泡沫沥青冷再生半柔性基层性能研究

采用旧沥青路面铣刨混合料,用泡沫沥青和水泥复合作再生稳定剂进行现场冷再生碾压成型形成半柔性基层。从材料的选取与级配的组成、沥青的发泡条件、油石比出发,研究了泡沫沥青的发泡性能和泡沫沥青冷再生基层的物理性质和强度特性。试验得到了沥青的最佳发泡条件和混合料的最佳含水量和最佳油石比,表明其强度能够满足路面设计规范关于基层设计参数的要求。     

碎石化技术的特点与工艺分析

碎石化处理技术在损失混凝土板的一定结构强度和整体性的条件下,有效地消除了水泥路面改造中的反射裂缝,同时具有施工速度快、交通干扰小、费用节约、有利于环保等特点。随着碎石化处理技术的不断完善．其在未来水泥路面“白改黑”工程中会得到广泛的应用。     

Travel Behavior Analysis of the Females in Beijing

In urban life, compared with the same age group of male contrast, the statistical indicators of female travel behavior show significant differences. According to the sample data of Beijing 2005 travel survey, the paper analyzes the female travel behavior in the travel rate, travel consumption, trip purpose, and travel mode. Furthermore, the paper introduces the concept of the trip chain, to construct a female morning commuter trip chain choice behavior model with noncollection theories and methods, to analyze 10 factors that influence a female individual's choice of a trip chain from the source. Subsequently, model parameters are estimated, to calculate the incidents that can help to quantitatively understand the impact of each factor on a female's choice of the trip chain. The results show that the travel rate of elderly women is far lower than that of elderly men. Female travel proportion in shopping and social activities is obviously higher than that of male travelers, and factors related to the structure of families create important constraints in their average travel time consumption. The main travel mode of the female is walking, which is far more than that of a male. Age, whether they hold licenses, monthly income, and transport ownership are dominant factors for the female's choice of the trip chain.     

In-plane Auto-Parametric Vibration of Inclined Cables under Random Transverse Excitation

In-plane auto-parametric stochastic vibration of inclined cables subjected to Gaussian white noise in transverse bridge orientation is investigated. Based on Newton＇s laws of motion and Galerkin＇s modal truncation principle, the influences of geometry nonlinearity induced by sag and large displacement of cables and the initial equilibrium state are taken into account. Meanwhile, the three-dimensional non-linear differential equations of inclined cables for coupling vibration are deduced, equivalent stochastic linearization method is applied to derive the 14-dimensional first-order nonlinear differential equations of state vectors, and the Runge-Kutta integration method is utilized to obtain the root mean square （RMS） response. Results show that when the transverse random excitation imposed on the stayed cable exceeds a critical value, the in-plane transverse vibration of the cable are excited due to tim auto-parametric nonlinear coupling, and the critical value of random excitation increases with the damping ratio. In this motion, the cable response possesses non-stationary characteristics, even though the loading keeps stationary.     

新自适应方式双倍体遗传算法求解作业车间调度问题

综合了双倍体遗传算法和自适应遗传算法的优点,提出了一种基于新自适应方式的双倍体遗传算法.该算法利用双倍体遗传算法良好的记忆及环境适应特性来保持个体的多样性,同时引入黄金分割率的自适应公式来快速寻找最佳自适应点.经理论分析和试验结果表明,该算法在寻优能力上具有明显优势,能够显著提高搜索效率,改进收敛性能.     

创和谐交通艮务“宜居、宜业、宜游”新秦皇岛

“宜居、宜业、宜游”是秦皇岛市从实际出发、创造性地提出的全新的城市发展定位,创和谐交通对于秦皇岛市实现这一城市定位具有十分重要的意义。     

钻孔灌注桩施工要点及质量控制措施

钻孔灌注桩作为桥梁重要的传力和承载结构,其工程质量直接影响着桥梁的安全和寿命,通过工程实例详细介绍钻孔灌注桩的质量控制措施,以及其安全文明施工要点,可为今后钻孔灌注桩的施工提供参考。     

深圳地铁5号线竖井施工技术

针对深圳地铁5号线深圳北站~民治站区间暗挖隧道临近平南铁路安全防护施工难度大的特点,详细的介绍了不同地质岩层段竖井施工方法,为地铁类似工程施工与设计提供借鉴。     

Eu（DBM）_3Phen/PS复合纤维的制备与发光性能

采用静电纺丝法与无皂乳液法相结合制备了稀土配合物/聚合物复合纳米纤维Eu（DBM）3Phen/PS.采用扫描电镜（SEM）、红外光谱（FT-IR）和荧光光谱（FS）等,对纤维的形貌和发光性质进行了表征.实验结果表明,随着PS浓度的增加,所制备的纤维直径逐渐增大,纤维的发光强度也逐渐递增,荧光寿命逐渐增长.     

公路隧道衬砌火灾后力学行为分析

公路隧道发生火灾后,衬砌结构将发生物理与力学性能的改变,如厚度变薄和弹模降低等。首先分析混凝土构件在火灾后的损伤机理、力学特性和耐火性能,然后根据混凝土火损等级,进一步研究衬砌结构厚度与弹性模量的变化对衬砌结构体系的影响。采用荷载-结构法分析超高次公路隧道结构体系在火损后的力学行为,探寻其残余承载能力及内力与变形规律,找出特征破坏点与破坏机制。