Qian Jueshi , Fan Yingru , Yuan Jiang
1995, 17(2):1-8. DOI: 10.11835/j.issn.1674-4764.1995.02.001
Abstract:This paper ainalyses the size effect of the fracture energy of concrete tested bythree point bending. It is shown that positive errors of test results of fracture energy increase,ornegative errors decrease with increasing of the specimen ize. The phenomenon is one of main causesresulting in the size effect of fracture energy.
1995, 17(2):9-14. DOI: 10.11835/j.issn.1674-4764.1995.02.002
Abstract:石膏基外墙为刷材料是一种以A2石膏为石膏基材,矿渣改性的耐水性良好的新型外墙粉刷材料。本文采用XRD、SEM、孔结构分析、并结合宏观试验结果,从水化物相、孔结构、硬化体微结构、亲水性等方面对SVF耐水性机理进行了分析研究。
1995, 17(2):15-22. DOI: 10.11835/j.issn.1674-4764.1995.02.003
Abstract:This paper studies an effect of high loads in Rayleigh distribution random load-ing on fatigue crack growth wi th 16 Mn steel compact tenion specimen,The results show that thehigh loads in the load spectrum close to service load of steel bridges accelerate crack growth and re-duce crack growth life,Lives predicted with constant amplitude da/dn data and equivalent loads arequite in agreement with test lives.
1995, 17(2):23-30. DOI: 10.11835/j.issn.1674-4764.1995.02.004
Abstract:This paper presents a method to solve smoke fow in building on the basis ofprincipies of graph theory. According to this method,the pressure and rate of smoke flow of everyroom and passageway in different times can be worked out simultaneously,The method is successfulin calculating ventilation and smoke flow.
1995, 17(2):31-40. DOI: 10.11835/j.issn.1674-4764.1995.02.005
Abstract:Relying on the mathematical model of fuzzy comprehensive estimation of con-struction sclieme optmization,comprehensive evaluation coefficient of every scheme can be figuredout with the auther's computer program in order to get optimal solution. This paper presents themethod of doing reliability analysis to optimal solution.
1995, 17(2):41-44. DOI: 10.11835/j.issn.1674-4764.1995.02.006
Abstract:The carbonation of the concrete in the air is an unavoidable natural process,Itmakes the volume and strength of the concrete change and the alkality reduce,So the structure in-side concrete and the durability both become worse. The carbonation resistance of the autoclaved sil-icate concrete is tested by the means of speeding up the carbonation artificially and also with the ex-periment of the natural carbonation for 6 years. It is very good for recognizing it correctly andspreading.The carbonation of the new concrete material is discussed.
1995, 17(2):45-51. DOI: 10.11835/j.issn.1674-4764.1995.02.007
Abstract:In this paper,the comparative experimental research that air flows through theout-surface of a single row finned tubes is done in a drawing wind tunnel and the three differnetshapes of rectangluar finned tubes are compared with a plain finned tube that is usually used in therefrigerant heat exchanger, the useful results are obtained. The results show that,in the range ofwind velocity flowing through the marrowest area, W_(max)=2.5m/s to 8.5m/s,the average convec-tion heat transfer coefficient of the two-side V-groove finned tube is higher than that of rectangluarplain finned tube,It is a new type finned tube that has good heat transfer performance and it isworth poplarlzing.
1995, 17(2):52-57. DOI: 10.11835/j.issn.1674-4764.1995.02.008
Abstract:This paper studies the determination of a crack in steel fibre reinforced lime-sand concrete and its precision by acoustic emission(AE).The main AE paramters which influencethe precision of the determination of a crack are introduced,The properties of the lime-sand concretecan be increasted greatly with the steel fibre,The result in this paper can be used in the study of fi-bre re inforced cement concrete.
Zhang Zanxun , Fu Linsen , Yao Jinshi , Wang Dongyun
1995, 17(2):58-62. DOI: 10.11835/j.issn.1674-4764.1995.02.009
Abstract:The carved sandstone of Dazu county in Sichuan is a stratum under the Pen-laizhen group of late Jurassic. This sandstone is similar to seme typical character of arkcoe in compo-sition and structure of the corrosive cementation. The weathered damage of the carved stone art hasa relation to degenerative after-change process of sandstone.
1995, 17(2):63-66. DOI: 10.11835/j.issn.1674-4764.1995.02.010
Abstract:选用1.5次微分伏安法和循环伏安法对鸟嘌呤在碳纤维微电极上的电化学行为进行了研究。
1995, 17(2):67-71. DOI: 10.11835/j.issn.1674-4764.1995.02.011
Abstract:According to the proporties of mechanisms in different working orders,this pa-per provides the load-time function by dynamic view. The input excitation is useful for the study of tower crane dynamic-state,and true for selution of tower crane dynamic equation. The view andway in the paper have the meaning of theory and practice for other engineering machinery
1995, 17(2):72-77. DOI: 10.11835/j.issn.1674-4764.1995.02.012
Abstract:This paper presents the formula of sunshine duration in those plaees where sun-shine duration is more than seventy per cent. This formula is obtained from the sunshine obeervationrunning at seven obeervation stations of China for five years. And after analysing the changes oftime and place, this formula is very precision.
1995, 17(2):78-85. DOI: 10.11835/j.issn.1674-4764.1995.02.013
Abstract:This paper presents some principles and methods which work out schedules witha network program system for large-scale or middle-sized construction projects. These projects arelarge in scale,complicated in structure and long in construction time.Tese ways will control con-struction projects effectively and guarantee to bring about schedules.
1995, 17(2):86-90102. DOI: 10.11835/j.issn.1674-4764.1995.02.014
Abstract:This paper presents the proporties of drainage system and the form of drainagesystem and analyses the drainage system of highrise residential and hotel buildings. The results of re-search show that it is suitable to adopt separate systeni when highrise residential and hotel buildingsare not more than twenty floors. It is feasible and economic to adopt the complementary wet ventdrainage system rather than the three-pipe system when the diameter of vertical drain is 100 mm.
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