Dynamic performance of cable-stayed bridge tower with multi-stage pendulum mass damper under wind excitations --Ⅰ： Theory

In this paper, wind-induced vibration control of a single column tower of a cable-stayed bridge with a multi- stage pendulum mass damper （MSPMD） is investigated. Special attention is given to overcoming space limitations for installing the control device in the tower and the effect of varying natural frequency of the towers during construction. First, the finite element model of the bridge during its construction and the basic equation of motion of the MSPMD are introduced. The equation of motion of the bridge with the MSPMD under along-wind excitation is then established. Finally, a numerical simulation and parametric study are conducted to assess the effectiveness of the control system for reducing the wind-induced vibration of the bridge towers during construction. The numerical simulation results show that the MSPMD is practical and effective for reducing the along-wind response of the single column tower, can be installed in a small area of the tower, and complies with the time-variant characteristics of the bridge during its entire construction stage.     

广西昭平大王顶金矿床深部盲矿预测的构造叠加晕模型

广西大王顶金矿为热液型金矿,成矿严格受岩体和构造控制,成矿具有多期多阶段叠加特点。文章总结了该矿床及不同阶段元素组合,在研究单一次成矿形成的原生晕轴向分带和识别出不同成矿阶段形成矿体(晕)在空间上的叠加结构基础上,建立了矿床的构造叠加晕模式,确定了盲矿预测标志,对矿床深部给出了盲矿靶位。     

黑龙江三道湾子金矿深部盲矿预测的构造叠加晕研究

文章在研究三道湾子金矿床地球化学特征的基础上,确定了矿体-晕的轴向分带及叠加成矿成晕特征,建立了三道湾子金矿床成矿的构造叠加晕模型,用此模型对深部有利成矿部位进行了预测,提出了找盲矿靶位,并取得了好的效果。     

Semiactive variable stiffness control for parametric vibration of cables

In this paper, a semiactive variable stiffness （SVS） device is used to decrease cable oscillations caused by parametric excitation, and the equation of motion of the parametric vibration of the cable with this SVS device is presented. The ON/OFF control algorithm is used to operate the SVS control device. The vibration response of the cable with the SVS device is numerically studied for a variety of additional stiffness combinations in both the frequency and time domains and for both parametric and classical resonance vibration conditions. The numerical studies further consider the cable sag effect. From the numerical results, it is shown that the SVS device effectively suppresses the cable resonance vibration response, and as the stiffness of the device increases, the device achieves greater suppression of vibration. Moreover, it was shown that the SVS device increases the critical axial displacement of the excitation under cable parametric vibration conditions.     

云南会泽县麒麟厂铅锌矿床构造叠加晕特征及找矿意义

麒麟厂铅锌矿床是云南省会泽矿区内的一个独立的特大型矿床,对该矿床１０＃ 矿体的构造叠加晕特征进行了研究,以实现矿床的深部找矿突破。研究表明:麒麟厂铅锌矿床１０＃ 矿体原生晕轴向分带序列从上到下 为 Ａｓ、Ｓｂ、Ｈｇ、Ｂａ、Ｆ→Ｐｂ、Ｚｎ、Aｇ、
Ｃｕ、Ｃｄ、Ｇｅ→Ｌａ、Ｌｉ、Ｂｅ、Ｓｒ、Ｂｉ、Ｍｎ、Ｃｏ、Ｎｉ、Ｖ;在识别１０＃ 矿体群空间叠加结构的基础上,建立了构造叠加晕模式及其成矿指示,并以此对１０＃ 矿体进行了深部成矿预测,提出了１个找矿靶位和２个成矿有利部位,取得了较好的找矿效果,可应用于会泽矿区内矿山厂等其他矿床（段）的深部成矿预测,进一步表明构造叠加晕对沉积－热液强改造型矿床的适用性。      

城市典型建筑地震损失预测方法Ⅱ:地震损失估计

本文在文[1]的基础上,给出城市典型建筑地震损失估计方法。首先,给出砖砌体结构、排架结构和钢筋混凝土结构的破坏分级描述;其次,介绍城市地震人员伤亡及经济损失估计方法。结合文[1]的结构易损性分析方法,以宁波市为例,给出了市区典型建筑的震害矩阵,并对地震作用下的人员伤亡和财产损失进行了估计。     

黏滞阻尼器对拉索参数振动的控制分析

提出采用黏滞阻尼器对拉索参数振动进行控制,建立了黏滞阻尼器控制拉索参数振动的运动方程。从频域和时域以及起振幅值等角度,研究了最优黏滞阻尼器对不同垂度拉索参数振动的控制效果;此外,还研究了最优黏滞阻尼器安装位置对拉索参数振动控制效果的影响。研究表明,黏滞阻尼器可以有效控制拉索的参数振动,控制效果与拉索的激励幅值、最优阻尼器的安装位置和斜拉索的垂度有关。激励幅值越大,控制效果一般越差;最优阻尼器的安装位置越靠近跨中,则控制效果越好;黏滞阻尼器对大垂度拉索的控制效果不及对小垂度拉索的控制效果。     

钢管高强混凝土叠合柱的轴力分配及名义轴压比限值分析

分析了钢管高强混凝土叠合柱中核心钢管混凝土部分和外围叠合混凝土部分之间的轴力分配,讨论了各主要参数对上述轴力分配关系的影响,最后在对大量计算结果进行分析的基础上,建议了相应的设计名义轴压比限值。     

山东牟平邓格庄金矿的叠加晕模式

邓格庄金矿为一大型石英脉型金矿,具有多期多阶段叠加成矿成晕的特点,根据不同成矿阶段形成的矿体（晕）及包裹体气候,离子晕在空间上的叠加结构,建立了矿床的原生叠加晕模式,确定了判断矿床剥蚀程度的标志。     

安装液压阻尼系统储罐的实用设计方法

本文将液压阻尼系统（ＨＤＳ）应用在立式钢制罐上,以减小其地震响应,在获得安装ＨＤＳ所需的参数取值后,采用不同方法进行计算,得到便于工程实际实用的实用设计方法。