基于ANSYS特大跨度悬索桥施工及运营阶段的受力分析

借助大型有限元分析软件研究特大跨度悬索桥索的找形，根据施工前、施工阶段及运营阶段的受力特性，得到在每一阶段跨中节点的位移，为实际的悬索桥的施工提供了依据，也为大跨度悬索桥的后续爱力分析，如移动荷载作用、风荷载作用以及地震力的作用提供了前提和保证。     

单薄壁高墩连续刚构桥施工阶段稳定性分析

对高墩预应力混凝土连续刚构桥的主墩,在悬臂施工过程中,施工至最大悬臂状态时为其在施工过程中的最不利状态。本文结合实际工程,对单薄壁高墩连续刚构桥在施工阶段的各种最不利荷载组合下的稳定性进行分析。     

高层建筑结构体系的特点及转换层施工技术

高层建筑结构转换层的跨度和承受的竖向荷载都很大,从而加大了混凝土浇筑施工的难度,文章对转换层混凝土浇筑的技术要点和施工技术作了阐述。     

屋顶绿化的技术探讨

指出了对屋顶绿化施工中应注意的问题,从屋面荷载、防水层保护、种植介质等方面详细地探讨了解决关键问题的方法,以期作为在屋顶花园施工时提供参考.     

屋顶绿化的技术探讨

指出了对屋顶绿化施工中应注意的问题，从屋面荷载、防水层保护、种植介质等方面详细地探讨了解决关键问题的方法，以期作为在屋顶花园施工时提供参考。     

跨水桥梁基础冰荷载计算研究

近年来,公路工程逐渐向复杂地带延伸,使得桥梁的类型更加多样化,跨河、穿山公路的修建对桥梁的施工技术提出了更高的要求。文章结合作者多年工作经验,分析了几种冰荷载计算公式的适用性,提出了跨海桥梁基础冰荷载计算需要考虑的因素,结合某跨水桥梁基础,给出了冰荷载计算算例。     

温度应力对钢筋混凝土结构影响及构造措施

本文论述了温度应力、温度荷载的取值,并根据实际情况提出了结构设计和施工时裂缝控制的构造措施。     

防护脚手架搭设施工质量控制和安全结构计算分析

介绍了高边坡防护脚手架搭设施工方法、施工工艺质量控制、安全结构计算分析;施工作业期间在各种荷载和气候条件的作用下,保证坚固、不变形、不摇晃、不倾斜、保持稳定;并且搭折简单、搬移方便,能多次周转使用。     

无粘结预应力施工探讨

随着工程实践和设计、施工技术的不断发展完善,目前已形成设计、施工、无粘结预应力 钢筋的加工制作互相配套的技术体系,该项技术在国内得到普遍的推广和应用,尤其在高层建筑、大荷载、 大跨度梁板建筑结构中。     

景观栈道施工质量技术控制措施——以白云山青山绿地改造工程为例

景观栈道凭借其独特的观景特色,在森林公园中的使用越来越广泛。栈道开放后,人流量大,对栈道的集中荷载大,因此加强景观栈道施工质量的技术控制措施显得极其重要。以白云山青山绿地改造工程为例,深入探讨景观栈道施工技术措施,总结出栈道施工要坚持安全第一、严把材料进场质量和施工质量、坚持生态环保等经验。     

在顺风情况下对双线滑索小车运行速度的研究

指出顺风条件下,滑索在运行时所受到的影响,根据静力平衡构建有荷滑索的曲线方程。在风载作用下对双线滑索小车进行动力学分析,确定有风载时滑索小车的加速度,对双线滑索的运行过程进行分析,确定在顺风的情况下,风载的大小对滑索小车运行速度及运行状态的影响,并总结出双线滑索小车在不同情况下速度的计算方法,最后举例进行计算验证。     

槽式太阳能聚热器风载荷数值模拟研究

采用计算流体力学(CFD)理论建立了计算模型,对槽式太阳能聚热器不同角度、不同风速、聚热器板之间不同缝隙对风载荷的影响进行了分析。结果表明:聚热器随风速和角度变化对载荷影响较大,聚热器之间缝隙对风载荷影响几乎不变。     

树木抗风能力测试新方法

介绍一台由我国自行研发的树木抗风能力测试装备与方法，基于树木力学原理，通过将角传感器合理布置在树干上实时监测树干角度变化，结合实时风速，利用树木抗风能力预测分析系统，可测算该树能够承受的最大风速或最大风力等级。以2株樟Cinnamomum camphora为研究对象，采集了樟在风载荷作用下树干形变的角响应信息，测得樟能够承受的最大风速和临界断裂的破坏方式及断裂位置。本方法可为树木在大风或台风来临前是否需要防护提供科学依据，同时可为抗风性树种选择提供理论支撑。     

风荷载作用下的钢管混凝土拱桥非线性稳定性分析

淳安南浦大桥为一净跨径308m中承式钢管混凝土桁式拱桥，宽跨比较小，该桥拱肋的横向稳定是桥梁安全性的关键，文章运用非线性稳定分析的基本理论，得出了该桥在不同风荷载作用下稳定性分析的结果。结果表明：风荷载对该桥稳定性的影响很小，而材料非线性对该桥的稳定性影响较大。     

轻型木结构建筑台风荷载响应研究进展

主要介绍了国内外轻型木结构建筑台风荷载响应的相关研究。简述了台风对木结构建筑作用的分析与计算方法;详细介绍了佛罗里达国际大学风墙实验;概述了用于预测风致荷载响应的有限元数值模型建模技术的发展与模型的加载和验证方法;分析了建模方法对结构行为的影响。该文可为轻型木结构建筑的风工程学理论、材性研究及防台风的设计提供借鉴。     

履带式遥控风力灭火机的设计与研究

为了提高灭火效率、缩短灭火距离、解决灭火人员负载过重及灭火安全等问题,本文通过对履带式遥控风力灭火机工作原理的分析及总体方案的确定,设计了履带式遥控风力灭火机行走机构.设计的履带式遥控风力灭火机可以实现远程遥控且具有良好的爬坡能力和通过能力.     

内蒙古户用风力发电系统供电能力分析

指出了在内蒙古无电地区,采用离网型风力发电系统为用户提供生活用电是一种典型的解决用电的方案。以锡林郭勒地区为例,依据测风数据对该系统的发电能力进行了评估和计算,通过该系统的供电量与用户用电量及负荷变化规律的对比分析,证明了该系统的供电能力能够满足用户的用电需求。     

基于 ANSYS 的风机蓄能器抱箍疲劳分析

疲劳失效一般在工作初期不会体现,而工作一定时间后才出现断裂失效,因此它成为存在许多交变应力场合下的致命隐患。风机旋转的工作状态决定其中存在交变载荷,使得如蓄能器抱箍等随风机旋转的部件存在疲劳断裂的现象,本文针对风机安全工作对蓄能器抱箍疲劳寿命的要求,采用Solidworks对蓄能器抱箍进行建模,并用ANSYS对其进行强度、变形及疲劳断裂的仿真分析,合理解释抱箍断裂的原因,并针对寿命要求给出相应建议。     

Effects of thinning on wind damage in Pinus thunbergii plantation ——Based on theoretlcal derlvation of risk—ratios for assessing wind damage

Based on paper of “Theoretical derivation of risk-ratios for assessing wind damage in coastal forest“,wind damage in the pine coasteal forest,which was thinned at four levels in December of 1997,was investigated for four successive growing seasons.Besides wind damage,the wind profiles outside and inside the coastal forest stand and the distributions of optical stratification porosity (OSP) were also observed.Based on these data,risk-ratios of wind damage for both individual trees and stands were estimated according to the methods developed in “Theoretical derivation of risk-ratios for assessing wind damage in a coastal forest“.The results showed that risk-ratios of wind damage,which were calculated from the meen height and diameter only and from the combination of wind and stand sructure profiles,accurately predicted wind damage in the plantation.Relationships between different thinning ratios and incidence of wind damage showed that stand stability decreased soon after the thinning.This was due to the immediate effects of thinning on increasing the canopy roughness and wind load,and on decreasing the sheltering effects from surrounding trees.However,thinning strategies could improve the stability by long-term effects on growthand development of trees against extreme wind.Only canopy damage was recorded during the experimental period,no stem damage was found,even though the maximum 10-min wind speed outside the coastal forest attained 30.2m s^-1.The results obtained in this study indicate that thinning is the most effective silvicultural strategy available for managing coastal forest despite the increased probability of wind damage soon after thinning.     

Consideration of strong winds, their directional distribution and snow loading in wind risk assessment related to landscape level forest planning

Forest planning needs to assess various risks that may cause economic or other losses to forest owners. This study aimed at developing a wind risk assessment method, which considers the occurrence and directional distribution of strong winds, and the effect of snow loads and support by neighbouring trees on the expected wind damage. For this purpose, regression models were developed for predicting the critical wind speeds needed to uproot Scots pine, Norway spruce and birch trees at the downwind stand edges in Finnish conditions under unfrozen soil conditions, based on the characteristics of both downwind and upwind stand, and additional snow load on tree crowns. Furthermore, a risk index was developed for the forest landscape, based on the critical wind speeds of stands, occurrence of strong winds and their directional distribution, and the prevailing snow loading in the region. Thereafter, the mean risk index was used as an objective variable in heuristic optimization in forest planning to demonstrate how the optimal cuttings and the spatial layout of the landscape may change depending on the wind and snow conditions and the support that trees provide to each other. Our results show that the directional distribution of strong winds shape the optimal forest landscape structure markedly. Consideration of snow loading in the calculation of critical wind speeds increased the mean risk clearly and produced slightly more aggregated landscape structures in terms of tree height. The consideration of support that neighbouring trees provide to each other had minor effects. To conclude, the consideration of risk of wind induced damages in forest planning calculations clearly affects the selected cutting strategies and impacts the spatial layout of the landscape.