新疆克孜尔坝址设定地震研究

以新疆克孜尔坝址为研究对象,综合确定性和概率地震危险性分析方法的优点,依据最大贡献和构造一致原则,提出了基于有效峰值加速度(EPA)的设定地震方法,给出了新疆克孜尔坝址100a超越概率为2％的设定地震参数——震级、震中距和反应谱．该设定地震反应谱介于一致概率反应谱和规范标准反应谱之间,克服了一致概率反应谱和规范标准反应谱的不足,证实了设定地震方法的合理性．     

滑移隔震结构的动力反应分析

首先介绍了隔震结构的另一种形式——滑移隔震技术;通过实例分析计算,比较了隔震滑移结构与传统结构的抗震性能,讨论了不同摩擦系数作用下对隔震性能的影响。     

黄土易损性与地震黄土滑坡关系探讨

1995年甘肃省永登发生的5．8级地震,触发了150多处滑坡,为了分析地震区黄土滑坡灾害的成因,通过对地震滑坡区域内黄土的基本物理力学性质和动力特性的试验,研究了黄土的相关性质与易损性关系,并对地震引起黄土滑坡的原因进行了探讨．研究结果表明,黄土易损性与地震黄土滑坡有密切关系．易损性大的黄土,地震引发滑坡灾害严重．     

Site effects on earthquake ground motion based on microtremor measurements for metropolitan Beijing

A campaign of microtremor measurements was conducted in summer 2007 for assessing local site effects of seismic strong ground motion in metropolitan Beijing. Using the measurements from over 600 sites with approximately 1―2 km spacing covering the entire area inside Beijing’s 5th Beltway, we present the analysis results in the form of contours of the predominant resonant frequency, the thick- ness of the uppermost soft sediments, and the ground motion amplification factor. The microtremor- derived soft sedi...     

Study of the ionospheric anomaly before the Wenchuan earthquake

The behavior of the ionosphere before the Wenchuan earthquake is analyzed with the global TEC and ionospheric foF2 observed at Xiamen. It can be found from TEC maps that in the afternoon (16―18LT) on May 9, 2008, 3 days before the earthquake, there is an enhancement of TEC with an amplitude of 10―15 TECU appearing in the east-south direction of Wenchuan, and another enhancement appears at the conjugate region of the Southern Hemisphere with an amplitude of 10 TECU, but no obvious in-crement or decrement can be seen in other regions on global scale. It can also be found that on May 6 (6 days before the great earthquake), there is a decrement of TEC with small amplitude of 4TECU and larger area with 80° along the longitude in southern China, and there is no synchronous decrement observed at the conjugate region of the Southern Hemisphere. There are also many anomalies ob-served by ionosondes across China. The result shows that foF2 and TEC abnormally increased, which is different from pervious results that ionospheric parameters decreased prior to earthquakes. Pre-liminary results suggest that the enhancement on May 9 maybe has a close relationship with the pos-sible enhancement of ionospheric electric fields, and it may be an ionospheric precursor of earth-quakes. Whereas the decrement on May 6 may be attributed to the geomagnetic disturbance appearing on May 5.     

高烈度区高桥墩的概念设计

高烈度区的高墩桥梁给设计带来很大的问题,使得结构不规则,影响了桥梁的抗震能力。概念设计通过长期积累的实际设计经验和理论研究的成果,从总体上把握设计的原则是非常重要和有意义的。文章针对高烈度区桥梁高墩的特点,对高桥墩桥梁的抗震概念设计方法进行了探讨。     

面向任务的拼修策略问题及求解算法

研究了一种面向任务的拼修策略问题, 建立了该问题的多维背包问题模型,提出了基于遗传算法的求解方案.然后设计了一种求解效果较好的两阶段遗传算法, 进行了包括编码, 交叉,变异, 最优前沿限定算法, 适应度函数,选择策略和退火局部搜索算法在内的全面的分析和设计. 最后,给出了一个算例,检验了求解方案的实用性,并且通过计算实验分析了遗传算法的有效性.     

倾斜入射地震下结构-地基的透射边界

为正确反映结构-地基动力相互作用,消除传统固定边界模型将地震能量全部陷入计算模型的不合理现象,该文提出倾斜入射地震下结构-地基动力反应分析的有限元模型及其透射边界.有限元模型由主网格、自由场网格和侧边透射层网格组成,地震以入射平面波形式输入,以入射波运动作为非惯性参考坐标系建立相对运动的动力方程.结构-地基实际反应为相对运动与入射波动之和,算例表明透射边界模型能有效地透射倾斜入射地震下结构-地基动力反应的辐射分量.     

高强混凝土短柱抗震性能试验研究

通过对高强混凝土短柱在轴压力和水平反复荷载作用下抗震性能的试验研究,分析了轴压比和配箍率对高强混凝土短柱延性的影响,得出了满足一定位移延性要求的高强度混凝土短柱的轴压比限值和柱箍筋加密区最小体积配筋率的建议值,可供设计参考。     

外扰动Riemann几何在地震预测中的应用

研究了球对球Ｒｉｅｍａｎｎ几何在外扰动下的稳定性,主要讨论引力波入射到该物体时,发生散射和吸收的方式,这个问题的答案显然在地震预测研究中存在着应用前景。在理论上,这些答案还引发进一步的兴趣：它将更深入地揭示广义相对论时空性质。