随着中国式城镇化的不断发展,促进城市从粗放式增长向精细化发展.以此为目的,探索城中村改造的方法与路径.以城中村的公共空间更新为切入点,针对城中村更新存在的主要问题,并对存在"缺乏完整空间""破旧闲置""功能复合"等问题的公共空间进行研究.在此基础上,以深圳市福田村为例,研究城中村"功能空间"和"闲置空间"两种不同的类型,揭示了城中村"功能型"和"闲置型"空间再利用的方法.最终提出城中村公共空间的更新策略,为全国其他城中村公共空间改造提供理论基础与科学依据.
悬挂式高层建筑采用外框架和楼层梁分别施工的方法,外框架在逆向累积提升过程中,核心筒和屋顶桁架在日照效应下会影响外框架吊柱的精确定位.以上海金桥国培地块研发项目A塔为研究对象,建立有限元模型,结合上海地区夏季施工计算了日照温差,分析正面日照和45℃角日照两种工况下,累积提升过程中吊柱控制点的位移特征.结果表明,45℃角日照效应对提升框架关键点的变形影响无法满足施工要求.通过采取变形控制措施,计算表明,所有8个提升步中的最后3步结构的拼装应避免在最高温时45℃角日照时进行,其他结构可以全天候施工.
为解决建筑施工过程中的环境污染问题,从污染防治参与方的角度,利用演化博弈理论构建政府、施工企业、社会公众多层次模型,对其进行动态稳定性分析,得到不同条件下各方倾向做出的决策组合,并运用MATLAB对各均衡点进行仿真分析.结果表明,政府策略与其净收益、施工企业和社会公众的行为均有关系,施工企业和社会公众是否选择积极防治污染主要取决于自身的净收益.
The waste fly ash obtained after waste incineration was used in road engineering,which could promote the rational use of resources and the development of green transportation.To study the effect of fly ash on the shrinkage performance of ce-ment-stabilized macadam base material,cement-stabilized macadam with fly ash of 1%,2%,3%and 4%(aggregate mass fraction)was prepared respectively.Thr temperature shrinkage test and dry shrinkage test were carried out.The dry shrinkage strain,dry shrinkage coefficient,temperature shrinkage strain and temperature shrinkage coefficient of cement-stabilized macadam with different fly ash content were obtained.The test results showed that the shrinkage performance of cement-stabilized macadam could be improved with 1%fly ash content.However,with the increase of fly ash content,the temperature shrinkage strain and dry shrinkage strain increase.It was not conducive to the shrinkage deformation resistance of cement-stabilized macadam.
In southwest China,a large amount of solid waste such as tailings,coal gangue,waste rock,coal ash and so on is formed when mining minerals,which not only easily causes geological disasters in mines,but also causes great waste of mineral resources.In response to the national policy of accelerating the construction of ecological civilization and promoting the conser-vation and efficient utilization of mineral resources in the autonomous region,this paper takes Tanggula Mountain section of G109 National Highway as the research site,replaces the original base material with coal gangue and other waste slag,designs different mix ratios,and passes unrestricted compressive strength test,freeze-thaw compressive strength ratio test and erosion resistance test.To explore the feasibility of applying coal gangue to road base in Xizang area.The results show that the com-pressive strength of the base material can be increased and the cumulative brush amount of the specimen can be reduced by re-placing the natural stone with the appropriate amount of coal gangue.With the increase of coal gangue content,the ratio of freeze-thaw strength of the specimens increases on the whole.According to the analysis of the experimental results,the optimal mix ratio is m(cement)∶m(lime)∶m(fly ash)∶m(coal gangue)∶m(crushed stone)=2∶10∶38∶35∶15.
