为了减小钢筋混凝土剪力墙在地震后的损伤和残余变形,提出了内置碟簧自复位钢筋混凝土剪力墙(self-centering RC shear wall with disc spring devices, SCSW-DSD),通过在墙脚两侧安装碟簧装置为墙体提供恢复力并保护墙脚处混凝土。对1...为了减小钢筋混凝土剪力墙在地震后的损伤和残余变形,提出了内置碟簧自复位钢筋混凝土剪力墙(self-centering RC shear wall with disc spring devices, SCSW-DSD),通过在墙脚两侧安装碟簧装置为墙体提供恢复力并保护墙脚处混凝土。对1片SCSW-DSD和1片普通混凝土剪力墙进行了拟静力加载试验,对比分析了两者的滞回性能、水平刚度退化、残余位移及损伤演化过程。结果表明:相比普通混凝土剪力墙,SCSW-DSD的水平荷载-位移曲线无下降段,承载力略降低,但SCSW-DSD最大加载位移角达到了3%,最大加载位移提高了44.4%,具有较好的变形能力;在相同加载位移下,SCSW-DSD的残余位移均较普通混凝土剪力墙的小,最大残余位移角减小约65.8%,具有良好的自复位性能;SCSW-DSD裂缝发展较慢且数量较少,其约束边缘纵筋应变小于0.007,水平分布钢筋应变小于0.001,均较普通混凝土剪力墙的小,表明SCSW-DSD损伤程度较小。展开更多
The influence of hot mantle intrusive body on tectonic stress field and displacement field of Dabie orogenic belthave been analyzed by means of finite element method. Numerical simulations show that the intrusion of h...The influence of hot mantle intrusive body on tectonic stress field and displacement field of Dabie orogenic belthave been analyzed by means of finite element method. Numerical simulations show that the intrusion of hot mantle material leads to an extensional stress state in the upper crust of central Da bie mountains, while compressivestress state appears on both sides of orogenic belt under the action of horizontal compression from Yang tze craton.This is in accordance with the actual faulting tectonics in this area. Possible evolution trend in transition area isdiscussed, too.展开更多
The editors wish to highlight the articles appearing in this issue.The first article,entitled“New physics of supersonic ruptures”by Boris G.Tarasov,concerns the development of a new theory on the potential occurrenc...The editors wish to highlight the articles appearing in this issue.The first article,entitled“New physics of supersonic ruptures”by Boris G.Tarasov,concerns the development of a new theory on the potential occurrence of ruptures after deep underground earthquakes.Two other articles belong to our first special theme of“Disaster evolution in deep underground.”The final two articles introduce a nonlocal damage fracture phasefield model for rock‐like materials and the gas–liquid displacement in microcleats for mass transfer through gas‐or water‐driven displacement.These five papers indeed explore various aspects of deep underground science and engineering and constitute an integral component of deep underground fundamentals.展开更多
The two one-state-variable, rate- and state-dependent friction laws, i.e., the slip and slowness laws, are com- pared on the basis of dynamical behavior of a one-degree-of-freedom spring-slider model through numerical...The two one-state-variable, rate- and state-dependent friction laws, i.e., the slip and slowness laws, are com- pared on the basis of dynamical behavior of a one-degree-of-freedom spring-slider model through numerical simulations. Results show that two （normalized） model parameters, i.e., A （the normalized characteristic slip distance） and β-α （the difference in two normalized parameters of friction laws）, control the solutions. From given values of △, β, and α, for the slowness laws, the solution exists and the unique non-zero fixed point is stable when △〉（β-α）, yet not when △ 〈（β-α）. For the slip law, the solution exists for large ranges of model parameters and the number and stability of the non-zero fixed points change from one case to another. Results suggest that the slip law is more appropriate for controlling earthquake dynamics than the slowness law.展开更多
文摘为了减小钢筋混凝土剪力墙在地震后的损伤和残余变形,提出了内置碟簧自复位钢筋混凝土剪力墙(self-centering RC shear wall with disc spring devices, SCSW-DSD),通过在墙脚两侧安装碟簧装置为墙体提供恢复力并保护墙脚处混凝土。对1片SCSW-DSD和1片普通混凝土剪力墙进行了拟静力加载试验,对比分析了两者的滞回性能、水平刚度退化、残余位移及损伤演化过程。结果表明:相比普通混凝土剪力墙,SCSW-DSD的水平荷载-位移曲线无下降段,承载力略降低,但SCSW-DSD最大加载位移角达到了3%,最大加载位移提高了44.4%,具有较好的变形能力;在相同加载位移下,SCSW-DSD的残余位移均较普通混凝土剪力墙的小,最大残余位移角减小约65.8%,具有良好的自复位性能;SCSW-DSD裂缝发展较慢且数量较少,其约束边缘纵筋应变小于0.007,水平分布钢筋应变小于0.001,均较普通混凝土剪力墙的小,表明SCSW-DSD损伤程度较小。
文摘The influence of hot mantle intrusive body on tectonic stress field and displacement field of Dabie orogenic belthave been analyzed by means of finite element method. Numerical simulations show that the intrusion of hot mantle material leads to an extensional stress state in the upper crust of central Da bie mountains, while compressivestress state appears on both sides of orogenic belt under the action of horizontal compression from Yang tze craton.This is in accordance with the actual faulting tectonics in this area. Possible evolution trend in transition area isdiscussed, too.
文摘The editors wish to highlight the articles appearing in this issue.The first article,entitled“New physics of supersonic ruptures”by Boris G.Tarasov,concerns the development of a new theory on the potential occurrence of ruptures after deep underground earthquakes.Two other articles belong to our first special theme of“Disaster evolution in deep underground.”The final two articles introduce a nonlocal damage fracture phasefield model for rock‐like materials and the gas–liquid displacement in microcleats for mass transfer through gas‐or water‐driven displacement.These five papers indeed explore various aspects of deep underground science and engineering and constitute an integral component of deep underground fundamentals.
基金supported by Academia Sinica (Taipei) and Science Council (Grant NSC96-2116-M-001-012-MY3).
文摘The two one-state-variable, rate- and state-dependent friction laws, i.e., the slip and slowness laws, are com- pared on the basis of dynamical behavior of a one-degree-of-freedom spring-slider model through numerical simulations. Results show that two （normalized） model parameters, i.e., A （the normalized characteristic slip distance） and β-α （the difference in two normalized parameters of friction laws）, control the solutions. From given values of △, β, and α, for the slowness laws, the solution exists and the unique non-zero fixed point is stable when △〉（β-α）, yet not when △ 〈（β-α）. For the slip law, the solution exists for large ranges of model parameters and the number and stability of the non-zero fixed points change from one case to another. Results suggest that the slip law is more appropriate for controlling earthquake dynamics than the slowness law.
