施工技术 2010年9月 78 CONSTRUCTION TECHNOLOGY 第39卷第9期 黄土地区某深基坑工程降水试验研究 武乾,赵浩,林源,胡长明 (西建筑科大学土木工程学院,陕西西容710055) [接]以地处湿性黄土地区的菜深基悦工程降水设计为背墨,基于降水试,采用“试算法”得出了舍的降水 设计参数,在此基上,运用“大并法”进行基悦降水设计,初步拟定了程降水方亲:利用非饱和土非穆定济流 理论,对建场区障水故果进行了数棋拟与分析,得到了基内外浴流扬在降水过程中的变化规律,为降水方意 的优化设计提供科学依据. [关键词]深基悦:降水设计:湿陪性黄土:地铁季站:数值横拟 [中分类导]TU753.1 [立献标识移]A[支章编]10028498(2010)09-0078-04 Experiment Research on Dewatering of a Deep Foundation Excavation in the Loess Region Wu Qian Zhao Hao Lin Yuan Hu Changming Civil Engineering College Xi'an University of Architecture and Technology Xi'an Shaanxi 710055 China) Abstract:With dewatering design of some deep foundation excavation engineering in the loess region basing on the dewatering test the authors get appropriate parameter by test method.On this basis they use Great Well Method to design the foundation excavation and draw up an initial dewatering scheme. Besides using the theory of unsaturated soil dewatering effects is simulated on the proposed site area and variation seepage inside and outside the foundation exeavation is obtained in the proeess of dewatering.As a result it provides simulated scientific basis for optimization design of dewatering scheme. Key words:deep foundation excavation:dewatering design:collapsibility loess:subway station:numerical simulation 1工程概况 春1土层物理力学参 某地铁车为地下4层岛式站台车站,标准段结 Table 1 Physical and mechanical properties of soil 构外包尺寸20.9m×24 46m(宽x高),季落长度 选系 压像 度/ 盐聚力/内摩 土居 / 泊松比数/ 135.6m 基杭标准段宽度20.9m 盾构井段宽度为 m kPa角/(o) (m/d) (MPa-1) 28.2m 顶部覆土2...
2010年3月 施工技术 第39卷第3期 CONSTRUCTION TECHNOLOGY 11 贵阳奥体中心主体育场异形柱施工技术 冯云,邹侠,盛圳 (中建三局第一建设工程有限责任公司西部公司,贵州贵阳550002) [摘要]贵阳奥体中心主体育场南北看台有36根混凝土弧形柱,西看台有20根钢结构Y形柱和10根混凝土Y形 柱.由于施工荷载大,仅靠模板体系承担施工荷载困难.经过计算,决定通过合理分段,依靠丫形柱和弧形柱自身 的承载能力承担施工荷载.弧形柱分3步施工,Y形柱分5步施工.为保证弧形柱和Y形柱的施工质量和清水混 聚土效果,采用定型钢模板施工,工厂制作,现场拼装.主要介绍了弧形柱和丫形柱的模板体系及支撑体系的选择 以及施工技术. [关键词]贵阳奥体中心;主体育场;弧形柱;Y形柱 [中图分类号]TU745.2 【文献标识码]A 【文章编号]1002-8498(2010)03-0011-03 Construction Technology of Spatial Shape Column of Main Stadium in Guiyang Olympic Sport Center Feng Yun Zou Xia Sheng Zhen (The West Company The First Construction Engineering Limited Company of China Construction Third Engineering Bureau Guiyang Guizhou 550002 China) Abstract:The north and south stand has 36 concrete arc-ghape columns and the west stand has 20 steel structure Y-shape columns and 10 concrete Y-shape columns in the main stadium of Guiyang Olympic Sport Center.Because of heavy construction load it is difficult for formwork system to bear construction load.By calculation self-bearing capacity of these Y-shape and arc-shape columns is enough to undertake construction load with rational construction segment.So the arc-shape column is constructed for three segments and the Y-shape column is constructed for five segments.To assure their construction quality and fair-faced concrete effect these columns are constructed with shaped steel formwork which is made in factory and assembled on site.In this article the authors mainly show selection and construction technology of f...
施工技术 2011年10月上 18 CONSTRUCTION TECHNOLOGY 第40卷第350期 贵阳国际会展中心大型不对称筒式悬挂 建筑施工应力控制 戴立先,魏晓祥,蒋官业,陈小伟,代舒 (中建钢构有限公司,广东深圳518040) [摘要]贵阳国际会议展览中心C2201大厦为悬挂式建筑,内部受力形式非常复杂.在T程中运用计算机仿真模 拟分析技术对施工工序进行模拟,根据迭代理论设置钢结构施工变形预调值,调整施工过程中建筑体的位形,并通 过千斤顶施加或卸载对建筑体的作用力调配建筑体的整体位形及内部应力,从而实现了安装过程中结构自由受力 状态,并且确保了竣工时建筑体的几何形态、受力状态符合理论设计值. [关键词]高层建筑;悬挂结构;筒式结构;应力控制;仿真模拟;迭代法 [中图分类号]TU745.1 [文献标识码]A [文章编号]1002-8498(2011)19-0018-04 Construction Stress Control of Large Asymmetric Tube Suspension Building of Guiyang International Conference Center Dai Lixian Wei Xiaoxiang Jiang Guanye Chen Xiaowei Dai Shu China Construction Steel Structure Co.Ltd.Shenzhen Guangdong 518040 China) Abstract:C2 201 building in Guiyang international conference is a suspension building and its force form is plicated.Authors use puter simulation technology to simulate the construction process. According to iteration theory they set preset value in the deformation of steel structure construction adjust the building configuration in the construction process.Besides by imposing or uninstalling the force with jack authors adjust the whole configuration and internal stress of building.In this way it achieves free stress condition in the installation process and ensures the geometry of the body and the stress state to consistent with theoretical design value. Key words:tall buildings;suspension structures;tubular structures;stress control;simulation;iteration 悬挂式建筑作为一种新兴的建筑形式具有造型的现代楼宇设计,室外空间利用山地高差以及设 型新颖占地面积小并能减小地震作用等诸多优 置叠落式的大水景,形成景观式的建筑物...
2016年7月下 施工技术 第45卷第14期 CONSTRUCTION TECHNOLOGY 135 D0I:10.7672/8js2016140135 贵安综合保税区综合服务大楼屋面钢结构吊装技术 曾文,门贤君,黄晓彬,王宇浩 (中交第一公路工程局有限公司北京建筑分公司,北京100024) [摘要]以贵安综合保税区建设项目为背景,分析本工程屋面钢结构构造形式及施工难点.从工期、安全、成本等 角度考虑,选择采用移动的拼装单元架为最优技术设计方案.并详细介绍移动平台制作、安装和铝单板安装等施 工工艺. [关键词]安装工程;钢结构;屋顶;吊装;施工技术 [中图分类号]TU758.1 [文献标识码]A [文章编号]1002-8498(2016)14-0135-03 Hoisting Technology of Roof Steel Structure of Gui'an Comprehensive Bonded Zone Service Building Zeng Wen Men Xianjun Huang Xiaobin Wang Yuhao Beijing Branch of the First Highucay Engineering Bureau Co.Lid.Beijing 100024 China) Abstract:Taking Gui'an Comprehensive Bonded Zone construction project as the background the roof steel structure form and the difficulty of construction are analyzed.Considering the time limit safety and cost etc. adopting mobile assembling unit frame for optimal design is chosen At the same time the mobile platform fabrication installation and aluminum single plate installation construction technology are introduced in detail. Key words:installation;steel structures;roofs;hoisting;construction 1工程概况 外悬挑钢屋架、铝板装饰 蓝灰色钢制压顶 53.658 贵安综合保税区综合服务大楼总建筑面积 1400 49865.58m2 地上建筑面积37014.68m2 地下 12850.9m2 地上9层,地下1层,建筑计算高度为 058 It 49.75m;屋顶为钢结构造型,顶标高53.050m 钢结 构悬挑出建筑物外立面9.855m(含天沟);檐口下 92400 -0.450 方为斗拱造型和铝单板吊顶,檐口上方顶为金属彩 石瓦屋面,最内面为夹胶玻璃采光顶.檐口外挑钢 图1综合服务大楼立面 构架沿着建筑物外立面一圈布置,总长500余m(见 Fig.1 Comprehensive service building elevation 图1),为框架结构. 碳喷涂,单品铝单板及骨架质量约为300kg 铝单板 2构造形式及重难点 内衬1.5mm厚镀锌铁皮加50mm厚保温棉. 本工程屋面钢结构.总量达900t 钢结构节点均 1)难点1整个屋顶是异型钢结构,拼装顺序 为栓...
2015年2月上 施工技术 第44卷第3期 CONSTRUCTION TECHNOLOGY 89 D0I:10.7672/5js2015030089 硅灰掺量对超硫酸盐水泥水化进程的影响* 向佳瑜,余保英,李红傲 (中建商品混凝土有限公司,湖北武汉430070) [摘要]通过设计3%,5%,8%,10%4种不同的硅灰掺量配制超硫酸盐水泥($C).对其胶砂试样的力学强度进 行了跟踪测试,并测试了试样自拌合加水后10h内的水化温升,借助扫描电子显微镜和X射线衍射分析仪对试样 水化产物进行分析,得出硅灰不同掺量下SSC的力学性能、水化温升及水化产物的差异.结果表明:硅灰在SSC中 掺量为3%~5%比较适宜,对S5C的力学性能和水化进程有促进作用;试样的水化过程最大的放热峰发生30~ 6Oh 随着硅灰的掺人,试样的最大水化放热峰提前;SEM和XRD分析结果显示硅灰填充于SSC之间,使胶凝材料 具有良好的级配和密实度,而且与SSC水化产物中少量的Ca(OH)2产生火山灰效应,提高了试样的强度. [关键词]建筑材料:水泥;超硫酸盐水泥;硅灰:水化温升;活性指数 [中图分类号]TU528.04 [文献标识码]A[文章编号]1002-8498(2015)03-0089-04 The Influence of Silica Fume Content for Super Sulfate Cement Hydration Process Xiang Jiayu Yu Baoying Li Hongao China Construction Ready Mixed Concrete Co.Ltd.Wuhan Hubei 430070 China) Abstract:Four different silica fume content (3% 5% 8%and 10%respectively)was researched for preparing super sulfate cement (SSC for short).The mechanical strength and hydration temperature rise of specimens were tested from mixing to 100h and the ponent of hydration products were analyzed by scanning electron microscope and X-ray diffractometer.Then the content differences of silica fume to effect SSC hydration reaction were obtained.Experimental results show that the proper content of silica fume in SSC system is 3%~5%which has a promoting effect on the mechanical properties and hydration process.The specimens hydration process maximum exothermic peak appear in 30~60h.The advanced exothermic peak occurred went with silica fume incorporation.SEM and XRD analysis ...
【关键词】地基;沉井;刃脚;极限承载力;滑移线;数值模拟 [中图分类号]TU753 [文献标识码】A [文章编号]1002-8498(2013)19-0056-05 Analysis of UltimateBearing Capacity of Ring Cutting Curb of OpenCaissonFoundationTread Xu Wei', Chen Zhiqiang',Xu Zanyun² (1.School of Civil Engineering,Tongji University,Shanghai 200092,China; 2.Jujiang Group Co.,Ltd.,Tongxiang,Zhejiang 314500,China) Abstract:This paper discussed the soil mobility trends under the cuting curb which flow to medial during open caisson sinking. Based on the Mohr-Coulomb principle,the finite difference method was applied to diserete the α and β family characteristics equation deduced from the slip line theory,authors obtained the difference formula in the axisymmetric limiting equilibrium condition and established the bearing capacity numerical model of cuting curb.According to the tread cutting curb boundary conditions, authors adopted Matlab software to analyze the ground ultimate bearing capacity and obtained the tread time, they analyzed the ultimate bearing capacity in diferent influencing factors. The tread ground ultimate bearing capacity and the measured results were pared. Key words: foundations; open caisson; cutting curb; ultimate bearing capacity; slip line; numerical analysis 1沉井技术概述 起着至关重要的作用,所以对沉井刃脚承载力进行 对沉井的定义有多种,但一般认为把不同断面 深入分析,意义重大。
施工技术 2011年6月上 62 CONSTRUCTION TECHNOLOCY 第40卷第342期 焊接应力对开洞钢板剪力墙极限承载力的影响 兰涛1,郭彦林2,郝际平,赵思远2 (1.西安建筑科技大学土木工程学院,映西西安710055;2.清华大学土木水利学院,北京100084) [摘要]钢板剪力墙在施工过程中,为保证安装精度及避免受力后产生的噪声问题,多选用焊接连接的方式,这将 导致内填板存在较大的焊接应力与变形.通过建立精细有限元模型,研究了焊接对钢板墙受力性能的影响.计算 结果表明焊接应力与焊接变形在设计中不可忽略.首先,以开边洞钢板墙为例具体分析了施焊顺序的影响.在得 到最佳施焊方案后对有、无焊接作用下开边洞钢板墙进行比较发现,考虑焊接影响时钢板墙的极限挑剪承载力与 结构延性均有所降低.最后通过分析开边洞钢板墙的潜回曲线与能量耗散系数指出,钢板墙在进人弹塑性阶段后 具有较好的耗能能力. [关键词]精细有限元模型;焊接应力与变形;开边洞钢板剪力墙;焊接顺序;能量耗散系数 [中图分类号]TU391.9 [文献标识码]A [文章编号]1002-8498(2011)11-0062-04 Influence of Welding Stress on the Ultimate Bearing Capacity of Steel Plane Shearing Wall(SPSW)with Opening Lan Tao' Guo Yanlin2 Hao Jiping' Zhao Siyuan2 (1.Shool of Civil Engineering Xi'an University of Architeeture and Technology Xi'an Shaanxi 710055 China; 2.School of Cisil Engineering Tsinghua University Beijing 100084.China) Abstract:Welding is a mon method during the construction of steel plane shear wall(SPSW)to ensure fixing precision and avoid the noise after loading.Meanwhile welding leads to large stress and distortion in filling plates.The authors build exquisite finite element models to study the welding effects on the behavior of SPSW.It indicates that the welding stress and welding distortion can not be omitted in design.Firstly taking for SPSW with opening as example the influence of different welding sequences is analyzed and pared to obtain the optimum one.By paring SPSW with opening and that without it is found that the ultimate bearing capacity and ductil...
施工技术 2012年10月上 68 CONSTRUCTION TECHNOLOGY 第41卷第374期 灰土挤密桩法和强夯法处理,湿陷性 黄土地基的效果对比 郭小云,王敏,闫嘉庆,相兴华,白晓红 (太原理工大学建筑与土木工程学院,山西太原030024) [摘要]为研究不同方法对湿陷性黄土地基的处理效果,结合平阳高速公路建设实例,介绍了灰土挤密桩法和强夯 法在湿陷性黄土地基处理中的应用,并且通过室内试验分析比较地基加固前后的物理力学指标变化值,对单击夯 击能为1000 2000kNm的强夯法和灰土挤密桩法处理湿陷性黄土路基的效果进行了对比.结果显示,这两种不同 能级的强夯处理和灰土挤密柱法都可以提高土体的物理力学性能、消除湿陷性,且2000kNm单击夯击能的强夯 处理效果最佳,灰土挤密桩法效果次之,1000kNm单击夯击能的强夯处理效果最不显著. [关键词]地基;湿陷性黄土;灰土挤密桩;强夯;试验 [中图分类号]TU411 [文献标识码]A [文章编号]1002-8498(2012)19-0068-04 Comparison of Effect of Lime-soil Compaction Pile and Dynamic Consolidation Method to Improve Collapsible Loess Ground Guo Xiaoyun Wang Min Yan Jiaqing Xiang Xinghua Bai Xiaohong College of Architecture and Civil Engineering Taiyuan University of Technology Taiyuan Shanxi 030024) Abstract:Based on Pingyang highway construction project the improving effects of three soil treatment methods such as lime-soil paction pile dynamic consolidation methods of1O0kNmand 2 000kNm were pared in this paper through contrasting the changes of soil physical and mechanica! indexes before and after treatment.Meanwhile the improving mechanics of either lime-soil paction pile or dynamic consolidation methods for collapsible loess ground were introduced and discussed.The laboratory test result showed that dynamic consolidation methods with1000kNmand2000kNmand lime-soil paction pile were all effective to improve collapsible loess'engineering property and decrease its collapsibility.Among these three methods the strengthening effec...
【关键词】加固;钢结构;火灾;二次受力;有限元法 [中图分类号]TU391[文献标识码]A[文章编号〕1002-8498(2014)04-0043-03 SimulationAnalysisonReinforcementofSteelColumn UnderAxialCompressionAfterFire Chen Jianfeng,Zhou Tianhua (School of Civil Engineering,Chang'an University,Xi'an, Shaanxi710061,China) Abstract;The method of increasing section was used to strengthen damaged steel column post-fire. The strengthening process was simulated with nonlinear finite element method and element birth and death technology by considering secondary load. The result showed that the strengthen plan is reliable and rational,and the performance differences between raw material and reinforcing material influence on the stability bearing capacity of steel column. In addition, the enforcing layer strain hysteresis is the main factor affecting the bearing capacity of reinforced members. Key words;strengthening; steel structures;fires; secondary load;finite element method 0引言钢材经历升温再降温,力学性能发生变化,尤其是 火灾使钢结构受损,经科学合理地评估鉴定弹性模量、屈服强度的下降会对构件乃至整体结构 后,对受损严重、承载力水平下降、可靠度显著降低刚度造成影响,导致钢结构稳定承载力下降。