高强度钢材厚板钢结构的焊接技术

高强度钢材厚板钢结构近年来得到了广泛的应用,钢结构施工工艺和方法也有了很大提高。各种高强度、异形复杂截面构件的现场焊接越来越多,焊接难度越来越大,特别是多杆件汇交形成的复杂节点更是加大了钢结构的施工难度;一些超长、超厚焊缝在施工现场进行焊接,对施工技术方面也有着较高的要求。本文以某钢结构工程为例,对Q460GJB高强度钢材厚板钢进行了详细的介绍,结合实际施工案例,介绍高强度钢材Q460GJB工艺流程与焊接方法,以促进高强度钢材厚板钢结构施工技术的应用与发展。

110mm厚高强度结构钢Q690D-Z35的研发

在生产条件下,通过成分设计和轧制、热处理工艺设计,采用晶粒细化、固溶强化、析出强化等手段,得到金相组织为保持马氏体位向的索氏体组织,生产出性能优异的Q690D-Z35高强度钢板。

Structural Behavior of Repaired Reinforced Concrete Beams with Glued Steel Plate and Carbon Fiber

This paper investigates the strength and deformation characteristics of reinforced normal and high-strength concrete rectangular beams which failed in shear and repaired by external bonding of carbon fiber and steel plate. Five simply supported reinforced concrete beams with shear reinforcement are tested, three of which are made with NSC （normal-strength concrete） and the other two with HSC （high-strength concrete）. The span of the simply supported beams is 0.9 m with 100 mm wide by 200 mm deep cross section. All five beams are tested under four-point bending. Careful repair process is adopted and proved successful. The aim is to restore or increase shear strength of these beams and to monitor their post-repair load-deflection behavior. The effect of concrete compressive strength on the behavior and strength of beams before and after repair is also investigated. Shear cracks patterns and their evolution are observed and discussed.