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考虑桩-土-结构相互作用,建立整个结构体系模型,在土槽实验室模拟框架结构在近场地震作用下的反应。由于下部结构的不可控性和土体的不确定性,提出采用反演分析识别下部结构的动力反应。试验中通过传感器有效的获取下部结构状态信息,确定桩-土工作状态,运用子结构的概念完成整个结构体系的拟动力试验。利用实验室大型土槽,设计一个以钢管桩为基础的8层框架结构,探讨脉冲型地震和常规地震下作用下钢筋混凝土框架结构的反应。通过对比结构的破坏形态、底层的位移时程曲线和滞回曲线得到:脉冲型地震作用下,结构的反应远远大于常规地震下的反应;高强度的速度脉冲将引起结构产生更大的残余变形,同时结构有更高的位移需求。分离出基础引起的结构变形,基础的转角将大大增加结构的顶点位移,并且近场地震放大作用更加明显。
Considering the pile-soil-structure interaction, the entire structural system model is established, and the response of the frame structure in near-field earthquakes is simulated in the trough laboratory. Due to the uncontrollability of the substructure and the uncertainty of the soil, an inverse analysis is proposed to identify the dynamic response of the substructure. In the experiment, the sensor is used to obtain the information of the substructure structure effectively and determine the pile-soil working state. The concept of substructure is used to complete the quasi-dynamic test of the whole structural system. Using a large laboratory soil trough, an 8-story frame structure based on steel pipe piles was designed to discuss the reaction of the impulse earthquake and the reinforced concrete frame structure under the action of conventional earthquakes. By comparing the failure modes of the structure, the underlying displacement time history curve and the hysteresis curve, the response of the structure is far greater than that of the conventional earthquake under the action of impulsive earthquake. The high-intensity velocity pulse will cause the structure to produce larger residuals Deformation, while the structure has a higher displacement needs. The structural deformation caused by the foundation is separated. The basic corner will greatly increase the vertex displacement of the structure, and the effect of near-field seismic amplification is more obvious.