为研究悬索桥隧道式锚碇在三维地震波作用下最不利入射方向,本文通过改变地震波水平分量入射角得到了锚塞体前后锚面及锚-岩接触面岩体的位移响应,之后利用屈服接近度准则对锚岩接触面屈服状态进行判别,得到了隧道锚在三维地震波作用下最不利入射方向。结果表明:当地震波水平入射角与悬索桥纵轴向方向相同或垂直时,前后锚面及锚岩接触面位移响应取得极大值,且前锚面位移响应大于后锚面位移响应,拱顶位移响应大于底板位移响应,锚岩接触面位移响应呈现出由前锚面至后锚面逐渐减小的趋势;当地震波水平入射角与悬索桥纵轴向方向相同或垂直时,锚岩接触面处测点屈服接近度取得极小值,此时锚岩接触面周围围岩未进入塑性屈服状态。本文成果可为悬索桥隧道式锚碇在地震作用下的设计提供参考。
To investigate the most unfavorable incident direction of tunnel-type anchorage in suspension bridges under the influence of three-dimensional seismic waves, this study obtained the displacement response of the anchor body's front and rear anchor surfaces and the anchor-rock contact surface by altering the incident angle of the seismic wave's horizontal component. Subsequently, the yield proximity criterion was employed to assess the yielding state of the anchor-rock contact surface, determining the most unfavorable incident direction for tunnel anchors under the influence of three-dimensional seismic waves. The research indicates that when the horizontal incident angle of the seismic wave is parallel or perpendicular to the longitudinal direction of the suspension bridge, the displacement response of the front and rear anchor surfaces and the anchor-rock contact surface reaches its maximum value. Moreover, the displacement response of the front anchor surface is greater than that of the rear anchor surface, the displacement response of the arch crown is greater than that of the bottom plate, and the displacement response of the anchor-rock contact surface exhibits a gradually decreasing trend from the front anchor surface to the rear anchor surface. When the horizontal incident angle of the seismic wave is parallel or perpendicular to the longitudinal direction of the suspension bridge, the yield proximity of the measuring points at the anchor-rock contact surface attains its minimum value. At this time, the surrounding rock mass around the anchor-rock contact surface has not entered the plastic yielding state, providing a reference for the design of tunnel-type anchorage in suspension bridges under seismic action.
[1] 李明, 袁晓伟, 陈奇, 等. 隧道式锚碇动张拉荷载响应分析[J]. 重庆交通大学学报(自然科学版), 2015, 34(2): 24-27,49.
[2] 颜冠峰, 王明年, 范宇, 等. 地震波作用下悬索桥隧道锚力学响应研究[J]. 地下空间与工程学报, 2019, 15(增2): 590-597.
[3] 陈奇. 基于动力非线性的隧道式锚碇力学响应分析[D].重庆: 重庆交通大学土木工程学院, 2014.
[4] 杨济舟. 地震荷载作用下悬索桥隧道式锚碇边坡稳定性分析[D]. 成都: 西南交通大学, 2017.
[5] 焦长洲. 地震作用下隧道式复合锚碇动力响应分析[D].成都:西南交通大学,2008.
[6] Soltanien S, Memarpour M, Kilanehei F. Performance assessment of bridge-soil-foundation system with irregular configuration considering ground motion directionality effects[J]. Soil Dynamics and Earthquake Engineering, 2019, 118: 19-34.
[7] 单德山, 韩璐璐, 瞿发宪, 等. 地震动入射角对空心薄壁高墩桥梁地震易损性的影响[J]. 交通运输工程学报, 2020, 20(6): 90-103.
[8] 全伟, 李宏男. 曲线桥多维地震时程分析主方向研究[J]. 振动与冲击, 2008,27(8): 20-24,174.
[9] 何晓宇, 李宏男. 海洋平台确定多维地震动最不利输入方向的一种有效方法[J]. 振动与冲击, 2007,26(12): 49-54,170-171.
[10] Menun C, Der kiureghian A. A replacement for the 30%, 40%, and SRSS rules for multicomponent seismic analysis[J]. Earthquake Spectra, 1998, 14(1): 153-163.
[11] Feng R, Wang X, Yuan W, et al. Impact of seismic excitation direction on the fragility analysis of horizontally curved concrete bridges[J]. Bulletin of Earthquake Engineering, 2018, 16: 4705-4733.
[12] 韩恩圳, 何浩祥, 吕永伟. 三维地震动下结构最不利入射角度研究[J]. 振动工程学报, 2016, 29(1): 132-139.
[13] 张宇, 李全旺, 樊健生. 框架结构在双向地震动作用下的最大结构反应[J]. 工程力学, 2012, 29(11): 129-136.
[14] Smeby W,Kiureghian A. Modal cambinations nules formulticam ponent earthquake excitation[J]. Earthquake Engineering and Structure Dynamic, 1985, 13, 1-12.
[15] Lopez O, Torres R. The critical angle of seismic incidence and the maximum structural response[J]. Earthquake Engineering & Structural Dynamics, 1997, 26(9): 881-894.
[16] 朱俊, 李小军, 梁建文, 等. 地震波三维斜入射作用下隧道对场地地表地震动的影响[J].土木工程学报,2020,53(增1):318-324.
[17] 孙纬宇, 严松宏, 汪精河, 等. SV波不同角度入射下近接双隧道的地震响应分析[J].东南大学学报(自然科学版),2019,49(5):956-963.
[18] 耿萍, 陈昌健, 王琦, 等. 地震P波对圆形隧道最不利入射角研究[J]. 现代隧道技术, 2018, 55(增2): 579-587.
[19] 周双喜, 叶国涛, 张季. SV波斜入射时双线并行地铁隧道横截面地震响应分析[J].地震工程与工程振动, 2021, 41(5): 1-12.
[20] 朱传彬, 张建经. SH波斜入射盆地地表的时域非线性地震反应分析[J]. 地下空间与工程学报, 2014, 10(4): 834-841.
[21] 李丽, 景鹏旭, 徐沁. 基于多点地震动输入条件下的土质边坡地震反应分析[J]. 防灾减灾工程学报, 2018,38(2):352-358,384.
[22] 周辉, 张传庆, 冯夏庭, 等. 隧道及地下工程围岩的屈服接近度分析[J]. 岩石力学与工程学报, 2005, 24(17): 3083-3087.
[23] 张传庆, 周辉, 冯夏庭, 等. 基于屈服接近度的围岩安全性随机分析[J]. 岩石力学与工程学报, 2007, 26(2): 292-299.
[24] 李文渊, 吴启红. 基于JRC-JCS模型的屈服接近度及地下工程围岩稳定性分析方法[J]. 岩土力学, 2012,33(增1):19-24.
[25] 周国林, 谭国焕, 李启光, 等. 剪切破坏模式下岩石的强度准则[J]. 岩石力学与工程学报, 2001,20(6):753-762.
[26] 李杰,李国强著. 地震工程学导论[M]. 北京:地震出版社, 1992.
[27] 林志斌. FLAC3D 5.0使用教程与实例分析[M]. 徐州:中国矿业大学出版社, 2020.
