;随着冲击能量的增大,跨中孔间腹板发生侧向凸曲的程度加剧;随着孔间距的减小和孔高的增加,非跨中孔间腹板的屈曲程度加剧。In order to reveal the dynamic response of castellated beams with circular web openings under abnormal loading, nine specimens were subjected to drop hammer impact tests to investigate the effects of impact velocity, impact quality, spacing between web openings, and height of openings on the dynamic responses and web-post buckling behavior. During the test, the impact force of the hammerhead, the displacements and accelerations of the beam, and strain developments around the circular web opening were collected, while the impact process was recorded by a high-speed camera. The experimental results show that the impact duration increased with the increase of impact velocity and mass. The displacement responses of the beam were affected by the distance from the impact area, impact energy, spacing between web openings and height of openings. The average energy absorption rate of the beam was 57.63%, but decreased with the increase of spacing between web openings and increased with the increase of height of openings. The acceleration distribution along the beam from the mid-span to the supports presented an attenuation of two-fold pattern. The relationship between the reduction ratio of the projective area of the circular web opening and the impact energy demonstrated an exponentially increasing trend at the impact position. With the increase of impact energy, the deformation of lateral convexity in the middle region of the mid-span web-post increased. With the decrease of spacing between web openings and the increase of height of openings, the buckling deformation of web-post away from the mid-span increased.

关 键 词：蜂窝梁 冲击 动力响应 能量吸收 孔间腹板屈曲 

分 类 号：TU392.1[建筑科学—结构工程] TU317.1