地下结构穿越道路保通临时钢结构盖板标准化设计与施工技术

地下结构穿越运营道路,引起道路沉降,严重影响行车安全性及舒适性。为道路保通,设置临时钢结构盖板在市政工程中应用广泛。北京市某地铁穿越施工引起道路沉降,因而采取设置临时钢结构盖板措施,以该工程临时钢结构盖板的设计及施工为应用案例,提出了道路沉降钢结构盖板措施标准化的设计与施工技术。经验算,结构的最大应力及最大挠度均符合规范要求,地铁穿越道路引起沉降问题得到有效解决。

Effects of Boundary Conditions on the Design of Anti-Ram Bollards

Anti-ram bollards used in perimeter protection are tested to meet performance requirements of established standards such as the US Department of State Specification SD-STD-02.01. Under these standards, tests are conducted in prescribed conditions that should be representative of the service installation. In actual project, conditions encountered on site may vary from the test environment and it would be expensive and time consuming to validate each deviation with a physical test. High-fidelity physics-based (HFPB) finite element modeling can provide precise simulations of the behavior of anti-ram bollards. This paper presents the use of HFPB finite element modeling, using LS-DYNA, in an actual project to evaluate the performance of an anti-ram bollard design subjected to various boundary conditions representing the physical conditions encountered on site. The study shows that boundary conditions can have a significant influence on the performance of the anti-ram bollards. This suggests that anti-ram bollards must be designed and engineered according to actual conditions that are found on site. It also shows that HFPB modeling can be an effective tool that supplements physical testing of anti-ram bollards.

市政道路保通临时钢便桥标准化设计与施工技术

市政道路钢便桥是为保障施工过程中交通通行而搭设的保通设施,在市政工程中应用广泛。文章以既有道路临时钢便桥结构设计施工为基础,结合北京市海淀区某热力一次管线工程占路竖井临时钢便桥的设计与施工应用,提出市政道路钢便桥标准化的设计与施工技术,最大限度上满足了工程施工的便捷性与道路通行安全舒适性,为市政道路的钢便桥标准化提供参考。