2014 volumne 35卷 Issue 06
LIU Min-shan,XU Wei-feng ,JIN Zun-long,WANG Yong-qing,WANG Dan
Abstract: A numerical simulation of trisection-ellipse heat exchangers with helical baffles is carried out, andthe helix angles are 15° and 20° respectively , and we studied the impact of triangle leakage between continu-ously overlapped and adjacent baffles on heat transfer and resistance performance of heat exchangers.Throughthe comparative analysis about the simulation results of existing triangle leakage and that of blocking trianglearea without leakage , the results show :triangle leakage makes a more serious short circuit flow for the shell-si-ded fluid;Triangle leakage makes heat transfer coefficient,shell-sided pressure drop and comprehensive per-formance of heat exchanger reduce. When triangle leakage is blocked,heat transfer coefficient increases by8.5% ~ 11% , shell-sided pressure drop increases marginally , comprehensive performance increases by 8.1 %~11 . 1 % .
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RONG Xian1,2 ,SONG Peng1,ZHANG Jian-xin’,LIU Ping1,2
Abstract: Based on the quasi-static test study of seismic performance of HRB500 reinforced concrete piers ,influence law about steel strength ,the spacing,the axial compression ratio on seismic behavior was obtainedaccording to the analysis of its failure characteristics, hysteresis curves,skeleton curves,stiffness degradationunder low eyclic loads. The results show that increasing steel strength can improve components’ bearing ca-pacity and deformation capacity obviously , stirrup ratio can not influence members’ bearing capacity and de-formation capacity ,axial compression ratio can improve components’bearing capacity , but on the other hand,it is useless to improve components’deformation capacity.
Cong Pei-LIANG 1,2, LIU Jian-fei 1,2, ZHAO Zhi-qiang 1,2, Chen Muan-Fa 1,2
Abstract: Aiming at the application of epoxy asphalt in concrete bridge pavement, epoxy asphalt was prepared. The effects of different resin content on viscosity, high and low temperature properties of epoxy asphalt bond, mechanical properties, low temperature crack resistance and high temperature stability of epoxy asphalt mixture were studied.The results show that the addition of epoxy resin can improve the road performance and mechanical properties of asphalt mixture. With the increase of the addition amount, the curing reaction process of epoxy asphalt is accelerated, the high temperature performance and fatigue resistance are enhanced, the stiffness modulus is increased, the creep rate is decreased, the low temperature crack resistance is decreased, and the fatigue resistance and high temperature stability of asphalt mixture are improved.By comprehensive analysis,30% is the best dosage of epoxy resin.
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