浅谈12缆三维地球物理深水勘探船的舾装设计

介绍了12缆三维地球物理深水勘探船舾装设计的主要特点,分别阐述了常规舾装设备和物探专业设备的技术状态,常规设备主要着重于因作业要求带来的常规设备特殊性布置和物探设备的系统性配备和布置,主要着重于本船的实际作业特点。     

基于震害的多层砌体结构抗震性能评估方法

为快速评估既有砌体结构的抗震性能,基于日本既有建筑抗震评估理论,提出了一种砌体结构抗震性能评估方法.该方法以砌体结构各楼层墙体和构造柱的水平抗侧承载力作为结构抗震能力的指标,通过比较结构抗震能力指标与结构抗震能力需求指标评估砌体结构的抗震性能.通过对汶川地震中大量多层砌体结构房屋震害的分析,获得了遭遇地震烈度9,10度的结构抗震能力需求指标.结果表明,该方法能快速评估砌体结构的抗震性能,估计其震害程度.     

LCA与汽车开发协同路径研究——以客车轻量化为例

为探究汽车生态协同设计,将生命周期评价(Life Cycle Assessment,LCA)与汽车产品开发相结合,提出串行开发和并行开发两种协同路径。以12 m纯电动客车底架的轻量化开发为例,研究了串行开发方案下客车底架轻量化对我国资源、能源和环境的影响。结果表明,与原客车底架相比,结构优化后客车底架质量减轻52.5 kg,且经校验轻量化后客车底架的刚度、强度及固有动态特性均满足要求;对于全生命周期而言,轻量化后其矿产资源消耗减少0.4×10^-4kg Sb eq.,化石能源消耗减少0.7×10⁴MJ,综合环境影响值减少0.42×10-11,降低比例分别为3.81%、4.46%和4.56%。未来将在本研究的基础上进行并行开发方案的协同探索,并对研究结果进行比较分析。     

Validation of earthquake analysis methodology of a suction-caisson foundation-structure through model testing

Suction caissons are one of the most widely used foundation solutions for subsea structures and wind farms. Seismic response of subsea structures is however seldom documented properly, often just treated as a foundation capacity issue applying a quasi-static acceleration and not considering the inertial interaction between the structure and the soil. The more relevant tasks to document are the motions of the unit and the response of the externally connected flowlines and equipment/systems on the unit.Based on a case study located in the Shah Deniz field in the Caspian Sea, model centrifuge tests and numerical modelling were carried out to validate the global response of a 4-caisson supported manifold structure subject to seismic motions in soft clay. The centrifuge tests were carried out at 58 g at the centre for geotechnical modelling at UC Davis. To simulate the soil-structure interaction, a series of non-linear springs defined by kinematic hardening models were used in analyses with the ABAQUS software. This development includes the algorithms for determining the required model parameters. A very good agreement between recorded response from the centrifuge test and calculated response from the FE-analyses was achieved.The development and validation of the soil model presented in this paper is an improvement in design methodology for caisson foundations subjected to earthquake loading. The non-linear soil springs are well suited to incorporate in more detailed structural analyses where an accurate representation of the foundation response is required. The paper also briefly describes how the subsequent earthquake design analyses were performed for the Shah Deniz manifold structures making use of the validated soil spring model and the added value it gave to the project.