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广州百货大厦新翼商业楼采用逆作法施工,利用大量钢管柱、钢构架柱和高强混凝土C60作为结构承重构件,在钢结构施工中主要对构件加工、构件进场和运输、现场吊装、钢构件的焊接、构件安装等施工工艺进行质量控制,高强混凝土施工中主要对吊装加固、混凝土制作、现场浇灌等施工工艺进行质量控制,适应了逆作法施工中对上下承重结构的要求,解决了大跨度和某些特殊结构的需要,减轻了结构重量,加快了工期;在减少柱截面同时大幅度提高了混凝土的承载能力,增大了商场使用面积,取得了良好的经济效果。 相似文献
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吴涛 《有色冶金设计与研究》2010,31(4):34-35,38
分析了结构延性在抗震设计中的重要性及其作用,探讨了影响结构延性的主要因素以及结构延性的抗震设计。事实证明,结构抗震的本质就是延性,提高延性可以增加结构抗震潜力,增强结构抗倒塌能力。 相似文献
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结构因耐久性不足而造成的危害尚未被人们完全认识,混凝土结构也需要进行积极防护的观念还没被人们所接受.本文通过某办公楼的结构加固与耐久性处理,进一步说明结构耐久性的重要性,并介绍了钢构套加固法与喷射混凝土加固法. 相似文献
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从产业布局、产品结构、技术结构和组织结构等方面对江西有色金属产业结构进行了分析,在此基础上提出了江西有色金属产业结构调整升级的思路和建议。 相似文献
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四钼酸铵的晶体结构及其控制 总被引:7,自引:7,他引:0
采用扫描电子显微分析方法对我国市售四钼酸铵及其衍生物钼粉进行了结构研究。结果发现,四钼酸铵和钼粉的微观结构可分为规则型和无规则型;其宏观结构则可分为团聚型和非团聚型。四钼酸铵的微观和宏观结构的不同支配着钼系产品的结构和性能。因此,建议四钼酸铵的质量标准应根据其微观和宏观结构来确定,用以代替或补充传统的质量标准。 相似文献
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轻型门式刚架厂房是目前单层工业厂房中一种常见的结构形式.其用钢量省、结构轻巧、适用范围广是此类厂房最主要的特点,因此,在轻钢结构厂房的设计中,为了充分发挥其优越性,结构工程师应尽可能地优化结构设计,从而达到“用钢量最省”这个目标. 相似文献
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介绍了弹簧式底吹氩装置的结构和失效原因,采用长行程全自动主动对接送气结构、全悬浮大偏移弹簧导向结构、耐高温软硬双重密封结构等改进方案,优化了钢包底吹氩自动对接装置的结构,提高了钢包底吹氩的可靠性和生产的安全性。 相似文献
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GS Ratnaparkhi S Ramachandran JB Udgaonkar R Varadarajan 《Canadian Metallurgical Quarterly》1998,37(19):6958-6966
The crystal structure of the C82A mutant of barstar, the intracellular inhibitor of the Bacillus amyloliquefaciens ribonuclease barnase, has been solved to a resolution of 2.8 A. The molecule crystallizes in the space group I41 with a dimer in the asymmetric unit. An identical barstar dimer is also found in the crystal structure of the barnase-barstar complex. This structure of uncomplexed barstar is compared to the structure of barstar bound to barnase and also to the structure of barstar solved using NMR. The free structure is similar to the bound state, and there are no significant main-chain differences in the 27-44 region involved in barstar binding to barnase. The C82A structure shows significant differences from the average NMR structure, both overall and in the binding region. In contrast to the crystal structure, the NMR structure shows an unusually high packing value based on the occluded surface algorithm, indicating errors in the packing of the structure. We show that the NMR structures of homologous proteins generally show large differences in packing value, while the crystal structures of such proteins have very similar packing values, suggesting that protein packing density is not well determined by NMR. 相似文献
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Stasz Cathleen; Shavelson Richard J.; Cox David L.; Moore Carol A. 《Canadian Metallurgical Quarterly》1976,68(5):550
Examined the effect of instruction on the correspondence between (a) a model of the structure of concepts in a social studies unit (content structure) and (b) a representation of psychological structure of Ss differing in field independence (FI) and dependence (FD). 98 high school students and 24 social studies teachers served as Ss. FI and FD were assessed with the Group Embedded Figures Test, portable Rod-and-Frame Test, and the Human Figure Drawing Test. When psychological structure was examined with multidimensional scaling of similarity judgments, at posttest it more closely resembled content structure than at pretest. Psychological structure of FI as compared to FD Ss resembled content structure more closely. The FD Ss' psychological structure was less differentiated. All differences between cognitive styles were consistent for both teachers and students. (20 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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Notes that recent theoretical and empirical developments indicate that the use of structure in initiating group work facilitates group development and client outcome. Three levels of structured learning exercises (initial structure, delayed structure, and no structure) were presented to 43 undergraduates meeting in interpersonal growth groups. The effects of structure on member anxiety, group cohesion, and quality of interpersonal interaction were assessed at 2 points during the life of the groups. Initial structure was associated with increased levels of self-disclosure in early meetings and higher levels of anxiety among members. The effects of levels of structure dissipated over time. Structure did not differentially influence group cohesion. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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论述了烧结布料铺底料装置的结构以及工作原理 ,调查分析了布料铺底料扇形闸门结构控制的原有缺陷 ,并对其进行了结构改进 ,使用性能得到改善 相似文献
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砖混结构房屋施工中容易发生的问题及解决对策 总被引:2,自引:0,他引:2
砖混结构是指小部分钢筋混凝土及大部分砖墙承重的结构。在砖混结构中加入构造柱和圈梁,能提高结构的抗震能力,但由于一些施工管理人员对构造柱的作用原理认识不清,施工中出现很多质量问题,使有些部位的构造柱和圈梁不但达不到抗震目的,反而影响了结构安全性。 相似文献
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文章讨论了设计结构是否适合用钢结构,结构选型与布置、预估截面、结构分析、工程判定、构件设计、节点设计及图纸编制八个方面的内容. 相似文献
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We integrate molecular dynamics simulation methods with a newly developed supersecondary structure prediction method and compute the structure of a protein molecule, crambin. The computed structure is similar to the crystal structure with an rms error of 3.94 A. 相似文献
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:制备了 YMn6 Sn6 - x Gax( x =0 .3,0 .6 ,0 .9,1.2 ,1.5 ,1.8)和 YMn6 Sn6 - x Tix( x=0 ,0 .2 ,0 .4,0 .6 ,0 .8,1.0 )化合物 ,通过 X射线衍射和磁性测量手段对其结构和磁性进行了研究 ,实验表明 ,所有这些化合物均为 Ca Cu5型六方结构。对 YMn6 Sn6 - x Gax 研究表明 ,晶格参数和晶胞体积均随 Ga含量的增加而线性减小 ,磁性测量表明 :当x≥ 0 .3时 ,化合物由反铁磁性转变为铁磁性或亚铁磁性 ,随 Ga含量增加 ,该化合物的居里温度先增高 ,在 x=0 .6达到最大值 ,然后居里温度又逐渐降低。饱和磁化强度开始随 Ga含量的增加而增大 ,当 x>1.2时 ,随 Ga含量的增加而减小。对 YMn6 Sn6 - x Tix 研究表明 ,晶格参数和晶胞体积均随 Ti含量的增加而线性增大 ,磁性测量表明 ,当 x≥ 0 .6时 ,化合物由反铁磁性转变为铁磁性或亚铁磁性 ,随 Ti含量增加居里温度 (或奈耳温度 )呈线性下降 ,饱和磁化强度开始随 Ti含量的增加而增大 ,当 x>0 .6时 ,随 Ti含量的增加而减小 相似文献