桂柳一级公路K250段边坡变形原因及加固措施

Ｋ２５０段边坡变形的原因是老滑坡的影响，降雨诱发，削坡不当及抗滑桩桩长不足，桩位欠合理等。可采用削坡、排水和再加抗滑桩对该边坡进一步加固。     

公路工程项目风险管理初探

我国公路建设项目前期工作中风险管理是一个比较薄弱的环节，针对此情况，本文就公路工程风险管理的理论和实践问题作了初步探讨，希望通过对公路项目的风险管理，为项目科学决策提供一些依据。     

区域路网新建公路转移交通量预测方法研究

提出一种基于现状路网路段交通量来预测新建公路转移交通量的预测方法。该方法分为3个步骤：确定路段的交通阻抗；找出与新建路有竞争关系的最短路径及次短路径；确定节点之间的出行量、分配并汇总转移交通量。     

高架桥横向地震反应参数分析

建立了高架桥双自由度体系横向地震反应的计算模型以及运动方程,利用解析方法及数值分析方法对城市高架桥结构横向地震反应参数进行了比较分析.阐述了阻尼比、质量比、刚度比以及扰动频率等参数对桥墩振动反应的影响规律.结果表明:主梁与桥墩的质量比对桥墩振动的影响较小,适当增加阻尼比及支座的刚度可以减小桥墩的振动反应.     

Wheel Load Distribution in Simply Supported Concrete Slab Bridges

This paper presents the results of a parametric study related to the wheel load distribution in one-span, simply supported, multilane, reinforced concrete slab bridges. The finite-element method was used to investigate the effect of span length, slab width with and without shoulders, and wheel load conditions on typical bridges. A total of 112 highway bridge case studies were analyzed. It was assumed that the bridges were stand-alone structures carrying one-way traffic. The finite-element analysis (FEA) results of one-, two-, three-, and four-lane bridges are presented in combination with four typical span lengths. Bridges were loaded with highway design truck HS20 placed at critical locations in the longitudinal direction of each lane. Two possible transverse truck positions were considered: (1) Centered loading condition where design trucks are assumed to be traveling in the center of each lane; and (2) edge loading condition where the design trucks are placed close to one edge of the slab with the absolute minimum spacing between adjacent trucks. FEA results for bridges subjected to edge loading showed that the AASHTO standard specifications procedure overestimates the bending moment by 30% for one lane and a span length less than 7.5 m (25 ft) but agrees with FEA bending moments for longer spans. The AASHTO bending moment gave results similar to those of the FEA when considering two or more lanes and a span length less than 10.5 m (35 ft). However, as the span length increases, AASHTO underestimates the FEA bending moment by 15 to 30%. It was shown that the presence of shoulders on both sides of the bridge increases the load-carrying capacity of the bridge due to the increase in slab width. An extreme loading scenario was created by introducing a disabled truck near the edge in addition to design trucks in other lanes placed as close as possible to the disabled truck. For this extreme loading condition, AASHTO procedure gave similar results to the FEA longitudinal bending moments for spans up to 7.5 m (25 ft) and underestimated the FEA (20 to 40%) for spans between 9 and 16.5 m (30 and 55 ft), regardless of the number of lanes. The new AASHTO load and resistance factor design (LRFD) bridge design specifications overestimate the bending moments for normal traffic on bridges. However, LRFD procedure gives results similar to those of the FEA edge+truck loading condition. Furthermore, the FEA results showed that edge beams must be considered in multilane slab bridges with a span length ranging between 6 and 16.5 m (20 and 55 ft). This paper will assist bridge engineers in performing realistic designs of simply supported, multilane, reinforced concrete slab bridges as well as evaluating the load-carrying capacity of existing highway bridges.     

Strategic Interactions of Bilateral Monopoly on a Private Highway

This paper investigates strategic interactions between a private highway operator and a private transit operator who uses the same highway for its services. Heterogeneity of travellers is taken into account by considering a continuous distribution of values of time. Demand elasticity arises from the inclusion of an outside virtual mode. Game theory is applied to model the possible moves taken by the operators in their interactions. Four games are formulated, representing different decision making processes, including Nash and Stackelberg (leader-follower) games. The different timings of long-run and short-run decisions are also modeled in a two-stage game. Our results indicate that the market equilibria in the four games formulated are quite different as a result of the different sequences of moves. The highway operator is considered to be in a better position in terms of profit making in most cases, while for the transit operator it will generally be more advantageous to be the follower rather than in the leader position.     

公路路面施工质量研究

多年来，各种公路路面出现了损坏现象，施工队伍对路面基层缺少足够的重视，施工工艺达不到规定的要求，对施工中路面的质量重视程度不够。所以要求具有科学性的路面施工技术，制定科学的施工方案，保证公路的路面施工质量达到标准规定。     

公路桥梁技术状态评估及其养护措施研究

介绍了公路桥梁技术状态评估的方法——综合评估法,对该方法的实施步骤作了论述,并提出了公路桥梁的养护措施,包括公路桥梁养护资金预算、设备投入、完善检测方法等内容,以促进公路桥梁工程的发展。     

山区高速公路小型构造物常见问题及处理方法

总结了山区高速公路小型构造物实施过程中常出现的问题,针对这些问题提出了相应的解决方法,从而使小型构造物设计更加准确、合理、实用,减少对周围环境的影响。     

谈我国高速公路管理现状与改革

基于我国高速公路管理的现状,针对管理中存在的问题进行分析和研究,并结合我国高速公路发展的实际情况提出管理改革的有关建议,从而促进高速公路事业的健康发展。