摘要
提出了丁字及十字交叉管廊纵向地震响应分析的一个改进广义反应位移法.该方法采用壳单元模拟管廊结构,以体现管廊横断面非对称形式的影响和地震作用下管廊交叉节点处的局部变形;采用非线性弹簧单元模拟预制企口接头,可反映管廊接头断面的非对称形式以及预制接头的力学行为.在ABAQUS有限元平台构建了典型交叉管廊的三维壳-弹簧计算模型,采用直接刚度法求解场地地震动响应,研究了在设计地震动幅值和地震波入射角度等因素影响下,丁字及十字交叉管廊的内力及变形响应特征,并以直线形管廊的地震响应为基准,给出了两类交叉节点的影响范围及内力放大情况.结果表明,相较于直线形管廊,管廊交叉节点处的内力及变形响应均出现明显的增高,其中丁字交叉管廊的地震响应略大于十字交叉管廊.安评波小震作用下,丁字及十字交叉管廊的接头基本处于功能完好状态,中震和大震作用下超出规范限值,其中大震下达到8 mm左右,约为直线形管廊的8~9倍;两类交叉管廊的内力放大系数范围约为2~6.工程抗震设计中,可根据该结果对交叉管廊的地震响应进行初步评估.不同设计地震动幅值和地震波入射角度下,两类交叉节点对管廊地震响应的影响范围约为20~35倍预制管节段长度,在实际工程中应引起重视.相关研究结果可为交叉管廊工程的抗震设计提供参考.
An improved generalized response deformation method was proposed in this paper to analyze the longitudinal seismic response of T-type and cross-type crossing utility tunnels,in which the shell element was used to simulate the utility tunnel structure to reflect the influence of the asymmetric form of cross-section as well as the local deformation at the intersection,and nonlinear spring elements were used to simulate prefabricated joints to reflect the asymmetric form of cross-section of utility tunnels and the mechanical behavior of prefabricated joints.Threedimensional shell-spring calculation models of typical crossing utility tunnels were established on the ABAQUS finite element platform.The direct stiffness method was used to solve the ground seismic response,and the internal force and deformation response characteristics of T-type and cross-type crossing utility tunnels under the influences of factors such as design ground motion amplitude and seismic wave incidence angle were studied.Based on the seismic response of a linear utility tunnel,the influencing range and internal force amplification for the two types of intersections were also given.Results show that the internal force and deformation response of utility tunnels at the T-type or cross-type intersections were significantly larger than those of the linear utility tunnel,and the seismic response of the T-type utility tunnel was slightly larger than that of the cross-type utility tunnel.The deformation at the intersections of T-type and cross-type utility tunnels did not exceed the standard limit value under minor earthquake,while those under medium and major earthquakes exceeded the standard limit value.Specifically,the deformation at the joints reached 8 mm under major earthquake,which was about 8—9 times that of the linear utility tunnel.Meanwhile,the amplification coefficient for the internal force of the two types of crossing utility tunnels was basically between 2 and 6.In the engineering seismic design,a preliminary evaluation on the seismic response of crossing utility tunnels can be conducted accordingly.In addition,the influencing ranges of the two types of intersections for the seismic response of tunnels were about 20—35 times the length of precast segment under different design ground motion amplitudes and seismic wave incidence angles,indicating that necessary attention should be paid to this aspect in practical engineering.The results of this paper may provide a reference for the seismic design of crossing utility tunnels.
作者
李东桥
严晓威
梁建文
赵华
Li Dongqiao;Yan Xiaowei;Liang Jianwen;Zhao Hua(School of Civil Engineering,Tianjin University,Tianjin 300350,China;Tianjin Architecture Design Institute,Tianjin 300074,China)
出处
《天津大学学报（自然科学与工程技术版）》
EI
CAS
CSCD
北大核心
2024年第1期21-30,共10页
Journal of Tianjin University：Science and Technology
基金
国家自然科学基金资助项目(51978462).
关键词
交叉管廊
预制管廊
纵向地震响应分析
改进广义反应位移法
crossing utility tunnel
precast utility tunnel
longitudinal seismic analysis
improved generalized response deformation method
