Archive

15 March 1994, Volume 13 Issue 1 Previous Issue    Next Issue

---

For Selected:

Download Citations EndNote Ris BibTeX

Toggle Thumbnails

Select

Creep and Shinkage Analysis of Reinforced Con crete Composited Arches of Stiffen Framework Liu Zhong, Gu Anbang,Fan Lichu 1994, 13(1): 2-9.  Abstract ( )   In this paper,a new method of determining the stress distriution in cross-seetion has been used to anal- yse the stiffen franeword arches in whieh the concrete laycrs are cast in place layer upon layer at the differ- ent time. A recurrence algorithm is cmployed using Dirichlet series instead of creep and shrinkage func- tions in the Brideg Code. For composite concrete-conerete and sreel framework seetion members,another method for the calculation of the equivalent creep and shrinkage loads has been presented By these methods, the strucnre can be analysed in micro-computer.In comparison with other methods,some conclusions have been drawn.? References | Related Articles | Metrics

Select

A study on Vibration Induced by Vortex of Two-cable Installed Along Wind of Cable Stayed Bridgf Dong leshan,Tian weiping 1994, 13(1): 10-13.  Abstract ( )   PDF (200KB) ( )   This papor engaged thcoretical analysis and experimemtal test on interaction of two-cable installed along wind while cables of cable stayed bridge were vibrating induced by vortex. The study shows that the down- stream-cable which was locatde in the wake region of the upstream-eable could not vibrate with a large ampli- tude while the distance of two-cable L≤5D(D=cable diameter);But the down stream-eable has an amplig- ing effect on the vibration induced by vortex of upstream-eable while L=(4-6) D. This conclusion furnish- es reliable and useful reference data for arranging cables of eable stayed bridges. References | Related Articles | Metrics

Select

Anchorage Stress Analysis of OVM Anchor of 4500kN Yin dingan 1994, 13(1): 14-23.  Abstract ( )   PDF (481KB) ( )   OVM anchor is a new generation of multianchor syslem. it is divided into two models of OVM 15 and OVM 13 and suitable for 15.2,15.7,12.7,12. 9 high strength steel strand wires whieh have the anchor standard strength of 1770 MPa-1860 WPa,and the tensile force ean be seleeted freely over 160kN. Now the maximum tensile force used in our country is 4444.9kN. This article uses the finite element method of PAFEC-FE to analyse the anchor stress of 4500 kN,and gives the datas and the state of distribution of the threc-dimentional stresses of anchorage zones and some of the conclusions. Finaily,it makes some discussions about the conditions concerning bearing strength in Bridge code (JTJ 023-85).? References | Related Articles | Metrics

Select

Live Load Moments in Slab Bridges Hu Zhengyi, Jiang Zhigang,Xiao Jianxiong 1994, 13(1): 24-29.  Abstract ( )   In ordcr to take into aeeount the influence of the curb stiffness,a calculation scheme for slab with edge beams is proposed in this paper fur analyzing the moments in slab bridges.Exampls demonstrate that the curb stiffness makes the longitudinal moments deercased in slab bridge and the transverse moments inereased. References | Related Articles | Metrics

Select

New Stress Intensity Factor Expressions For TwoKinds of Cracked Strips BiaslyLoaded by Point Forces Wang Qizhi 1994, 13(1): 30-34.  Abstract ( )   PDF (241KB) ( )   New sttess intensity factor expressions for two kinds of cracked strips biasly loaded by point forces areobtained uatns the crack-line stress field method for analysing stressin tensity factors of finite-width strips.The resuit for the centrally cracked strip compares well with the result from the popular handbook, while thatfor the eccentrically cracked strip constitutes a supplemental solution for the handbook.? References | Related Articles | Metrics

Select

Convex Analysis of Statically Indeterminate stresses Li Youxing 1994, 13(1): 35-40.  Abstract ( )   PDF (298KB) ( )   In this paper,the in terseetion of cunstitutive set and geometrical set is first found,then from this,the intersection with equilibrium set.This is a method of convex Analysis in solving the Priblems of conditional extreme value for convex Programming.Statically indeter minate streses,which have a power fumction rela- tion of stress and strain,are determined by means of this method in this paper.Examples show that the results are coincided well with other methods and this method is available for practioe.? References | Related Articles | Metrics

Select

Model and Analysis of Freeway Trafeic Flow Yang Lei 1994, 13(1): 41-50.  Abstract ( )   PDF (427KB) ( )   This artiele dcals with the model of frceway traffic flow. We set up in this article the nonlinear-dis-crete-dynamic traffic flow model and optimization analysis model of freeway traffic flow.We also created two kinds of optimization objeetive functions in dctail at rush hours and non-rush hours, and diseussed the teehnique of parametric inference in the models.At last,We calculated actually freeway states from Xian to Ling tong both at rush hours and non-rush hours. References | Related Articles | Metrics

Select

Finite Element Method of Joint Concrete Pavement on Multilayered Elastic System Huang Xiaoming 1994, 13(1): 51-57.  Abstract ( )   PDF (402KB) ( )   A finite element method of joint conerete pavement on multilayered system is presented in this paper,which is besed on multilayered theory and elastic plate theory. A program named CELA is developed.In theprogram, the simplified matrix method and aggregration method are used.The method presented in this papercan be used to analyze the states of stresses and loaltransfer capaeity. References | Related Articles | Metrics

Select

Characteristcs of Flow Exerted by Hooked Groin Cheng Changhua, Liu Jianxin, Xu GuangXiang 1994, 13(1): 58-69.  Abstract ( )   PDF (651KB) ( )   Based on the model of hooked groin,the flow characteristic,which is dcfferent from non- composite groin,is studicd,It showcs that flow pattern varies with the different combinations of hooked lengthes and booked angles aeeording to the submerged and non-submerged conditions.The tesults could be useful for the design of river and waterway regulation engineering.? References | Related Articles | Metrics

Select

Diversion Discharge Calculation for Bifurcated River Stretch Xie Shengming 1994, 13(1): 70-76.  Abstract ( )   PDF (319KB) ( )   In this paper, the hydraulic calculation for bifurcated river streteh includes the determination of the water surfaee Proflle and its eorresponding diversion discharge of each branch.The solution is based on the fol- lowing principle that the backwarer height for the left or right branch is equal to the other.Thus,to examine the rate of the diversion disoharge for branches and the point positions of the diversion after regulation is nec- essary. A computer programe has been made for this process.Many of the results one of them comes from Xian- glu hazard reach of the Yangtzc River have proved that the programe is correct.? References | Related Articles | Metrics

Select

Experimental Investigation of Developing 55 MPa High Strength Concrete With # 425 Cement Xiong Guangze 1994, 13(1): 77-85.  Abstract ( )   PDF (495KB) ( )   he results of experimental investigation and their corresponding technical menthod of developing 55 MPahigh strength concrete with # 425 cement have been givcn in this paper.The advantages of this menthod arethat the raw materials are casy to be obtained and the relevant teehnological proeess is simple and applicable.? References | Related Articles | Metrics

Select

Geomorphologic Studies on Landslide Developmnt In Boundary Area of East Qinghal-xizang Plateau(Taking Douyapeng landstide as a example,wanxian) Chen Hongkei, Tang Hongmei, Wang Jianpin 1994, 13(1): 86-93.  Abstract ( )   PDF (462KB) ( )   Larger landslides,developing in the boundary area of east Qinghai-Xizang plateau,have a direet bearing on zonal geomorphologie stress field in some extent.This paper discusses the relationships between landslides and geomorpholgy based on field investigations and analyse in home taking Douyapeng landstode as a example.It is important to providc the spinning uphcaval model of Qingkaj-Xizang p ateau,whieh ean explain reasonlythe formation and distribution of zonal stress field of the boundary area of east or all Qinghai-Xizang plateau.Generally,main moving direetions of many large landslides are eonsistent with either main oriention or shearbelt of the stress field Douyapeng landslide belongs to a larger landslide with two slide planes(the up one andthe down one).The up one is made gy mankind engineering aetions,and the down one is eontrolled by the zon-al stress ficld. valuablly,NE29°30′, chieffy moving direction of the landshde,is consistent with basis of drillresrlts,it is sure that the landsliole, develping late Quaternary,is consist of loose soils or earth and has clearcreep strain. we study the interest inthe paper for mankind actions to trigger the landslids too,and eoneludethat slope excavation、slope load and rich underyrourd water are the basic features for urban geomorpholyicproeess to cvaluate.The administration measures must be therefore syntheiical ones with engineering manner、governing water and adminestering way,whieh also be the general prineiples for Mt.city unstable slope to beruled.? References | Related Articles | Metrics

Select

Improving Marking-Accuracy of Measuring Transducer Zeng Hanchuan 1994, 13(1): 94-102.  Abstract ( )   PDF (507KB) ( )   Effective and reliable measuring technology is the frist and necessary eondition of scientific research and automatic production. This paper discusses a few examples about marking error of non-eharged electrie measur- ing transducers and analyzes the influence of marking error on transducer aceuraey,and presents some methods improving aceuracy of transducers.? References | Related Articles | Metrics

Select

Strength Analysis of Spot Welded Structures by Fem Zheng Zhaoyun 1994, 13(1): 103-110.  Abstract ( )   PDF (412KB) ( )   This paper discusses how to model various kinds of spot wclded joints for their strength analysis by FEM. References | Related Articles | Metrics

Select

Solutions of Diopliantine Congrucnce Equation x2n+(x+1)2n+…+(x一h)2n≡(x+h+1)2n(mod 17)(Ⅱ) Zou Zhaonan,Chen Julin 1994, 13(1): 111-119.  Abstract ( )   PDF (381KB) ( )   In this paper, wc prove that fur the diophantine congruence equation x2n+(x+1)2n+…+(x+h)2n≡(x+ h + 1)2n(mod 17)there are integer solutions if and only if(1)when n≡4(mod 8),(mod 17):(2)when n≡5 (mod 8)(mod 17):(3)when n≡6(mod 8)(mod 17);(4)when n≡7(mod 8)(mod 17) References | Related Articles | Metrics

Select

Carrying out of Procedure Arrangement of n Piecefs of Works on M Machine Tools by Microcomputer liu Quanli 1994, 13(1): 120-126.  Abstract ( )   PDF (288KB) ( )   A reasonable procedure arrangement must be made to save the time for processing while a large quantity of works are proeessed on a certain number of machine tools.Johyson and Bellman managed to process N picccs of work on 2 machine tools.Here,We spread to carry out the procedure arrangement of N pieces of work on M machine tools by microcomputer in BASIC LANGUAGE.? References | Related Articles | Metrics