近场爆炸时预制节段柱的动力响应分析

为研究近场爆炸荷载作用下钢筋混凝土预制节段柱的抗爆性能,基于爆炸基本理论,对近爆作用下预制节段柱的损伤及动力响应进行分析,进一步就不同比例距离、不同节段数量展开参数化研究。结果表明:大当量炸药下,相比于传统的整体式柱,预制节段柱中节段间的滑移、开口可以有效地消耗爆炸能量,从而减轻柱体混凝土的破坏,不会出现贯穿;更多的节段间的相对运动可以消耗更多的爆炸能量,增加墩柱中节段数量可以提高柱的抗爆性能;在车载大当量炸药下,预制节段柱的两端固定端出现剪切破坏,应考虑使用高性能混凝土来建造底部基础段及上部盖梁段。

Cyclic test and numerical study of seismic performance of precast segmental concrete double-columns

The comparative research on the seismic performance of grouted sleeve connected pier(GS)and prestressed precast segmental concrete pier(PC)is mostly carried out by numerical simulation.In this study,the GS pier and the PC pier of the new railway project from Hetian to Ruoqiang are taken into consideration.Two kinds of 1/5-scale assembled double-column specimens are made,and the quasi-static tests are carried out.The overall seismic performance of the two spliced piers is studied,and compared in terms of failure mechanism,bearing capacity,ductility,stiffness and energy dissipation capacity.The results show that the failure modes of both GS pier and PC pier are characterized by bending.However,the specific failure location and form are different.The GS pier presents a complete hysteretic curve,large equivalent stiffness and strong energy dissipation capacity.The hysteretic area of the PC pier is small.However,it has good self-reset ability and quasi-static residual displacement.Finite element models are set up using DispBeamColumn fiber elements and ZeroLength elements.The models that are calibrated with the test data can effectively simulate the damage development under monotonic loading.The load−displacement curves are in good agreement with the backbone curves of the test results.

全装配化多层预制电子厂房的设计实践

介绍了一个全装配化施工的多层电子厂房项目。本项目以设计标准化、部品工厂化和施工装配化为设计导向,按照标准化的原则进行结构设计和预制构件布置,所有结构构件在工厂大批量生产,采用全装配化、免支撑、免支架方式进行施工。在连接设计时按照'整体式'的原则,通过满足标准、图集要求的节点设计实现了'等同现浇'的理念。在满足结构设计要求和安全可靠的前提下,在工期、质量和综合经济成本上取得较好效益。