爆炸荷载作用下型钢混凝土柱的动力响应影响因素分析  

Influencing Factor Analysis on Dynamic Response of Steel Reinforced Concrete Column under Blast Loading

作　　者：齐宝欣[1] 阎石[1,2] 张文新 武行 QI Baoxin;YAN Shi;ZHANG Wenxin;WU Xing(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168;.State Key Laboratory of Explosion Science and Technology,Beijing,China,100081)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]爆炸科学与技术国家重点实验室,北京100081

出　　处：《沈阳建筑大学学报（自然科学版）》2018年第2期202-210,共9页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51278313);住房和城乡建设部科技攻关项目(2015-K2-018);爆炸科学与技术国家重点实验室项目(KFJ10-14M);辽宁省教育厅项目(L2015448);江苏省土木工程环境灾变与结构可靠性重点实验室开放基金项目(JSKL2014K10);沈阳市科学技术计划项目(17-231-1-89)

摘　　要：目的数值模拟爆炸荷载作用下型钢混凝土柱损伤破坏,分析凝土等级、型钢截面形式、纵筋配筋率、柱高等因素对型钢混凝土柱在爆炸荷载作用下动态响应的影响规律.方法采用有限元显示动力分析软件ANSYS/LS-DYNA,建立型钢混凝土柱的三维有限元模型,在进行型钢混凝土柱的动态响应分析时,对型钢混凝土柱各材料间共线共结点方式建模,并考虑型钢与混凝土之间的摩擦接触.通过比较相同荷载幅值条件下,爆炸与静力作用下的应力分布的异同来说明爆炸作用下应力的分布特点.结果提高型钢强度和纵向受力钢筋配筋率对型钢混凝土柱抗爆性能的提高并没有显著效果;相同最大荷载值的静载与爆炸荷载两种情况下,爆炸荷载下的破坏能力较强,破坏程度较大.结论采用高强度混凝土,选用截面惯性矩较大的型钢,以及选用截面和高度尺寸适宜的型钢混凝土柱有利于提高型钢混凝土柱的抗爆性能;细长柱的抗爆性能较弱,实际工程中尽量避免选用.Finite element analysis(FEA)software ANSYS/LS-DYNA was used to establish a three dimensional finite element model of the steel reinforced concrete column and analyze the influence factors of the damage and failure of the steel reinforced concrete(SRC)column.The collinear and common nodes will be used between the materials of steel reinforced concrete column during the FEA,considering the friction contact between steel and concrete.The influence of the concrete strength grade and the section form of steel cross section was numerically analyzed.By comparing the blast and static load under the same load amplitude,the cross-sectional distribution characteristic of stress under the blast loading was explained.The results showed that using higher strength concrete,larger section moment of inertia of steel and suitable size of column section and height will improve the blast resistance properties of SRC columns.In practical engineering,it is suggested to avoid using slender column because of the weak blast resistance properties.In some reinforcement rate interval,there is no significant effect on blast resistance properties of steel reinforced concrete columns by increasing the longitudinal reinforcement ratio of the column.Under the blast or static load under with the same load amplitude,the force of the blast loading is stronger,resulting in relatively large damage.

关 键 词：型钢混凝土柱 爆炸荷载 数值模拟 动力响应 截面惯性矩 

分 类 号：TU391[建筑科学—结构工程]