隐形梁柱法加固砖砌体墙抗火性能有限元分析  

Finite Element Analysis of Fire Resistance of Brick Masonry Wall Strengthened by Invisible Beam-Column Method

作　　者：王凤池[1] 刘柯依 许树兵 WANG Fengchi;LIU Keyi;XU Shubing(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2018年第3期456-464,共9页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家十二五科技支撑计划项目(2012BAJ11B02)

摘　　要：目的为解决简易砖砌体结构抗震抗火性能差的问题,提出在砌体两面粘贴钢板,并用缀条、螺栓连接的隐形梁柱加固的方法.方法运用有限元分析软件ABAQUS分别模拟在火灾单独发生及地震次生火灾情况下,不同隐形梁柱尺寸对加固墙片在不同温度下应力分布、破坏形态、极限承载力、极限位移的影响.结果火灾单独作用下,最优加固墙片W-S-2的极限荷载较未加固墙片在200℃、400℃、800℃下分别提高143.93%、136.98%、145.46%;在200℃、400℃下极限位移分别提高78.41%、53.10%.地震次生火灾作用下,最优加固墙片W-S-1的极限荷载较未加固墙片在200℃、400℃、800℃下分别提高182.47%、170.79%、170.97%;在200℃、400℃下极限位移分别提高35.34%、10.31%.结论加固墙片较未加固墙片的整体应力有所提升且分布更均匀,各部位等效塑性应变减小,延缓了裂缝的产生;极限荷载也有不同程度的提高.隐形梁柱法能有效提高砖砌体墙的抗火性能.In order to solve the problem of poor seismic and fire resistance of simple brick masonry structure,an invisible beam-column reinforced method,which attaches steel plate on both sides of the masonry and connects the steel plate with bolts,is put forward. The finite element analysis software ABAQUS is used to simulate the influence of different size of the invisible beam and column on stress distribution,failure mode,ultimate bearing capacity and ultimate displacement of reinforced wall in the case of fire and post-earthquake fires. Under the action of fire,the ultimate load of the optimal reinforced wall sheet W-S-2 is 143. 93%,136. 98%,145. 46% higher than that of the unreinforced wall sheet under 200 ℃,400 ℃,800 ℃ respectively. The ultimate displacement at200 ℃,400 ℃,is increased by 78. 41% 、53. 10% respectively. Under the action of post-earthquake fire,the ultimate load of the optimal reinforced wall sheet W-S-2 is 182. 47% 、170. 79% 、170. 97% higher than that of the unreinforced wall sheet under 200 ℃,400 ℃,800 ℃ respectively. The ultimate displacement at 200 ℃,400 ℃,is increased by 35. 34% 、10. 31% respectively.Compared with the unreinforced wall,the integral stress of the strengthened wall is increased and distributed more evenly,the equivalent plastic strain of each part is reduced,and the occurrence of the crack has been delayed. The ultimate load of the strengthened wall is higher than that of the unstrengthened wall. The invisible beam-column method can effectively improve the fire resistance of brick masonry walls.

关 键 词：隐形梁柱法 加固 砌体结构 有限元分析 

分 类 号：TU362[建筑科学—结构工程]