现浇丁字形交叉管廊纵向抗震分析

Longitudinal Seismic Analysis of Cast-in-Place T-Type Cross Utility Tunnel

摘要

基于纵向反应位移法原理,结合正弦地层位移全态输入方法,采用现浇丁字形交叉管廊的壳-弹簧有限元模型,系统研究了交叉管廊在不同地震动幅值和不同入射角作用下的内力、变形及损伤响应,讨论了管廊的最不利内力和最不利变形模式,并与文献中预制丁字形交叉管廊的响应进行了比较．研究表明：在中震作用下,当地震波入射角为45°时,管廊截面轴力达到峰值,为最不利轴力模式,当地震波入射角为90°时,管廊截面剪力及截面弯矩均达到峰值,为最不利剪力及弯矩模式；在大震作用下,当地震波入射角为45°时,变形缝的张开量和压缩量分别可达24.17 mm 和29.80 mm,为管廊的最不利变形模式；在大震作用下,管廊结构的受拉损伤分布区域随着入射角的增大发生明显变化,地震波入射角为45°时管廊整体损伤程度最大,远远超过受拉损伤限值；现浇丁字形交叉管廊和预制丁字形交叉管廊在内力、变形方面均存在明显差别,这一明显差异主要归因于管廊管节间连接方式及刚度的不同,现浇管廊标准段整体刚度相较于变形缝处明显要大,导致现浇交叉管廊的峰值内力响应主要出现在标准段处,峰值变形响应主要出现在变形缝处．本文研究结论可为现浇丁字形交叉管廊的抗震设计提供一定参考．

Abstract

Based on the principle of the longitudinal response-displacement method and combined with the full-state input method with sinusoidal stratum displacement,a shell-spring finite element model of a cast-in-place T-type cross utility tunnel was used to systematically study the internal force,deformation and damage response of the utility tunnel under different seismic motion amplitudes and incident angles,with a focus on the most unfavorable internal force and deformation modes of the utility tunnel. In addition,a comparison was made between cast-in-place T-type cross utility tunnels and prefabricated T-type cross utility tunnels in the literature. Results indicate that under the moderate earthquake,when the incident angle of seismic waves is 45°,the axial force at the utility tunnel section reaches its peak value,forming the most unfavorable axial force mode. When the incident angle of seismic waves is 90°,both the shear force and bending moment reach their peak values,forming the most unfavorable shear and moment modes. Under the major earthquake,at an incident angle of 45°,the joint opening and compressive deformations can be up to 24.17 mm and 29.80 mm,respectively,representing the most unfavorable deformation mode. The distribution zones of tensile damage in the utility tunnel under the major earthquake vary significantly as the incident angle increases. The overall damage of the utility tunnel reaches its maximum at an incident angle of 45°,far exceeding the tensile damage threshold. It is indicated that there are significant differences between cast-in-place T-type cross utility tunnels and prefabricated T-type cross utility tunnels in terms of internal force and deformation,which are mainly attributed to the differences in connection modes and stiffness between tunnel segments. The overall stiffness of standard segments of the cast-in-place utility tunnel is significantly higher than that at the deformation joint. Consequently,the peak internal force response mainly occurs at the standard segments,while the peak deformation response mainly appears at the deformation joints. The findings in this paper may provide a reference for the seismic design of cast-in-place T-type cross utility tunnels.

关键词

现浇管廊 / 丁字形交叉管廊 / 变形缝 / 纵向抗震分析 / 最不利模式 / 损伤

Key words

cast-in-place utility tunnel / T-type cross utility tunnel / deformation joint / longitudinal seismic analysis / most unfavorable mode / damage

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基金资助

国家自然科学基金资助项目(51978462)