钢筋桁架双层钢板内填混凝土组合剪力墙高层结构抗震性能研究

在钢筋桁架双层钢板内填混凝土组合剪力墙抗震性能试验的基础上,利用有限元软件Perform-3D建立了能够合理反映钢筋桁架双层钢板内填混凝土组合剪力墙抗震性能的数值分析模型,通过对比试验数据验证了模型的合理性。然后以一框架-核心筒高层结构为研究对象,使用Perform-3D建立了带钢筋桁架新型组合剪力墙高层结构与普通组合剪力墙高层结构有限元模型,通过对比两模型在强震作用下的整体指标和材料损伤参数,评估钢筋桁架双层钢板内填混凝土组合剪力墙高层结构体系的抗震性能。研究结果表明,虽然钢筋桁架新型组合剪力墙结构的顶点位移和基底剪力相比普通组合剪力墙结构分别增大了16.59%和21.25%,但是剪力墙厚度可以降低,平均最大层间位移角减小了5.45%,且沿楼层分布更加均匀;在材料损伤控制方面,钢筋桁架新型组合剪力墙结构发生损伤剪力墙数量减少了88%,损伤程度降低到轻微损伤,说明钢筋桁架双层钢板内填混凝土组合剪力墙强震抗震性能更优,提高了强震作用下框架-核心筒高层结构安全。     

钢框架双钢板内填混凝土剪力墙有限元分析

钢框架双钢板内填混凝土组合剪力墙是一种新型的双重抗侧力结构体系。应用ABAQUS有限元软件,对试件进行有限元模拟,分析试件的滞回曲线、骨架曲线、刚度退化曲线来研究钢框架-双钢板内填混凝土组合剪力墙的受力性能;简单概述了钢框架双钢板内填混凝土组合剪力墙的影响因素。结果表明:试件的耗能能力较强,承载力高,抗震性能较好。     

双钢板组合剪力墙的抗震性能影响因素分析

双钢板-混凝土组合剪力墙是一种由外包钢板和内填混凝土组成的组合结构,它能结合钢板和混凝土两种材料的力学特性,具有高强度、高刚度、高延性、抗冲击性良好、和施工高效等良好性能特点。本文主要对国内外专家学者对该种类型的剪力墙研究成果进行归纳总结,并分析了影响其抗震性能的主要因素,主要包括连接方式、轴压比、混凝土厚度、混凝土强度、含钢率和钢板强度。以期为之后双钢板-混凝土组合剪力墙组合剪力墙的研究设计提供建议,促进其应用。     

钢框架内填预制钢筋混凝土剪力墙试验研究

为改进钢框架内填预制钢筋混凝土剪力墙的抗震性能,将耳板装置引入钢框架与内填墙的连接中.通过2个2层单跨钢框架内填预制钢筋混凝土剪力墙1/3模型试件的循环荷载试验,考察耳板连接装置的可靠性和内填墙裂缝的开展与结构变形能力,分析结构的破坏机理、滞回性能、刚度退化、变形及延性等,并对钢框架内填预制混凝土剪力墙体系与现浇混凝土剪力墙体系和带竖缝混凝土剪力墙体系进行对比.研究结果表明:抗剪连接件(U形筋)在梁柱节点上下耳板的帮助下未发生破坏,耳板连接装置具有可靠的工作性能;合理设计的钢框架内填预制钢筋混凝土剪力墙结构具有良好的延性.     

双层钢板组合剪力墙的抗震性能研究

利用有限元理论,对双层钢板组合剪力墙进行低周往复加载,考察了跨高比、内填混凝土板厚度、钢板厚度的变化对该种剪力墙抗震性能的影响,并得出相关结论。     

组合剪力墙的抗震性能有限元对比分析

基于有限元软件ABAQUS,通过分析带约束拉杆双层钢板-内填混凝土组合剪力墙的承载力,并与尺寸相似的传统剪力墙的承载力对比,对比研究了SCSW剪力墙的抗震性能。分析结果显示,SCSW剪力墙的承载力约是尺寸相似的传统剪力墙承载力的4倍,且其延性也明显优于传统剪力墙。     

双钢板-混凝土组合剪力墙研究新进展

进行了两组双钢板-混凝土组合剪力墙拟静力抗震性能试验,研究了该类结构的受力机理,并得到其典型破坏形态。试件均表现出良好的延性和耗能能力,滞回曲线饱满稳定,极限位移角均超过现行规范的规定限值,且大于其他类似试验的结果。缀板拉结措施可有效避免墙身钢板的局部屈曲,同时可加强对内填混凝土的约束作用,使高强混凝土在抗震剪力墙中的应用成为可能,从而很好地满足了超高层建筑结构对剪力墙高轴压、高延性、薄墙体的设计需求。在试验研究的基础上,开展了理论分析和数值模拟,对双钢板-混凝土组合剪力墙在工程中的应用提出了初步设计建议,对有待进一步开展的研究工作进行了展望。研究表明,双钢板-混凝土组合剪力墙具有延性好、耗能能力强、构造简单、施工方便、避免裂缝外露等优点,在超高层建筑结构中具有广阔的应用前景。     

平安金融中心钢-混凝土组合剪力墙设计分析

在钢筋混凝土剪力墙中两端设置型钢暗柱、中部设置钢板,形成钢-混凝土组合剪力墙结构,能充分发挥钢-混凝土组合结构优势,提高剪力墙承载力,减小截面厚度,改善结构抗震性能。采用有限元软件ABAQUS对平安金融中心核心筒区域钢-混凝土组合剪力墙进行了计算分析。结果表明,对于钢-混凝土组合剪力墙,只要构造设计合理,内埋的型钢、钢板与钢筋混凝土在达到极限承载力前是协同工作的。     

带暗柱的双钢板高强混凝土组合剪力墙抗震性能分析

双钢板高强混凝土组合剪力墙是由双层钢板内填高强混凝土构成的一种新型高层建筑抗侧力构件。本文进行了3个试件的低周反复加载试验,试件的破坏模式为钢板屈曲后混凝土压溃。试验结果表明双钢板高强混凝土组合剪力墙具有较高的承载力和良好的变形能力。在试验研究的基础上建立了有限元模型进行单调加载推覆分析,研究了轴压比、剪跨比、距厚比和配筋率等参数对剪力墙抗震性能的影响,最后推导了组合剪力墙的极限承载力计算公式。     

双钢板内填混凝土短肢组合剪力墙抗震性能试验研究

为了研究双钢板内填混凝土短肢组合剪力墙的抗震性能,进行了2层半单跨1/3缩尺试件的低周反复加载试验,分析了试件在循环荷载作用下的破坏机理、滞回性能、延性、刚度退化规律以及耗能能力。试验结果表明:双钢板内填混凝土短肢组合剪力墙滞回曲线饱满,耗能能力强,延性好,水平刚度较大;循环荷载作用下,连梁腹板首先屈服进入塑形,接着连梁两端翼缘、柱脚和剪力墙底部进入塑性;第2层连梁两端翼缘拉断,导致试件失效;剪力墙的线刚度远高于连梁的线刚度,水平荷载作用下连梁两端弯矩大,为结构的薄弱部位;为避免剪力墙自由边底部与梁连接部位发生破坏,在自由边处应设置边柱加强;试件达到峰值荷载时,顶点位移角为1/50;双钢板内填混凝土短肢剪力墙试件底层变形比2层小,耗能相对2层少;弹性范围内同一水平荷载作用下,连梁腹板的剪应变最大,边柱柱脚的正应变较大,剪力墙钢板的剪应变较小。ABAQUS 有限元分析结果与试验结果吻合较好。     

Multi-regional economic growth with public good and regional fiscal policies in a small-open economy

This paper is concerned with multi-regional economic growth with environment, capital accumulation and regional public goods. The economy has a fixed number of regions, and there are a production sector and a public sector in a region. The production sector provides goods in perfectly competitive markets. The public sector, which is financed by the regional government’s tax incomes, supplies regional public goods. The public goods affect both firms and households. We show the existence of a unique equilibrium in the dynamic system. We simulate the equilibrium of 3-region economy and examine effects of changes in some parameters on the spatial economy. The comparative statics analysis provides some important insights. For instance, as the technologically least advanced region (TLAR) improves its productivity or amenity, the national output and wealth are reduced, and more people are attracted to the region from the more productive regions. The labor forces in the TLAR’s two sectors are increased, and the labor forces in the other two regions are reduced. The change pattern for the capital distribution is similar to the change in the population distribution. The output levels of the two sectors in the TLAR are increased and in the other two regions are reduced. The TLAR’s total and per capita expenditures on public goods are increased; the other two regions’ total and per capita expenditures are reduced. The per-worker output level, wealth and consumption level per capita, wage rate in the TLAR are increased, and those variables in the other two regions are reduced. The lot size falls and the land rent rises in the TLAR, and the trends are opposite in the other two regions.     

河南嵩县双元沟铅锌矿地质特征及找矿方向

河南省嵩县双元沟铅锌矿位于华北陆块南缘外方山断隆带上,华北陆块南缘多金属成矿带的东段,黄庄—付店—土门钼铅锌银金成矿带内,矿体赋存于NE向或者与SW向构造带交汇处,呈脉状、透镜状;矿体形态、产状严格受断裂带控制,断裂交汇处为富厚矿体赋存的有利部位,矿床围岩蚀变较弱,铅锌矿以硅化、钾化为主,少量绿泥石化、褐铁矿化。钼铅矿以硅化、萤石矿化、碳酸盐化为主,次为锰矿化、黄铁矿化。为中—低温石英脉型铅锌矿床。     

陕南某锰矿工艺矿物学研究

陕西已探明锰矿储量位居全国第七位,主要分布在陕南地区。针对陕南某地的锰矿石进行了工艺矿物学研究。利用多种分析测试手段对矿石的化学成分、矿物组成、矿石的结构构造等进行了详细研究。该矿主矿体赋存于硅质板岩中。主要矿石矿物有含铁菱锰矿、褐锰矿、硬锰矿、软锰矿、针铁矿等;脉石矿物有石英、绢云母、白云母、石榴子石。矿石的结构构造较为复杂。详细的工艺矿物学研究为陕南某地锰矿石选矿工艺的选择和开发提供了理论数据。     

重庆龙湖·时代天街

该项目是重庆龙湖地产发展有限公司近年首推的商业地产类型项目,亦是重庆市目前体量最大的商业综合体项目。日本景观大师户田芳树先生的株式会社户田芳树风景规划研究所承担了该项目的景观规划设计,重庆蓝调负责该项目的深化及施工图制作。该项目位于重庆市渝中区大坪板块中心地带,其周边配套设施非常完善。然而,这种旧城中心却伴随着时代的发展逐渐没落,需要焕发新的活力、改善市民的生活品质。     

Heterotrophic and mixotrophic growth of Micractinium pusillum Fresenius in the presence of acetate and glucose: effect of light and acetate gradient concentration

The main objective of this study was to determine the importance of secondary mechanism of organic carbon utilization (mixotrophic and heterotrophic modes) in addition to CO2 fixation (photoautotrophic mode) in the green alga, Micractinium pusillum Fresenius (chlorophyta), isolated from a waste stabilization pond. The growth was studied in the presence of acetate and glucose. The incorporation rate of 14C- acetate was measured in the light and in the dark at different concentrations. Finally, in order to underline the role of photosynthesis and respiration processes in the acetate assimilation, the effect of two specific metabolic inhibitors, a specific inhibitor of photosystem II (DCMU) and an uncoupler respiratory (DNP), has been studied. The obtained results showed that M. pusillum grows in the presence of organic substrates, i.e., glucose and acetate, in the light (mixotrophic growth) as well as in the dark (Heterotrophic growth). The growth was much more important in the light than in the dark and more in the presence of glucose than of acetate. In the light, the presence of acetate led to a variation of growth parameters mumax, iotaopt, and beta. The effect of acetate gradient on the growth of the microalga was severe as soon as its concentration in the medium was higher. The acetate uptake followed a Michaelis-Menten kinetic in the light as well as in the dark. The capacity of assimilation was slightly higher in the dark. The utilization of DNP and DCMU indicates that acetate incorporation is an active process depending on both anabolic (photosynthesis) and catabolic (respiration) metabolisms, corroborating the model of the Michaelis-Menten kinetic.     

潍坊市峡山水库、白浪河水库藻类种群变迁特征研究

针对潍坊市峡山水库、白浪河水库中的藻类进行了监测.结果表明,这两个水源地的藻含量随季节变化特征比较明显.在水温较低的春季和冬季,藻类数量较少,峡山水库藻类种类以裸藻、绿藻、硅藻占优势,白浪河水库藻类种类以金藻、绿藻、硅藻占优势;在水温高的夏季和秋初,藻类大量繁殖,蓝藻成为两个水库的优势种群,白浪河水库水质状况相对较好,峡山水库出现水华.     

江西省市级麻风病防治机构服务能力的调查分析

目的了解江西省市级麻风病防治机构服务能力的提升情况,为今后健全和完善市级麻风病防治机构服务能力提供科学依据。方法采用普查的方法进行调查。同时对2010年江西省3所地级市麻风病防治机构采用自制的江西省市级麻风病防治机构卫生服务能力建设工程终期调查表进行调查。用描述性统计指标对2010年江西省市级麻风病防治机构服务能力情况进行分析,并与2007年的数据进行比较。结果 2010年3所江西省市级麻风病防治机构的房屋建筑、业务用房平均面积分别为3 904.00、3 644.00m2,较2007年增加了1.41%、0.51%。2010年3所江西省市级麻风病防治机构的平均设备装备台数、万元以上设备台数、50～100万元以上设备台数均有所增加,基本设备配置率由2007年的75.00%上升为2010年的87.50%。2010年平均收容病人总数为11.50人,比2007年减少了40.50人;2010年平均现症病人数为10人,比2007年现症病人数减少了33.33人;平均新发病人数由2007年的9.67人降为2010年的0人;平均复发病人数也由2007年的2.67人降为2010年的0人;平均病人死亡数、其他减少病人数、联合化疗的规则人数也均呈现出下降的趋势。2007年平均现症和愈后人员中Ⅱ级畸残人数、现症和愈后人员中不能生活自理人数由58.33人、32.33人上升为2010年的88.00人、47.50人;开展麻风病健康教育次数由2007年的21.33次上升到2010年的42.50次。结论江西省市级麻风病防治机构的基础设施情况得到改善,设备配置率有所增加,服务能力有一定的提升,但麻风病的防治任务仍较艰巨。     

青海都兰县三通沟北地区锰矿地质特征及找矿前景

青海省都兰县三通沟北地区锰矿是东昆仑地区近年发现的一处海相沉积型锰矿,区内目前共发现5条锰矿化带,334矿石资源量482.48万t。锰矿体均位于中-新元古界万宝沟群碎屑岩组中,赋矿岩性为泥钙质粉砂岩,矿石类型主要为菱锰矿,少量褐锰矿,矿体明显受地层控制,走向及倾向上均较为稳定,但后期受到了辉长岩侵入体的不同程度破坏。本文通过对该锰矿体地质特征、控矿因素、矿床成因及找矿标志的研究探讨,认为该区及其周边的万宝沟群碎屑岩组具有较好的锰矿找矿前景。     

Influences of the train-wind and air-curtain to reduce the particle concentration inside a subway tunnel

Subways are used widely for public transportation in major cities and require efficient ventilation systems to maintain indoor air quality in the subway tunnel. A subway tunnel was investigated numerically and experimentally to reduce the particle concentration in subway tunnels. The subway tunnel is 54-m long, 1.65-m high, and 2.5-m wide. The subway tunnel is one-quarter scale of a real subway tunnel. The tunnel has two U-type mechanical ventilation shafts. The steady three-dimensional airflow in the tunnel was analyzed using ANSYS CFX software to solve the Reynolds-averaged Navier–Stokes equations. The airflow in the tunnel and shafts was observed numerically using the train-wind and air-curtain. The effects of the train-wind, air-curtain, and electric precipitator were examined experimentally. The ventilation performance in the subway tunnel was observed with respect to the particle concentration in the tunnel. The numerical results suggest proper operating conditions for experimental analysis of the particle concentration. The average velocity of the airflow increases in the shaft when the velocity of the air-curtain increases. The particle concentration at the dust monitoring device after ventilation shaft 1 was reduced significantly in the tunnel when the air-curtain and train-wind were operated.