【作者】 张亮；

【导师】 赵章焰；

【作者基本信息】 武汉理工大学 ， 机械制造及其自动化， 2014， 硕士

【摘要】 地震是一种严重的自然灾害，会对人类生命和财产安全造成巨大威胁。地震具有突发性，难以预测，防震减灾工作必须以预防为主，做好工程结构的抗震设防。因此，结构的抗震研究是工程领域的重要研究内容。港口起重机在港口运营中发挥着举足轻重的作用，而世界上大部分港口都位于地震带上，因此起重机的抗震研究具有非常重要的意义。本文以龙门起重机为研究对象，运用不同的抗震分析方法分析其地震响应特性，并展开减隔震控制的研究。本文的研究内容及得出的相关结论如下：（1）运用静力法计算龙门起重机的地震作用效应，分析其强度、刚度和稳定性，并找出结构薄弱的部位。静力分析结果表明：该龙门起重机能够抵御7度罕遇地震的作用。（2）对龙门起重机进行模态分析，为反应谱分析提供所需的模态频率，介绍反应谱分析理论及其在ANSYS中的实现方法，对龙门起重机金属结构进行反应谱分析。结果表明：反应谱分析结果与静力分析结果相比，应力、位移均偏小。（3）选取典型强震记录和人工地震记录，并将其加速度幅值调整为0.22g，采用动力时程分析法对起重机进行地震响应分析，获得危险截面处地震响应曲线。结果表明：龙门起重机在最大峰值为0.22g的不同地震波作用下的响应相差很大，这说明除了峰值外，地震波的频谱和持时也会对地震响应产生重要影响；最终分析结果也表明该龙门起重机能够抵御7度罕遇地震的作用。（4）选取适合龙门起重机的隔震方案，并确定相关参数。通过有限元分析软件ANSYS进行数值计算仿真，对比分析了龙门起重机结构在有无隔震系统下的动态特性和地震响应。分析结果表明：施加隔震系统后，龙门起重机各关键位置的地震响应均有所降低，隔震效果明显。更多还原

【Abstract】 Earthquake disasters can bring serious threat to people’s life and property. Earthquakecannot be predictable and has brought heavy losses to human beings. To MitigateEarthquake disaster should be based on prevention and improve the seismicperformance of engineering structure. Therefore, how to mitigate earthquake damageis a valuable and important research project for engineers. Quay cranes play animportant role in modern harbors, most of which are located in seismic zone, soanti-seismic research of port cranes is of great significance.In this paper, a gantry crane is selected as an analysis object. Different methods areused to analysis the seismic behaviors of the crane under different working conditionsand seismic load through numerical simulation. The detailed research and mainconclusions in this dissertation are summarized as follows:(1) Firstly, use static method to analyze the seismic effect of the gantry crane, findthe maximum displacement and stress of the crane metal structure, and analyze itsstability. Static analysis results showed that: gantry cranes can withstand s7degreerare earthquake.(2) Carry out modal analysis of gantry crane to obtain the indispensible modalfrequency for response spectrum analysis of the crane. Introduce the theory ofresponse spectrum analysis and its implementation in ANSYS, and carry out theresponse spectrum analysis of gantry crane. It can be found that the stress anddisplacement results of response spectrum analysis are lower than that of staticanalysis.(3)Select the typical strong motion acceleration records of the past and artificialearthquake acceleration records, whose amplitudes have been adjusted to0.22g.Carry out time-history analysis of the gantry crane, and calculate the correspondingseismic response of dangerous sections. The results demonstrate that: the seismicresponse of gantry crane vary widely, though the maximum acceleration amplitudesof these records are the same. Besides amplitudes, the spectrum of seismic wave and its duration also affect the seismic response. Final analysis results showed that: gantrycranes can withstand s7degree rare earthquake.(4)Select the appropriate gantry crane seismic isolation device and determine therelated isolation parameters. The dynamic characteristics and seismic responses of thecrane with and without isolation system are researched by finite element analysissoftware ANSYS. The comparison results show that significant reduction in theseismic response amplitude can be seen for the structure with the isolation system.The isolation device works well.更多还原